JP3964543B2

JP3964543B2 - Optical fiber connection method, transmitter or receiver, and optical fiber system

Info

Publication number: JP3964543B2
Application number: JP16586898A
Authority: JP
Inventors: ディヴィド・エルババウム
Original assignee: エルベックスビデオ株式会社
Priority date: 1998-06-01
Filing date: 1998-06-01
Publication date: 2007-08-22
Anticipated expiration: 2018-06-01
Also published as: JPH11346319A

Description

【０００１】
【発明の属する技術分野】
この発明は、遠隔配置された送信機から伝搬した情報信号を搬送する光ファイバ線路に外部同期信号及び制御信号を注入し、この注入された信号を同一の光ファイバ伝送線路を介して情報信号の伝搬とは逆方向で上記送信機に送信する光ファイバの接続方法および送信装置又は受信装置並びに光ファイバシステムに関する。
【０００２】
【従来の技術】
情報伝送システムとして使用する閉回路テレビジョン（ＴＶ）システムにあっては、１台または複数のＴＶカメラが単一または多数の伝送線路を介して監視局に接続される。これらのＴＶカメラは、そのパン、チルトあるいはズームレンズ用遠隔制御式位置調整装置を含むことがある。また、このカメラは、ワイパ、ウオッシャ、ヒータ、イルミネータなどの遠隔制御式機能を備え、監視局から発せられた制御命令によって遠隔設定される各種の回路を有することもある。
【０００３】
種々のカメラ機能遠隔制御方法として、多重制御ケーブルを介するＡＣまたはＤＣ制御を採用するものがあり、撚り線（twisted pair wires）または光ファイバケーブルを介して伝送されるディジタルコマンドコードを採用するものもある。さらに、情報信号を搬送するビデオ同軸ケーブルを介してＴＶカメラに制御コマンドコードを伝送する他の方法が米国特許第４，９８９，０８５号、同第５，３３５，０１４号および同第５，５７９，０６０号に開示されており、その内容をここに参照して本書に含める。
【０００４】
複数のＴＶカメラを複数の伝送線路を介して監視局に接続する場合、この伝送線路はＴＶモニタにカメラを選択的に表示するための切替器に接続される。閉回路ＴＶシステムがそのＴＶカメラのための外部同期を採用しない場合、モニタに表示される選択画像は１のＴＶカメラから他のＴＶカメラへの切り替え時、或いはその直後に妨害を受ける。従って、カメラからカメラへの完璧な切り替えを実行し、切り替え時およびその直後の表示画像に障害がないようにするため、上記システムの全てのＴＶカメラを外部的に同期させるのが望ましい。
【０００５】
複数のＴＶカメラを同期させる装置の１つとして、垂直同期信号および水平同期信号或いはＴＶシステムに用いられる複合同期信号を送信する装置が広く知られている。また、垂直駆動信号および水平駆動信号を送信し、送信された垂直および水平駆動信号によってＴＶカメラおよびその偏向／タイミング回路を駆動する装置も広く知られている。
【０００６】
上記のような従来型装置にあっては、伝送された同期信号自体もノイズの影響を受け易いパルス行列であるため、同期信号の伝送には、遮蔽効果の高い専用同軸ケーブル、或いは特に複数のＴＶカメラを備えるシステムを複雑にし、そのコストを押し上げる専用光ファイバケーブルの使用が必要となる。
【０００７】
複数のＴＶカメラを同期させるもう１つの方法および装置として、外部同期信号をビデオ信号伝送線路に注入し、伝送された外部同期信号を介してＴＶカメラの内部同期信号発生器を鎖錠（ロック）することにより外部同期信号発生器からＴＶカメラに外部同期信号を伝送する方法および装置が知られている。このよな装置は米国特許第４、６０３、３５２号に開示されており、その内容をここに引用して本書に含める。
【０００８】
ビデオ信号の伝搬に用いられるいくつかの光ファイバ伝送線路は、ビデオ伝搬とは逆方向の外部同期信号或いはディジタル制御信号などの双方向信号の伝送にも使用されるが、これらの光ファイバ伝送線路を動作させる装置は、その光ファイバ線路の両端に、供給された外部同期信号或いは制御信号のための専用入出力ターミナルを必要とし、これらは光ファイバ伝送線路の両端のビデオ入出力ターミナルに追加されるものである。従って、前述のようなビデオ同軸ケーブルを介して外部同期信号および制御信号を供給する方法および装置は上記光ファイバ伝送線路に適用できない。
【０００９】
【発明が解決しようとする課題】
本発明の目的は、双方向信号、即ち、送信機からの１方向の情報信号および送信機への反対方向の外部同期信号及び／又は制御信号を搬送する同軸ケーブル或いは撚り線などの伝送線路を、双方向信号用共通ターミナルを介して光ファイバ線路のファイバ送信機に接続することである。
【００１０】
本書で使用する “光ファイバ線路”なる用語は、両端に双方向光ファイバトランシーバが接続された単一の光ファイバケーブルを意味し、光ファイバケーブルを送信機に接続するものを“ファイバ送信機”と呼び、光ファイバケーブルを受信機に接続するものを“ファイバ受信機”と呼ぶ。
【００１１】
本発明のもう１つの目的は、双方向信号、即ち、受信制御器からの１方向外部同期信号及び／又は制御信号および受信制御器への反対方向の情報信号を搬送する同軸ケーブル或は撚り線などの伝送線路を、双方向信号用共通ターミナルを介して光ファイバ線路のファイバ受信機に接続することである。
【００１２】
本発明の更に別の目的は、同軸ケーブル若しくは撚り線などの伝送線路の２つの部分間に光ファイバ線路を導入、接続し、一方の部分を送信機に、もう一方の部分を受信制御器にそれぞれ接続し、伝送線路の両部分が双方向信号、即ち、受信機への１方向の情報信号および送信機へに対する逆方向の外部同期信号及び／又は制御信号を搬送するようにし、もって光ファイバ線路の各端部が双方向信号用共通ターミナルを介して１本の伝送線路に接続されるようにすることである。
【００１３】
本発明によれば、光ファイバ線路は、同軸ケーブル或は撚り線などの情報伝送線路に接続されると、同軸ケーブル若しくは撚り線と同じように双方向信号を伝搬する。
【００１４】
本発明の更にもう１つの目的は、光ファイバケーブルの一端を送信機に、他端を受信制御器に直接的に接続し、双方向信号、即ち、送信機から受信制御器への情報信号および受信制御器から送信機への外部同期信号及び／又は制御信号を伝搬させることである。
【００１５】
【課題を解決するための手段】
双方向信号を搬送する情報伝送線路に光ファイバ線路を接続する方法は、信号レベル及び／又は信号タイミングに基づいてファイバ受信機の出力コネクタに介在する複合信号から外部同期信号及び／又は制御信号を分離し、ファイバ受信機の光ファイバコネクタに光学信号を供給する駆動回路に分離された信号を再注入する工程を含む。これに引き続き、ファイバ送信機の光ファイバコネクタから外部同期及び／又は制御信号を抽出し、抽出された外部同期及び／又は制御信号をファイバ送信機の入力コネクタに再注入する工程が含まれ、これにより、ファイバ受信機出力コネクタからファイバ送信機入力コネクタへの外部同期信号及び／又は制御信号の転送が実行される。
【００１６】
本発明による装置は、１本又はそれ以上の情報伝送線路或は光ファイバ線路に接続されて１つ又はそれ以上の受信手段にビデオ信号を供給する、１台又はそれ以上のＴＶカメラなどのビデオ信号発生手段を含む。各ビデオ信号発生手段は、外部同期信号と同期した内部同期信号を発生する内部同期信号発生回路を有する。
【００１７】
本発明によれば、外部同期信号は、ビデオ信号の最大電圧レベルよりも高い或は最小電圧レベルよりも低い電圧レベルを有するパルス信号である。受信手段は、ビデオ信号発生手段に接続された情報伝送線路若しくは光ファイバ線路に外部同期信号を注入する回路を有する。各ビデオ信号発生手段は、外部同期パルス信号の信号レベルを所定電圧の基準信号と比較することによって外部同期信号を抽出するレベル比較回路を有し、抽出された外部同期信号を内部同期信号発生回路に供給する。外部同期パルスがビデオ信号の帰線消去期間中に生成されるため、外部同期信号はビデオ信号に影響を与えることなくビデオ信号の伝送に用いられるのと共通の伝送線路を介して伝送できる。
【００１８】
実施形態において、各ビデオ信号発生手段は、好ましくは、対応する情報伝送線路又は光ファイバ線路を介して受信手段に供給された出力信号から外部同期信号を除去する回路を含む。これにより、情報伝送線路或は光ファイバ線路を介して伝送されたビデオ信号から外部同期信号が除去できるので、外部同期信号が受信手段入力回路に影響を与えることはなく、ビデオ信号が無しで受信できる。
【００１９】
実施形態において、各ビデオ信号発生手段は、更に、各ビデオ信号発生手段に割り当てられる識別番号に対応する識別コード信号を発生し、この識別コード信号を受信手段に供給されたビデオ信号に注入する識別コード発生回路を含んでいてもよい。
【００２０】
受信手段は、更に、受信信号から識別コード信号を抽出する識別コード信号処理手段を含んでいてもよい。
【００２１】
識別コード信号処理手段は、好ましくは、各割当コード番号の識別データを記憶するためのメモリと、受信信号から識別コード信号を抽出し、抽出した識別コード信号を復号することにより復号信号を発生する抽出回路と、メモリから復号信号の識別データを読み出し、読み出した識別データをビデオ信号に重ね合わせる制御器を有する。これにより、受信したビデオ信号は、ビデオ信号を送信しているビデオ発生手段を照合する識別コード信号処理手段によって識別され、もってビデオ発生手段の無エラー制御の基盤が提供される。
【００２２】
本発明の装置は、更に、ビデオ信号発生手段を制御するため、抽出回路によって復号され、供給された、識別コード信号とともに符号化制御コマンドを混合する制御信号を発生し、供給する制御手段を含む。符号化制御コマンドは、制御信号に混合された識別コード信号が制御中のビデオ信号発生手段に割り当てた識別番号と一致するときだけビデオ信号発生手段を動作させるためビデオ信号発生手段に供給される。これにより、制御処理時に制御手段によって抽出され、復号された識別コードを有する特定のビデオ信号発生手段だけがその割当識別番号を制御手段から供給された制御信号から抽出された識別コードと一致させることができる。従って、どの特定ビデオ信号発生手段も認証でき、適正に制御できる。
【００２３】
制御信号は、ビデオ信号の垂直帰線消去期間中にビデオ信号発生手段を受信手段に接続する情報伝送線路或は光ファイバ線路に注入される。ビデオ信号発生手段は、更に、情報伝送線路或は光ファイバ線路から制御信号を抽出し、制御信号に混合された識別コード信号がその割当識別コードと一致するときだけ抽出した制御信号を供給する制御信号処理手段を含んでいてもよい。制御信号は、ビデオ信号の帰線消去期間中に送信されるため、ビデオ信号を妨害することなく共通伝送線路を介して受信手段からビデオ信号発生手段に送信することができる。
【００２４】
各ビデオ信号発生手段は、好ましくは、ビデオ信号にオーディオ信号を注入することにより、ビデオ信号とオーディオ信号とで構成される混合信号を生々し、この混合信号を対応する情報伝送線路或は光ファイバ線路に供給する信号混合手段を更に含む。これにより、混合されたビデオ信号およびオーディオ信号は、共通の情報伝送線路或は光ファイバ線路を介してビデオ発生手段と受信手段との間に送信される。
【００２５】
受信手段は、混合信号からオーディオ信号を抽出することによってオーディオ信号を出力するオーディオ信号読み出し手段を更に含んでいてもよい。
【００２６】
受信手段は、情報伝送線路或は光ファイバ線路のいずれかにビデオ信号の伝搬方向とは逆方向の制御信号を供給する御信号ドライバを更に含んでもよい。各ビデオ発生手段は、好ましくは、情報伝送線路若しくは光ファイバ線路から制御信号を抽出し、抽出した制御信号をビデオ発生手段の駆動回路に供給してカメラ又はそのレンズのための遠隔位置決め装置などの周辺機器を作動する制御信号抽出器を更に含んでもよい。
【００２７】
【発明の実施の形態】
図１は、本発明の好適実施形態としての情報伝送システム１における光ファイバ線路を接続する装置であり、モニタシステムなどの専用閉回路テレビジョン（ＴＶ）システムに適用した例を示している。閉回路ＴＶシステム内の情報信号にはビデオ信号が含まれ、以下の説明において、ビデオ信号は、複合ビデオ信号、デジタルビデオ信号、多重ビデオ及びオーディオ信号、或は、多重ビデオ及びデータ信号、多重ビデオ、オーディオ及びデータ信号であってもよい。
【００２８】
図１において、情報伝送システム１は、伝送線路１６Ｔを介してビデオ信号をファイバ送信機６に送信するＴＶカメラ１０を含む。ファイバ送信機６は、光ファイバケーブル１５を介してビデオ信号を受信制御器１１に出力する。受信制御器１１は、ビデオ信号を受信してＴＶカメラ１０を外部的に同期させ及び／又は制御するための外部同期信号及び／又は制御信号を生成して光ファイバケーブル１５を介してファイバ送信機６に供給する。ここから外部同期信号及び／又は制御信号は伝送線路１６Ｔに注入され、ＴＶカメラ１０を外部的に同期させ及び／又は制御する。
【００２９】
図１に示されるように、光ファイバケーブル１５を接続する１７と、伝送線路１６Ｔを接続する１８の２つのコネクタは、光ファイバケーブル１５及び伝送線路１６Ｔを介して伝搬する双方向信号の共通コネクタである。同様に、図２において、光ファイバケーブル１５を接続する２７と、伝送線路１６Ｒを接続する２８の２つのコネクタは、双方向信号、即ち、受信制御器９に供給される１方向のビデオ信号と、ＴＶＴＶカメラへの逆方向の外部同期及び／又は制御信号の共通コネクタである。
【００３０】
図２を参照するに、情報伝送システム２は、光ファイバケーブル１５を介してビデオ信号をファイバ受信機８に送信するＴＶカメラ１２を含む。ファイバ受信機８は、伝送線路１６Ｒを介して受信制御器９にビデオ信号を出力する。受信制御器９は、ビデオ信号を受信し、ＴＶカメラ１２を外部で同期させ及び／又は制御するための外部同期信号及び／又は制御信号を生成して伝送線路１６Ｒを介してファイバ受信機８に供給する。これから外部同期信号及び／又は制御信号は光ファイバケーブル１５に注入され、ＴＶカメラ１２に供給される。
【００３１】
図１の受信制御器１１は、光ファイバコネクタ２７を介して光ファイバケーブル１５に直接接続されており、図２のＴＶカメラ１２は、光ファイバコネクタ１７を介して光ファイバケーブル１５に接続されている。受信制御器１１は、内蔵のファイバ受信機を含み、同様にＴＶカメラ１２は内蔵のファイバ送信機を含む。従って、図１の情報伝送システム１に別個のファイバ受信機は不要であり、図２の情報伝送システム２に別個のファイバ送信機は必要とされない。
【００３２】
図３は、別の好適実施形態としての情報伝送システム３を示しており、光ファイバケーブル１５によって連結されたファイバ受信機８およびファイバ送信機６は、伝送線路の２つの部分１６Ｒ、１６Ｔ間に設けられている。従って、ＴＶカメラ１０及び受信制御器９は、撚り線伝送線路の接続に用いられる従来の同軸ケーブルコネクタ或はターミナルなどの伝送線路コネクタ１６を採用している。
【００３３】
図４は、情報伝送システム４を示し、ＴＶカメラ１２と受信制御器１１は、それぞれファイバ送信機及びファイバ受信機を有しており、従って光ファイバコネクタ１７を通ってカメラへ向かう信号及び光ファイバコネクタ１８を通って受信制御器へ向かう信号の双方向信号の伝搬用光ファイバケーブル１５によって直接接続されている。
【００３４】
図５は、本発明の更なる別の好適実施形態としての情報伝送システム５を示す。複数のＴＶカメラ１０及び１２は、複数の伝送線路１６Ｒ又は光ファイバケーブル１５を介して受信制御器及びセレクタ９０に接続されている。多数のカメラ１０及び１２を受信制御器及びセレクタ９０に接続する伝送線路或は光ファイバ線路の各々は、図１乃至図４の情報伝送システム１、２，３又は４が双方向信号を伝搬させるのと全く同様に双方向信号を伝搬する。
【００３５】
図７は、外部同期パルスＰ１をバッファ回路３６に供給する周知の外部同期発生器４４を内蔵する受信制御器９を示す。バッファ回路３６はビデオ線路１６Ｌ及びコネクタ１６へ外部同期パルスＰ１を注入する。
【００３６】
外部同期信号Ｐ１の周波数は、フレーム又はフィールド走査周波数を有する、ＴＶカメラ１０又は１２によって生成されたビデオ信号の垂直周波数に関連している。例えばＮＴＳＣシステムの場合、フレーム周波数は３０Ｈｚであり、フィールド周波数は６０Ｈｚである。この場合、外部同期パルスＰ１の周波数は、３０Ｈｚのフレーム周波数か、６０Ｈｚのフィールド周波数のいずれかである。
【００３７】
図６の（Ａ）に示されるように、外部同期信号Ｐ１が発生する時間は、垂直同期パルスに隣接しており、ＴＶカメラ１０或は１２から伝送されるビデオ信号の垂直帰線消去期間中に発生する。この結果、外部同期信号Ｐ１は、ビデオ信号に影響を与えることなくビデオ信号を搬送する共通伝送線路１６Ｒを介してＴＶカメラ１０又は１２に伝搬される。外部同期信号Ｐ１の電圧レベルは、好ましくはビデオ信号の白色レベルＶｗより高くする。しかし、外部同期信号Ｐ１の電圧レベルは、ビデオ信号の最小レベルより低くてもよい。
【００３８】
以下の説明において、ビデオ信号の白色レベルより高い電圧レベルを有するフレーム外部同期パルス、特に、第２フィールドの位相に対応するフレーム外部同期パルスを外部同期信号Ｐ１として使用する。
【００３９】
図示実施形態において、各ＴＶカメラ１０或は１２は、外部同期信号Ｐ１と同期して動作するＴＶカメラである。このＴＶカメラとしては、米国特許第４，６０３，３５２号に開示されるようなビデオ信号のレベルよりも高い（又は低い）電圧レベルを有する外部同期信号と同期させて使用する周知のものが使用される。
【００４０】
各ＴＶカメラ１０、１２は、１、２、３・・・・ｎなどの数字若しくは文字で構成される識別（ＩＤ）コードを生成し、垂直帰線消去期間中にビデオ信号に注入する。
【００４１】
各ＴＶカメラ１０或は１２は、識別コードに対応するコード信号を発生させる回路と、コード信号がビデオ信号に注入された複合信号を発生させる回路を有する。このような装置は、米国特許第 4,603,352 号に開示され、その内容をここに参照して本書に含める。従って、受信制御器９、１１或は９０によって受信される各情報信号は識別コードを含む。
【００４２】
図７に示されるように、受信制御器９の外部同期発生器４４は、この外部同期発生器４４から供給される外部同期信号Ｐ１と同期する図６の（Ｂ）に示されるパルス信号Ｐ２を提供する。外部同期信号を注入するバッファ回路３６がパルス信号Ｐ１を受信してビデオ信号伝送線路１６Ｌに注入するのに対し、パルス信号Ｐ２は、同期パルスクリッピング回路３８を通過するビデオ信号伝送線路１６Ｌから供給された信号から同期パルスＰ１のクリッピングを行う同期パルスクリッピング回路３８に供給され、同期パルスを含まないビデオ信号を出力コネクタ４１に供給する。
【００４３】
同期パルスクリッピング回路３８には、ビデオ信号伝送線路１６Ｌからの図６の（Ａ）の信号と、外部同期発生器４４からの図６の（Ｂ）のタイミング信号Ｐ２とが供給される。信号Ｐ２は、その継続期間中にクリッピング回路を起動し、もってクリッピング回路３８は、信号Ｐ２の期間中にビデオ信号の黒レベルＶｂ上の、クリッピング回路の入力端子に供給される信号の全信号部分をクリッピングする。Ｐ２の継続期間が外部同期信号Ｐ１の周期を含むので、外部同期信号Ｐ１は、図６の（Ｃ）に示されるように出力コネクタ４１に供給される複合ビデオ信号からクリッピング回路３８により取り除かれる。
【００４４】
従って、外部同期信号Ｐ１は、ＴＶカメラ１０或は１２から伝送線路１６Ｌを介して供給されるビデオ信号に含まれていても、クリッピング回路３８によって取り除かれる。この結果、ビデオ信号伝送線路１６Ｌに注入された外部同期信号Ｐ１は、ＴＶカメラ１０或は１２を同期させ、出力コネクタ４１に接続された表示装置で受信エラーを起こすことはない。
【００４５】
ＴＶカメラ１０或は１２がオーディオ信号を発生させるとき、この信号は、ＴＶカメラ１０或は１２の内部でビデオ信号と多重化され、その多重化された信号は、伝送線路１６Ｔを介してファイバ送信機６に供給される。ファイバ送信機６は、伝送線路１６Ｒを介して受信制御器９、１１又は９０に多重化信号を供給するファイバ受信機８に光ファイバケーブル１５を介して多重ビデオ信号を供給する。混合されたビデオ信号及びオーディオ信号は、次いで、クリッピング回路３８の出力端子からオーディオデコーダ４２に供給される。オーディオデコーダ４２は、復号オーディオ信号をオーディオ出力コネクタ４２Ａを介して出力する。
【００４６】
受信制御器９は、対応するＴＶカメラ１０或は１２を制御するための制御信号を生成する制御信号発生器４９を含む。制御信号発生器４９は、ビデオ線路１６Ｌを介して伝搬されるビデオ信号から水平及び垂直同期信号Ｈ、Ｖを分離する同期分離回路４６を有する。また制御信号発生器４９は、分離された同期信号Ｈ及びＶに基づいて、対応するＴＶカメラ１０或は１２を所定のタイミング時にだけ動作させる制御信号を出力する制御信号発生回路５０を含む。カウンタ５２は、同期分離器４６から供給された水平走査線数を各フレーム或はフィールド期間中に数えるために設けられている。また、制御信号発生器４９は、カウンタ５２によって数えられた値が所定値であるときにゲート信号を生成するゲート回路５４と、制御信号発生回路５０から供給される制御信号をビデオ線路１６Ｌに注入するバッファ５６とを有する。
【００４７】
本発明の好適実施形態において、注入回路はミクサ回路を有し、この回路で複数のコード信号を混合し、複合ビデオ信号に注入するようにしてもよい。このようなミクサ回路は米国特許第 4,989,085 号に示されており、その内容を参照して本書に含める。また、米国特許第 5,335,014 号に開示され注入回路であってもよく、その内容を参照して本書に含める。
【００４８】
制御コマンドコードをカメラ１０又は１２に伝搬するためビデオ線路１６Ｌを介して供給される制御コマンドは、電源のオン／オフ、ワイパのオン／オフ、チルティング（tilting）のアップ／ダウン、パンニングの左／右、及びズーミングのテレ／ワイド等を切り替える制御コード、或はビデオ信号伝送の開始／停止コマンドを含んでもよい。制御信号は、制御コマンドに対応する制御コードと、ＴＶカメラ１０又は１２にそれぞれ割り当てられる識別コードを合成してもよい。更に、制御信号は、垂直帰線消去期間中の所定時間に図７のバッファ回路５６によってビデオ線路１６Ｌに注入される。ビデオ線路１６Ｌへの制御信号の注入タイミングは、ビデオ線路１６Ｌへの外部同期信号の注入タイミングとは異なる。
【００４９】
上記から明らかなように、外部同期信号及び制御信号は、受信機９から伝送線路１６Ｒを介してＴＶカメラへ送信される。
【００５０】
図９に示されるように、各ＴＶカメラ１は、電圧比較器６２に基準信号或は電圧を供給する基準源６０を有し、電圧比較器６２は、伝送線路１６Ｔを介して伝送装置から伝送される外部同期信号Ｐ１の電圧レベルと基準信号或は電圧とを比較し、Ｐ１のレベルが基準信号或は電圧と同じ又はそれ以上であるときにパルス信号Ｐ３を発生することにより、外部同期パルスを分離する。内部同期信号発生回路６４は、電圧比較器６２から供給されるパルス信号Ｐ３と同期する内部同期信号Ｈ及びＶを生成し、ビデオ信号発生回路６６は、内部同期信号Ｈ及びＶと同期するビデオ信号を発生し、その同期したビデオ信号を伝送線路１６Ｔに供給する。オーディオ信号発生回路６８は、ビデオ信号とともにオーディオ信号を生成し、オーディオ信号注入回路７０は、オーディオ信号をビデオ線路１６Ｌに注入してオーディオ信号とビデオ信号とを混合する。
【００５１】
図９に示されるように、各ＴＶカメラ１０は、内部同期信号Ｈ及びＶに基づいて複合ビデオ信号の垂直帰線消去期間の所定時間にＴＶカメラ１０に割当てられる識別コードを生成する識別コード設定回路７２と、その設定回路７２から供給される識別コードをビデオ線路１６Ｌに注入する識別コード注入回路７４とを有してもよい。
【００５２】
識別コードが注入回路７４によって伝送線路１６Ｔに注入されるタイミングは、制御信号が図３に示されるように受信制御器９によって伝送線路１６Ｒに注入されるタイミングとは異なる。制御信号は、複合ビデオ信号の垂直帰線消去期間中の１以上の所定水平走査線中に受信制御器９によって伝送線路１６Ｒに注入される。これに対して、識別コードは、複合ビデオ信号の同じ或は別の垂直帰線消去期間中の１以上の別個の所定水平走査線中にＴＶカメラ１０によって伝送線路１６Ｔに注入される。
【００５３】
識別コード信号は図１１の（Ａ）乃至（Ｃ）に示されている。この識別コード信号は、ビデオ信号中の画像信号の最大或は最高レベルである高レベル或は白と、画像信号の最低レベルである低レベル或は黒と、図１１（Ａ）のようにＴＶカメラ１によって生成されたビデオ信号中の画像信号の中間レベルである中レベル或はグレーとで構成される２つ以上のレベルを有するバイナリコード又はバーコード信号である。識別コードは、図１１の（Ｂ）のように、パルス信号レベルと可変パルス幅の組み合わせであってもよい。
【００５４】
代替的に、識別コード信号は、識別コード信号に対応する周波数を有するパルス信号或は正弦波信号でもよく、正弦波信号又は識別コード信号は、図１１の（Ｃ）に示されるように１以上の水平走査期間中、好ましくは垂直帰線消去期間中に発生する。
【００５５】
図７の制御信号発生器５０は、図１１の（Ａ）乃至（Ｃ）の識別コード信号に類似する電子成形信号としての制御コード信号を生成する。しかし、別途成形した電気信号を制御コード信号及び識別コード信号に適用してもよい。同様に、制御信号に含まれる識別コードは、図９のＴＶカメラの識別設定回路７２によって生成される識別コードと同一である必要はない。同一識別コードの代りに、各ＴＶカメラに割当てられたＩＤに相当するコードを使用してもよい。図７の制御信号発生器５０は、周知の電話ダイヤルトーンを生成してもよく、１以上のフィールド期間の実時間オーディオを１以上の水平周期に圧縮するオーディオ圧縮回路で構成してもよい。
【００５６】
図９のＴＶカメラ１０は、図７の制御信号発生回路５０によって生成された識別コード及び制御コードを抽出するコード抽出回路７６と、抽出した識別コードを設定回路７２から供給された識別コードと比較し、両コードが互いに対応する際にデコーダ８０に一致信号を供給する識別コード比較回路７８と、コード抽出回路７６から供給された制御コードを復号し、識別コード比較器７８から一致信号を供給されたときだけ復号制御コードに対応する制御コマンドを発生するデコーダ８０と、を有している。
【００５７】
図１２のコード抽出回路７６は、ビデオ信号の全フィールド或はフレーム期間中に水平同期パルス数を数えるカウンタ８４と、カウンタ８４のカウント値が所定値のときにビデオ線路１６Ｌから供給されるビデオ信号を出力するためカウンタ８４の出力側に接続されたゲート回路８６と、信号レベルを検出或はゲート回路８６から供給される信号の包絡線を検出し、伝送線路１６Ｔから供給されるビデオ信号から抽出されたコード信号を再生、出力するレベルセンサ８８とを含む。
【００５８】
コード比較回路７８は、コード抽出回路７６から供給された抽出コードが設定回路７２で設定されたコードに対応若しくは相当するときマッチ（一致）信号を生成し、コード抽出回路７６から供給された抽出コードが設定回路７２で設定されたコードに対応若しくは相当しないときにはミスマッチ（不一致）信号を生成する。
【００５９】
コード比較回路７８は、抽出回路７６から供給された抽出コードが設定回路７２に設定されたコードと対応若しくは一致する場合に一致（マッチ）信号を発生し、抽出回路７６から供給される抽出コードが設定回路７２に設定されたコードと対応或は一致しない場合に不一致（ミスマッチ）信号を発生する。
【００６０】
図１１の（Ｃ）の信号波形を有する識別コード及び制御コードを使用する際、図１２、図１３及び図１４のレベルセンサ回路８８は、ゲート回路８６から供給されるパルス数或は周波数をカウントするパルス又は周波数カウンタを含んでもよい。生成された制御信号が周知のダイヤルトーン信号或は圧縮オーディオ信号の場合、レベルセンサ回路８８は、周知のダイヤルトーンデコーダ或は周知のオーディオ解凍（復元）回路を更に備えてもよい。
【００６１】
図９のデコーダ８０は、異なる制御コマンドを異なるドライバ（図示せず）に供給し、電源のオン／オフ、ワイパのオン／オフ、上下チルティング、左右パンニング、望遠／広角のズーミング、遠近フォーカス、絞り開閉等を指令することにより、或はビデオ信号送信の開始又は停止を指令することによってＴＶカメラ１０を作動させる。
【００６２】
コード設定回路７２は、パン／チルトヘッドの位置決めなどの周辺状態データの一部を形成するセンサ及びスイッチからのデータの供給を受け、制御コマンドの実行に関するコード、或は周辺状態若しくはいずれかのカメラの内部回路の動作状態に関する診断コードを生成する。制御コマンド実行確認コード、状態或は診断コードは、垂直帰線消去の期間中に所定水平線路のコード挿入器７４を介してビデオ線路１６Ｌに注入される。
【００６３】
制御コマンド実行コード、状態及び診断コードをビデオ線路１６Ｌに注入するタイミングは、識別コードの注入のタイミングとも、図７の受信制御器９によって生成される制御信号若しくは外部同期信号の注入タイミングとも異なる。例えば、同期信号は、垂直帰線消去の期間の最初の水平線の開始時に注入され、識別コードは、垂直帰線消去の期間の１２番目の水平線の間に注入され、制御信号および状態診断コードは、それぞれ垂直帰線消去期間中の１４及び１５番目の水平線と１７番目の水平線の間に注入される。
【００６４】
従って、ビデオ及びオーディオ信号、状態及び／又は診断コード信号並びに各ＴＶカメラ１０又は１２に付与された識別コードで構成される多重信号は、ＴＶカメラ１０からビデオ信号伝送線路１６Ｔを介して受信制御器９に送信される。
【００６５】
図１５に示されるように、ファイバ送信機６は、周知の発光ダイオード若しくはレーザ３３と、フォトトランジスタ又はピンダイオード３１と、光路を発光ダイオード３３およびピンダイオード３１に向けるプリズム或は光ファイバケーブルスプリッタなどの周知の光分割器を採用する光ファイバコネクタ１７に光学的に接続されたフィルタ３０とから成り、もって光ファイバコネクタ１７を介する周知の双方向光信号伝搬を実現。発光ダイオード３３は、ピンダイオードの受信波長と異なる波長を有する光信号を発生する。発光ダイオードは、例えば１３００ｎｍ或は１５５０ｎｍの波長を有する光信号を発生し、ピンダイオード受信波長は８５０ｎｍである。
【００６６】
フィルタ３０は、ピンダイオード３１の波長に相当する波長を有する光信号が通過する光学フィルタであるので、受信制御器９、１１、９０から伝搬する制御及び外部同期信号のみがピンダイオード３１に到達し、浮遊（stray）若しくは反射（return）ビデオ信号によって外部同期及び／又は制御信号が干渉されることはない。
【００６７】
上記に代え、２つの別個の光ファイバコネクタ１７を介して２つの単方向光ファイバケーブルを採用し、一方のコネクタ１７が発光ダイオード３３から光信号を直接受信し、他方の光ファイバコネクタ１７が光信号をピンダイオード３１に直接供給するようにしてもよい。この構成の場合、光学分割器及びフィルタ３０は必要なく、両信号の波長は同じでよい。
【００６８】
コネクタ１を介し伝送線路１６Ｔを通って供給されたビデオ信号は、制御信号クリッパ３５及び外部同期信号クリッパ２５を通過し、ビデオ駆動信号を発光ダイオード３３に供給するビデオドライバ３４に達する。
【００６９】
ビデオドライバ３４は、アナログビデオ駆動信号を処理する、或は発光ダイオード３３を駆動するためビデオ信号を振幅変調（ＡＭ）又は周波数変調（ＦＭ）ビデオ駆動信号に変換する公知の光ファイバビデオドライバである。しかし、ビデオ信号と合成されて伝送線路１６Ｒ及び１６Ｔを介して伝搬した外部同期信号のレベルがビデオ信号のレベルより高いとき、ビデオドライバ３４の入力側に外部同期信号が含まれるとアナログ信号駆動エラーが発生すし、ビデオドライバ３４が周波数モジュレータを採用する場合は周波数変調エラーが発生して光信号を過剰駆動する或は歪めてしまう。従って、ビデオドライバ３４に供給されるビデオ信号から外部同期信号を取り除くのが好ましい。後段で説明するが、閉信号ループを防止するためにも外部同期信号を除去するのが望ましい。
【００７０】
図１６に示されるファイバ受信機８は、周知の発光ダイオード若しくはレーザ２３と、フォトトランジスタ若しくはピンダイオード２１と、光路を発光ダイオード２３およびピンダイオード２１に向ける、プリズム若しくは光ファイバケーブルスプリッタなどの周知の光分割器を採用する光ファイバコネクタ１５に光学的に接続されたフィルタ２０と、から成り、もって光ファイバコネクタ１５を介する周知の双方向光信号伝搬が実現される。発光ダイオード２３は、ピンダイオードの受信波長と異なる波長を有する光信号を発生する。このダイオードは、例えば、８５０ｎｍの波長を有する光信号を発生し、ピンダイオード受信波長は、１３００ｎｍ或は１５５０ｎｍでもよい。
【００７１】
フィルタ２０は、ピンダイオード２１の波長に等しい波長の光信号が通過する光学フィルタであるので、ＴＶカメラ１０或は１２から伝搬するビデオ信号のみがピンダイオード２１に達し、ビデオ信号が外部同期及び／又は制御信号の浮遊或は反射により干渉を受けることはない。
【００７２】
上記の代わりに、２つの別個の光ファイバコネクタ１５を介する２本の単方向光ファイバケーブルを採用し、一方の光ファイバコネクタ１５が光信号をピンダイオード２１に供給し、他方のコネクタ１５が発光ダイオード２３から光信号を直接受信するようにすることもできる。この構成において、光学分割器及びフィルタ２０は必要とされず、両信号の波長を同じにすればよい。
【００７３】
好適実施形態の説明が単一の光ファイバケーブル中を伝搬する双方向光信号に関連しており、ファイバ送信機およびファイバ受信機における双方向信号の波長が相反的でなければならないため、以下の説明において、１３００ｎｍの波長がビデオ光信号に使用され、８５０ｎｍの光信号波長が外部同期及び／又は制御信号に使用される。
【００７４】
従って、以下の説明において、発光ダイオード３３、フィルタ２０及びピンダイオード２１は、全て１３００ｎｍの波長を有し、発光ダイオード２３、フィルタ３０及びピンダイオード３１の波長は全て８５０ｎｍである。
【００７５】
図１６の制御及び外部同期信号ドライバ２４は、周知のファイバ光信号ドライバであり、パルス若しくはアナログ駆動信号を処理又は振幅変調（ＡＭ）若しくは周波数変調（ＦＭ）された駆動信号に変換して発光ダイオード２３を駆動する。
【００７６】
ファイバ送信機６とファイバ受信機８とが光ファイバケーブル１５を介して接続されており、発光ダイオード２３によって生成された光信号の波長が８５０ｎｍで、図１５のファイバ送信機６のフィルタ３０およびダイオード３１の光波長を相反するので、発光ダイオード２３から発した外部同期及び／若しくは制御信号は、図１５のピンダイオード３１に到達する。
【００７７】
同様に、発光ダイオード３３から発した１３００ｎｍの信号波長の多重ビデオ信号は、フィルタ２０を介して図１６のピンダイオード２１に到達し、周知の光ファイバ双方向信号伝搬が実現される。
【００７８】
図１６の比較回路６２の入力側は、線路２８Ｌに接続されており、伝送線路１６Ｒに存在する外部同期信号と混合されたビデオ信号を供給され、ＴＶカメラ１０のコンパレータ６２が外部同期信号を分離するのと同じ要領で、その混合信号を所定の基準信号或は電圧６０と比較することによってビデオ信号から外部同期信号を分離する。
【００７９】
同様に、制御コード抽出器７６Ａは、線路２８Ｌから供給された複合信号から制御信号を抽出する。図１３を参照するに、制御コード抽出器７６Ａは、ビデオ信号から水平同期信号と垂直同期信号を分離する同期信号分離回路８２と、各フィールド或はフレームの水平走査線数を数えるカウンタ８４と、そのカウンタ８４によって数えられた値が所定値に等しいときにビデオ信号を期間中にだけ出力するゲート回路８６と、ゲート回路８６の出力信号の包絡線或はレベルを検知することによってコード信号を再生するレベルセンサ８８と、で構成される。また、カウンタ８４は、図１６のファイバ受信機８の制御信号クリッパ３５を作動させるクリッピングパルスＣＰ４を供給する。
【００８０】
外部同期信号のタイミング生起（timing incidence）が制御信号のタイミングと異なるので、分離された外部同期信号および制御信号を制御及び外部同期ドライバ２４に供給したときに両者が干渉し合うことはない。
【００８１】
更に、外部同期信号レベルは、ビデオ信号レベルより高く、制御信号の最大レベルは、図１１の（Ａ）のビデオ信号の最高レベルとなるビデオ信号の白色信号レベルである。従って、制御及び外部同期ドライバ２４は、時間で分離される２つの異なる光信号を発するため発光ダイオード２３に２つの異なるレベルの信号を供給する。
【００８２】
制御信号がファイバ送信機６のビデオ線路に再注入されるので、再注入制御信号を含んだ受信信号が制御コード抽出器７６Ａの入力側にフィードバックする閉信号ループ及び発振を防止するためビデオ線路２８Ｌから再注入制御信号を取り除く必要がある。
【００８３】
図１３の制御コード抽出器７６Ａのゲート８６は、このゲートがレベルセンサ８８に複合信号を出力する間に、即ち受信制御器９或は９０によって注入される制御信号の具体的な所定水平期間中にクリッピングパルスＣＰ４を供給する。図１１の（Ｄ）のクリッピングパルスＣＰ４は、その周期中だけ図１６の制御信号クリッパ３５に供給されて制御信号クリッパ３５を駆動し、ファイバ送信機６に再注入される制御信号が全てクリッピングされ、除去される。図１１の（Ｄ）に示されるのは、１の水平走査周期の期間を有するクリッピングパルスＣＰ４であり、図１１の（Ｅ）は、制御信号クリッパ３５の出力側でクリッピングされた信号を示している。しかし、受信制御器９、１１又は９０によって発生した制御信号が対応するいくつかの水平周期の間にビデオ信号に注入される場合は、クリッピングパルスＣＰ４の所定期間はその複数周期の期間となる。
【００８４】
図１５において、ファイバ送信機６は、ビデオドライバ３４の入力と発光ダイオード３３とから制御及び外部同期信号を除去するための制御信号クリッパ３５と外部同期信号クリッパ２５とから成り、もって発射された光信号から制御及び／又は外部同期信号を除去し、閉信号ループを防止する。従って、光ファイバケーブル１５を介して光ファイバ受信機８に到達する光信号は、外部同期或は制御信号成分を含まない。ともかく、光ファイバ線路および伝送線路の連結設定時に、残留閉信号ループ或は信号エラーが発生しないように、受信制御器およびＴＶカメラを含む、光ファイバ線路および伝送線路に接続する各要素に沿って制御信号及び外部同期信号クリッピング回路を導入することが望ましい。
【００８５】
図１６のファイバ受信機８を参照するに、外部同期クリッパ２５は、図７の受信制御器９の外部同期クリッピング回路３８に類似しており、出力コネクタ２８から残留外部同期信号を除去する。
【００８６】
周知のピンダイオード２１に到達する光信号は、光学信号を電気信号に変換し、この電気信号をビデオプロセッサ２２の入力側に供給する。ビデオプロセッサ２２は、光ファイバケーブル１５を介して供給される光学信号がアナログ信号或は振幅変調信号の場合にアナログ増幅器を採用し、光ファイバケーブル１５を介して供給される光学信号が周波数変調された信号（ＦＭ信号）であるときはＦＭモジュレータ回路を採用する。
【００８７】
ビデオプロセッサ２２は、更に、ビデオ信号を出力するため周知の小信号トランスインピーダンス増幅器及び出力ビデオ増幅器から成る。出力されたビデオ信号は、外部同期クリッパ２５及び制御信号クリッパ３５を介してビデオ出力コネクタ２８に供給される。
【００８８】
