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JP4597927B2 - Broadcast relay system and method - Google Patents
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JP4597927B2 - Broadcast relay system and method - Google Patents

Broadcast relay system and method Download PDF

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JP4597927B2
JP4597927B2 JP2006233143A JP2006233143A JP4597927B2 JP 4597927 B2 JP4597927 B2 JP 4597927B2 JP 2006233143 A JP2006233143 A JP 2006233143A JP 2006233143 A JP2006233143 A JP 2006233143A JP 4597927 B2 JP4597927 B2 JP 4597927B2
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broadcast
signal
packet
relay
relay device
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聡 宮林
誠 佐藤
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Nippon Television Network Corp
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Description

本発明は放送中継システムに関し、特に、放送波の中継に、IP網を使用する放送中継システム及びその方法に関する。   The present invention relates to a broadcast relay system, and more particularly to a broadcast relay system and method using an IP network for relaying broadcast waves.

従来、ビル陰や、地下街等、テレビ放送波が届かない場所に、テレビ放送波を中継する技術がある。代表的なものとしてギャプフィラーがある。このギャプフィラーは、放送波を一度受信し、受信した信号からノイズを除去後に再送信する。   Conventionally, there is a technology for relaying a television broadcast wave in a place where the television broadcast wave does not reach, such as in the shadow of a building or an underground mall. A typical example is a gap filler. This gap filler receives a broadcast wave once, removes noise from the received signal, and retransmits it.

しかしながら、従来のギャプフィラーの技術は、放送波の届かない地下街等の遮蔽空間では、地上から放送波を何らかの方法で引き込む必要があり、新たに配線工事や増幅器等の設備が必要であった。つまり、放送波が来ている地上でしか再送信は難しいという問題点があった。   However, in the conventional gap filler technology, in shielded spaces such as underground streets where broadcast waves do not reach, it is necessary to draw broadcast waves from the ground by some method, and new equipment such as wiring work and amplifiers is required. In other words, there is a problem that retransmission is difficult only on the ground where broadcast waves are coming.

また、放送波を受信して再送信するギャプフィラーの場合、受信した段階や、ギャプフィラーの場所まで放送信号を伝送する状況で、信号波の質の劣化や、再送信の回り込み受信による発振等の障害を回避する方法が必要であった。   Also, in the case of gap fillers that receive and retransmit broadcast waves, the quality of signal waves, oscillation due to sneak in retransmission, etc., at the stage of reception or the situation where broadcast signals are transmitted to the gap filler location, etc. There was a need for a way to avoid the obstacles.

そこで、本発明は上記課題に鑑みて発明されたものであって、その目的は地上から放送波を引き込むような特別な設備を必要とせず、放送波の届かない場所でも放送波を中継することができる放送中継システム及びその方法を提供することにある。   Therefore, the present invention has been invented in view of the above problems, and its purpose is not to require special equipment for drawing broadcast waves from the ground, and to relay broadcast waves even in places where broadcast waves do not reach. It is an object of the present invention to provide a broadcast relay system and a method thereof.

上記課題を解決する第の発明は、送信装置と中継装置とを有するデジタル放送の中継システムであって、前記送信装置は、デジタル放送される放送TS信号のうち移動受信用の1セグメントの放送TS信号、前記中継装置のアドレスを含むヘッダ及び誤り訂正を施してIPパケット化するパケット化手段と、ネットワークを介して、前記IPパケット化されたIPパケットを送信するパケット送信手段とを有し、前記中継装置は、前記ネットワークを介して、前記IPパケットを受信する受信手段と、前記IPパケットから移動受信用の放送TS信号を再構築する再構築手段と、再構築された放送TS信号を変調して放送する放送手段とを有することを特徴とする。 A first invention for solving the above problem is a digital broadcast relay system having a transmission device and a relay device , wherein the transmission device broadcasts one segment for mobile reception among broadcast TS signals to be digitally broadcast. the TS signal, a packetizing unit that IP packetizes by performing header and error correction contains the address of the relay device, via a network, have a packet transmission means for transmitting the IP packetized IP packet The relay device receives the IP packet via the network, a reconstructing means for reconstructing a broadcast TS signal for mobile reception from the IP packet, and a reconstructed broadcast TS signal. And broadcasting means for modulating and broadcasting .

