JPH0759084B2 - Method adaptive image transmission system - Google Patents
Method adaptive image transmission systemInfo
- Publication number
- JPH0759084B2 JPH0759084B2 JP30296187A JP30296187A JPH0759084B2 JP H0759084 B2 JPH0759084 B2 JP H0759084B2 JP 30296187 A JP30296187 A JP 30296187A JP 30296187 A JP30296187 A JP 30296187A JP H0759084 B2 JPH0759084 B2 JP H0759084B2
- Authority
- JP
- Japan
- Prior art keywords
- signal
- format
- ntsc
- circuit
- television
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Color Television Systems (AREA)
- Television Systems (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 この発明は、異標準方式圏間の通信に用いられる画像伝
送システムに関するものである。The present invention relates to an image transmission system used for communication between different standard areas.
第２図は例えば‘画像符号化シンポジウム−第２回シン
ポジウム資料“テレビ会議・テレビ電話用符号化の標準
化動向”大久保栄（NTT）’に示された従来の画像伝送
システムの実施例のブロック図である。図中、（１）は
NTSC用カメラ、（２）はNTSC信号、（３）は符号化装
置、（４）は方式変換部、（５）は符号化部、（６）は
多重化部、（７）は伝送路、（８）は復号化装置、
（９）は分離部、（10）は復号化部、（11）は方式変換
装置、（18）は中間フォーマットフレームメモリ、（1
9）は方式変換読み出し回路、（20）はPAL用アナログ回
路、（21）はPAL信号、（22）はPAL用ディスプレイであ
る。FIG. 2 is a block diagram of an example of a conventional image transmission system shown in, for example, "Image Coding Symposium-2nd Symposium Material" Standardization Trend of Video Conference / Video Phone Coding "Sakae Okubo (NTT)". Is. In the figure, (1) is
NTSC camera, (2) NTSC signal, (3) encoder, (4) format converter, (5) encoder, (6) multiplexer, (7) transmission line, (8) is a decoding device,
(9) is a separation unit, (10) is a decoding unit, (11) is a format conversion device, (18) is an intermediate format frame memory, and (1
9) is a format conversion readout circuit, (20) is a PAL analog circuit, (21) is a PAL signal, and (22) is a PAL display.
次に動作について説明する。NTSC用カメラ（１）はNTSC
信号（２）を出力し、符号化装置（３）内標準方式変換
部（４）はNTSC方式（走査線数が525本／フレーム、フ
ィールド周波数が59.94）を中間フォーマット（１フレ
ームのライン数がＹ＝288、CA＝144、CB＝144、毎秒フ
レーム数29.97）に変換し、符号化部（５）はこの信号
を符号化し、多重化部（６）は画像フレーム同期信号・
符号化モードなどの情報を付加し、伝送路（７）に送信
する。受信側の復号化装置（８）内の分離部（９）は付
加信号とテレビジョン信号を分離し、復号化部（10）は
デビジョン信号を復号化し、方式変換装置（11）内の中
間フォーマット用フレームメモリ（18）に出力する。テ
レビジョン信号はフレームメモリからPAL方式の周期で
読み込まれ、補間フィルタがかけられ、中間フォーマッ
トからPAL方式（走査線数が625本／フレーム、フィール
ド周波数が50）に変換される。PAL信号（21）はPAL用ア
ナログ回路（20）によって増幅・同期され、PAL用ディ
スプレイ（22）に出力される。Next, the operation will be described. NTSC camera (1) is NTSC
The signal (2) is output, and the standard conversion unit (4) in the encoding device (3) uses the NTSC system (the number of scanning lines is 525 lines / frame, the field frequency is 59.94) as an intermediate format (the number of lines in one frame is Y = 288, C A = 144, C B = 144, the number of frames per second 29.97), the encoding unit (5) encodes this signal, and the multiplexing unit (6) converts the image frame synchronization signal
Information such as the encoding mode is added and transmitted to the transmission line (7). The separation unit (9) in the receiving-side decoding device (8) separates the additional signal and the television signal, the decoding unit (10) decodes the division signal, and the intermediate format in the system conversion device (11). Output to the frame memory (18). The television signal is read from the frame memory in the PAL system cycle, subjected to an interpolation filter, and converted from the intermediate format to the PAL system (the number of scanning lines is 625 lines / frame, the field frequency is 50). The PAL signal (21) is amplified and synchronized by the PAL analog circuit (20) and output to the PAL display (22).