上述のように、図１６のファイバ受信機８は、外部同期信号及び制御信号を出力コネクタ２８に存在する信号から抽出し、この抽出信号を光ファイバコネクタ２７に再注入して、ビデオ信号を妨害せずに外部同期信号及び／又は制御信号をビデオ信号の伝搬とは逆の方向に伝搬させ、もって双方向信号を搬送する共通コネクタを介して光ファイバ線路と伝送線路とを接続する。
【００８９】
また、図１５のファイバ送信機６は、出力コネクタ１７を介して光ファイバケーブル１５によって伝搬された外部同期信号及び／又は制御信号を抽出し、この抽出信号をビデオ信号の伝搬を妨害せずにビデオ信号の伝搬とは逆の方向で入力コネクタ１８に再注入し、もって双方向信号を搬送する共通コネクタを介して光ファイバ線路と伝送線路の接続を行う。
【００９０】
図８に示されているのは、ファイバ受信機８が光学ビデオ信号を処理する要領で、光学コネクタ２７、フィルタ２０及びピンダイオード２１並びにビデオプロセッサ２２を介して光学ビデオ信号を処理する受信制御器１１である。外部同期信号及び／又は制御信号は、外部同期発生器４４及び制御信号ゲート５４から制御及び外部同期ドライバ２４に直接供給され、図１６のファイバ受信機８の使用を不要とする。しかし、ファイバ送信機６は、受信制御器１１に光ファイバケーブル１５を介して直接接続し、ファイバ送信機とＴＶカメラ１０を接続する伝送線路１６Ｔに外部同期及び／又は制御信号を再注入する手段を提供するようにしてもよい。
【００９１】
図７、図８および図１７にそれぞれ示される受信機９、１１、９０は、残留制御信号をビデオ信号からクリッピングする制御信号クリッピング回路５７を備えており、閉信号ループによる残留制御信号は、識別コード抽出器の入力に再入力されず、コード抽出エラーが起こることはない。制御信号クリッピング回路５７は、同期カウンタ５２の出力によって起動し、図１６の制御信号クリッパ３５と同様に動作する。
【００９２】
図１７に示されているのは、複数のＴＶカメラ１０又は１２を選択的に接続するセレクタスイッチ９１からなる受信機９０である。複数のＴＶカメラ１０或は１２を選択的に受信制御器９０にセレクタスイッチ９１を介して接続するとき、図９及び図１０の複数のＴＶカメラ１０或は１２の内部同期発生器６４を全て外部的に同期させて互いにロックし、もって一方のＴＶカメラから他方のＴＶカメラへ切り換え或は選択時或はその直後の妨害を防ぐことが望ましい。
【００９３】
外部同期発生器４４は、図７及び図８の受信制御器９及び１１が個々の伝送線路或は光ファイバケーブルに外部同期信号を注入する要領で、バッファ３６及びコネクタ１６を介して外部同期信号を伝送線路１６Ｒに供給し、バッファ３６Ａ並びに制御及び外部同期ドライバ２４を介して光ファイバケーブル１５に供給する。
【００９４】
図１７の制御発生器４９によって発生した制御信号は、図７の受信制御器９のバッファ５６が制御信号を注入する要領でバッファ５６を介して伝送線路１６Ｌに注入されるか、図８の受信制御器１１のゲート５４が制御信号を供給する要領でゲート５４から制御及び外部同期ドライバ２４に直接供給される。
【００９５】
図１７のスイッチ９１は、単極ロータリスイッチであるが、電気的なスイッチでもよく、例えばアナログＩＣスイッチ又はマトリックスＩＣスイッチ或は他の電気的若しくは機械的スイッチ又はスイッチの組合せでもよい。スイッチの出力極は、線路１６Ｓを介し、制御信号クリッピング回路５７及び同期パルスクリッピング回路３８を経由して制御或は外部同期信号の残留がないビデオ信号を出力する。多数の伝送線路１６Ｒを受信制御器９０のスイッチ９１の入力極に接続すると、バッファ５６の出力を多数の負極へ接続するかわりに線路１６Ｓに接続することができ、制御信号を選択的にＴＶカメラに供給することができる。
【００９６】
また、制御信号を多数のバッファ５６を介してスイッチ９１の多数のｎ極に平行に供給することもできる。選択的に接続されたカメラの認識と制御コードとを合成することにより、各ＴＶカメラ１０或は１２を確認と同時に制御することができ、全てのＴＶカメラ１０或は１２に制御信号を平行して一度に供給できる。更に、スイッチ９１を介して選択されたＴＶカメラだけがコード抽出器７６によって抽出され、制御信号発生器５０を介して制御コマンドに混合されるＩＤを有するので、混合コードが図９及び図１０のＴＶカメラのコード比較回路７８によってＴＶカメラの識別コードと比較されたとき、制御信号に応答する唯一のＴＶカメラ１０或は１２となる。
【００９７】
図１０のＴＶカメラ１２は、公知の発光ダイオード若しくはレーザ３３と、フォトトランジスタ若しくはピンダイオード３１と、ファイバ送信機６に類似する構成の周知の光分割器を採用する光ファイバコネクタ１７に光学的に接続されたフィルタ３０と、から成る。同様に、ビデオドライバ３４と、外部同期及び制御信号プロセッサ３２と、制御コード抽出器７７と、比較回路３６と、基準電源３９は、全てファイバ送信機６の回路に類似した回路であり、ファイバ送信機６の回路の場合と同様に内部で接続されている。
【００９８】
比較回路３６は、図１０および図１５の制御コード抽出器７７に外部同期パルスＰ３を供給する。図１４において、パルスＰ３は、生起及び継続期間（incidence and duration）タイマ８５の入力に供給され、遅延及び継続期間を有する所定のゲートパルスを発生させ、制御信号が発生している時間及びそのタイミングに相当する水平線の所定持続時間中だけゲート８７を動作させる。制御信号は、制御コード抽出器７６及び７６Ａに関して述べられているような構成で、線路３２Ｌからゲート８７を介してレベルセンサ８８に供給される。同様に、制御コード抽出器７７は、図１３に示されるように同期分離回路８２を介してビデオ線路に接続することにより、Ｈ及びＶ信号が、生起及び継続期間タイマ８５にＰ３の代わりに供給される。また生起及び継続期間タイマ８５は、クリッピングパルスＣＰ５を出力し、図１５のファイバ受信機６の制御信号クリッパを駆動する。
【００９９】
従って、外部同期及び／又は制御信号は、光ファイバ送信機６と受信制御器１１或は９０との間の光ファイバケーブルを介して伝搬する。光ファイバ送信機６は、外部同期及び／又は制御信号を注入する。伝送線路１６Ｔは、ＴＶカメラ１０とファイバ送信機６とを接続し、双方向信号の伝搬、即ちＴＶカメラ１０からファイバ送信機６に向かうビデオ信号並びに共通コネクタ１６或は１８を経由してＴＶカメラに向かう同期及び／又は制御信号を伝搬させる。
【０１００】
また、ＴＶカメラ１２によって発生したビデオ信号をファイバ受信機を介して受信制御器９に搬送する光ファイバケーブル１５は、外部同期及び／又は制御信号をＴＶカメラ１２に伝搬させ、外部同期及び／又は制御信号は、受信制御器９或は９０によってファイバ受信機８と受信制御器９或は９０とを共通コネクタ１６、２８で接続する伝送線路１６Ｒに注入される。
【０１０１】
同様に、ＴＶカメラ１２は、双方向信号、即ち受信制御器１１或は９０に向かうビデオ信号並びにＴＶカメラ１２に向かう外部同期及び／又は制御信号を伝搬させる１本の光ファイバケーブル１５を用いて受信制御器１１或は９０に接続される。またＴＶカメラは、比較回路３６及び制御コード抽出器７７を介して外部同期パルス、制御コードをそれぞれ取り出す。受信制御器１１或は９０のクリッピング回路５７及び３８は、閉信号ループ及び／又は出力信号レベルエラーを防止するため残留反射信号を取り除く。
【０１０２】
本願における外部同期及び制御信号クリッピング回路はそれぞれ独立した回路となっているが、１つのクリッピング回路として利用することも可能であり、図１５のＰ３及びＣＰ５、又は図１６のＰ３及びＣＰ４、又は図７のＰ２及び同期カウンタ５２の出力信号のような２つのクリッピングパルスを合成し、１個とされたクリッピング回路に供給することによって外部同期及び制御信号の両者をクリッピングする。
【０１０３】
図７、図８及び図１７について説明するに、受信制御器９、１１或は９０の各外部同期発生器４４には、多数の受信機を採用する監視システムの複数の受信制御器９、１１或は９０を同期して駆動させるためにマスター外部同期信号が供給される。
【０１０４】
同様に、図１６の制御及び外部同期ドライバ２４にコネクタ４４Ａを介して図７の受信制御器９から出力された同期駆動信号を、比較回路６２から供給された抽出外部同期信号の代りにコネクタ４４Ｂを介して供給することにより、その制御及び外部同期ドライバ２４を同期させて駆動することもできる。また、図７の受信制御器９からコネクタ４９Ａを介して出力された制御信号を、制御コード抽出器７６Ａの出力信号の代りに図１６の制御及び外部同期ドライバ２４にコネクタ４９Ｂを経由して供給することもできる。これにより、ＴＶカメラ１０とファイバ送信機６とは伝送線路１６Ｔ並びに共通コネクタ１６及び１８を介して接続され、ファイバ受信機８は、図１６のコネクタ４４Ｂ、４９Ｂ及び２８に接続される図７及び図１７の個々のコネクタ４４Ａ、４９Ｂ及び１６を介して受信制御器９に接続される。
【０１０５】
更に、図９のＴＶカメラは、図１５のファイバ送信機６に個々のコネクタ１６、１８、４４Ｃ及び４９Ｃを介して接続することができ、伝送線路１６Ｔ及びコネクタ１６及び１８を介してビデオ信号、並びに、個々のコネクタ４４Ｃ及び４９Ｃを介して外部同期及び／又は制御信号が供給される。従って、ＴＶカメラ１０は光ファイバ線路に接続され、図１６のファイバ受信機８は、ビデオ信号を伝送線路１６Ｒに供給するとともに、伝送線路１６Ｒからの外部同期及び／又は制御信号を抽出し、抽出された信号を光ファイバコネクタ２７に再注入する、といった双方向信号処理を行い、伝送線路１６Ｒは、共通コネクタ１６及び２８を介して受信制御器９或は９０に接続される。
【０１０６】
図９のＴＶカメラ１０と図１５のファイバ送信機６との間にある個々のコネクタを使用すれば、図示された制御信号注入器３７及び外部同期信号注入器３８は必要ない。同様に、図９の制御コード抽出器７６、比較回路６２及び基準電圧源６０も不要である。
【０１０７】
上記から明らかなように、図１乃至図５に示された全システムは連結可能であり、部分的に或はシステム全体として応用でき、如何なるシステムの形態においても線路の少なくとも一部は共通コネクタを介して接続できる。更に、閉ループ信号が再合成双方向信号に影響を及ぼすことはない。
【０１０８】
本発明は、監視システムに使用される情報伝送線路及び光ファイバ線路装置だけでなく、他の情報伝搬装置にも応用できる。
【０１０９】
言うまでもなく、以上の開示は本発明の好適実施形態のみに関するものであり、本開示の変形例をカバーすることを示唆し、この変形例は本発明の範囲及び趣旨を逸脱したものでないと理解できよう。
【図面の簡単な説明】
【図１】本発明の好適実施形態による光ファイバ線路接続装置のブロック図。
【図２】本発明の好適実施形態による光ファイバ線路接続装置のブロック図。
【図３】本発明の好適実施形態による光ファイバ線路接続装置のブロック図。
【図４】本発明の好適実施形態による光ファイバ線路接続装置のブロック図。
【図５】本発明の好適実施形態による光ファイバ線路接続装置のブロック図。
【図６】図１乃至図５の装置によって伝送される信号の波形図。
【図７】図２及び図３に示される装置の好適実施形態の受信装置を示す電気回路ブロック図。
【図８】好適実施形態の受信装置に光ファイバケーブルを接続するコネクタを提供する図７の電気回路の変形ブロック図。
【図９】図１、図３、及び図５の装置の好適実施形態のＴＶカメラを示す電気回路ブロック図。
【図１０】好適実施形態の送信装置に光ファイバケーブルを接続するコネクタを提供する図９の電気回路の変形ブロック図。
【図１１】識別コード信号およびそのクリッピング回路の波形図。
【図１２】図７の受信装置及び図９のＴＶカメラの好適実施形態のコード抽出回路のブロック図。
【図１３】図１６のファイバ受信機の好適実施形態におけるコード抽出回路のブロック図。
【図１４】図１０のＴＶカメラの変形例及び図１５のファイバ送信機の好適実施形態のコード抽出回路のブロック図。
【図１５】本発明の好適実施形態の情報伝送線路に光ファイバケーブルを接続するファイバ送信機のブロック図。
【図１６】本発明の好適実施形態における情報伝送線路に光ファイバケーブルを接続するファイバ受信機のブロック図。
【図１７】図５の装置における他の好適実施形態としてのセレクタを備える受信装置の電気回路ブロック図。
【符号の説明】
１、２、３、４、５．．．情報伝送システム
６．．．ファイバ送信機
７．．．ファイバ受信機
８．．．ファイバ受信機
９．．．受信制御器
１０．．．ＴＶカメラ
１１．．．受信制御器
１２．．．ＴＶカメラ
１５．．．光ファイバケーブル
１６．．．伝送線路コネクタ
１６Ｌ．．．ビデオ線路
１６Ｒ．．．伝送線路
１６Ｔ．．．伝送線路
１７．．．コネクタ
１８．．．コネクタ
２０．．．フィルタ
２１．．．ピンダイオード
２２．．．ビデオプロセッサ
２３．．．発光ダイオード
２４．．．制御及び外部同期信号ドライバ
２５．．．外部同期信号クリッパ
２７．．．コネクタ
２８．．．コネクタ
２８Ｌ．．．線路
３０．．．フィルタ
３１．．．ピンダイオード
３２．．．外部同期及び制御信号プロセッサ
３２Ｌ．．．線路
３３．．．発光ダイオード
３４．．．ビデオドライバ
３５．．．制御信号クリッパ
３６．．．バッファ回路比較回路
３７．．．制御信号注入器
３８．．．同期パルスクリッピング回路外部同期信号注入器
３９．．．基準電源
４１．．．出力コネクタ
４２．．．オーディオデコーダ
４２Ａ．．．オーディオ出力コネクタ
４４．．．外部同期発生器
４４Ａ．．．コネクタ
４４Ｂ．．．コネクタ
４６．．．同期分離回路
４７．．．制御信号発生器
４９Ａ．．．コネクタ
４９Ｂ．．．コネクタ
５０．．．制御信号発生回路
５２．．．カウンタ
５３．．．ゲート回路
５６．．．バッファ回路
５７．．．制御信号クリッピング回路
６０．．．基準電圧源
６２．．．電圧比較器
６４．．．内部同期信号発生回路
６６．．．ビデオ信号発生回路
６８．．．オーディオ信号発生回路
７０．．．オーディオ信号注入回路
７２．．．識別コード設定回路
７４．．．識別コード注入回路
７６．．．制御コード抽出器
７６Ａ．．．制御コード抽出器
７７．．．制御コード抽出器
７８．．．識別コード比較回路
８０．．．デコーダ
８２．．．同期信号分離回路
８４．．．カウンタ
８５．．．生起及び継続期間タイマ
８６．．．ゲート回路
８７．．．ゲート
８８．．．レベルセンサ
９０．．．受信制御器及びセレクタ
９１．．．セレクタスイッチ
Ｐ１．．．外部同期パルス
Ｐ２．．．パルス信号
Ｐ３．．．外部同期パルス
ＣＰ４．．．クリッピングパルス
ＣＰ５．．．クリッピングパルス
Ｖｗ．．．ビデオ信号の白色レベル
Ｖｂ．．．黒レベル
Ｈ．．．水平同期信号内部同期信号
Ｖ．．．垂直同期信号内部同期信号[0001]
BACKGROUND OF THE INVENTION
According to the present invention, an external synchronization signal and a control signal are injected into an optical fiber line carrying an information signal propagated from a remotely located transmitter, and the injected signal is transmitted through the same optical fiber transmission line. The present invention relates to an optical fiber connection method, a transmission apparatus or a reception apparatus, and an optical fiber system that transmit to the transmitter in a direction opposite to propagation.
[0002]
[Prior art]
In a closed circuit television (TV) system used as an information transmission system, one or a plurality of TV cameras are connected to a monitoring station via a single or multiple transmission lines. These TV cameras may include remote control position adjustment devices for their pan, tilt or zoom lenses. In addition, this camera has remote control functions such as a wiper, a washer, a heater, and an illuminator, and may have various circuits that are remotely set by a control command issued from a monitoring station.
[0003]
Various camera function remote control methods employ AC or DC control via multiple control cables, and also employ digital command codes transmitted via twisted pair wires or fiber optic cables. is there. In addition, other methods for transmitting control command codes to a TV camera via a video coaxial cable carrying an information signal are disclosed in U.S. Pat. Nos. 4,989,085, 5,335,014 and 5,579. , 060, the contents of which are hereby incorporated herein by reference.
[0004]
When a plurality of TV cameras are connected to a monitoring station via a plurality of transmission lines, the transmission lines are connected to a switch for selectively displaying the cameras on the TV monitor. If the closed circuit TV system does not employ external synchronization for that TV camera, the selected image displayed on the monitor will be disturbed when switching from one TV camera to another TV camera or immediately thereafter. Therefore, it is desirable to synchronize all TV cameras of the system externally in order to perform a perfect switch from camera to camera and to ensure that there are no obstacles to the display image at and immediately after the switch.
[0005]
As one device for synchronizing a plurality of TV cameras, a device that transmits a vertical synchronization signal and a horizontal synchronization signal or a composite synchronization signal used in a TV system is widely known. An apparatus that transmits a vertical drive signal and a horizontal drive signal and drives a TV camera and its deflection / timing circuit by the transmitted vertical and horizontal drive signals is also widely known.
[0006]
In the conventional apparatus as described above, since the transmitted synchronization signal itself is also a pulse matrix that is easily affected by noise, for transmission of the synchronization signal, a dedicated coaxial cable having a high shielding effect, or in particular, a plurality of It is necessary to use a dedicated optical fiber cable that complicates a system including a TV camera and increases its cost.
[0007]
As another method and apparatus for synchronizing a plurality of TV cameras, an external synchronization signal is injected into the video signal transmission line, and the internal synchronization signal generator of the TV camera is locked via the transmitted external synchronization signal. There is known a method and apparatus for transmitting an external synchronization signal from an external synchronization signal generator to a TV camera. Such a device is disclosed in US Pat. No. 4,603,352, the contents of which are hereby incorporated by reference.
[0008]
Some optical fiber transmission lines used for video signal propagation are also used for transmission of bidirectional signals such as external synchronization signals or digital control signals in the opposite direction of video propagation, but these optical fiber transmission lines Requires a dedicated input / output terminal for the supplied external synchronization signal or control signal at both ends of the optical fiber line, and these are added to the video input / output terminals at both ends of the optical fiber transmission line. Is. Therefore, the method and apparatus for supplying the external synchronization signal and the control signal via the video coaxial cable as described above cannot be applied to the optical fiber transmission line.
[0009]
[Problems to be solved by the invention]
It is an object of the present invention to provide a transmission line, such as a coaxial cable or stranded wire, that carries bidirectional signals, ie, one-way information signals from the transmitter and external synchronization signals and / or control signals in the opposite direction to the transmitter. It is connected to the fiber transmitter of the optical fiber line through the common terminal for bidirectional signals.
[0010]
As used in this document, the term “fiber optic line” refers to a single fiber optic cable with bi-directional fiber optic transceivers connected at both ends, and a fiber optic cable that connects a fiber optic cable to a transmitter. The one that connects the optical fiber cable to the receiver is called a “fiber receiver”.
[0011]
Another object of the present invention is a coaxial cable or stranded wire that carries bidirectional signals, i.e., one-way external synchronization signals from the reception controller and / or control signals and information signals in the opposite direction to the reception controller. Is connected to a fiber receiver of an optical fiber line via a bidirectional signal common terminal.
[0012]
Still another object of the present invention is to introduce and connect an optical fiber line between two parts of a transmission line such as a coaxial cable or a stranded wire, one part as a transmitter and the other part as a reception controller. Connected to each other so that both parts of the transmission line carry bidirectional signals, ie one-way information signal to the receiver and reverse external synchronization signal and / or control signal to the transmitter, so that the optical fiber Each end of the line is connected to one transmission line via the bidirectional signal common terminal.
[0013]
According to the present invention, when the optical fiber line is connected to an information transmission line such as a coaxial cable or a stranded wire, the optical fiber line propagates a bidirectional signal in the same manner as the coaxial cable or the stranded wire.
[0014]
Yet another object of the present invention is to connect one end of a fiber optic cable directly to a transmitter and the other end directly to a reception controller to provide a bi-directional signal, ie, an information signal from the transmitter to the reception controller and Propagating external synchronization signals and / or control signals from the reception controller to the transmitter.
[0015]
[Means for Solving the Problems]
A method of connecting an optical fiber line to an information transmission line carrying a bidirectional signal is based on a signal level and / or signal timing, and an external synchronization signal and / or control signal is derived from a composite signal interposed in an output connector of a fiber receiver. Separating and reinjecting the separated signal into a drive circuit that provides an optical signal to the fiber optic connector of the fiber receiver. This is followed by the steps of extracting external synchronization and / or control signals from the fiber transmitter fiber optic connector and reinjecting the extracted external synchronization and / or control signals into the fiber transmitter input connector. Thus, the external synchronization signal and / or control signal is transferred from the fiber receiver output connector to the fiber transmitter input connector.
[0016]
The device according to the invention is a video, such as one or more TV cameras, connected to one or more information transmission lines or optical fiber lines and supplying a video signal to one or more receiving means. Including signal generating means; Each video signal generating means has an internal synchronizing signal generating circuit for generating an internal synchronizing signal synchronized with the external synchronizing signal.
[0017]
According to the present invention, the external synchronization signal is a pulse signal having a voltage level that is higher than the maximum voltage level of the video signal or lower than the minimum voltage level. The receiving means has a circuit for injecting an external synchronization signal into an information transmission line or an optical fiber line connected to the video signal generating means. Each video signal generation means has a level comparison circuit that extracts an external synchronization signal by comparing the signal level of the external synchronization pulse signal with a reference signal having a predetermined voltage, and the extracted external synchronization signal is converted into an internal synchronization signal generation circuit. To supply. Since the external synchronization pulse is generated during the blanking period of the video signal, the external synchronization signal can be transmitted through a common transmission line used for transmission of the video signal without affecting the video signal.
[0018]
In the embodiment, each video signal generating means preferably includes a circuit for removing an external synchronization signal from an output signal supplied to the receiving means via a corresponding information transmission line or optical fiber line. As a result, the external synchronization signal can be removed from the video signal transmitted through the information transmission line or the optical fiber line, so that the external synchronization signal does not affect the receiving means input circuit and is received without the video signal. it can.
[0019]
In the embodiment, each video signal generating means further generates an identification code signal corresponding to an identification number assigned to each video signal generating means, and the identification code signal is injected into the video signal supplied to the receiving means. A code generation circuit may be included.
[0020]
The receiving means may further include an identification code signal processing means for extracting an identification code signal from the received signal.
[0021]
The identification code signal processing means preferably generates a decoded signal by extracting the identification code signal from the received signal and decoding the extracted identification code signal, and a memory for storing identification data of each assigned code number An extraction circuit and a controller that reads the identification data of the decoded signal from the memory and superimposes the read identification data on the video signal. Thus, the received video signal is identified by the identification code signal processing means for collating the video generating means that is transmitting the video signal, thereby providing a foundation for error-free control of the video generating means.