上記課題を解決する第の発明は、上記第の発明において、放送局から放送される本線側の放送TS信号による放送波と前記中継装置から放送される放送波とが同期されて放送されるように、放送局から放送される本線側の放送TS信号及びIP化される移動受信用の1セグメントの放送TS信号の少なくともいずれかを遅延する遅延手段を有することを特徴とする。 According to a second invention for solving the above-mentioned problem, in the first invention, a broadcast wave generated by a broadcast TS signal on the main line broadcast from a broadcasting station and a broadcast wave broadcast from the relay device are broadcast in synchronization. As described above, it has a delay means for delaying at least one of the main-line side broadcast TS signal broadcast from the broadcast station and the mobile reception one-segment broadcast TS signal to be converted to IP .

上記課題を解決する第の発明は、デジタル放送の中継方法であって、送信装置は、放送局からデジタル放送されるTS信号のうち移動受信用の1セグメントの放送TS信号を、中継装置のアドレスを含むヘッダ及び誤り訂正を施してIPパケット化し、前記送信装置は、ネットワークを介して、前記IPパケット化されたIPパケットを前記中継装置に送信し、前記中継装置は、前記IPパケットから移動受信用の放送TS信号を再構築し、前記中継装置は、再構築されたTS信号を変調して放送することを特徴とする。 A third invention for solving the above-described problem is a digital broadcast relay method, in which a transmitter transmits a one-segment broadcast TS signal for mobile reception out of TS signals digitally broadcast from a broadcast station . A header including an address and error correction are performed to form an IP packet, and the transmission device transmits the IP packet that has been converted into an IP packet to the relay device via a network, and the relay device moves from the IP packet. The broadcast TS signal for reception is reconstructed, and the relay device modulates the reconstructed TS signal and broadcasts it.

上記課題を解決する第の発明は、上記第の発明において、放送局から放送される本線側の放送TS信号による放送波と前記中継装置から放送される放送波とが同期されて放送されるように、放送局から放送される本線側のTS信号及びIPパケット化される移動受信用の1セグメントの放送信号の少なくともいずれかを遅延することを特徴とする。
According to a fourth aspect of the present invention for solving the above-mentioned problem, in the third aspect of the invention, a broadcast wave generated by a main-line broadcast TS signal broadcast from a broadcast station and a broadcast wave broadcast from the relay device are broadcast in synchronization. As described above , at least one of the TS signal on the main line broadcast from the broadcasting station and the one-segment broadcast signal for mobile reception that is IP packetized is delayed.

本発明によれば、放送波を受信することができない場所であっても、放送品質を確保した放送波を中継することができる。   According to the present invention, even in a place where a broadcast wave cannot be received, it is possible to relay a broadcast wave that ensures broadcast quality.

また、本発明によれば、自中継装置の送信による回り込み受信による発振も発生せず、SFN難視対応も可能となる。   In addition, according to the present invention, oscillation due to sneak reception due to transmission of the own relay device does not occur, and SFN deficiency correspondence is possible.

本発明の実施の形態を説明する。尚、以下の説明においては、固定受信用の12セグメント放送と移動受信用の1セグメント放送とから成る地上デジタル放送を例に取り説明する。   An embodiment of the present invention will be described. In the following description, terrestrial digital broadcasting composed of 12-segment broadcasting for fixed reception and 1-segment broadcasting for mobile reception will be described as an example.

図1は本発明の中継システムの構成図である。   FIG. 1 is a configuration diagram of a relay system according to the present invention.

図1中、1は放送局、2は送信装置、3は中継装置、4はIPネットワークである。   In FIG. 1, 1 is a broadcasting station, 2 is a transmission device, 3 is a relay device, and 4 is an IP network.

放送局1は、固定受信用の12セグメントのTSと移動受信用の1セグメントのTSとを多重化する多重化部11と、多重化されたTS信号をOFDM変調、放送周波数に変更して放送するOFDM変調放送部12とを備える。   The broadcasting station 1 multiplexes the 12-segment TS for fixed reception and the 1-segment TS for mobile reception, and changes the multiplexed TS signal to OFDM modulation and broadcast frequency for broadcasting. And an OFDM modulation broadcast unit 12.

送信装置2は、デジタル放送の1セグメントのTSを、IPパケット化するIPパケット化部21と、IPパケット化部21で生成されたパケットを、IPネットワーク4を介して中継装置3に送信するIP伝送制御部22とを備える。   The transmission device 2 is an IP packetizing unit 21 that converts a one-segment TS of digital broadcasting into an IP packet, and an IP that transmits a packet generated by the IP packetizing unit 21 to the relay device 3 via the IP network 4. A transmission control unit 22.