従来の画像伝送システムは以上のように構成れているの
で、異標準方式圏間の画像通信においてテレビジョン信
号形式（水平・垂直方向の解像度、単位時間あたりのフ
レーム数）の変換をしなければならず、システムが複雑
になるなどの問題があった。Since the conventional image transmission system is configured as described above, it is necessary to convert the television signal format (horizontal / vertical resolution, the number of frames per unit time) in image communication between different standard systems. However, there was a problem that the system became complicated.
この発明は上記のような問題を解消するためになされた
もので、複雑な方式変換を行わずに簡単に異標準方式圏
間と通信できる画像伝送システムを得ることを目的とす
る。The present invention has been made to solve the above problems, and an object of the present invention is to obtain an image transmission system that can easily communicate between different standard system areas without performing complicated system conversion.
この発明に係る画像伝送システムは、送信側は多重化回
路によってテレビジョン信号に選択信号を付加し受信側
はテレビジョン信号と選択信号を分離する分離回路を持
ち、選択信号によって標準方式を判別し、最多の解像度
の標準化方式に対応できるフレームメモリと、標準化方
式を切り換えられるリード回路、アナログ回路及びディ
スプレイを持ったものである。In the image transmission system according to the present invention, the transmitting side has a separating circuit for adding a selection signal to a television signal by a multiplexing circuit and the receiving side has a separation circuit for separating the television signal and the selection signal, and the standard signal is discriminated by the selection signal. , Which has a frame memory capable of supporting the standardized system of the maximum resolution, a read circuit capable of switching the standardized system, an analog circuit, and a display.
この発明における方式適応型画像伝送システムは次のよ
うに作用する。すなわち、送信側の多重化部によって送
信側のテレビジョン信号形式を示す選択信号を符号化デ
ータに付加して送信し、受信側は受信データに付加され
た選択信号から送信側のテレビジョン信号形式を判別
し、リード回路・アナログ回路・ディスプレイの信号処
理形式を送信側のテレビジョン信号形式に合わせて切り
換え、受信信号を送信側の信号形式で処理する。The system-adaptive image transmission system according to the present invention operates as follows. That is, the multiplexer on the transmitting side adds a selection signal indicating the television signal format on the transmitting side to the encoded data to transmit, and the receiving side selects the television signal format on the transmitting side from the selection signal added to the received data. Then, the signal processing format of the read circuit / analog circuit / display is switched according to the television signal format of the transmitting side, and the received signal is processed in the signal format of the transmitting side.
以下この発明の一実施例を図について説明する。第１図
はこの発明によるNTSC標準方式圏とPAL標準方式圏間の
画像伝送システムの一実施例を示すブロック図である。
図中、（１）はNTSC用カメラ、（２）はNTSC信号、
（３）は符号化装置、（５）は符号化部、（６）は多重
化部、（８）は復号化装置、（９）は分離部、（10）は
復号化部、（12）はフレームメモリ、（13）はNTSC/PAL
切り換え付き読み出し回路、（14）はNTSC/PAL切り換え
付きアナログ回路、（15）はNTSC信号、（16）はNTSC/P
AL切り換え付きディスプレイ、（17）は制御信号であ
る。An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of an image transmission system between the NTSC standard system area and the PAL standard system area according to the present invention.
In the figure, (1) is the camera for NTSC, (2) is the NTSC signal,
(3) is an encoding device, (5) is an encoding unit, (6) is a multiplexing unit, (8) is a decoding device, (9) is a demultiplexing unit, (10) is a decoding unit, (12). Is frame memory, (13) is NTSC / PAL
Readout circuit with switching, (14) NTSC / PAL analog circuit with switching, (15) NTSC signal, (16) NTSC / P
Display with AL switching, (17) is a control signal.