[0022]
The apparatus of the present invention further includes control means for generating and supplying a control signal that is decoded and supplied by the extraction circuit to mix the encoding control command with the identification code signal to control the video signal generating means. . The encoding control command is supplied to the video signal generation means for operating the video signal generation means only when the identification code signal mixed with the control signal matches the identification number assigned to the video signal generation means being controlled. Thereby, only the specific video signal generating means having the identification code extracted and decoded by the control means at the time of the control processing makes the assigned identification number coincide with the identification code extracted from the control signal supplied from the control means. Can do. Therefore, any specific video signal generating means can be authenticated and properly controlled.
[0023]
The control signal is injected into an information transmission line or an optical fiber line connecting the video signal generating means to the receiving means during the vertical blanking period of the video signal. The video signal generating means further extracts a control signal from the information transmission line or the optical fiber line, and controls to supply the extracted control signal only when the identification code signal mixed with the control signal matches the assigned identification code. Signal processing means may be included. Since the control signal is transmitted during the blanking period of the video signal, it can be transmitted from the receiving means to the video signal generating means via the common transmission line without interfering with the video signal.
[0024]
Each video signal generating means preferably generates a mixed signal composed of a video signal and an audio signal by injecting an audio signal into the video signal, and the mixed signal is transmitted to a corresponding information transmission line or optical fiber. It further includes signal mixing means for supplying to the line. Thus, the mixed video signal and audio signal are transmitted between the video generating means and the receiving means via a common information transmission line or optical fiber line.
[0025]
The receiving means may further include an audio signal reading means for outputting an audio signal by extracting the audio signal from the mixed signal.
[0026]
The receiving means may further include a control signal driver for supplying a control signal in a direction opposite to the propagation direction of the video signal to either the information transmission line or the optical fiber line. Each video generation means preferably extracts a control signal from an information transmission line or an optical fiber line and supplies the extracted control signal to the drive circuit of the video generation means to provide a remote positioning device for the camera or its lens, etc. A control signal extractor for operating the peripheral device may be further included.
[0027]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows an apparatus for connecting optical fiber lines in an information transmission system 1 as a preferred embodiment of the present invention, and shows an example applied to a dedicated closed circuit television (TV) system such as a monitor system. An information signal in a closed circuit TV system includes a video signal. In the following description, a video signal is a composite video signal, a digital video signal, a multiplexed video and audio signal, or a multiplexed video and data signal, a multiplexed video. Audio and data signals may be used.
[0028]
In FIG. 1, an information transmission system 1 includes a TV camera 10 that transmits a video signal to a fiber transmitter 6 via a transmission line 16T. The fiber transmitter 6 outputs a video signal to the reception controller 11 via the optical fiber cable 15. The reception controller 11 receives the video signal, generates an external synchronization signal and / or control signal for externally synchronizing and / or controlling the TV camera 10, and a fiber transmitter via the optical fiber cable 15. 6 is supplied. From here, an external synchronization signal and / or control signal is injected into the transmission line 16T to synchronize and / or control the TV camera 10 externally.
[0029]
As shown in FIG. 1, two connectors 17 for connecting the optical fiber cable 15 and 18 for connecting the transmission line 16T are common connectors for bidirectional signals propagating through the optical fiber cable 15 and the transmission line 16T. It is. Similarly, in FIG. 2, two connectors 27 for connecting the optical fiber cable 15 and 28 for connecting the transmission line 16R are bidirectional signals, that is, a one-way video signal supplied to the reception controller 9. , A common connector for external sync and / or control signals in the reverse direction to the TVTV camera.
[0030]
Referring to FIG. 2, the information transmission system 2 includes a TV camera 12 that transmits a video signal to a fiber receiver 8 via an optical fiber cable 15. The fiber receiver 8 outputs a video signal to the reception controller 9 via the transmission line 16R. The reception controller 9 receives the video signal, generates an external synchronization signal and / or control signal for externally synchronizing and / or controlling the TV camera 12, and sends it to the fiber receiver 8 via the transmission line 16R. Supply. From this, the external synchronization signal and / or control signal is injected into the optical fiber cable 15 and supplied to the TV camera 12.
[0031]
The reception controller 11 of FIG. 1 is directly connected to the optical fiber cable 15 via the optical fiber connector 27, and the TV camera 12 of FIG. 2 is connected to the optical fiber cable 15 via the optical fiber connector 17. Yes. The reception controller 11 includes a built-in fiber receiver, and similarly, the TV camera 12 includes a built-in fiber transmitter. Accordingly, a separate fiber receiver is not required for the information transmission system 1 of FIG. 1, and a separate fiber transmitter is not required for the information transmission system 2 of FIG.
[0032]
FIG. 3 shows an information transmission system 3 as another preferred embodiment, in which a fiber receiver 8 and a fiber transmitter 6 connected by an optical fiber cable 15 are between two parts 16R and 16T of a transmission line. Is provided. Therefore, the TV camera 10 and the reception controller 9 employ a transmission line connector 16 such as a conventional coaxial cable connector or terminal used for connecting a stranded transmission line.
[0033]
FIG. 4 shows an information transmission system 4 in which the TV camera 12 and the reception controller 11 have a fiber transmitter and a fiber receiver, respectively, so that signals and optical fibers directed to the camera through the optical fiber connector 17 are shown. It is directly connected by an optical fiber cable 15 for transmitting a bidirectional signal of a signal going to the reception controller through the connector 18.
[0034]
FIG. 5 shows an information transmission system 5 as still another preferred embodiment of the present invention. The plurality of TV cameras 10 and 12 are connected to a reception controller and selector 90 via a plurality of transmission lines 16R or optical fiber cables 15. Each of the transmission lines or optical fiber lines connecting the multiple cameras 10 and 12 to the reception controller and selector 90 allows the information transmission system 1, 2, 3 or 4 of FIGS. Bidirectional signals are propagated in exactly the same way.
[0035]
FIG. 7 shows a reception controller 9 incorporating a known external synchronization generator 44 for supplying an external synchronization pulse P1 to the buffer circuit 36. The buffer circuit 36 injects an external synchronization pulse P1 into the video line 16L and the connector 16.
[0036]
The frequency of the external synchronization signal P1 is related to the vertical frequency of the video signal generated by the TV camera 10 or 12, having a frame or field scanning frequency. For example, in the case of an NTSC system, the frame frequency is 30 Hz and the field frequency is 60 Hz. In this case, the frequency of the external synchronization pulse P1 is either a frame frequency of 30 Hz or a field frequency of 60 Hz.
[0037]
As shown in FIG. 6A, the time when the external synchronization signal P1 is generated is adjacent to the vertical synchronization pulse, and during the vertical blanking period of the video signal transmitted from the TV camera 10 or 12 Occurs. As a result, the external synchronization signal P1 is propagated to the TV camera 10 or 12 via the common transmission line 16R that carries the video signal without affecting the video signal. The voltage level of the external synchronization signal P1 is preferably higher than the white level Vw of the video signal. However, the voltage level of the external synchronization signal P1 may be lower than the minimum level of the video signal.
[0038]
In the following description, a frame external synchronization pulse having a voltage level higher than the white level of the video signal, in particular, a frame external synchronization pulse corresponding to the phase of the second field is used as the external synchronization signal P1.
[0039]
In the illustrated embodiment, each TV camera 10 or 12 is a TV camera that operates in synchronization with the external synchronization signal P1. As this TV camera, a well-known one used in synchronization with an external sync signal having a voltage level higher (or lower) than the level of the video signal as disclosed in US Pat. No. 4,603,352 is used. Is done.
[0040]
Each TV camera 10, 12 generates an identification (ID) code composed of numbers or characters such as 1, 2, 3,... N, and injects it into the video signal during the vertical blanking period.
[0041]
Each TV camera 10 or 12 has a circuit for generating a code signal corresponding to the identification code and a circuit for generating a composite signal in which the code signal is injected into the video signal. Such a device is disclosed in US Pat. No. 4,603,352, the contents of which are hereby incorporated herein by reference. Accordingly, each information signal received by the reception controller 9, 11 or 90 includes an identification code.
[0042]
As shown in FIG. 7, the external synchronization generator 44 of the reception controller 9 outputs the pulse signal P2 shown in FIG. 6B synchronized with the external synchronization signal P1 supplied from the external synchronization generator 44. provide. The buffer circuit 36 for injecting the external synchronization signal receives the pulse signal P1 and injects it into the video signal transmission line 16L, whereas the pulse signal P2 is supplied from the video signal transmission line 16L passing through the synchronization pulse clipping circuit 38. Is supplied to a sync pulse clipping circuit 38 for clipping the sync pulse P1 from the received signal, and a video signal not including the sync pulse is supplied to the output connector 41.
[0043]
The synchronization pulse clipping circuit 38 is supplied with the signal of FIG. 6A from the video signal transmission line 16L and the timing signal P2 of FIG. 6B from the external synchronization generator 44. The signal P2 activates the clipping circuit during its duration, so that the clipping circuit 38 is the entire signal portion of the signal supplied to the input terminal of the clipping circuit on the black level Vb of the video signal during the period of the signal P2. Clip. Since the duration of P2 includes the cycle of the external synchronization signal P1, the external synchronization signal P1 is removed by the clipping circuit 38 from the composite video signal supplied to the output connector 41 as shown in FIG.
[0044]
Therefore, even if the external synchronization signal P1 is included in the video signal supplied from the TV camera 10 or 12 via the transmission line 16L, it is removed by the clipping circuit 38. As a result, the external synchronization signal P1 injected into the video signal transmission line 16L synchronizes the TV camera 10 or 12, and does not cause a reception error in the display device connected to the output connector 41.
[0045]
When the TV camera 10 or 12 generates an audio signal, this signal is multiplexed with the video signal inside the TV camera 10 or 12, and the multiplexed signal is transmitted to the fiber via the transmission line 16T. Supplied to the machine 6. The fiber transmitter 6 supplies the multiplexed video signal via the optical fiber cable 15 to the fiber receiver 8 that supplies the multiplexed signal to the reception controller 9, 11 or 90 via the transmission line 16R. The mixed video signal and audio signal are then supplied from the output terminal of the clipping circuit 38 to the audio decoder 42. The audio decoder 42 outputs the decoded audio signal via the audio output connector 42A.
[0046]
The reception controller 9 includes a control signal generator 49 that generates a control signal for controlling the corresponding TV camera 10 or 12. The control signal generator 49 includes a synchronization separation circuit 46 that separates the horizontal and vertical synchronization signals H and V from the video signal propagated through the video line 16L. The control signal generator 49 includes a control signal generation circuit 50 that outputs a control signal for operating the corresponding TV camera 10 or 12 only at a predetermined timing based on the separated synchronization signals H and V. The counter 52 is provided for counting the number of horizontal scanning lines supplied from the sync separator 46 during each frame or field period. In addition, the control signal generator 49 injects a control signal supplied from the control circuit generator 50 and a gate circuit 54 that generates a gate signal when the value counted by the counter 52 is a predetermined value into the video line 16L. And a buffer 56.
[0047]
In a preferred embodiment of the present invention, the injection circuit may comprise a mixer circuit, where a plurality of code signals may be mixed and injected into the composite video signal. Such a mixer circuit is shown in US Pat. No. 4,989,085, the contents of which are incorporated herein by reference. It may also be an injection circuit disclosed in US Pat. No. 5,335,014, the contents of which are incorporated herein by reference.
[0048]
Control commands supplied via the video line 16L to propagate the control command code to the camera 10 or 12 include power on / off, wiper on / off, tilting up / down, panning left Control codes for switching between / right, zooming tele / wide, etc., or a video signal transmission start / stop command may be included. The control signal may be a combination of a control code corresponding to the control command and an identification code assigned to the TV camera 10 or 12, respectively. Further, the control signal is injected into the video line 16L by the buffer circuit 56 of FIG. 7 at a predetermined time during the vertical blanking interval. The injection timing of the control signal to the video line 16L is different from the injection timing of the external synchronization signal to the video line 16L.
[0049]
As apparent from the above, the external synchronization signal and the control signal are transmitted from the receiver 9 to the TV camera via the transmission line 16R.
[0050]
As shown in FIG. 9, each TV camera 1 has a reference source 60 for supplying a reference signal or voltage to a voltage comparator 62, and the voltage comparator 62 transmits from a transmission device via a transmission line 16T. The external synchronization signal P1 is compared with the reference signal or voltage, and the pulse signal P3 is generated when the level of P1 is equal to or higher than the reference signal or voltage, thereby generating an external synchronization pulse. Isolate. The internal synchronization signal generation circuit 64 generates internal synchronization signals H and V that are synchronized with the pulse signal P3 supplied from the voltage comparator 62, and the video signal generation circuit 66 is a video signal that is synchronized with the internal synchronization signals H and V. And the synchronized video signal is supplied to the transmission line 16T. The audio signal generation circuit 68 generates an audio signal together with the video signal, and the audio signal injection circuit 70 injects the audio signal into the video line 16L to mix the audio signal and the video signal.
[0051]
As shown in FIG. 9, each TV camera 10 sets an identification code for generating an identification code assigned to the TV camera 10 at a predetermined time in the vertical blanking period of the composite video signal based on the internal synchronization signals H and V. The circuit 72 and the identification code injection circuit 74 that injects the identification code supplied from the setting circuit 72 into the video line 16L may be provided.
[0052]
The timing at which the identification code is injected into the transmission line 16T by the injection circuit 74 is different from the timing at which the control signal is injected into the transmission line 16R by the reception controller 9 as shown in FIG. The control signal is injected into the transmission line 16R by the reception controller 9 during one or more predetermined horizontal scanning lines during the vertical blanking period of the composite video signal. In contrast, the identification code is injected into the transmission line 16T by the TV camera 10 during one or more separate predetermined horizontal scan lines during the same or another vertical blanking period of the composite video signal.
[0053]
The identification code signal is shown in (A) to (C) of FIG. This identification code signal includes a high level or white that is the maximum or maximum level of the image signal in the video signal, a low level or black that is the minimum level of the image signal, and a TV as shown in FIG. It is a binary code or bar code signal having two or more levels composed of an intermediate level or gray which is an intermediate level of an image signal in a video signal generated by the camera 1. The identification code may be a combination of a pulse signal level and a variable pulse width as shown in FIG.
[0054]
Alternatively, the identification code signal may be a pulse signal or a sine wave signal having a frequency corresponding to the identification code signal, and the sine wave signal or the identification code signal is one or more as shown in FIG. During the horizontal scanning period, preferably during the vertical blanking period.
[0055]
The control signal generator 50 in FIG. 7 generates a control code signal as an electronic shaping signal similar to the identification code signals in FIGS. However, separately formed electrical signals may be applied to the control code signal and the identification code signal. Similarly, the identification code included in the control signal need not be the same as the identification code generated by the identification setting circuit 72 of the TV camera of FIG. Instead of the same identification code, a code corresponding to an ID assigned to each TV camera may be used. The control signal generator 50 of FIG. 7 may generate a well-known telephone dial tone or may comprise an audio compression circuit that compresses real-time audio in one or more field periods into one or more horizontal periods.
[0056]
The TV camera 10 of FIG. 9 compares the extracted identification code with the identification code supplied from the setting circuit 72, and a code extraction circuit 76 that extracts the identification code and control code generated by the control signal generation circuit 50 of FIG. When the two codes correspond to each other, the identification code comparison circuit 78 that supplies a coincidence signal to the decoder 80 and the control code supplied from the code extraction circuit 76 are decoded, and the coincidence signal is supplied from the identification code comparator 78. And a decoder 80 for generating a control command corresponding to the decoding control code only when the decoding control code is received.
[0057]
The code extraction circuit 76 in FIG. 12 includes a counter 84 that counts the number of horizontal sync pulses during the entire field or frame period of the video signal, and a video signal supplied from the video line 16L when the count value of the counter 84 is a predetermined value. For detecting the signal level or detecting the envelope of the signal supplied from the gate circuit 86 and extracting it from the video signal supplied from the transmission line 16T. And a level sensor 88 for reproducing and outputting the generated code signal.
[0058]
The code comparison circuit 78 generates a match signal when the extracted code supplied from the code extraction circuit 76 corresponds to or corresponds to the code set by the setting circuit 72, and the extracted code supplied from the code extraction circuit 76 When the signal corresponds to or does not correspond to the code set by the setting circuit 72, a mismatch (mismatch) signal is generated.
[0059]
The code comparison circuit 78 generates a match signal when the extraction code supplied from the extraction circuit 76 corresponds to or matches the code set in the setting circuit 72, and the extraction code supplied from the extraction circuit 76 is A mismatch signal is generated when the code set in the setting circuit 72 corresponds to or does not match the code set.
[0060]
When the identification code and control code having the signal waveform of FIG. 11C are used, the level sensor circuit 88 of FIGS. 12, 13 and 14 counts the number of pulses or the frequency supplied from the gate circuit 86. A pulse or frequency counter may be included. When the generated control signal is a known dial tone signal or compressed audio signal, the level sensor circuit 88 may further include a known dial tone decoder or a known audio decompression (restoration) circuit.
[0061]
The decoder 80 in FIG. 9 supplies different control commands to different drivers (not shown), turns on / off power, turns on / off the wiper, up / down tilting, left / right panning, tele / wide angle zooming, perspective focus, The TV camera 10 is operated by instructing opening / closing of an aperture, or by instructing start or stop of video signal transmission.
[0062]
The code setting circuit 72 is supplied with data from sensors and switches that form a part of peripheral state data such as positioning of the pan / tilt head and receives codes from the control command execution, or the peripheral state or any camera A diagnostic code relating to the operating state of the internal circuit is generated. A control command execution confirmation code, status or diagnostic code is injected into the video line 16L via a predetermined horizontal line code inserter 74 during the vertical blanking interval.
[0063]
The timing at which the control command execution code, status, and diagnostic code are injected into the video line 16L is different from the timing at which the identification code is injected and the timing at which the control signal generated by the reception controller 9 in FIG. For example, the synchronization signal is injected at the beginning of the first horizontal line during the vertical blanking interval, the identification code is injected during the twelfth horizontal line during the vertical blanking interval, and the control signal and status diagnostic code are Are respectively injected between the 14th and 15th horizontal lines and the 17th horizontal line during the vertical blanking period.
[0064]
Therefore, a multiplexed signal composed of video and audio signals, status and / or diagnostic code signals and an identification code assigned to each TV camera 10 or 12 is received from the TV camera 10 via the video signal transmission line 16T. 9 is transmitted.
[0065]
As shown in FIG. 15, the fiber transmitter 6 includes a known light emitting diode or laser 33, a phototransistor or pin diode 31, a prism or an optical fiber cable splitter that directs the optical path toward the light emitting diode 33 and the pin diode 31, and the like. The filter 30 is optically connected to the optical fiber connector 17 that employs the known optical splitter, thereby realizing the known bidirectional optical signal propagation through the optical fiber connector 17. The light emitting diode 33 generates an optical signal having a wavelength different from the reception wavelength of the pin diode. The light emitting diode generates an optical signal having a wavelength of 1300 nm or 1550 nm, for example, and the pin diode receiving wavelength is 850 nm.
[0066]
Since the filter 30 is an optical filter through which an optical signal having a wavelength corresponding to the wavelength of the pin diode 31 passes, only the control and external synchronization signals propagated from the reception controllers 9, 11, and 90 reach the pin diode 31. No external synchronization and / or control signals are interfered by stray or return video signals.
[0067]
Instead of the above, two unidirectional optical fiber cables are adopted via two separate optical fiber connectors 17, one connector 17 directly receives an optical signal from the light emitting diode 33, and the other optical fiber connector 17 receives light. A signal may be directly supplied to the pin diode 31. In this configuration, the optical divider and the filter 30 are not necessary, and the wavelengths of both signals may be the same.
[0068]
The video signal supplied through the transmission line 16T via the connector 1 passes through the control signal clipper 35 and the external synchronization signal clipper 25, and reaches the video driver 34 that supplies the video drive signal to the light emitting diode 33.
[0069]
Video driver 34 is a known fiber optic video driver that processes analog video drive signals or converts video signals into amplitude modulated (AM) or frequency modulated (FM) video drive signals to drive light emitting diodes 33. . However, if the level of the external synchronization signal combined with the video signal and propagated through the transmission lines 16R and 16T is higher than the level of the video signal, an analog signal drive error occurs if the external synchronization signal is included on the input side of the video driver 34. When the video driver 34 employs a frequency modulator, a frequency modulation error occurs and the optical signal is overdriven or distorted. Therefore, it is preferable to remove the external synchronization signal from the video signal supplied to the video driver 34. As will be described later, it is desirable to remove the external synchronization signal in order to prevent a closed signal loop.
[0070]
The fiber receiver 8 shown in FIG. 16 includes a known light emitting diode or laser 23, a phototransistor or pin diode 21, and a known prism or optical fiber cable splitter that directs the optical path toward the light emitting diode 23 and the pin diode 21. And a filter 20 optically connected to an optical fiber connector 15 that employs an optical splitter, thereby realizing well-known bidirectional optical signal propagation via the optical fiber connector 15. The light emitting diode 23 generates an optical signal having a wavelength different from the reception wavelength of the pin diode. The diode generates an optical signal having a wavelength of 850 nm, for example, and the pin diode receiving wavelength may be 1300 nm or 1550 nm.
[0071]
Since the filter 20 is an optical filter through which an optical signal having a wavelength equal to the wavelength of the pin diode 21 passes, only the video signal propagating from the TV camera 10 or 12 reaches the pin diode 21, and the video signal is externally synchronized and / or Or, it is not affected by floating or reflecting control signals.
[0072]
Instead of the above, two unidirectional optical fiber cables via two separate optical fiber connectors 15 are adopted, one optical fiber connector 15 supplies an optical signal to the pin diode 21, and the other connector 15 emits light. An optical signal may be directly received from the diode 23. In this configuration, the optical divider and the filter 20 are not required, and the wavelengths of both signals may be the same.
[0073]
Since the description of the preferred embodiment relates to a bidirectional optical signal propagating in a single fiber optic cable and the wavelength of the bidirectional signal at the fiber transmitter and fiber receiver must be reciprocal, In the description, a wavelength of 1300 nm is used for video optical signals, and an optical signal wavelength of 850 nm is used for external synchronization and / or control signals.
[0074]
Therefore, in the following description, the light emitting diode 33, the filter 20 and the pin diode 21 all have a wavelength of 1300 nm, and the light emitting diode 23, the filter 30 and the pin diode 31 all have a wavelength of 850 nm.
[0075]
The control and external synchronization signal driver 24 of FIG. 16 is a well-known fiber optical signal driver, which converts a pulse or analog drive signal into a processed or amplitude-modulated (AM) or frequency-modulated (FM) drive signal to produce a light-emitting diode. 23 is driven.
[0076]
The fiber transmitter 6 and the fiber receiver 8 are connected via an optical fiber cable 15, the wavelength of the optical signal generated by the light emitting diode 23 is 850 nm, and the filter 30 and the diode of the fiber transmitter 6 of FIG. Since the optical wavelengths of 31 are opposite, the external synchronization and / or control signal emitted from the light emitting diode 23 reaches the pin diode 31 of FIG.
[0077]
Similarly, the multiplexed video signal having a signal wavelength of 1300 nm emitted from the light emitting diode 33 reaches the pin diode 21 of FIG. 16 via the filter 20 and realizes known optical fiber bidirectional signal propagation.
[0078]
The input side of the comparison circuit 62 in FIG. 16 is connected to the line 28L, supplied with the video signal mixed with the external synchronization signal present on the transmission line 16R, and the comparator 62 of the TV camera 10 separates the external synchronization signal. In the same manner as described above, the external synchronization signal is separated from the video signal by comparing the mixed signal with a predetermined reference signal or voltage 60.
[0079]
Similarly, the control code extractor 76A extracts a control signal from the composite signal supplied from the line 28L. Referring to FIG. 13, the control code extractor 76A includes a synchronization signal separation circuit 82 that separates a horizontal synchronization signal and a vertical synchronization signal from a video signal, a counter 84 that counts the number of horizontal scanning lines in each field or frame, When the value counted by the counter 84 is equal to a predetermined value, the gate circuit 86 outputs a video signal only during the period, and the code signal is reproduced by detecting the envelope or level of the output signal of the gate circuit 86. Level sensor 88. The counter 84 also supplies a clipping pulse CP4 that activates the control signal clipper 35 of the fiber receiver 8 of FIG.
[0080]
Since the timing incidence of the external synchronization signal is different from the timing of the control signal, they do not interfere with each other when the separated external synchronization signal and control signal are supplied to the control and external synchronization driver 24.
[0081]
Further, the external synchronization signal level is higher than the video signal level, and the maximum level of the control signal is the white signal level of the video signal that is the maximum level of the video signal in FIG. Thus, the control and external synchronization driver 24 supplies the light emitting diode 23 with two different levels of signal to emit two different optical signals that are separated in time.
[0082]
Since the control signal is reinjected into the video line of the fiber transmitter 6, the received signal including the reinjection control signal is fed back to the input side of the control code extractor 76A and the video line 28L to prevent oscillation. It is necessary to remove the reinjection control signal from
[0083]
The gate 86 of the control code extractor 76A of FIG. 13 is output during the specific predetermined horizontal period of the control signal injected by the reception controller 9 or 90 while the gate outputs a composite signal to the level sensor 88. Is supplied with a clipping pulse CP4. The clipping pulse CP4 of FIG. 11D is supplied to the control signal clipper 35 of FIG. 16 only during the period to drive the control signal clipper 35, and all the control signals reinjected into the fiber transmitter 6 are clipped. Removed. FIG. 11D shows a clipping pulse CP4 having a period of one horizontal scanning cycle, and FIG. 11E shows a signal clipped on the output side of the control signal clipper 35. Yes. However, when the control signal generated by the reception controller 9, 11 or 90 is injected into the video signal during the corresponding several horizontal periods, the predetermined period of the clipping pulse CP4 is a period of the plurality of periods.
[0084]
In FIG. 15, the fiber transmitter 6 includes a control signal clipper 35 and an external synchronization signal clipper 25 for removing control and an external synchronization signal from the input of the video driver 34 and the light emitting diode 33, and the emitted light. Remove control and / or external synchronization signals from the signal to prevent closed signal loops. Therefore, the optical signal that reaches the optical fiber receiver 8 via the optical fiber cable 15 does not include external synchronization or control signal components. In any case, along the elements connected to the optical fiber line and the transmission line, including the reception controller and the TV camera, so that a residual closed signal loop or a signal error does not occur when setting the connection between the optical fiber line and the transmission line. It is desirable to introduce a control signal and external sync signal clipping circuit.
[0085]
Referring to the fiber receiver 8 of FIG. 16, the external synchronization clipper 25 is similar to the external synchronization clipping circuit 38 of the reception controller 9 of FIG. 7 and removes the residual external synchronization signal from the output connector 28.
[0086]