中継装置3は、IPネットワーク4を介してIPパケットを受信するIPパケット受信部31と、受信したIPパケットからTSを再構築するTS再構築部32と、再構築されたTS信号を記憶するメモリ33と、IPネットワークの同期信号からOFDM変調用の同期信号を発生する同期信号発生部34と、TS信号をOFDM変調及び放送周波数に変更して放送するOFDM変調放送部35とを備える。   The relay device 3 includes an IP packet receiving unit 31 that receives an IP packet via the IP network 4, a TS reconstruction unit 32 that reconstructs a TS from the received IP packet, and a memory that stores the reconstructed TS signal. 33, a synchronization signal generation unit 34 that generates a synchronization signal for OFDM modulation from a synchronization signal of the IP network, and an OFDM modulation broadcasting unit 35 that changes the TS signal to OFDM modulation and broadcast frequency and broadcasts.

上記のように構成された中継システムは、以下のように動作する。   The relay system configured as described above operates as follows.

まず、放送局1から送信装置2には映像・音声等が多重化された放送信号(TS:31.5Mbps:ワンセグ信号の場合はそこからワンセグTSヘッダのついた信号を抜き取り400kbps)が伝送される。   First, a broadcast signal (TS: 31.5 Mbps: in the case of a one-segment signal, a signal with a one-segment TS header is extracted from the broadcast station 1 is transmitted to the transmission device 2 is 400 kbps). The

送信装置2のIPパケット化部211は、その放送TS信号をIPパケット化する。その際には、中継装置3のアドレスを含む通信用のIPヘッダや誤り訂正を施す。伝送制御部22は、生成されたIPパケットを、IPネットワーク4を介して送信する。   The IP packetization unit 211 of the transmission device 2 converts the broadcast TS signal into an IP packet. At that time, an IP header for communication including the address of the relay device 3 and error correction are performed. The transmission control unit 22 transmits the generated IP packet via the IP network 4.

中継装置3は、パケット受信部31により、IPパケットを受信する。受信されたIPパケットは、TS再構成部32により、放送用TSに再構成され、メモリ33に格納される。そして、OFDM変調放送部35は、再構築されたTS信号を、同期信号発生部34による同期信号に基づいて、OFDM変調、放送周波数に変更して放送する。   The relay device 3 receives the IP packet by the packet receiving unit 31. The received IP packet is reconstructed into a broadcasting TS by the TS reconstructing unit 32 and stored in the memory 33. Then, the OFDM modulation broadcast unit 35 broadcasts the reconstructed TS signal by changing to the OFDM modulation and broadcast frequency based on the synchronization signal from the synchronization signal generation unit 34.

このように構成することにより、放送波を受信することができない場所であっても、放送品質を確保した放送波を中継することができる。   By configuring in this way, it is possible to relay broadcast waves that ensure broadcast quality even in places where broadcast waves cannot be received.

また、自中継装置の送信による回り込み受信による発振も発生せず、SFN難視対応も可能となる。   In addition, oscillation due to sneak reception due to transmission of the own relay device does not occur, and it is possible to cope with SFN difficulty.

尚、送信局2や中継装置3におけるパケット化処理や伝送遅延分を考慮して、図2に示す如く、放送局1のOFDM変調放送部12から送信される放送波を予め遅延させる遅延調整部100を設けることにより、本放送側の放送波と中継装置2から送信される放送波との時間的なずれも解消することができる。また、このように本放送側の放送波の信号そのものに遅延をかけておけば、中継装置で地上波受信したスキャッタードパイロット信号(キャリアごとに3OFDM周期毎に入っている波形基準信号)を使い、キャリアごとの変調を同相にしてしまえば、SFNも可能となる。   In consideration of packetization processing and transmission delay in the transmitting station 2 and the relay device 3, a delay adjusting unit that delays a broadcast wave transmitted from the OFDM modulation broadcasting unit 12 of the broadcasting station 1 in advance as shown in FIG. By providing 100, the time lag between the broadcast wave on the main broadcast side and the broadcast wave transmitted from the relay device 2 can be eliminated. In addition, if the broadcast wave signal itself on the main broadcast side is delayed in this way, the scattered pilot signal (waveform reference signal included in every 3 OFDM periods for each carrier) received by the relay device is obtained. If the modulation for each carrier is made in phase, SFN becomes possible.

また、図3に示す如く、放送局1と送信局2との間に遅延調整部200を設け、放送局1から送信されるTSに対して、再送信波(OFDM変調放送部35から送信される放送波)相当の遅延調整かけるようにしても良い。
更に、送信周波数精度のための同期調整は、GPS信号利用しても良い。
Also, as shown in FIG. 3, a delay adjusting unit 200 is provided between the broadcasting station 1 and the transmitting station 2, and a retransmitted wave (transmitted from the OFDM modulation broadcasting unit 35) is transmitted to the TS transmitted from the broadcasting station 1. (Broadcast wave) may be adjusted for delay.
Furthermore, the GPS signal may be used for the synchronization adjustment for the transmission frequency accuracy.

図1は本発明の実施の形態に係る中継システムの構成図である。FIG. 1 is a configuration diagram of a relay system according to an embodiment of the present invention. 図2は本発明の他の実施の形態に係る中継システムの構成図である。FIG. 2 is a configuration diagram of a relay system according to another embodiment of the present invention. 図3は本発明の他の実施の形態に係る中継システムの構成図である。FIG. 3 is a configuration diagram of a relay system according to another embodiment of the present invention.

符号の説明Explanation of symbols

1 放送局
2 送信装置
3 中継装置
4 IPネットワーク
DESCRIPTION OF SYMBOLS 1 Broadcasting station 2 Transmission apparatus 3 Relay apparatus 4 IP network

Claims (4)

送信装置と中継装置とを有するデジタル放送の中継システムであって、
前記送信装置は、
デジタル放送される放送TS信号のうち移動受信用の1セグメントの放送TS信号、前記中継装置のアドレスを含むヘッダ及び誤り訂正を施してIPパケット化するパケット化手段と、ネットワークを介して、前記IPパケット化されたIPパケットを前記中継装置に送信するパケット送信手段とを有し、
前記中継装置は、
前記ネットワークを介して、前記IPパケットを受信する受信手段と、前記IPパケットから移動受信用の放送TS信号を再構築する再構築手段と、再構築された放送TS信号を変調して放送する放送手段とを有する
ことを特徴とする中継システム。
A digital broadcast relay system having a transmission device and a relay device ,
The transmitter is
Packetizing means for converting a broadcast TS signal of one segment for mobile reception out of a broadcast TS signal to be digitally broadcast into an IP packet by applying a header including an address of the relay device and error correction , and via a network, the IP packetized IP packet have a packet transmission means for transmitting to the relay device,
The relay device is
Via the network, receiving means for receiving the IP packet, and reconstructing means for reconstructing a broadcast TS signal for mobile reception from the IP packet, broadcast to broadcast by modulating the broadcast TS signal reconstructed And a relay system.
放送局から放送される本線側の放送TS信号による放送波と前記中継装置から放送される放送波とが同期されて放送されるように、放送局から放送される本線側の放送TS信号及びIP化される移動受信用の1セグメントの放送TS信号の少なくともいずれかを遅延する遅延手段を有することを特徴とする請求項1に記載の中継システム。 The main-side broadcast TS signal and IP broadcast from the broadcast station are broadcast so that the broadcast wave from the main-side broadcast TS signal broadcast from the broadcast station and the broadcast wave broadcast from the relay device are synchronized and broadcast. 2. The relay system according to claim 1, further comprising delay means for delaying at least one of the one-segment broadcast TS signals for mobile reception to be converted . デジタル放送の中継方法であって、
送信装置は、放送局からデジタル放送されるTS信号のうち移動受信用の1セグメントの放送TS信号を、中継装置のアドレスを含むヘッダ及び誤り訂正を施してIPパケット化し、
前記送信装置は、ネットワークを介して、前記IPパケット化されたIPパケットを前記中継装置に送信し、
前記中継装置は、前記IPパケットから移動受信用の放送TS信号を再構築し、
前記中継装置は、再構築されたTS信号を変調して放送する
ことを特徴とする中継方法。
A relay method for digital broadcasting,
The transmission device performs a mobile reception 1-segment broadcast TS signal among TS signals digitally broadcast from the broadcast station, converts the header including the address of the relay device and error correction into an IP packet,
The transmission device transmits the IP packet that has been converted into the IP packet to the relay device via a network,
The relay device reconstructs a mobile TS broadcast TS signal from the IP packet,
The relay apparatus modulates the reconstructed TS signal and broadcasts it.
放送局から放送される本線側の放送TS信号による放送波と前記中継装置から放送される放送波とが同期されて放送されるように、放送局から放送される本線側のTS信号及びIPパケット化される移動受信用の1セグメントの放送信号の少なくともいずれかを遅延することを特徴とする請求項3に記載の中継方法。 The main-side TS signal and IP packet broadcast from the broadcasting station so that the broadcast wave from the main-side broadcast TS signal broadcast from the broadcasting station and the broadcast wave broadcast from the relay device are broadcast in synchronization. 4. The relay method according to claim 3, wherein at least one of the mobile reception one-segment broadcast signals to be converted is delayed.
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JP2007104085A (en) * 2005-09-30 2007-04-19 Toshiba Corp Digital broadcasting method and apparatus using communication line

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