次に動作について説明する。送信側では、NTSC用カメラ
（１）によって出力されたNTSC方式テレビジョ信号
（２）は符号化装置（３）内の符号化部（５）によって
符号化され、符号化データは多重化部（６）によって符
号化モード・フレーム同期信号の他にテレビジョン信号
形式を示す選択信号が付加され、伝送路（７）により受
信側に伝送される。受信側では、復号化装置（８）内の
分離部（９）によって受信データから選択信号を分離
し、選択信号によって送信側の信号形式を判別し、NTSC
/PAL切り換え付き読み出し回路（13）、NTSC/PAL切り換
え付きアナログ回路（14）及びNTSC/PAL切り換え付きデ
ィスプレイ（16）をNTSC方式に切り換える。選択信号を
分離された受信データは復号化部（10）によって復号化
され、水平方向・垂直方向の解像度及び単位時間あたり
のフレーム数が最大となるフォーマットで読み書きでき
る容量を持ったフレームメモリ（12）に書き込まれる。
NTSC/PAL切り換え付き読み出し回路（13）によってNTSC
方式の読み出し周期及び読み出し速度でデータが読み出
され、NTSC/PAL切り換え付きアナログ回路（14）によっ
てNTSC方式の同期信号の波形と周期で同期がとられ、NT
SC/PAL切り換え付きディスプレイ（16）によってNTSC方
式（走査線525本／フレーム、フィルド周波数59.94）で
出力される。Next, the operation will be described. On the transmission side, the NTSC television signal (2) output by the NTSC camera (1) is encoded by the encoding unit (5) in the encoding device (3), and the encoded data is multiplexed ( By 6), a selection signal indicating a television signal format is added in addition to the coding mode / frame synchronization signal, and the signal is transmitted to the receiving side through the transmission line (7). On the reception side, the separation unit (9) in the decoding device (8) separates the selection signal from the received data, and the selection signal determines the signal format on the transmission side.
The readout circuit (13) with / PAL switching, the analog circuit (14) with NTSC / PAL switching, and the display (16) with NTSC / PAL switching are switched to the NTSC system. The received data from which the selection signal has been separated is decoded by the decoding unit (10), and has a frame memory (12 ) Is written.
Read circuit with NTSC / PAL switching (13) by NTSC
Data is read at the read cycle and read speed of the NTSC method, and the analog circuit with NTSC / PAL switching (14) synchronizes with the waveform of the NTSC method sync signal to make the NT
It is output by the NTSC system (525 scanning lines / frame, filled frequency 59.94) by the display (16) with SC / PAL switching.
なお、上記実施例ではNTSC方式圏からPAL方式圏への画
像伝送について示したが、これ以外のSECAMのＢ方式、
Ｄ方式、Ｉ方式、K1方式、Ｌ方式やPALのＢ方式、Ｄ方
式、Ｇ方式、Ｉ方式、Ｎ方式、Ｍ方式などの標準方式間
の画像伝送であってもよく、上記実施例と同様の効果を
奏する。In the above embodiment, the image transmission from the NTSC system area to the PAL system area is shown, but other SECAM B system,
Image transmission between standard systems such as D system, I system, K 1 system, L system and PAL B system, D system, G system, I system, N system, and M system may be performed. Has the same effect.
以上のように、この発明によれば、符号化データにテレ
ビジョン信号形式を示す選択信号を付加して送信し、受
信側はその付加された選択信号から送信側の信号形式を
判別し、その信号形式のまま処理できるように構成した
ので、異標準方式の画像伝送が複雑な信号形式の変換を
必要としない簡単なシステムで実現できる効果がある。As described above, according to the present invention, the selection signal indicating the television signal format is added to the encoded data and transmitted, and the reception side determines the signal format of the transmission side from the added selection signal, Since it is configured so that the signal format can be processed as it is, there is an effect that the image transmission according to the different standard system can be realized by a simple system that does not require a complicated signal format conversion.