The optical signal reaching the known pin diode 21 converts the optical signal into an electrical signal and supplies this electrical signal to the input side of the video processor 22. The video processor 22 employs an analog amplifier when the optical signal supplied via the optical fiber cable 15 is an analog signal or an amplitude modulation signal, and the optical signal supplied via the optical fiber cable 15 is frequency-modulated. If the signal is an FM signal, an FM modulator circuit is employed.
[0087]
Video processor 22 further comprises a known small signal transimpedance amplifier and an output video amplifier for outputting video signals. The output video signal is supplied to the video output connector 28 via the external synchronization clipper 25 and the control signal clipper 35.
[0088]
As described above, the fiber receiver 8 of FIG. 16 extracts the external synchronization signal and control signal from the signal present at the output connector 28, and reinjects this extracted signal into the fiber optic connector 27 to disturb the video signal. Instead, the external synchronization signal and / or control signal is propagated in the direction opposite to the propagation of the video signal, and the optical fiber line and the transmission line are connected through a common connector that carries the bidirectional signal.
[0089]
15 extracts the external synchronization signal and / or control signal propagated by the optical fiber cable 15 via the output connector 17, and uses this extracted signal without disturbing the propagation of the video signal. Re-injection into the input connector 18 in the direction opposite to the propagation of the video signal, thereby connecting the optical fiber line and the transmission line via a common connector that carries bidirectional signals.
[0090]
FIG. 8 shows a reception controller for processing an optical video signal through an optical connector 27, a filter 20, a pin diode 21 and a video processor 22 in a manner in which the fiber receiver 8 processes the optical video signal. 11. The external synchronization signal and / or control signal is supplied directly from the external synchronization generator 44 and the control signal gate 54 to the control and external synchronization driver 24, making it unnecessary to use the fiber receiver 8 of FIG. However, the fiber transmitter 6 is directly connected to the reception controller 11 via the optical fiber cable 15, and means for reinjecting the external synchronization and / or control signal into the transmission line 16 T connecting the fiber transmitter and the TV camera 10. May be provided.
[0091]
Each of the receivers 9, 11, and 90 shown in FIGS. 7, 8, and 17 includes a control signal clipping circuit 57 that clips the residual control signal from the video signal. It is not re-entered at the input of the code extractor and no code extraction error occurs. The control signal clipping circuit 57 is activated by the output of the synchronization counter 52 and operates in the same manner as the control signal clipper 35 of FIG.
[0092]
FIG. 17 shows a receiver 90 including a selector switch 91 that selectively connects a plurality of TV cameras 10 or 12. When the plurality of TV cameras 10 or 12 are selectively connected to the reception controller 90 via the selector switch 91, all the internal synchronization generators 64 of the plurality of TV cameras 10 or 12 shown in FIGS. It is desirable to synchronize and lock each other to prevent interference from switching or selecting from one TV camera to the other TV camera.
[0093]
The external synchronization generator 44 is a method in which the reception controllers 9 and 11 in FIGS. 7 and 8 inject external synchronization signals into individual transmission lines or optical fiber cables, and through the buffer 36 and the connector 16. Is supplied to the transmission line 16R and supplied to the optical fiber cable 15 via the buffer 36A and the control and external synchronization driver 24.
[0094]
The control signal generated by the control generator 49 of FIG. 17 is injected into the transmission line 16L via the buffer 56 in the manner in which the buffer 56 of the reception controller 9 of FIG. The gate 54 of the controller 11 is supplied directly from the gate 54 to the control and external synchronization driver 24 in the manner of supplying a control signal.
[0095]
The switch 91 of FIG. 17 is a single pole rotary switch, but may be an electrical switch, for example, an analog IC switch or matrix IC switch or other electrical or mechanical switch or combination of switches. The output pole of the switch outputs a video signal having no control or external sync signal remaining via the control signal clipping circuit 57 and the sync pulse clipping circuit 38 via the line 16S. If a large number of transmission lines 16R are connected to the input poles of the switch 91 of the reception controller 90, the output of the buffer 56 can be connected to the line 16S instead of being connected to the negative poles, and the control signal can be selectively transmitted to the TV camera. Can be supplied to.
[0096]
In addition, the control signal can be supplied in parallel to a large number of n poles of the switch 91 via a large number of buffers 56. By combining the recognition of the selectively connected camera and the control code, each TV camera 10 or 12 can be controlled at the same time as confirmation, and the control signal is made parallel to all the TV cameras 10 or 12. Can be supplied at once. Further, since only the TV camera selected via the switch 91 has an ID that is extracted by the code extractor 76 and mixed into the control command via the control signal generator 50, the mixed code is shown in FIGS. When compared with the TV camera identification code by the TV camera code comparison circuit 78, the only TV camera 10 or 12 responds to the control signal.
[0097]
The TV camera 12 of FIG. 10 is optically connected to an optical fiber connector 17 that employs a known light-emitting diode or laser 33, a phototransistor or pin diode 31, and a known optical splitter similar to the fiber transmitter 6. And a connected filter 30. Similarly, the video driver 34, the external synchronization and control signal processor 32, the control code extractor 77, the comparison circuit 36, and the reference power supply 39 are all circuits similar to the circuit of the fiber transmitter 6, and the fiber transmission It is connected internally as in the case of the circuit of the machine 6.
[0098]
The comparison circuit 36 supplies the external synchronization pulse P3 to the control code extractor 77 shown in FIGS. In FIG. 14, a pulse P3 is supplied to the input of an occurrence and duration timer 85 to generate a predetermined gate pulse having a delay and a duration, and the time and timing at which the control signal is generated. The gate 87 is operated only for a predetermined duration of the horizontal line corresponding to. The control signal is supplied to the level sensor 88 from the line 32L via the gate 87 in the configuration as described with respect to the control code extractors 76 and 76A. Similarly, the control code extractor 77 supplies the H and V signals to the occurrence and duration timer 85 instead of P3 by connecting to the video line via the sync separation circuit 82 as shown in FIG. Is done. The occurrence and duration timer 85 outputs the clipping pulse CP5 and drives the control signal clipper of the fiber receiver 6 of FIG.
[0099]
Thus, the external synchronization and / or control signal propagates through the fiber optic cable between the fiber optic transmitter 6 and the reception controller 11 or 90. The fiber optic transmitter 6 injects external synchronization and / or control signals. The transmission line 16T connects the TV camera 10 and the fiber transmitter 6, and propagates bidirectional signals, that is, a video signal from the TV camera 10 to the fiber transmitter 6 and the TV camera 10 via the common connector 16 or 18. Propagate synchronization and / or control signals towards
[0100]
Also, the optical fiber cable 15 that carries the video signal generated by the TV camera 12 to the reception controller 9 via the fiber receiver propagates the external synchronization and / or control signal to the TV camera 12, and the external synchronization and / or The control signal is injected by the reception controller 9 or 90 into the transmission line 16R that connects the fiber receiver 8 and the reception controller 9 or 90 with the common connectors 16 and 28.
[0101]
Similarly, the TV camera 12 uses a single fiber optic cable 15 that propagates bi-directional signals, i.e., video signals going to the reception controller 11 or 90 and external synchronization and / or control signals going to the TV camera 12. Connected to the reception controller 11 or 90. The TV camera takes out the external synchronization pulse and the control code via the comparison circuit 36 and the control code extractor 77, respectively. The clipping circuits 57 and 38 of the reception controller 11 or 90 remove residual reflection signals to prevent closed signal loops and / or output signal level errors.
[0102]
The external synchronization and control signal clipping circuits in the present application are independent circuits, but can also be used as a single clipping circuit, such as P3 and CP5 in FIG. 15, P3 and CP4 in FIG. 7, and two clipping pulses such as the output signal of the synchronization counter 52 are combined and supplied to a single clipping circuit to clip both the external synchronization and control signals.
[0103]
Referring to FIGS. 7, 8 and 17, each external synchronization generator 44 of the reception controller 9, 11 or 90 includes a plurality of reception controllers 9, 11 of a monitoring system employing a large number of receivers. Alternatively, a master external synchronization signal is supplied to drive 90 in synchronization.
[0104]
Similarly, the synchronization drive signal output from the reception controller 9 in FIG. 7 to the control and external synchronization driver 24 in FIG. 16 via the connector 44A is replaced with the connector 44B in place of the extracted external synchronization signal supplied from the comparison circuit 62. By supplying via the control, the control and the external synchronization driver 24 can be driven in synchronization. Further, the control signal output from the reception controller 9 of FIG. 7 via the connector 49A is supplied to the control and external synchronization driver 24 of FIG. 16 via the connector 49B instead of the output signal of the control code extractor 76A. You can also Thereby, the TV camera 10 and the fiber transmitter 6 are connected via the transmission line 16T and the common connectors 16 and 18, and the fiber receiver 8 is connected to the connectors 44B, 49B and 28 of FIG. It is connected to the reception controller 9 via the individual connectors 44A, 49B and 16 in FIG.
[0105]
Furthermore, the TV camera of FIG. 9 can be connected to the fiber transmitter 6 of FIG. 15 via individual connectors 16, 18, 44C and 49C, and the video signal via the transmission line 16T and the connectors 16 and 18; In addition, external synchronization and / or control signals are provided via the individual connectors 44C and 49C. Accordingly, the TV camera 10 is connected to an optical fiber line, and the fiber receiver 8 in FIG. 16 supplies a video signal to the transmission line 16R and extracts and extracts an external synchronization and / or control signal from the transmission line 16R. The transmission line 16R is connected to the reception controller 9 or 90 via the common connectors 16 and 28, by performing bidirectional signal processing such as reinjecting the received signal into the optical fiber connector 27.
[0106]
If the individual connectors between the TV camera 10 of FIG. 9 and the fiber transmitter 6 of FIG. 15 are used, the illustrated control signal injector 37 and external synchronization signal injector 38 are not required. Similarly, the control code extractor 76, the comparison circuit 62, and the reference voltage source 60 of FIG. 9 are not necessary.
[0107]
As is apparent from the above, the entire system shown in FIGS. 1 to 5 can be connected, and can be applied partially or as a whole system. In any system configuration, at least a part of the line has a common connector. Can be connected through. Furthermore, the closed loop signal does not affect the recombined bidirectional signal.
[0108]
The present invention can be applied not only to an information transmission line and an optical fiber line device used in a monitoring system, but also to other information propagation devices.
[0109]
Needless to say, the above disclosure relates only to a preferred embodiment of the present invention, and suggests that the present disclosure covers modifications, and that these modifications do not depart from the scope and spirit of the present invention. Like.
[Brief description of the drawings]
FIG. 1 is a block diagram of an optical fiber line connecting device according to a preferred embodiment of the present invention.
FIG. 2 is a block diagram of an optical fiber line connecting device according to a preferred embodiment of the present invention.
FIG. 3 is a block diagram of an optical fiber line connecting device according to a preferred embodiment of the present invention.
FIG. 4 is a block diagram of an optical fiber line connecting device according to a preferred embodiment of the present invention.
FIG. 5 is a block diagram of an optical fiber line connecting device according to a preferred embodiment of the present invention.
6 is a waveform diagram of a signal transmitted by the apparatus of FIGS. 1 to 5. FIG.
7 is an electric circuit block diagram showing a receiving device of a preferred embodiment of the device shown in FIGS. 2 and 3. FIG.
8 is a modified block diagram of the electrical circuit of FIG. 7 that provides a connector for connecting an optical fiber cable to the receiver of the preferred embodiment.
9 is an electrical circuit block diagram showing a TV camera of a preferred embodiment of the apparatus of FIGS. 1, 3 and 5; FIG.
FIG. 10 is a modified block diagram of the electrical circuit of FIG. 9 providing a connector for connecting an optical fiber cable to the transmitter of the preferred embodiment.
FIG. 11 is a waveform diagram of an identification code signal and its clipping circuit.
12 is a block diagram of a code extraction circuit of a preferred embodiment of the receiving device of FIG. 7 and the TV camera of FIG. 9;
13 is a block diagram of a code extraction circuit in the preferred embodiment of the fiber receiver of FIG.
14 is a block diagram of a code extraction circuit of a preferred embodiment of the modification of the TV camera of FIG. 10 and the fiber transmitter of FIG. 15;
FIG. 15 is a block diagram of a fiber transmitter for connecting an optical fiber cable to an information transmission line according to a preferred embodiment of the present invention.
FIG. 16 is a block diagram of a fiber receiver that connects an optical fiber cable to an information transmission line in a preferred embodiment of the present invention.
FIG. 17 is an electric circuit block diagram of a receiving apparatus including a selector as another preferred embodiment in the apparatus of FIG. 5;
[Explanation of symbols]
1, 2, 3, 4, 5. . . Information transmission system
6). . . Fiber transmitter
7). . . Fiber receiver
8). . . Fiber receiver
9. . . Reception controller
10. . . TV camera
11. . . Reception controller
12 . . TV camera
15. . . Fiber optic cable
16. . . Transmission line connector
16L. . . Video track
16R. . . Transmission line
16T. . . Transmission line
17. . . connector
18. . . connector
20. . . filter
21. . . Pin diode
22. . . Video processor
23. . . Light emitting diode
24. . . Control and external synchronization signal driver
25. . . External sync signal clipper
27. . . connector
28. . . connector
28L. . . line
30. . . filter
31. . . Pin diode
32. . . External synchronization and control signal processor
32L. . . line
33. . . Light emitting diode
34. . . Video driver
35. . . Control signal clipper
36. . . Buffer circuit Comparison circuit
37. . . Control signal injector
38. . . Sync pulse clipping circuit External sync signal injector
39. . . Reference power supply
41. . . Output connector
42. . . Audio decoder
42A. . . Audio output connector
44. . . External synchronization generator
44A. . . connector
44B. . . connector
46. . . Sync separation circuit
47. . . Control signal generator
49A. . . connector
49B. . . connector
50. . . Control signal generation circuit
52. . . counter
53. . . Gate circuit
56. . . Buffer circuit
57. . . Control signal clipping circuit
60. . . Reference voltage source
62. . . Voltage comparator
64. . . Internal sync signal generation circuit
66. . . Video signal generation circuit
68. . . Audio signal generation circuit
70. . . Audio signal injection circuit
72. . . Identification code setting circuit
74. . . Identification code injection circuit
76. . . Control code extractor
76A. . . Control code extractor
77. . . Control code extractor
78. . . Identification code comparison circuit
80. . . decoder
82. . . Sync signal separation circuit
84. . . counter
85. . . Occurrence and duration timer
86. . . Gate circuit
87. . . Gate
88. . . Level sensor
90. . . Reception controller and selector
91. . . selector switch
P1. . . External sync pulse
P2. . . Pulse signal
P3. . . External sync pulse
CP4. . . Clipping pulse
CP5. . . Clipping pulse
Vw. . . White level of video signal
Vb. . . Black level
H. . . Horizontal sync signal Internal sync signal
V. . . Vertical sync signal Internal sync signal

Claims

An optical fiber line composed of one or more optical fiber cables and an optical fiber receiver carries information signals and bidirectional signals propagating in one direction from the transmitter to the receiver via the optical fiber receiver. Optical fiber connection method for connecting an optical fiber line to an information transmission line carrying a bidirectional signal connected to a transmission line carrying an external synchronization signal propagating in the reverse direction from the receiver to the transmitter via a common connector A pulse signal having a voltage level higher than the maximum voltage level of the information signal or lower than the minimum voltage level by using a blanking portion of the information signal, and passing through the transmission line to the optical fiber. Transmitting to the receiver as an external synchronization signal, the pulse signal transmitted through the transmission line, the transmission signal as a reference of a predetermined level Separating from the information signal by comparing with a signal or voltage, converting the separated pulse signal into an optical signal, and propagating the optical signal to the transmitter via the one or more optical fiber cables An optical fiber connection method for connecting an optical fiber line to an information transmission line carrying a bidirectional signal.

A clipping pulse that matches the duration of the pulse signal from the information signal propagated from the transmitter to the receiver is included in the fiber optic receiver and / or the receiver and / or the transmitter. The connection method according to claim 1, further comprising the step of removing the pulse signal by adding to a clipping circuit, thereby preventing a closed loop signal and / or signal error.

2. The connection method according to claim 1, wherein the information signal is a composite video signal or a digital video signal.

The connection method according to claim 3, wherein the polarity of the pulse signal is opposite to that of an internal synchronization signal included in each of the information signals.

4. The connection method according to claim 3, wherein the information signal is mixed with an audio signal.

The connection method according to claim 3, wherein the information signal includes an identification signal related to the transmitter.

The connection method according to claim 3, wherein the information signal includes status and / or diagnostic data related to the transmitter.

The connection method according to claim 5, wherein the information signal further includes an identification signal related to the transmitter.

The connection method according to claim 5 or 8, wherein the information signal further includes status and / or diagnostic data relating to the transmitter.

An optical fiber line composed of one or more optical fiber cables and an optical fiber transmitter carries an information signal and a bidirectional signal propagating in one direction from the transmitter to the receiver via the optical fiber transmitter. An optical fiber line to an information transmission line carrying a bidirectional signal connected to a transmission line carrying an external synchronization signal propagating in the reverse direction from the receiver to the transmitter via the optical fiber transmitter via a common connector In the optical fiber connection method of connecting the optical fiber, the step of receiving an optical signal transmitted to the optical fiber transmitter via the one or more optical fiber cables as an external synchronization signal, and the received optical signal, Converting the information signal into a pulse signal having a voltage level higher than the maximum voltage level or lower than the minimum voltage level; and retrace of the information signal Appending the pulse signal to the transmission line to propagate the pulse signal as an external synchronization signal to the transmitter by using a leaving portion, and carrying information in a bidirectional signal An optical fiber connection method for connecting an optical fiber line to a transmission line.

From the information signal propagated from the transmitter to the receiver, a clipping pulse that matches the duration of the pulse signal is included in the fiber optic transmitter and / or the receiver and / or the transmitter. The method according to claim 10, further comprising the step of removing the pulse signal by adding to a clipping circuit, thereby preventing a closed loop signal and / or an error.

Separating the pulse signal propagated through the transmission line from the information signal by comparing the bidirectional signal with a reference signal or voltage at a predetermined level, and supplying the separated pulse signal to the transmitter The connection method according to claim 10, further comprising the step of:

The connection method according to claim 10, wherein the information signal is a composite video signal or a digital video signal.

11. The connection method according to claim 10, wherein the polarity of the pulse signal is opposite to that of an internal synchronization signal included in each of the information signals.

14. The connection method according to claim 13, wherein the information signal is mixed with an audio signal.

The connection method according to claim 13, wherein the information signal includes an identification signal related to the transmitter.

The connection method according to claim 13, wherein the information signal includes status and / or diagnostic data relating to the transmitter.

The connection method according to claim 15, wherein the information signal further includes an identification signal related to the transmitter.

The connection method according to claim 15 or 18, wherein the information signal further includes status and / or diagnostic data relating to the transmitter.

An optical fiber line composed of one or more optical fiber cables and an optical fiber receiver carries a video signal and a bidirectional signal propagating in one direction from the transmitter to the receiver via the optical fiber receiver. In an optical fiber connection method for connecting an optical fiber line to an information transmission line carrying a bidirectional signal connected to a transmission line carrying a control signal propagating in the reverse direction from the receiver to the transmitter via a common connector Generating a control signal during one or more predetermined horizontal scan periods of the video signal and supplying it to the fiber optic receiver via the transmission line during a vertical blanking portion of the video signal; The video signal propagated through the transmission line from the video signal by detecting an envelope of the control signal during the one or more horizontal scan periods of the video signal; A bidirectional signal comprising the steps of: separating the control signal; and converting the separated control signal into an optical signal and sending it to the transmitter toward the one or more optical fiber cables. An optical fiber connection method for connecting an optical fiber line to an information transmission line that transports the optical fiber.

From the video signal propagated from the transmitter to the receiver, a clipping pulse that matches the one or more predetermined horizontal scanning periods of the video signal is transmitted to the fiber optic receiver and / or the receiver and / or 21. The connection method according to claim 20, further comprising the step of removing the control signal by adding to a clipping circuit included in the transmitter, thereby preventing closed loop signals and / or signal errors.

The connection method according to claim 21, wherein the video signal is a composite video signal or a digital video signal.

The connection method according to claim 21, wherein the video signal is mixed with an audio signal.

The connection method according to claim 21, wherein the video signal includes an identification signal related to the transmitter.

The connection method according to claim 21, wherein the video signal includes status and / or diagnostic data relating to the transmitter.

The connection method according to claim 23, wherein the video signal further includes an identification signal related to the transmitter.

27. A connection method according to claim 23 or claim 26, wherein the video signal further comprises status and / or diagnostic data relating to the transmitter.

An optical fiber line composed of one or more optical fiber cables and an optical fiber transmitter is used to transmit a video signal and a bidirectional signal propagating in one direction from the transmitter to the receiver via the optical fiber transmitter. To an information transmission line carrying a bidirectional signal connected to a transmission line carrying a control signal propagating in the opposite direction from the receiver toward the transmitter via the optical fiber transmitter via a common connector carrying In an optical fiber connection method for connecting optical fiber lines, an optical signal is transmitted as a control signal of the transmitter via the one or more optical fiber cables during one or more predetermined horizontal scanning periods of the video signal. And injecting the control signal into the transmission line during the one or more predetermined horizontal scanning periods of a vertical blanking portion of the video signal. An optical fiber line connected to an information transmission line for carrying a bidirectional signal, the method comprising: receiving the transmission optical signal to convert the control signal to the transmitter and converting it to the control signal; Optical fiber connection method.

From the video signal propagated from the transmitter to the receiver, a clipping pulse that matches the one or more predetermined horizontal scanning periods of the video signal is transmitted to the fiber optic transmitter and / or the receiver and / or 29. The connection method according to claim 28, further comprising removing the control signal by adding to a clipping circuit included in the transmitter, thereby preventing a closed loop signal and / or signal error.

The connection method according to claim 28, wherein the video signal is a composite video signal or a digital video signal.

31. The connection method according to claim 30, wherein the video signal is mixed with an audio signal.

The connection method according to claim 30, wherein the video signal includes an identification signal related to the transmitter.

31. The connection method according to claim 30, wherein the video signal includes status and / or diagnostic data relating to the transmitter.

32. The connection method according to claim 31, wherein the video signal further includes an identification signal related to the transmitter.

38. A connection method according to claim 31 or 37, wherein the video signal further comprises status and / or diagnostic data relating to the transmitter.

An optical fiber line composed of one or more optical fiber cables, one end terminated with an optical fiber receiver and the other end terminated with an optical fiber transmitter, between the first and second portions of the transmission line, A receiver connected to the optical fiber receiver via the first part of the transmission line and a common connector; and a receiver connected to the optical fiber transmitter via the second part of the transmission line and a common connector. Inserted with the transmitter, propagates the information signal from the transmitter to the receiver in one direction, and transmits an external synchronization signal from the receiver to the transmitter via the common connector that carries a bidirectional signal. In an optical fiber connection method for connecting an optical fiber line to an information transmission line that carries a bidirectional signal that propagates in the opposite direction and inserts the optical fiber line, the maximum voltage level of the information signal is A pulse signal having a voltage level higher than or lower than a minimum voltage level as an external synchronization signal by using a blanking portion of the information signal via the first portion of the transmission line. Transmitting to the receiver and from the information signal by comparing the pulse signal transmitted via the first part of the transmission line with a reference signal or voltage of a predetermined level. Separating the separated pulse signal into an optical signal and sending it to the optical fiber transmitter via the one or more optical fiber cables; receiving the optical signal; and Re-converted into a pulse signal having a voltage level higher than the maximum voltage level or lower than the minimum voltage level, and transmitting the re-converted pulse signal to the transmission Injecting into the second part of the path and propagating the reconverted pulse signal as an external synchronization signal toward the transmitter via the transmission line by using a blanking portion of the information signal; An optical fiber connection method for connecting an optical fiber line to an information transmission line carrying a bidirectional signal.

From the information signal propagated from the transmitter to the receiver, a clipping pulse that matches the duration of the pulse signal is sent to the optical fiber receiver and / or the optical fiber transmitter and / or the receiver and / or The connection method according to claim 36, further comprising the step of removing the pulse signal by adding to a clipping circuit included in the transmitter, thereby preventing a closed loop signal and / or signal error. .

The connection method according to claim 36, wherein the information signal is a composite video signal or a digital video signal.

The connection method according to claim 38, wherein the pulse signal has a polarity opposite to an internal synchronization signal included in each of the information signals.

39. A connection method according to claim 38, wherein the information signal is mixed with an audio signal.

The connection method according to claim 38, wherein the information signal includes an identification signal related to the transmitter.

39. The connection method according to claim 38, wherein the information signal includes status and / or diagnostic data relating to the transmitter.

41. The connection method according to claim 40, wherein the information signal further includes an identification signal related to the transmitter.

44. A connection method according to claim 40 or claim 43, wherein the information signal further comprises status and / or diagnostic data relating to the transmitter.

An optical fiber line composed of one or more optical fiber cables, one end terminated with an optical fiber receiver and the other end terminated with an optical fiber transmitter, between the first and second portions of the transmission line, A receiver connected to the optical fiber receiver via the first part of the transmission line and a common connector; and a receiver connected to the optical fiber transmitter via the second part of the transmission line and a common connector. Inserted with the transmitter, propagates the information signal from the transmitter to the receiver in one direction, and carries an external synchronization signal from the receiver to the transmitter via the common connector carrying a bidirectional signal. In an optical fiber connection method for connecting an optical fiber line to an information transmission line that carries a bidirectional signal that propagates in the opposite direction and inserts the optical fiber line, one or more of the video signals Generating a control signal during a constant horizontal scan period and supplying it to the fiber optic receiver via the first portion of the transmission line during a vertical blanking portion of the video signal; Separating the control signal propagated via the transmission line from the video signal by detecting an envelope of the control signal during one or more horizontal scanning periods; and optically separating the separated control signal. Converting the signal into a signal through the one or more optical fiber cables and sending the signal to the optical fiber transmitter; receiving the transmitted optical signal and reconverting it into the control signal; A step of propagating the control signal to the transmission line by injecting the control signal into the transmission line during the one or more predetermined horizontal scanning periods of the vertical blanking portion of When the connection method of optical fiber connecting the optical fiber lines to the information transmission line carrying bidirectional signals, characterized in that it comprises a.

From the video signal propagated from the transmitter to the receiver, a clipping pulse that matches the one or more predetermined horizontal scanning periods of the video signal is transmitted to the optical fiber receiver and / or the optical fiber transmitter, and The method further comprises the step of removing the control signal by adding to a clipping circuit included in the receiver and / or the transmitter, thereby preventing closed loop signals and / or signal errors. Item 46. The connection method according to Item 45.

46. The connection method according to claim 45, wherein the video signal is a composite video signal or a digital video signal.

48. A connection method according to claim 47, wherein the video signal is mixed with an audio signal.

The connection method according to claim 47, wherein the video signal includes an identification signal related to the transmitter.

48. The connection method according to claim 47, wherein the information signal includes status and / or diagnostic data relating to the transmitter.

49. The connection method according to claim 48, wherein the video signal further includes an identification signal related to the transmitter.

52. A connection method according to claim 48 or 51, wherein the information signal further comprises status and / or diagnostic data relating to the transmitter.

An optical fiber line composed of one or more optical fiber cables and an optical fiber receiver carries video signals and bidirectional signals propagating in one direction from the transmitter to the receiver via the optical fiber receiver. An optical fiber line is connected to an information transmission line carrying an external synchronization signal propagating in the reverse direction from the receiver to the transmitter and a transmission line carrying a control signal via a common connector. In the optical fiber connection method, a pulse signal having a voltage level higher than the maximum voltage level or lower than a minimum voltage level of the video signal and the control signal having a predetermined voltage level different from the pulse signal level are generated. The control signal generated during one or more predetermined horizontal scans of the video signal is supplied to the transmission line at different and different times. And supplying the pulse signal to the optical fiber receiver through the transmission line by using a vertical blanking portion of the video signal, and the control signal propagated through the transmission line and the Comparing the propagation signal with a reference signal or voltage at a predetermined level, and time gating and detecting the envelope of the control signal during the one or more predetermined horizontal scan periods of the video signal, Separating from the video signal, converting the separated control signal and pulse signal into an optical signal, and sending the optical signal to the transmitter via the one or more optical fiber cables; An optical fiber connection method for connecting an optical fiber line to an information transmission line carrying a bidirectional signal.

From the information signal propagated from the transmitter to the receiver, a clipping pulse that matches the duration of the pulse signal and the control signal is sent to the optical fiber receiver and / or the receiver and / or the transmitter. 54. The method of claim 53 further comprising the step of removing the pulse signal and the control signal by adding to one or more clipping circuits included in to prevent closed loop signals and / or signal errors. The connection method described.

54. The connection method according to claim 53, wherein the video signal is a composite video signal or a digital video signal.

56. The connection method according to claim 55, wherein the pulse signal has a polarity opposite to an internal synchronization signal included in each of the video signals.

56. A connection method according to claim 55, wherein the video signal is mixed with an audio signal.

56. The connection method according to claim 55, wherein the video signal includes an identification signal related to the transmitter.

56. The connection method according to claim 55, wherein the video signal includes status and / or diagnostic data relating to the transmitter.

58. The connection method according to claim 57, wherein the video signal further includes an identification signal related to the transmitter.

61. The connection method according to claim 57 or 60, wherein the video signal further includes status and / or diagnostic data relating to the transmitter.

An optical fiber line composed of one or more optical fiber cables and an optical fiber transmitter is used to transmit a video signal and a bidirectional signal propagating in one direction from the transmitter to the receiver via the optical fiber transmitter. Information carrying a bidirectional signal connected to a transmission line carrying an external synchronization signal and a control signal propagating in the reverse direction from the receiver toward the transmitter through the optical fiber transmitter through a common connector to be carried In an optical fiber connection method for connecting an optical fiber line to a transmission line, two different levels of a first level and time occurrence for the external synchronization signal and a second level and time occurrence for the control signal And receiving an optical signal sent via the one or more optical fiber cables to the optical fiber transmitter configured with time generation; The received first level and time generation optical signal is a pulse signal having a voltage level higher than the maximum voltage level or lower than the minimum voltage level of the video signal, and the second level and time generation optical signal is the control signal. Converting during one or more predetermined horizontal scanning periods of the video signal, supplying the converted pulse signal and the control signal to the transmission line, and using a vertical blanking portion of the video signal Propagating the pulse and the control signal to the transmitter as an external synchronization signal and a control signal, and an optical fiber connection method for connecting an optical fiber line to an information transmission line carrying a bidirectional signal .

From the video signal propagated from the transmitter to the receiver, a clipping pulse that matches the time and duration of the pulse signal and the control signal is sent to the fiber optic transmitter and / or the receiver and / or the 63. The method of claim 62, further comprising removing the pulse signal and the control signal by adding to a clipping circuit included in a transmitter to prevent closed loop signals and / or signal errors. Connection method.

The connection method according to claim 62, wherein the video signal is a composite video signal or a digital video signal.

The connection method according to claim 64, wherein the polarity of the pulse signal is opposite to that of an internal synchronization signal included in each of the video signals.

65. A connection method according to claim 64, wherein the video signal is mixed with an audio signal.

The connection method according to claim 64, wherein the video signal further includes an identification signal related to the transmitter.

The connection method according to claim 64, wherein the video signal includes status and / or diagnostic data relating to the transmitter.

The connection method according to claim 66, wherein the video signal further includes an identification signal related to the transmitter.

70. A connection method according to claim 66 or 69, wherein the video signal further comprises status and / or diagnostic data relating to the transmitter.

An optical fiber line composed of one or more optical fiber cables, one end terminated with an optical fiber receiver and the other end terminated with an optical fiber transmitter, between the first and second portions of the transmission line, A receiver connected to the optical fiber receiver via the first part of the transmission line and a common connector and a transmission connected to the optical fiber transmitter via the second part of the transmission line and a common connector Inserted into the receiver, propagates a video signal in one direction from the transmitter to the receiver, and carries an external synchronization signal and a control signal from the receiver to the transmitter via the common connector that carries a bidirectional signal. In the method of connecting an optical fiber, an optical fiber line is connected to an information transmission line that carries a bidirectional signal that propagates in the opposite direction toward A pulse signal as the external synchronization signal having a voltage level higher than the maximum voltage level of the signal or lower than the minimum voltage level; and the pulse signal level generated during one or more predetermined horizontal scanning periods of the video signal; Two separate signals with the control signal having different predetermined voltage levels, which are supplied to the fiber optic receiver through the transmission line by using a vertical blanking portion of the video signal. Generating two signals and supplying the pulse signal and the control signal to the first portion of the transmission line at different times; and transmitting the control signal and the pulse signal propagated through the transmission line to the propagation Comparing the signal with a reference signal or voltage at a predetermined level and the control signal during the one or more predetermined horizontal scans of the video signal. Separating from the video signal by time gating and detecting an entanglement, converting the separated pulse signal and the control signal into an optical signal, and transmitting the optical fiber via the one or more optical fiber cables A second level and time occurrence for the control signal, and a second level and time occurrence for the control signal, and a second level and time occurrence for the control signal. Receiving the optical signal, and converting the received first level and time generation optical signal into a pulse signal having a voltage level higher than a maximum voltage level of the video signal or lower than a minimum voltage level; A signal is converted into the control signal during one or more predetermined horizontal scanning periods of the video signal, and the converted pulse signal and And supplying the control signal to the transmission line and using the vertical blanking portion of the video signal to propagate to the transmitter as an external synchronization signal and a control signal. An optical fiber connection method for connecting an optical fiber line to an information transmission line for carrying a signal.

From the video signal propagated from the transmitter to the receiver, a clipping pulse that matches the time and duration of the pulse signal and the control signal is sent to the optical fiber receiver and / or the optical fiber transmitter and / or Or further comprising removing the pulse signal and the control signal by adding to one or more clipping circuits included in the receiver and / or the transmitter, thereby preventing closed loop signals and / or signal errors. The connection method according to claim 71, wherein:

72. The connection method according to claim 71, wherein the video signal is a composite video signal or a digital video signal.

72. The connection method according to claim 71, wherein the polarity of the pulse signal is opposite to that of an internal synchronization signal included in each of the video signals.

74. A connection method according to claim 73, wherein the video signal is mixed with an audio signal.

74. The connection method according to claim 73, wherein the video signal includes an identification signal related to the transmitter.

74. The connection method according to claim 73, wherein the video signal includes status and / or diagnostic data related to the transmitter.

The connection method according to claim 75, wherein the video signal further includes an identification signal related to the transmitter.

79. A connection method according to claim 75 or claim 78, wherein the video signal further comprises status and / or diagnostic data relating to the transmitter.

An information signal propagating in one direction from the transmitter to the receiver via one or more optical fiber cables and an optical fiber receiver, and the transmitter from the receiver via a common connector carrying a bidirectional signal An optical fiber receiver for connecting the one or more optical fiber cables to a transmission line carrying an external synchronization signal propagating in the opposite direction toward the optical fiber, via the one or more optical fiber cables A circuit that receives an optical information signal from the transmitter and converts the optical information signal into an electrical signal, processes the electrical signal into the information signal, and outputs the information signal to the transmission line via the common connector Before being supplied from the receiver through the transmission line via the common connector as an external synchronization signal during the duration of the circuit and the blanking portion of the information signal Extracting a pulse signal having a voltage level higher than the maximum voltage level of the information signal or lower than the minimum voltage level, and separating the pulse signal from the information signal by comparing the bidirectional signal with a reference signal or voltage of a predetermined level A circuit that processes the separated pulse signal, and a circuit that converts the processed pulse signal into an optical signal and sends it to the transmitter via the one or more optical fiber cables; A receiving apparatus comprising:

The circuit further comprises a circuit for clipping the pulse signal from the information signal supplied to the common connector by adding a clipping pulse that matches the time and duration of the pulse signal, thereby providing a closed loop signal and / or signal error The receiving apparatus according to claim 80, wherein the receiving apparatus is prevented.

The receiving apparatus according to claim 81, wherein the information signal is a composite video signal or a digital video signal.

The receiving apparatus according to claim 82, wherein the pulse signal has a polarity opposite to that of an internal synchronization signal included in each of the information signals.

83. The receiving device according to claim 82, wherein the information signal is mixed with an audio signal.

The receiving apparatus according to claim 82, wherein the information signal includes an identification signal related to the transmitter.

83. The receiving device according to claim 82, wherein the information signal includes status and / or diagnostic data relating to the transmitter.

The receiving apparatus according to claim 84, wherein the information signal further includes an identification signal related to the transmitter.

88. A receiving device according to claim 84 or 87, wherein the information signal further comprises status and / or diagnostic data relating to the transmitter.

The one or more optical fiber cables are connected to a transmission line that carries an information signal in one direction from the transmitter to the receiver via an optical fiber transmitter and one or more optical fiber cables, and bidirectional signals are transmitted. An optical fiber transmitter for propagating an external synchronization signal supplied from the receiver via the optical fiber cable and the optical fiber transmitter in the opposite direction toward the transmitter via a common connector to be conveyed. A circuit for receiving an information signal from the transmitter via the transmission line and the common connector, and converting the received information signal into an optical signal and sending it to the receiver via the one or more optical fiber cables And an optical external synchronization signal received from the receiver via the one or more optical fiber cables, and the received optical external synchronization signal A circuit for converting into an electric signal and the electric signal are processed into a pulse signal having a voltage level higher than the maximum voltage level or lower than the minimum voltage level of the information signal, and the pulse signal is used as an external synchronization signal to return the information signal. And a circuit for supplying the transmission line via the common connector during a line erasure portion continuation period.

A clipping circuit for clipping the pulse signal from the information signal supplied to the received information signal conversion circuit by adding a clipping pulse that matches the time and duration of the pulse signal; 90. The transmission apparatus according to claim 89, wherein a signal error is prevented.

90. The transmission apparatus according to claim 89, wherein the information signal is a composite video signal or a digital video signal.

92. The transmission apparatus according to claim 91, wherein the pulse signal has a polarity opposite to that of an internal synchronization signal included in each of the information signals.

92. The transmission apparatus according to claim 91, wherein the information signal is mixed with an audio signal.

92. The transmission apparatus according to claim 91, wherein the information signal includes an identification signal related to the transmitter.

92. The transmission apparatus according to claim 91, wherein the information signal includes status and / or diagnostic data relating to the transmitter.

94. The transmission apparatus according to claim 93, wherein the information signal further includes an identification signal related to the transmitter.

97. The transmitting apparatus according to claim 93 or 96, wherein the information signal further includes status and / or diagnostic data relating to the transmitter.

A video signal propagating in one direction from the transmitter to the receiver via one or more optical fiber cables and an optical fiber receiver, and the transmitter to the transmitter via a common connector carrying a bidirectional signal An optical fiber receiver for connecting the one or more optical fiber cables to a transmission line carrying a control signal propagating in the opposite direction toward the transmitter, wherein the transmitter is connected via the one or more optical fiber cables. A circuit for receiving an optical video signal from the optical signal, converting the optical video signal into an electric signal, a circuit for converting the electric signal into the video signal, and outputting the video signal to the transmission line via the common connector; Generated by the receiver during one or more predetermined horizontal scan periods and via the common connector during the duration of the vertical blanking portion. Extracting the control signal supplied to the fiber optic receiver through a line, and time gating and detecting the envelope of the control signal during the one or more predetermined horizontal scan periods of the video signal. A circuit for separating the control signal propagated from the video signal through the transmission line, a circuit for processing the separated control signal, and the separated control signal into an optical signal to convert the one or more lights And a circuit for sending the signal to the transmitter via a fiber cable.

And further comprising a circuit for clipping the control signal from the video signal supplied to the common connector by adding a clipping pulse that matches the one or more predetermined horizontal scanning periods of the video signal. 99. The receiving apparatus according to claim 98, wherein a signal and / or signal error is prevented.

99. The receiving apparatus according to claim 98, wherein the video signal is a composite video signal or a digital video signal.

The receiving apparatus according to claim 100, wherein the video signal is mixed with an audio signal.

The receiving apparatus according to claim 100, wherein the video signal includes an identification signal related to the transmitter.

The receiving apparatus according to claim 100, wherein the video signal includes status and / or diagnostic data relating to the transmitter.

The receiving apparatus according to claim 101, wherein the video signal further includes an identification signal related to the transmitter.

105. The receiving device according to claim 101 or 104, wherein the video signal further comprises status and / or diagnostic data relating to the transmitter.

The one or more optical fiber cables are connected to a transmission line that carries a video signal in one direction from the transmitter to the receiver via an optical fiber transmitter and one or more optical fiber cables. In an optical fiber transmission device for propagating a control signal supplied via the optical fiber cable and the optical fiber transmitter in the opposite direction from the receiver to the transmitter via a common connector for carrying, A circuit for receiving a video signal from the transmitter via the transmission line and the common connector and the received video signal are converted into an optical signal and transmitted to the receiver via the one or more optical fiber cables. A circuit for receiving an optical control signal from the receiver via the one or more optical fiber cables and converting it into an electrical signal; The electrical signal is processed into the control signal during one or more predetermined horizontal scanning periods of the video signal, and the control signal is passed through the common connector during the duration of the blanking portion of the video signal. And a circuit for supplying to the transmitter.

A circuit for clipping the control signal from the video signal supplied to the received video signal conversion circuit by adding a clipping pulse that matches the one or more predetermined horizontal scanning periods of the video signal; 107. The transmission apparatus of claim 106, thereby preventing closed loop signals and / or signal errors.

The transmission apparatus according to claim 106, wherein the video signal is a composite video signal or a digital video signal.

109. The transmission apparatus of claim 108, wherein the video signal is mixed with an audio signal.

The transmission apparatus according to claim 108, wherein the video signal includes an identification signal related to the transmitter.

109. The transmission apparatus of claim 108, wherein the video signal includes status and / or diagnostic data related to the transmitter.

110. The transmitter of claim 109, wherein the video signal further includes an identification signal for the transmitter.

113. Transmitting apparatus according to claim 109 or 112, wherein the video signal further comprises status and / or diagnostic data relating to the transmitter.

From the receiver to the transmitter via a common connector carrying a video signal and a bidirectional signal propagated in one direction from the transmitter to the receiver via one or more optical fiber cables and an optical fiber receiver. An optical fiber receiver that connects the one or more optical fiber cables to a transmission line carrying external synchronization signals and control signals propagating in opposite directions, wherein the transmission is performed via the one or more optical fiber cables. A circuit for receiving an optical video signal from a device and converting it into an electrical signal, a circuit for processing the electrical signal into the video signal and outputting it to the transmission line via the common connector, and two separate signals. A search circuit for searching for the control signal generated by the receiver and the external synchronization signal. A pulse signal having a voltage level higher than a maximum voltage level of the video signal or lower than a minimum voltage level, and the control signal has a predetermined voltage level different from the pulse signal level and is generated from the pulse signal at a different time. The control signal is generated during one or more predetermined horizontal scanning periods of the video signal, and the pulse signal and the control signal are generated during a duration of a vertical blanking portion of the video signal. Supplied to the optical fiber receiver via the transmission line, the search circuit comparing the bidirectional signal with a signal or voltage at a predetermined level and the one or more predetermined horizontal scanning periods of the video signal. Time pulse and control signal from the video signal by time gating and detecting the control signal envelope Apart, the receiving apparatus characterized by the separated the pulse signal and the control signal is converted into an optical signal further includes a circuit for sending towards said transmitter via said one or more optical fiber cables.

One or more clipping circuits that clip the pulse signal and the control signal from the video signal supplied to the common connector by adding a clipping pulse that matches the time and duration of the pulse signal and the control signal 115. The receiver of claim 114, further comprising: preventing closed-loop signals and / or signal errors.

The receiving apparatus according to claim 114, wherein the video signal is a composite video signal or a digital video signal.

117. The receiving apparatus according to claim 116, wherein the pulse signal has a polarity opposite to that of an internal synchronization signal included in each of the video signals.

117. The receiver according to claim 116, wherein the video signal is mixed with an audio signal.

117. The receiving device according to claim 116, wherein the video signal includes an identification signal for the transmitter.

117. The receiving device according to claim 116, wherein the video signal includes status and / or diagnostic data relating to the transmitter.

119. The receiver of claim 118, wherein the video signal further comprises an identification signal for the transmitter.

122. Receiving device according to claim 118 or 121, wherein the video signal further comprises status and / or diagnostic data relating to the transmitter.

The one or more optical fiber cables are connected to a transmission line that carries the video signal in one direction from the transmitter to the receiver via one or more optical fiber cables and an optical fiber transmitter, and the bidirectional signal An optical fiber transmitter for propagating an external synchronization signal and a control signal supplied in the opposite direction from the receiver to the transmitter via the optical fiber cable and the optical fiber transmitter via a common connector A circuit for receiving a video signal from the transmitter via the transmission line and the common connector, and converting the received video signal into an optical signal to the receiver via the one or more optical fiber cables. The receiver via the one or more fiber optic cables consisting of a sending circuit and two separate signals A circuit for receiving an optical external synchronization and control signal and a circuit for processing the electrical signal into two separate signals, the external synchronization signal being higher than a maximum voltage level of the video signal or above a minimum voltage level. A pulse signal having a low voltage level, and the control signal is a signal having a predetermined voltage level different from the pulse signal level and is generated at a time separate from the pulse signal, and the control signal is The electrical signal processing circuit is generated during one or more predetermined horizontal scan periods of the video signal, and the electrical signal processing circuit applies the pulse to the transmission line via the common connector during the duration of a vertical blanking portion of the video signal. A transmission device characterized by supplying a signal and the control signal.

One for clipping the external synchronization signal and the control signal from the video signal supplied to the received video signal conversion circuit by adding a clipping pulse that matches the time and duration of the pulse signal and the control signal 124. The transmission apparatus according to claim 123, further comprising the above clipping circuit, thereby preventing a closed loop signal and / or a signal error.

124. The transmission apparatus according to claim 123, wherein the video signal is a composite video signal or a digital video signal.

126. The transmission apparatus according to claim 125, wherein the pulse signal has a polarity opposite to that of an internal synchronization signal included in each of the video signals.

126. The transmission apparatus of claim 125, wherein the video signal is mixed with an audio signal.

126. The transmission device of claim 125, wherein the video signal includes an identification signal for the transmitter.

126. The transmission device of claim 125, wherein the video signal includes status and / or diagnostic data related to the transmitter.

128. The transmission apparatus of claim 127, wherein the video signal further includes an identification signal for the transmitter.

131. Transmitting apparatus according to claim 127 or 130, wherein the video signal further comprises status and / or diagnostic data relating to the transmitter.

One or more optical fiber cables having one end connected to an optical fiber receiver and the other end connected to an optical fiber transmitter, the first and second portions of the transmission line are connected to the first of the transmission line. A receiver connected to the fiber optic receiver via a part and a common connector, and a transmitter connected to the fiber optic transmitter via the second part of the transmission line and the common connector; An optical fiber that propagates an information signal in one direction from the transmitter to the receiver and an external synchronization signal in the opposite direction from the receiver to the transmitter via the common connector carrying a bidirectional signal. In the system, a circuit for receiving an information signal from the transmitter via the second portion of the transmission line and the common connector, and the received information signal as an optical signal An optical fiber transmitter comprising a circuit that converts and sends the optical fiber to the optical fiber receiver via the one or more optical fiber cables; and the optical fiber via the one or more optical fiber cables. A circuit for receiving an optical external synchronization signal from a receiver and converting the optical external synchronization signal into an electrical signal and a pulse having a voltage level higher than a maximum voltage level or lower than a minimum voltage level of the information signal; A circuit for processing the pulse signal as an external synchronization signal through the common connector and supplying the pulse signal to the second part of the transmission line during the duration of the blanking part of the information signal; A circuit for receiving an optical information signal from the optical fiber transmitter via an optical fiber cable and converting the optical information signal into an electrical signal; and processing the electrical signal into the information signal A circuit for outputting the information signal to the first portion of the transmission line via the common connector; and the return of the information signal during the blanking elimination duration of the information signal as the external synchronization signal via the common connector Extracting a pulse signal having a voltage level higher than or lower than a maximum voltage level of the information signal supplied from the receiver through a first portion and comparing the bidirectional signal with a reference signal of a predetermined level; A circuit for separating the pulse signal from the information signal, a circuit for processing the separated pulse signal, and converting the processed pulse signal into an optical signal via the one or more optical fiber cables. And an optical fiber system for sending out to the optical fiber transmitter.

One or more clipping the pulse signal from the information signal processed by the fiber optic transmitter and / or the fiber optic receiver by providing a clipping pulse that matches the time and duration of the pulse signal 135. The fiber optic system of claim 132, further comprising circuitry to prevent closed loop signals and / or signal errors.

135. The fiber optic system of claim 132, wherein the information signal is a composite video signal or a digital video signal.

135. The optical fiber system of claim 134, wherein the polarity of the pulse signal is opposite to that of an internal synchronization signal included in each of the information signals.

135. The fiber optic system of claim 134, wherein the information signal is mixed with an audio signal.

135. The fiber optic system of claim 134, wherein the information signal includes an identification signal for the transmitter.

135. The fiber optic system of claim 134, wherein the information signal includes status and / or diagnostic data related to the transmitter.

136. The fiber optic system of claim 136, wherein the information signal further comprises an identification signal for the transmitter.

140. The fiber optic system of claim 136 or claim 139, wherein the information signal further comprises status and / or diagnostic data relating to the transmitter.

One or more optical fiber cables having one end connected to an optical fiber receiver and the other end connected to an optical fiber transmitter, the first and second portions of the transmission line are connected to the first of the transmission line. Connected together with a receiver connected to the fiber optic receiver via a part and a common connector and a transmitter connected to the fiber optic transmitter via the second part of the transmission line and the common connector; Propagate video signals in one direction from the transmitter to the receiver and control signals in the opposite direction from the receiver to the transmitter via the common connector carrying bidirectional signals In an optical fiber system, a circuit for receiving a video signal from the transmitter via the second portion of the transmission line and the common connector, and the received video signal as an optical signal An optical fiber transmitter configured to convert the optical signal into an optical signal and send the converted optical signal to the optical fiber receiver via the one or more optical fiber cables; and the one or more optical fibers A circuit for receiving an optical control signal from the fiber optic receiver via a cable and converting the optical control signal into an electrical signal, and the electrical signal during the one or more predetermined horizontal scanning periods of the video signal; A circuit for supplying the pulse signal as an external synchronization signal to the second portion of the transmission line via the common connector during a blanking portion continuation period of the information signal, and the one or more light A circuit for receiving an optical video signal from the optical fiber transmitter via a fiber cable, converting the optical video signal into an electrical signal, and converting the electrical signal into the video signal; A circuit for outputting the video signal to the first portion of the transmission line via the common connector; and the video signal generated by the receiver during one or more predetermined horizontal scanning periods of the video signal, Extracting the control signal supplied to the fiber optic receiver through the first portion of the transmission line via the common connector during the duration of the vertical blanking portion of the signal; A circuit that separates the control signal propagated through the transmission line from the video signal by time-gating and detecting the envelope of the control signal during the predetermined horizontal scanning period; and processing the separated control signal And a circuit that converts the processed control signal into an optical signal and sends it to the optical fiber transmitter via the one or more optical fiber cables. Optical fiber system, wherein Rukoto.

Clipping the control signal from the video signal processed by the fiber optic transmitter and / or the fiber optic receiver by adding a clipping pulse that matches the one or more predetermined horizontal scan periods of the video signal 142. The fiber optic system of claim 141, further comprising one or more circuits that prevent closed loop signals and / or signal errors.

142. The fiber optic system of claim 141, wherein the video signal is a composite video signal or a digital video signal.

145. The fiber optic system of claim 143, wherein the video signal is mixed with an audio signal.

144. The fiber optic system of claim 143, wherein the video signal includes an identification signal for the transmitter.

144. The fiber optic system of claim 143, wherein the video signal includes status and / or diagnostic data related to the transmitter.

145. The fiber optic system of claim 144, wherein the video signal further comprises an identification signal associated with the transmitter.

148. The fiber optic system of claim 144 or 147, wherein the video signal further includes status and / or diagnostic data regarding the transmitter.

One or more optical fiber cables having one end connected to an optical fiber receiver and the other end connected to an optical fiber transmitter, the first and second portions of the transmission line are connected to the first of the transmission line. Connected together with a receiver connected to the fiber optic receiver via a part and a common connector and a transmitter connected to the fiber optic transmitter via the second part of the transmission line and the common connector; The common connector carrying a video signal in one direction from the transmitter to the receiver, an external synchronization signal and a control signal in the opposite direction from the receiver to the transmitter, and a bidirectional signal; An optical fiber system propagating through a circuit for receiving a video signal from the transmitter via the second portion of the transmission line and the common connector; An optical fiber transmitter configured to convert the video signal into an optical signal and send the converted optical signal to the optical fiber receiver via the one or more optical fiber cables; Receive optical external synchronization and control signals consisting of two separate optical signals from the fiber optic receiver via the above fiber optic cable and convert the two separate optical signals into two separate electrical signals And a circuit for processing the electrical signal into two separate signals, and the external synchronization signal is a pulse signal having a voltage level that is higher than a maximum voltage level of the video signal or lower than a minimum voltage level; The control signal has a predetermined voltage level different from the pulse signal level and is generated at a different time from the pulse signal. The control signal is generated during one or more predetermined horizontal scan periods of the video signal, and the electrical signal processing circuit is connected via the common connector during a vertical blanking portion duration of the video signal. Supplying the pulse signal and the control signal to the second portion of the transmission line and receiving an optical video signal from the fiber optic transmitter via the one or more fiber optic cables; An optical fiber receiver comprising: a circuit for converting the electrical signal into an electrical signal; and a circuit for processing the electrical signal into the video signal and outputting the video signal to the second portion of the transmission line via the common connector And an extraction circuit for extracting the control signal generated by the receiver composed of two separate signals and the external synchronization signal, and the external synchronization signal The pulse signal having a voltage level higher than the maximum voltage level or lower than the minimum voltage level of the video signal, the control signal having a predetermined voltage level different from the pulse signal level, and the pulse signal The signals are generated at different times, the control signal is generated during one or more predetermined horizontal scan periods of the video signal, and the pulse signal and the control signal are Being fed to the optical fiber receiver via the first portion of the transmission line during a line erasure portion duration, comparing the bidirectional signal with a reference signal or voltage of a predetermined level, By detecting and gating the envelope of the control signal during the one or more predetermined horizontal scanning periods, the extraction circuit can detect whether the video signal is the video signal. Separating the pulse signal and the control signal, converting the separated pulse signal and the control signal into an optical signal, and transmitting the optical signal to the optical fiber via the one or more optical fiber cables. An optical fiber system comprising a circuit for sending out to a machine.

The pulse signal and the control from the video signal processed by the optical fiber transmitter and / or the optical fiber receiver by adding a clipping pulse that matches the time and duration of the pulse signal and the control signal. 150. The fiber optic system of claim 149, further comprising one or more circuits for clipping the signal, thereby preventing closed loop signals and / or signal errors.

150. The fiber optic system of claim 149, wherein the video signal is a composite video signal or a digital video signal.

The optical fiber system according to claim 151, wherein the pulse signal has a polarity opposite to that of an internal synchronization signal included in each of the video signals.

152. The fiber optic system of claim 151, wherein the video signal is mixed with an audio signal.

152. The fiber optic system of claim 151, wherein the video signal includes an identification signal for the transmitter.

152. The fiber optic system of claim 151, wherein the video signal includes status and / or diagnostic data related to the transmitter.

154. The fiber optic system of claim 153, wherein the video signal further comprises an identification signal associated with the transmitter.

157. The fiber optic system of claim 153 or claim 156, wherein the video signal further includes status and / or diagnostic data relating to the transmitter.

The transmitter is a TV camera, a circuit for processing a video signal generated by the TV camera, and the processed video signal is converted into an optical signal, and the optical signal is transmitted through the one or more optical fiber cables. A circuit for sending a signal to the optical fiber receiver, and a circuit for receiving an optical external synchronization signal from the optical fiber receiver via the one or more optical fiber cables and converting the optical external synchronization signal into an electrical signal And processing the electrical signal into a pulse signal having a voltage level higher than the maximum voltage level or lower than the minimum voltage level of the information signal, and using the pulse signal as an external synchronization signal, the blanking portion duration of the information signal 90. The transmission apparatus according to claim 89, further comprising a circuit for supplying the TV camera to the TV camera.

159. The transmitter of claim 158, wherein the video signal is a composite video signal or a digital video signal.

160. The transmission apparatus according to claim 159, wherein the pulse signal has a polarity opposite to that of an internal synchronization signal included in each of the video signals.

160. The transmission apparatus according to claim 159, wherein the TV camera has a circuit for injecting an audio signal, and the video signal is mixed with the audio signal.

160. The transmission apparatus according to claim 159, wherein the TV camera has a circuit for injecting an identification signal, and the video signal includes an identification signal related to the TV camera.

166. The method of claim 162, wherein the identification signal injection circuit is used to inject status and / or diagnostic data signals for the TV camera and the video signal includes status and / or diagnostic data for the TV camera. Transmitter device.

The transmission apparatus according to claim 161, wherein the TV camera has a circuit for injecting an identification code signal, and the video signal further includes an identification signal related to the TV camera.

166. The transmission apparatus according to claim 163, wherein the TV camera has a circuit for injecting an audio signal, and the video signal is mixed with the audio signal.

166. The transmitter of claim 165, wherein the video signal further comprises identification and / or status and / or diagnostic data related to the TV camera.

The transmitter is a TV camera, the optical fiber receiver converts a video signal generated by the TV camera and a processed video signal into an optical signal, and the optical signal is converted into the receiver. And a circuit for receiving an optical control signal from the receiver, converting the optical control signal into an electrical signal, and converting the electrical signal into the control signal during one or more predetermined horizontal periods of the video signal. treated, transmit device according to the control signal during blanking portions duration of the video signal to claim 89, characterized by further including a circuit for supplying to said TV camera.

Send apparatus of claim 167, wherein the video signal is characterized in that it is a composite video signal or a digital video signal.

It said TV camera has an audio signal injection circuit, the transmit device of claim 168, wherein the video signal is characterized in that it is mixed with the audio signal.

The TV camera has an identification signal injection circuit, the transmit device of claim 168, wherein the video signal is characterized in that it comprises an identification signal relating to the TV camera.

It said TV camera has an identification code signal injection circuit, the transmit device of claim 169, wherein the video signal further comprises an identification signal relating to the TV camera.

171. The 170 of claim 170, wherein the identification signal injection circuit is used to inject status and / or diagnostic data signals for the TV camera and the video signal includes status and / or diagnostic data for the TV camera. send apparatus.

It said TV camera has an audio signal injection circuit, the transmit device of claim 172, wherein the video signal is characterized in that it is mixed with the audio signal.

It said video signal transmit device of claim 173, further comprising identifying and / or conditions and / or diagnostic data relating to the TV camera.

The transmitter is a TV camera, the optical fiber receiver converts a video signal generated by the TV camera and a processed video signal into an optical signal, and the optical signal is converted into the receiver. And an optical external synchronization and control signal composed of two separate optical signals via the one or more fiber optic cables and the two separate optical signals. And a circuit for converting the electrical signal into two separate signals, wherein the external synchronization signal is higher than a maximum voltage level of the video signal or lower than a minimum voltage level. A pulse signal having a voltage level, wherein the control signal has a different predetermined voltage level separate from the pulse signal level and at a different time different from the pulse signal. One or more predetermined horizontal scans of the video signal for supplying the pulse signal and the control signal to the TV camera during a vertical blanking portion duration of the video signal. send apparatus according to claim 106, characterized in that it is produced during the period.

Send apparatus of claim 175, wherein said video signal is a composite video signal or a digital video signal.

Send apparatus of claim 176, wherein the internal synchronization signal and the polarity of the pulse signal is included in each of the video signal is reversed.

It said TV camera has an audio signal injection circuit, the transmit device of claim 176, wherein the video signal is characterized in that it is mixed with the audio signal.

The TV camera has an identification signal injection circuit, the transmit device of claim 176, wherein the video signal is characterized in that it comprises an identification signal relating to the TV camera.

179. The identification signal injection circuit of claim 176, wherein the identification signal injection circuit is used for injection of status and / or diagnostic data signals relating to the TV camera, and wherein the video signal includes status and / or diagnostic data relating to the TV camera. send apparatus.

It said TV camera has an identification code signal injection circuit, the transmit device of claim 178, wherein the video signal further comprises an identification signal relating to the TV camera.

It said TV camera has an audio signal injection circuit, the transmit device of claim 180, wherein the video camera is characterized in that it is mixed with the audio signal.

It said video signal transmit device of claim 182, further comprising identifying and / or conditions and / or diagnostic data relating to the TV camera.

The optical fiber receiver receives an optical information signal from the optical fiber transmitter or the transmitter via the one or more optical fiber cables, and converts the optical information signal into an electrical signal and the electrical signal And a pulse signal having a voltage level higher than the maximum voltage level or lower than the minimum voltage level of the information signal as an external synchronization signal during the blanking portion continuation period of the information signal. A circuit for processing the pulse signal and the processed pulse signal into an optical signal, via the one or more optical fiber cables during a blanking portion duration of the information signal rECEIVER according to claim 80, characterized by further including a circuit for sending the optical signal to the optical fiber transmitter or the transmitter.

And further comprising a clipping circuit for clipping the pulse signal from the information signal supplied from the transmitter or the fiber optic transmitter by adding a clipping pulse that matches the time and duration of the pulse signal. receiving apparatus according to claim 184, characterized in that to prevent the signal and / or signal error.

Receiving apparatus according to claim 184, wherein the information signal is characterized in that it is a composite video signal or a digital video signal.

Receiving apparatus according to claim 186, wherein the internal synchronization signal and the polarity of the pulse signal is included in each of the information signal is reversed.

Wherein the information signal is mixed with the audio signal, receiving apparatus according to claim 186, wherein the receiver further includes an audio extraction circuit for outputting the audio signal.

The optical fiber receiver receives an optical video signal from the optical fiber transmitter or a TV camera via the one or more optical fiber cables, and converts the optical video signal into an electric signal and the electric signal. A circuit for processing and outputting a video signal; a circuit for generating a control signal during one or more predetermined horizontal scanning periods of the video signal; a circuit for processing the control signal; and the processed control signal as an optical signal And a circuit for transmitting the optical signal to the optical fiber transmitter or the TV camera via the one or more optical fiber cables during a vertical blanking continuation period of the video signal. receiving apparatus according to claim 114, characterized in that it comprises.

A clipping circuit for clipping the control signal from the video signal supplied from the transmitter or the fiber optic transmitter by adding a clipping pulse that matches the one or more predetermined horizontal periods of the video signal; wherein, with reception apparatus according to claim 189, characterized in that to prevent a closed loop signal and / or signal errors.

Receiving apparatus according to claim 189, wherein said video signal is a composite video signal or a digital video signal.

It said video signal is mixed with the audio signal, receiving apparatus according to claim 191, wherein the receiver further includes an audio extraction circuit for outputting the audio signal.

It said video signal includes an identification signal for said transmitter, receiver apparatus according to claim 191, wherein the receiver further comprises a circuit for extracting the identification signal.

Receiving apparatus according to claim 193, wherein the control signal generating circuit generates a combined control signal by synthesizing said control signal to said extraction identification signal.

It said video signal is mixed with the audio signal, receiving apparatus according to claim 194, wherein the receiver further includes an audio extraction circuit for outputting the audio signal.

The optical fiber receiver receives an optical video signal from the optical fiber transmitter or a TV camera via the one or more optical fiber cables, and converts the optical video signal into an electric signal and the electric signal. A circuit that processes and outputs a video signal; a circuit that generates the external synchronization signal and the control signal; and a pulse in which the external synchronization signal has a voltage level higher or lower than a maximum voltage level of the video signal. The control signal is a signal having a predetermined voltage level different from the pulse signal level and generated at a different time different from the pulse signal, and the control signal is the video signal. The pulse signal and the control signal are generated during one or more predetermined horizontal scan periods, and the vertical feedback of the video signal. Generated during an erasure portion duration, converting the pulse signal and the control signal into an optical signal, and passing through the one or more optical fiber cables during a vertical blanking portion duration of the video signal. receiving apparatus according to claim 184, wherein the further comprising a circuitry for sending toward the optical signal to the optical fiber transmitter or the TV camera.

Clip the pulse signal and the control signal from the video signal supplied from the transmitter or the fiber optic transmitter by adding a clipping pulse that matches the time and duration of the pulse signal and the control signal further comprising, with reception apparatus according to claim 196, characterized in that to prevent a closed loop signal and / or signal errors clipping circuit.

Receiving apparatus according to claim 196, wherein said video signal is a composite video signal or a digital video signal.

Receiving apparatus according to claim 198, wherein the internal synchronization signal and the polarity of the pulse signal is included in each of the video signal is reversed.

The pulse signal is mixed with the audio signal, receiving apparatus according to claim 198, wherein the receiver further includes an audio extraction circuit for outputting the audio signal.

It said video signal includes an identification signal for said transmitter, receiver apparatus according to claim 198, wherein the receiver further comprises a circuit for extracting the identification signal.

Receiving apparatus according to claim 201, wherein the generating a composite control signal by synthesizing the identification signal and the control signal generating circuit has been extracted said control signal.

It said video signal is mixed with the audio signal, receiving apparatus according to claim 202, wherein the receiver further comprises a circuit for outputting the audio signal.

Via a common connector included in the information signal transmission system, the information signal is directed to the receiver in one direction, the external synchronization signal is directed to the plurality of transmitters in the opposite direction and / or directly to the transmitter, the transmission line and Selectively transmit one of the information signals and / or from one of the information signals for propagation through a fiber optic cable and / or a fiber optic receiver and / or fiber optic transmitter. A pulse signal having a voltage level higher than the maximum voltage level of the information signal or lower than the minimum voltage level is received during the duration of the blanking portion of the information signal in the connected receiving device together with the selector for switching to the other side. A circuit for generating an external synchronization signal and a plurality of input poles, receiving a plurality of information signals from the plurality of transmitters and selectively outputting a single information signal One or more common connectors and / or the optical fiber transmitter and / or the transmission for connecting the optical fiber receiver or the transmitter to the corresponding input electrode in cooperation with the selector circuit and the transmission line, respectively. One or more optical fiber connectors for connecting a machine to the corresponding input electrode, each of the optical fiber connectors connecting one or more optical fiber cables, and the one or more optical fiber cables via the one or more optical fiber cables An optical fiber transmitter or an optical information signal received from the transmitter, a circuit for converting the optical information signal into an electrical signal, the electrical signal is processed into the information signal, and the information signal is input to an input electrode of the selector circuit Providing a circuit for outputting; a circuit for processing the pulse signal; and converting the processed pulse signal into an optical signal; A circuit for transmitting to the optical fiber transmitter or the transmitter via the one or more optical fiber cables during a blanking portion duration of the information signal, and the pulse signal to the one or more And a circuit for supplying the external synchronization signal to the optical fiber receiver and / or the transmitter during a duration of a blanking portion of the information signal.

And further comprising a clipping circuit for clipping the pulse signal from the information signal output from the selector circuit by adding a clipping pulse that matches the time and duration of the pulse signal, and thus a closed loop signal and / or signal error 205. The receiving device according to claim 204, wherein the receiving device is prevented.

205. The receiving apparatus according to claim 204, wherein the information signal is a composite video signal or a digital video signal.

The receiving apparatus according to claim 206, wherein the polarity of the pulse signal is opposite to that of an internal synchronization signal included in each of the information signals.

207. The receiver of claim 206, further comprising an audio extraction circuit in which the information signal is mixed with an audio signal and the receiver outputs the audio signal.

Via a common connector included in the video signal transmission system, the video signal is directed to the receiver in one direction, the control signal is directed to a plurality of transmitters in the opposite direction and / or directly to the transmitter, the transmission line and / or To selectively connect one of the video signals or switch from one of the video signals to the other for propagation through a fiber optic cable, fiber optic receiver and / or fiber optic transmitter. In the receiving device to be connected, a circuit for generating a control signal during one or more predetermined horizontal scanning periods of the video signal, a plurality of input poles, and a plurality of video signals from the plurality of transmitters. And a selector circuit that selectively outputs a single video signal, and the optical fiber receiver or transmitter before corresponding to each of the transmission lines. One or more common connectors connected to the input pole and / or one or more common connectors connecting the optical fiber transmitter or the transmitter to the corresponding input pole, and one or more of each of the optical fiber connectors And an optical video signal is received from the optical fiber transmitter or one of the transmitters via the one or more optical fiber cables, and the optical video signal is converted into an electrical signal. Providing a circuit and a circuit for processing the electrical signal into the video signal and outputting the video signal to an input pole of the selector circuit; and a circuit for processing the control signal and the processed control signal as an optical signal. And converting the optical signal through the one or more optical fiber cables during the duration of the vertical blanking portion of the video signal. And transmitting the control signal to the one or more transmission lines, and transmitting the control signal during the duration of the vertical blanking portion of the video signal. A receiver comprising: a fiber receiver and / or a circuit propagating to the transmitter.

And further comprising a clipping circuit for clipping the control signal from the video signal output from the selector circuit by adding a clipping pulse that matches the one or more predetermined horizontal periods of the video signal. 209. The receiving apparatus according to claim 209, wherein signal errors are prevented.

The receiving apparatus according to claim 209, wherein the video signal is a composite video signal or a digital video signal.

223. The receiver of claim 211, further comprising an audio extraction circuit in which the video signal is mixed with an audio signal and the receiver outputs the audio signal.

223. The receiver of claim 211, wherein the video signal includes an identification signal for the transmitter, and the receiver further includes circuitry for extracting the identification signal.

213. The receiving apparatus according to claim 213, wherein the control signal generation circuit generates a mixed control signal by combining the extracted identification signal with the control signal.

224. The receiver of claim 214, further comprising an audio extraction circuit in which the video signal is mixed with an audio signal and the receiver outputs the audio signal.

Via a common connector included in the video signal transmission system, the video signal is directed to the receiver in one direction, and the external synchronization and control signals are directed to a plurality of transmitters in the opposite direction and / or directly to the transmitter. And / or selectively connect one of the video signals for propagation through a fiber optic cable, fiber optic receiver and / or fiber optic transmitter or from one of the video signals to the other. Together with a selector for switching to a pulse signal having a voltage level higher than the maximum voltage level or lower than the minimum voltage level of the video signal during the duration of the blanking portion of the video signal. A circuit for generating a synchronization signal; a circuit for generating a control signal during one or more predetermined horizontal scanning periods of the video signal; A selector circuit that has a power pole, receives a plurality of video signals from the plurality of transmitters, and selectively outputs a single video signal; and the optical fiber receiver or the transmission in cooperation with the transmission line. One or more common connectors for connecting a machine to the corresponding input pole and / or one or more common connectors for connecting the fiber optic transmitter or the transmitter to the corresponding input pole; and Each connects one or more fiber optic cables and receives an optical video signal from the fiber optic transmitter or one of the transmitters via the one or more fiber optic cables; Providing a circuit for converting into an electric signal and a circuit for processing the electric signal into the video signal and outputting the video signal to an input electrode of the selector circuit; A circuit for processing the pulse signal and the control signal and converting the processed pulse and control signal into an optical signal, the optical signal being converted into the one or more during the duration of the vertical blanking portion of the video signal; A circuit for sending to the optical fiber transmitter or the transmitter via an optical fiber cable, and supplying the pulse signal and the control signal to the one or more transmission lines, and vertical blanking of the video signal; One or more circuits that propagate the external synchronization signal and the control signal to the transmitter and / or the fiber optic receiver during the duration of a portion.

One or more clippings that clip the pulse signal and the control signal from the video signal output from the selector circuit by adding a clipping pulse that matches the time and duration of the pulse signal and the control signal 227. The receiver of claim 216, further comprising a circuit to prevent closed loop signals and / or signal errors.

219. The receiver of claim 216, wherein the video signal is a composite video signal or a digital video signal.

219. The receiving device of claim 218, wherein the polarity of the pulse signal is opposite to that of an internal synchronization signal included in each of the video signals.

219. The receiver of claim 218, further comprising an audio extraction circuit in which the video signal is mixed with an audio signal and the receiver outputs the audio signal.

219. The receiver of claim 218, wherein the video signal includes an identification signal for the transmitter, and the receiver further includes circuitry for extracting the identification signal.

223. The receiving apparatus according to claim 221, wherein the control signal generation circuit generates a mixed control signal by combining the extracted identification signal with the control signal.

223. The receiver of claim 222, further comprising an audio extraction circuit in which the video signal is mixed with an audio signal and the receiver outputs the audio signal.