第１図はこの発明の一実施例による方式適応型画像伝送
システムを示すブロック図、第２図は従来の画像伝送シ
ステムを示すブロック図である。 図中、 （１）はNTSC用カメラ、（２）はNTSC信号、（３）は符
号化装置、（４）は方式変換部、（５）は符号化部、
（６）は多重化部、（７）は伝送路、（８）は復号化装
置、（９）は分離部、（10）は復号化部、（11）は方式
選択装置、（12）はフレームメモリ、（13）はNTSC/PAL
切り換え付き読み出し回路、（14）はNTSC/PAL切り換え
付きアナログ回路、（15）はNTSC信号、（16）はNTSC/P
AL切換え付きディスプレイ、（17）は制御信号、（18）
は中間フォーマット用フレームメモリ、（19）は方式変
換読み出し回路、（20）はPAL用アナログ回路、（21）
はPAL信号、（22）はPAL用ディスプレイ。 なお、各図中、同一符号は同一又は相当部分を示す。FIG. 1 is a block diagram showing a system adaptive image transmission system according to an embodiment of the present invention, and FIG. 2 is a block diagram showing a conventional image transmission system. In the figure, (1) is a camera for NTSC, (2) is an NTSC signal, (3) is a coding device, (4) is a format conversion unit, (5) is a coding unit,
(6) is a multiplexing unit, (7) is a transmission line, (8) is a decoding device, (9) is a demultiplexing unit, (10) is a decoding unit, (11) is a scheme selection device, and (12) is Frame memory, (13) is NTSC / PAL
Readout circuit with switching, (14) NTSC / PAL analog circuit with switching, (15) NTSC signal, (16) NTSC / P
Display with AL switching, (17) is control signal, (18)
Is a frame memory for intermediate format, (19) is a format conversion readout circuit, (20) is an analog circuit for PAL, (21)
Is the PAL signal, and (22) is the PAL display. In each figure, the same reference numerals indicate the same or corresponding parts.
Claims (1)
号化伝送するシステムにおいて、送信側には符号化デー
タと共にテレビジョン信号形式を示す選択信号を付加す
る多重化回路を置き、受信側には受信信号から選択信号
を分離する分離回路と、復号化されたテレビジョン信号
を水平方向及び垂直方向の解像度と単位時間あたりのフ
レーム数が最大となるフォーマットで書き込むことので
きるフレームメモリを備えると共に、読み出しの周期及
び速度及び画素数を切り換えて読み出せる読み出し回路
と、クロマ変調方式を切り換えて表示できるディスプレ
イを持ち同期信号の波形・同期を切り換えて同期をとる
アナログ回路とを設け、前記読み出し回路および前記ア
ナログ回路及び前記ディスプレイを選択信号によって切
り換えて送信側の信号形式に合わせ、テレビジョン信号
形式の異なる２地点間のテレビジョン信号の符号化伝送
を行なうことを特徴とする方式適応型画像伝送システ
ム。1. In a system for digitizing and encoding and transmitting a television input signal, a transmitting side is provided with a multiplexing circuit for adding a selection signal indicating a television signal format together with encoded data, and a receiving side is provided with a received signal. And a frame memory that can write the decoded television signal in a format that maximizes the horizontal and vertical resolutions and the number of frames per unit time. The readout circuit and the analog are provided with a readout circuit that can read by switching the cycle, speed, and the number of pixels, and an analog circuit that has a display that can switch and display the chroma modulation method and that switches the waveform and synchronization of the synchronization signal to achieve synchronization. The circuit and the display are switched by the selection signal No. format combined scheme adaptive image transmission system, characterized in that for encoding the transmission of television signals between different two points of television signal format.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30296187A JPH0759084B2 (en) | 1987-11-30 | 1987-11-30 | Method adaptive image transmission system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30296187A JPH0759084B2 (en) | 1987-11-30 | 1987-11-30 | Method adaptive image transmission system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01144789A JPH01144789A (en) | 1989-06-07 |
| JPH0759084B2 true JPH0759084B2 (en) | 1995-06-21 |
Family
ID=17915236
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30296187A Expired - Fee Related JPH0759084B2 (en) | 1987-11-30 | 1987-11-30 | Method adaptive image transmission system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0759084B2 (en) |
-
1987
- 1987-11-30 JP JP30296187A patent/JPH0759084B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01144789A (en) | 1989-06-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |