JP2004180189A - Retransmission system and receiving system of digital broadcasting - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable a system that retransmits digital broadcasting on CATV, in which unique information such as an electronic program guide is transmitted by each broadcasting station, to flexibly support changes of time arrangement such as program extension. <P>SOLUTION: The system extracts the information of the digital broadcasting, and transmits the information of the digital broadcasting to be retransmitted on the CATV, by conducting multiplexing with the information into the transport stream of the digital broadcasting. <P>COPYRIGHT: (C)2004,JPO

Description

【００２４】
【表２】

【００２５】
ＮＩＴによって、表２に示すトランスポート番号と論理チャネル番号の関係、表１に示す物理チャネルとトランスポート番号の関係が伝送される場合、要求論理チャネル番号がどのトランスポート番号で、そのトランスポート番号はどの物理チャネルで送られているかが分かるので、以下のような流れで受信周波数を変更できる。
【００２６】
ステップ９０１で、要求論理チャネル番号が要求されると、ステップ９０２で現在受信している物理チャネルのトランスポート番号を確認し、ステップ９０３に移行して、トランスポート番号と論理チャネル番号の関係の表２から要求論理チャネル番号のトランスポート番号を確認する。さらに、ステップ９０４で、その要求されたトランスポート番号と現在受信のトランスポート番号が一致するか否かの判断をする。一致していれば（「はい」の場合）、ステップ９０５に移行して、ＰＡＴ内の情報からＰＭＴを抽出し、ステップ９０６でＰＭＴ内情報から要求論理チャネルの信号を分離し、ステップ９０７で分離した信号から映像、音声を復号する。
【００２７】
一致していない場合（「いいえ」の場合）、ステップ９０８において、物理チャネルとトランスポート番号の関係の表２に基づいて、要求論理チャネル番号が含まれるトランスポート番号に相当する物理チャネル（ＮＩＴ記述の物理チャネル）を選局するために受信周波数を変更する。次にステップ９０９に移行して、新たに受信した物理チャネルのＰＡＴを得、ステップ９０５で、ＰＡＴ内の情報からＰＭＴを抽出し、ステップ９０６で、ＰＭＴ内情報から要求論理チャネルの信号を分離し、ステップ９０７で、分離された信号から映像、音声を復号する。（実施の形態１）
図１は本発明による地上デジタル放送の再送信に使用する再送信装置の一実施例と受信装置の例を示すブロック図である。図１において、１は再送信装置、２は受信装置、３は伝送路、１０は地上デジタル放送受信アンテナ、１１ａ、１１ｂ、１１ｎは地上デジタル再送信機器、１２は合成回路、１３は地上デジタル放送情報合成装置、２１は周波数選択回路、２２は６４ＱＡＭ復調回路、２３はＭＰＥＧ−ＴＳパケット分離回路、２４はＭＰＥＧビデオデコーダ回路、２５はオーディオデコーダ回路、２６は受信端末側の表示装置、１１１ａ、１１１ｂ、１１１ｎは地上デジタル受信復調回路、１１２ａ、１１２ｂ、１１２ｎは地上デジタル放送情報抽出回路、１１３ａ、１１３ｂ、１１３ｎは地上デジタル放送情報等追加回路、１１４ａ、１１４ｂ、１１４ｎは６４ＱＡＭ変調回路である。
【００２８】
再送信装置１では、地上デジタル放送受信アンテナ１０によって受信された地上デジタル放送の変調信号は、ケーブルによって再送信装置１の地上デジタル再送信機器１１ａ、１１ｂ、１１ｎでＣＡＴＶ伝送に適した６４ＱＡＭ信号に変換されて合成回路１２によって他の被変調波と周波数多重されて伝送路３に送信される。地上デジタル再送信機器１１ａ、１１ｂ、１１ｎは同一の機能を有しており、地上デジタル再送信機器１１ａ、１１ｂ、１１ｎ内の地上デジタル受信復調回路１１１ａ、１１１ｂ、１１１ｎで選択された地上チャネル放送のデジタル復調、誤り訂正やエネルギー拡散等の伝送路符号化の復号処理をして地上デジタル放送で伝送されたＭＰＥＧ−ＴＳを得る。
【００２９】
地上デジタル受信復調回路１１１ａ、１１１ｂ、１１１ｎで得られたＭＰＥＧ−ＴＳが地上デジタル放送情報等追加回路１１３ａ、１１３ｂ、１１３ｎに加えられるとともに、地上デジタル放送情報抽出回路１１２ａ、１１２ｂ、１１２ｎにも加えられ各々のＭＰＥＧ−ＴＳから地上デジタル放送の各局ＰＳＩなどの情報であって放送番組に関するＮＩＴ内のトランスポートＩＤとサービスＩＤならびにＰＭＴやＥＩＴなどのＳＩも抽出して地上デジタル放送情報合成装置１３にそれらの各局ＰＳＩなどの情報が集約される。また、ＮＩＴに記述されている放送送出局番号に相当するネットワークＩＤやその周波数などの伝送情報を記述する地上分配システム記述子も各局ＰＳＩなどの情報であるが、地上デジタル放送情報等追加回路１１３ａ、１１３ｂ、１１３ｎでは、地上デジタル放送の情報のうちＮＩＴをＣＡＴＶ伝送用として６４ＱＡＭ変調によるＣＡＴＶ伝送周波数情報である有線分配システム記述子と地上デジタル放送の送出マスターごとに異なるネットワークＩＤを統一した番号に変換するとともに地上デジタル放送情報合成装置１３からの地上デジタル放送の各局ＰＳＩであるトランスポートＩＤとサービスＩＤならびにＰＭＴやＥＩＴなどのＳＩも追加して６４ＱＡＭ変調回路１１４ａ、１１４ｂ、１１４ｎに送出する。６４ＱＡＭ変調回路１１４ａ、１１４ｂ、１１４ｎの出力である６４ＱＡＭ信号は合成回路１２によって周波数多重されて伝送路３に送信される。
【００３０】
受信装置２では、伝送路３に送出された複数のデジタル変調された被変調波を入力とし、複数のデジタル変調された被変調波から複数の周波数選択回路２１によって必要な被変調波を選択し、その選択された６４ＱＡＭ被変調波を６４ＱＡＭ復調回路２２で復調して、ＭＰＥＧ−ＴＳ形式デジタルデータに戻すことができる。ＭＰＥＧ−ＴＳ形式デジタルデータはＭＰＥＧ−ＴＳパケット分離回路２３に入力されて、ＭＰＥＧ−ＴＳパケット分離回路２３が映像と音声のそれぞれのパケットを分離して、映像パケットデータはＭＰＥＧビデオデコーダ２４でデコードされ、音声パケットはＭＰＥＧオーディオデコーダ２５でデコードされて、映像信号と音声信号が得られて、表示装置２６に入力される。
【００３１】
以上、地上デジタル放送情報等追加回路１１３ａ、１１３ｂ、１１３ｎによって、地上デジタル放送の各局ＰＳＩなどの情報とＣＡＴＶ伝送のための追加情報がＣＡＴＶ再送信する全ての信号に追加されているので、ＣＡＴＶ受信においては視聴者によって選ばれた希望番組を選択する過程については図８や図９で示したデジタル放送の選局方法と同じである。さらに、どの地上デジタル放送をＣＡＴＶ再送信するチャネルを受信していても放送局ごとに電子番組ガイドなどの独自情報が送信されていた各局ＰＳＩなどの情報が集約されて６４ＱＡＭ変調によってＣＡＴＶで再送信されているので、番組延長などの時間編成などの変更に柔軟に対応できる。
【００３２】
また、地上デジタル放送の各局ＰＳＩなどを集約する場合に、番組に相当するプログラム番号であるサービスＩＤやトランスポートＩＤが同一であると、受信装置ではどちらの情報か判断がつかなくなるので、その場合にはそれらの一方のＩＤ値を変換する必要があるが、地上デジタルテレビジョン放送の運用規定では同一値とならないことが決められているのでＩＤ値を変換する必要が無い。このことは、社団法人電波産業会で平成１４年７月２５日に策定された技術資料ＡＲＩＢ ＴＲ−Ｂ１４ １．１版「地上デジタルテレビジョン放送運用規定」の４−２１頁に識別子の運用がまとめられて記述されている。それによれば、地上デジタルテレビジョン方式のネットワークＩＤは一送出マスターに対して割り当てられて日本国内でユニークであって、トランスポートＩＤも同一値とされる。また、番組に相当するプログラム番号であるサービスＩＤも日本の全地上デジタルテレビジョン方式においてユニークとなるように運用される。このことが、ＣＡＴＶ再送信において、各地上デジタル放送のトランスポートＩＤとサービスＩＤをそのままとしてネットワークＩＤをＣＡＴＶの一値に代える本発明の実施形態を可能としている。
【００３３】
また、地上デジタルテレビジョン放送の伝送レートは変調方式などによって異なるが最大でも約２３Ｍｂｐｓであり、６４ＱＡＭによるＣＡＴＶの伝送レート約２９Ｍｂｐｓより約６Ｍｂｐｓ少ないので、各地上デジタル放送のＰＭＴなどのＳＩやＰＳＩなどの情報を集めて追加しても超えることはない。
【００３４】
また、地上デジタル放送の送信周波数が変更される場合には、地上デジタル再送信機器１１ａ、１１ｂ、１１ｎ内の地上デジタル受信復調回路１１１ａ、１１１ｂ、１１１ｎで対応する。
【００３５】
次に、図１に示した地上デジタル再送信機器１１ａ、１１ｂ、１１ｎの地上デジタル放送情報等追加回路１１３ａ、１１３ｂ、１１３ｎなどの処理を図２と図３を用いて説明する。
【００３６】
図２は本発明による地上デジタル放送の再送信装置を説明する図であって、２０１ａ、２０１ｂ、２０１ｎは地上デジタル受信復調出力データ例、２０２ａ、２０２ｂ、２０２ｎは地上デジタル放送抽出情報例、２０３は地上デジタル放送合成情報例である。
【００３７】
地上デジタル受信復調出力データ例２０１ａ、２０１ｂ、２０１ｎは地上デジタル受信復調回路１１１ａ、１１１ｂ、１１１ｎの出力データの一部を示す。地上デジタル放送抽出情報例２０２ａ、２０２ｂ、２０２ｎは地上デジタル受信復調出力データ例２０１ａ、２０１ｂ、２０１ｎから、各々の地上デジタル放送情報抽出回路１１２ａ、１１２ｂ、１１２ｎで抽出した情報例である。地上デジタル放送合成情報例２０３は、地上デジタル放送抽出情報例２０２ａ、２０２ｂ、２０２ｎが地上デジタル放送情報合成装置１３によって集約された合成情報例である。
【００３８】
図３は本発明による地上デジタル放送の再送信装置の処理を説明する図であって、３０１は地上デジタル放送合成情報出力例、３０２ａ、３０２ｂ、３０２ｎは地上デジタル放送再送信出力データ例である。
【００３９】
地上デジタル放送合成情報出力例３０１は地上デジタル放送情報等追加回路１１３ａ、１１３ｂ、１１３ｎにおいて、地上デジタル受信復調出力データ例２０１ａ、２０１ｂ、２０１ｎの各々に加えられるとともに各々違っているネットワークＩＤ（Ｎ＿ｉｄ）をＣＡＴＶのある一値（この例ではＸ）に変換されて地上デジタル放送再送信出力データ例３０２ａ、３０２ｂ、３０２ｎになる。このある値Ｘは、地上デジタル放送抽出情報例２０２ａ、２０２ｂ、２０２ｎに記載の１、２あるいはｎのある値、地上デジタル放送で割り当てられるネットワークＩＤの範囲の中で地上デジタル放送の放送局で使用されていない値あるいはＣＡＴＶ伝送で割り当てられるネットワークＩＤの範囲の中でＢＳ、ＣＳあるいは他のデジタル放送での再送信や自主放送などで使用されていない値などが適応される。
【００４０】
なお、受信装置が地上デジタル放送のネットワークＩＤの違いを無視する場合あるいは切り替える処理があったとしてもその処理時間を許せる場合などでは、ネットワークＩＤをＣＡＴＶのある一値（この例ではＸ）に変換する必要がない場合もある。
【００４１】
以上、図１と図２および図３で説明したように、本実施例によれば、地上デジタル放送情報追加回路１１３ａ、１１３ｂ、１１３ｎによって、地上デジタル放送の各局ＰＳＩなどの情報がＣＡＴＶ伝送のための情報とともにＣＡＴＶ再送信する信号に追加されているので、どの地上デジタル放送をＣＡＴＶ再送信するチャネルを受信していても各局ＰＳＩなどの情報がＣＡＴＶで再送信されていて、番組延長などの時間編成などの変更に柔軟に対応できる効果がある。
（実施の形態２）
図４は本発明による地上デジタル放送の再送信に使用する再送信装置の一実施例を示すブロック図である。
【００４２】
図４において、１２３ａ、１２３ｂ、１２３ｎは地上デジタル放送情報等変更追加回路、１２３１ａ、１２３１ｂ、１２３１ｎは地上デジタル放送情報変換記述回路、１２３２ａ、１２３２ｂ、１２３２ｎは地上デジタル放送情報等追加回路である。
【００４３】
地上デジタル受信復調回路１１１ａ、１１１ｂ、１１１ｎで得られたＭＰＥＧ−ＴＳが地上デジタル放送情報等変更追加回路１２３ａ、１２３ｂ、１２３ｎに加えられ、地上デジタル放送情報変換記述回路１２３１ａ、１２３１ｂ、１２３１ｎにおいて各々のＭＰＥＧ−ＴＳのＮＩＴに記述されている放送送出局番号に相当するネットワークＩＤやその周波数などの伝送情報を記述する地上分配システム記述子がＣＡＴＶ伝送用として６４ＱＡＭ変調によるＣＡＴＶ伝送周波数情報である有線分配システム記述子や地上デジタル放送の送出マスターごとに異なるネットワークＩＤを統一した番号に変換する。地上デジタル放送情報等変更追加回路１２３ａ、１２３ｂ、１２３ｎでは、地上デジタル放送情報変換記述回路１２３１ａ、１２３１ｂ、１２３１ｎとともに地上デジタル放送情報合成装置１３からの地上デジタル放送の各局ＰＳＩであるトランスポートＩＤとサービスＩＤならびにＰＭＴやＥＩＴなどのＳＩを地上デジタル放送情報等追加回路１２３２ａ、１２３２ｂ、１２３２ｎで追加して６４ＱＡＭ変調回路１１４ａ、１１４ｂ、１１４ｎに送出する。
【００４４】
図４においても、６４ＱＡＭ変調回路１１４ａ、１１４ｂ、１１４ｎに送出される出力のデータ例は、図３の地上デジタル放送再送信出力データ例３０２ａ、３０２ｂ、３０２ｎになる。
【００４５】
本実施例によれば、地上デジタル放送情報等変更追加回路１２３ａ、１２３ｂ、１２３ｎによって、地上デジタル放送の各局ＰＳＩなどの情報がＣＡＴＶ伝送のための情報とともにＣＡＴＶ再送信する信号に追加されているので、どの地上デジタル放送をＣＡＴＶ再送信するチャネルを受信していても各局ＰＳＩなどの情報がＣＡＴＶで再送信されていて、番組延長などの時間編成などの変更に柔軟に対応できる効果がある。
（実施の形態３）
図５は本発明による地上デジタル放送の再送信に使用する再送信装置の一実施例を示すブロック図である。図５において、１４は地上デジタル放送情報合成追加生成装置、１３３ａ、１３３ｂ、１３３ｎは地上デジタル放送情報等削除追加回路、１３３１ａ、１３３１ｂ、１３３１ｎは地上デジタル放送情報削除回路、１３３２ａ、１３３２ｂ、１３３２ｎは地上デジタル放送情報等追加回路である。
【００４６】
地上デジタル受信復調回路１１１ａ、１１１ｂ、１１１ｎで得られたＭＰＥＧ−ＴＳが地上デジタル放送情報等削除追加回路１３３ａ、１３３ｂ、１３３ｎに加えられ、各々のＭＰＥＧ−ＴＳのＮＩＴに記述されている放送送出局番号に相当するネットワークＩＤやその周波数などの伝送情報を記述する地上分配システム記述子を地上デジタル放送情報削除回路１３３１ａ、１３３１ｂ、１３３１ｎにおいて削除する。地上デジタル放送情報等追加回路１３３２ａ、１３３２ｂ、１３３２ｎにおいて、地上デジタル放送情報合成追加生成装置１４からの地上デジタル放送の各局ＰＳＩであるトランスポートＩＤとサービスＩＤならびにＰＭＴやＥＩＴなどのＳＩ情報に加えて、地上デジタル放送の送出マスターごとに異なるネットワークＩＤを統一した番号が加えられるとともに、６４ＱＡＭ変調によるＣＡＴＶ伝送周波数情報である有線分配システム記述子が地上デジタル放送情報等として追加される。地上デジタル放送情報等削除追加回路１３３ａ、１３３ｂ、１３３ｎの出力が６４ＱＡＭ変調回路１１４ａ、１１４ｂ、１１４ｎに送出される。
【００４７】
本実施例では、地上デジタル放送情報等削除追加回路１３３ａ、１３３ｂ、１３３ｎの地上デジタル放送情報等追加回路１３３２ａ、１３３２ｂ、１３３２ｎに対して、各々に有線分配システム記述子のＣＡＴＶ伝送周波数情報が別々に地上デジタル放送情報合成追加生成装置１４から送出される。
【００４８】
図５においても、６４ＱＡＭ変調回路１１４ａ、１１４ｂ、１１４ｎに送出される出力のデータ例は、図３の地上デジタル放送再送信出力データ例３０２ａ、３０２ｂ、３０２ｎになる。
【００４９】
本実施例によれば、地上デジタル情報等削除追加回路１３３ａ、１３３ｂ、１３３ｎによって、地上デジタル放送の各局ＰＳＩなどの情報がＣＡＴＶ伝送のための情報とともにＣＡＴＶ再送信する信号に追加されているので、どの地上デジタル放送をＣＡＴＶ再送信するチャネルを受信していても各局ＰＳＩなどの情報がＣＡＴＶで再送信されていて、番組延長などの時間編成などの変更に柔軟に対応できる効果がある。
（実施の形態４）
図６は本発明による地上デジタル放送の再送信に使用する再送信装置の一実施例を示すブロック図である。図６において、１５は地上デジタル放送情報合成共通追加情報生成装置、１２２ａ、１２２ｂ、１２２ｎは地上デジタル放送情報設定選択分離削除回路、１４３ａ、１４３ｂ、１４３ｎは地上デジタル放送情報等設定追加回路、１４３１ａ、１４３１ｂ、１４３１ｎは地上デジタル放送情報等設定生成回路、１４３２ａ、１４３２ｂ、１４３２ｎは地上デジタル放送情報等追加回路である。
【００５０】
地上デジタル受信復調回路１１１ａ、１１１ｂ、１１１ｎで得られたＭＰＥＧ−ＴＳが地上デジタル放送情報設定選択分離削除回路１２２ａ、１２２ｂ、１２２ｎによって、各々のＭＰＥＧ−ＴＳのＮＩＴに記述されている放送送出局番号に相当するネットワークＩＤやその周波数などの伝送情報を記述する地上分配システム記述子を削除し、各々のＭＰＥＧ−ＴＳから地上デジタル放送の各局ＰＳＩなどの情報であって抄出される番組の関するＮＩＴ内のトランスポートＩＤとサービスＩＤならびにＰＭＴやＥＩＴなどのＳＩなども選択分離して地上デジタル放送情報合成共通追加情報生成装置１５に送出する。地上デジタル放送情報合成共通追加情報生成装置１５では、地上デジタル放送の各局ＰＳＩであるトランスポートＩＤとサービスＩＤならびにＰＭＴやＥＩＴなどのＳＩ情報と地上デジタル放送の送出マスターごとに異なるネットワークＩＤをＣＡＴＶ伝送のために統一された番号に設定されたネットワークＩＤ情報が地上デジタル放送情報等として送出する。
【００５１】
地上デジタル放送情報設定選択分離削除回路１２２ａ、１２２ｂ、１２２ｎで地上分配システム記述子などが削除された各々のＭＰＥＧ−ＴＳは、地上デジタル放送情報等設定追加回路１４３ａ、１４３ｂ、１４３ｎに加えられ、地上デジタル放送情報等設定追加回路１４３ａ、１４３ｂ、１４３ｎ内の地上デジタル放送情報等追加回路１４３２ａ、１４３２ｂ、１４３２ｎにおいて、地上デジタル放送情報等設定生成回路１４３１ａ、１４３１ｂ、１４３１ｎで情報設定発生された６４ＱＡＭ変調によるＣＡＴＶ伝送周波数情報である有線分配システム記述子の情報に、地上デジタル放送情報合成共通追加情報生成装置１５からの地上デジタル放送情報等に加えられる。地上デジタル放送情報等削除追加回路１４３ａ、１４３ｂ、１４３ｎの出力が６４ＱＡＭ変調回路１１４ａ、１１４ｂ、１１４ｎに送出される。
【００５２】
本実施例では、地上デジタル放送情報等設定追加回路１４３ａ、１４３ｂ、１４３ｎの地上デジタル放送情報等設定生成回路１４３１ａ、１４３１ｂ、１４３１ｎで各々に有線分配システム記述子のＣＡＴＶ伝送周波数情報が設定され、地上デジタル放送情報等追加回路１４３２ａ、１４３２ｂ、１４３２ｎに対しては地上デジタル放送の各局ＰＳＩなどのＳＩ情報が合成された情報とＣＡＴＶ伝送のための統一ネットワークＩＤ情報などの共通情報のみが地上デジタル放送情報合成共通追加情報生成装置１５から送出される。
【００５３】
図６においても、６４ＱＡＭ変調回路１１４ａ、１１４ｂ、１１４ｎに送出される出力のデータ例は、図３の地上デジタル放送再送信出力データ例３０２ａ、３０２ｂ、３０２ｎになる。
【００５４】
本実施例によれば、地上デジタル放送情報等設定追加回路１４３ａ、１４３ｂ、１４３ｎによって、地上デジタル放送の各局ＰＳＩなどの情報がＣＡＴＶ伝送のための情報とともにＣＡＴＶ再送信する信号に追加されているので、どの地上デジタル放送をＣＡＴＶ再送信するチャネルを受信していても各局ＰＳＩなどの情報がＣＡＴＶで再送信されていて、番組延長などの時間編成などの変更に柔軟に対応できる効果がある。
（実施の形態５）
図７は本発明による地上デジタル放送の再送信に使用する再送信装置の一実施例を示すブロック図である。
【００５５】
図７において、１６は地上デジタル放送情報等設定装置、１５３ａ、１５３ｂ、１５３ｎは地上デジタルデジタル放送情報等生成追加回路、１５３１ａ、１５３１ｂ、１５３１ｎは地上デジタル放送情報等生成回路、１５３２ａ、１５３２ｂ、１５３２ｎは地上デジタル放送情報等追加回路である。
【００５６】
地上デジタル放送情報等設定装置１６で、６４ＱＡＭ変調回路１１４ａ、１１４ｂ、１１４ｎから送出される６４ＱＡＭ変調のＣＡＴＶ伝送周波数情報などの有線分配システム記述子の情報を作成して、地上デジタル放送情報等生成回路１５３１ａ、１５３１ｂ、１５３１ｎに設定することで有線分配システム記述子の情報が地上デジタル放送情報等生成回路１５３１ａ、１５３１ｂ、１５３１ｎから発生される。
【００５７】
地上デジタル放送情報設定選択分離削除回路１２２ａ、１２２ｂ、１２２ｎで地上分配システム記述子などが削除された各々のＭＰＥＧ−ＴＳは、地上デジタル放送情報等生成追加回路１５３ａ、１５３ｂ、１５３ｎに加えられ、その中の地上デジタル放送情報等追加回路１５３２ａ、１５３２ｂ、１５３２ｎにおいて、地上デジタル放送情報合成共通追加情報生成装置１５からの地上デジタル放送情報等に地上デジタル放送情報等生成回路１５３１ａ、１５３１ｂ、１５３１ｎからの有線分配システム記述子の情報が加えられる。地上デジタル放送情報等生成追加回路１５３ａ、１５３ｂ、１５３ｎの出力が６４ＱＡＭ変調回路１１４ａ、１１４ｂ、１１４ｎに送出される。
【００５８】
本実施例では、地上デジタル放送情報等生成追加回路１５３ａ、１５３ｂ、１５３ｎの地上デジタル放送情報等生成回路１５３１ａ、１５３１ｂ、１５３１ｎで発生する有線分配システム記述子の情報は地上デジタル放送情報等設定装置１６で生成設定される。
【００５９】
図７においても、６４ＱＡＭ変調回路１１４ａ、１１４ｂ、１１４ｎに送出される出力のデータ例は、図３の地上デジタル放送再送信出力データ例３０２ａ、３０２ｂ、３０２ｎになる。
【００６０】
本実施例によれば、地上デジタル放送情報等生成追加回路１５３ａ、１５３ｂ、１５３ｎによって、地上デジタル放送の各局ＰＳＩなどの情報がＣＡＴＶ伝送のための情報とともにＣＡＴＶ再送信する信号に追加されているので、どの地上デジタル放送をＣＡＴＶ再送信するチャネルを受信していても各局ＰＳＩなどの情報がＣＡＴＶで再送信されていて、番組延長などの時間編成などの変更に柔軟に対応できる効果がある。
【００６１】
【発明の効果】
本発明によれば、どの地上デジタル放送をＣＡＴＶ再送信するチャネルを受信していても各局ＰＳＩなどの情報がＣＡＴＶで再送信されていて、番組延長などの時間編成などの変更に柔軟に対応できる効果がある。
【図面の簡単な説明】
【図１】本発明による地上デジタル放送の再送信に使用する送信装置と受信装置の一実施例を示すブロック図である。
【図２】本発明による地上デジタル放送の再送信装置を説明する図である。
【図３】本発明による地上デジタル放送の再送信装置を説明する図である。
【図４】本発明による地上デジタル放送の再送信に使用する再送信装置の一実施例を示すブロック図である。
【図５】本発明による地上デジタル放送の再送信に使用する再送信装置の一実施例を示すブロック図である。
【図６】本発明による地上デジタル放送の再送信に使用する再送信装置の一実施例を示すブロック図である。
【図７】本発明による地上デジタル放送の再送信に使用する再送信装置の一実施例を示すブロック図である。
【図８】デジタル放送の選局方法のフローチャートである。
【図９】デジタル放送の他の選局方法を示すフローチャートである。
【符号の説明】
１…再送信装置、２…受信装置、３…伝送路、１０…地上デジタル放送受信アンテナ、１１ａ、１１ｂ、１１ｎ…地上デジタル再送信機器、１２…合成回路、１３…地上デジタル放送情報合成装置、１４…地上デジタル放送情報合成追加生成装置、１５…地上デジタル放送情報合成共通追加情報生成装置、１６…地上デジタル放送情報等設定装置、２１…周波数選択回路、２２…６４ＱＡＭ復調回路、２３…ＭＰＥＧ−ＴＳパケット分離回路、２４…ＭＰＥＧビデオデコーダ回路、２５…オーディオデコーダ回路、２６…受信端末側の表示装置、１１１ａ、１１１ｂ、１１１ｎ…地上デジタル受信復調回路、１１２ａ、１１２ｂ、１１２ｎ…地上デジタル放送情報抽出回路、１１３ａ、１１３ｂ、１１３ｎ…地上デジタル放送情報等追加回路、１１４ａ、１１４ｂ、１１４ｎ…６４ＱＡＭ変調回路、１２２ａ、１２２ｂ、１２２ｎ…地上デジタル放送情報設定選択分離削除回路、１２３ａ、１２３ｂ、１２３ｎ…地上デジタル放送情報等変更追加回路、１３３ａ、１３３ｂ、１３３ｎ…地上デジタル放送情報等削除追加回路、１４３ａ、１４３ｂ、１４３ｎ…地上デジタル放送情報等設定追加回路、１５３ａ、１５３ｂ、１５３ｎ…地上デジタル放送情報等生成追加回路、２０１ａ、２０１ｂ、２０１ｎ…地上デジタル受信復調出力データ例、２０２ａ、２０２ｂ、２０２ｎ…地上デジタル放送抽出情報例、２０３…地上デジタル放送合成情報例、３０１…地上デジタル放送合成情報出力例、３０２ａ、３０２ｂ、３０２ｎ…地上デジタル放送再送信出力データ例、１２３１ａ、１２３１ｂ、１２３１ｎ…地上デジタル放送情報変換記述回路、１２３２ａ、１２３２ｂ、１２３２ｎ…地上デジタル放送情報等追加回路、１３３１ａ、１３３１ｂ、１３３１ｎ…地上デジタル放送情報削除回路、１３３２ａ、１３３２ｂ、１３３２ｎ…地上デジタル放送情報等追加回路、１４３１ａ、１４３１ｂ、１４３１ｎ…地上デジタル放送情報等設定生成回路、１４３２ａ、１４３２ｂ、１４３２ｎ…地上デジタル放送情報等追加回路、１５３１ａ、１５３１ｂ、１５３１ｎ…地上デジタル放送情報等生成回路、１５３２ａ、１５３２ｂ、１５３２ｎ…地上デジタル放送情報等追加回路。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a retransmission device for converting a terrestrial digital broadcast modulation method and retransmitting the converted signal.
[0002]
[Prior art]
2. Description of the Related Art In recent years, satellite broadcasting and cable broadcasting (hereinafter abbreviated as CATV) have become widespread in various places in addition to conventional terrestrial broadcasting in which program images are transmitted to homes using radio waves in the VHF band and the UHF band. Recently, digital broadcasting is being standardized actively, and digital broadcasting by a communication satellite (CS: Communication Satellite) (hereinafter, abbreviated as CS digital broadcasting) is currently being commercialized. Also, digital broadcasting (hereinafter, abbreviated as BS digital broadcasting) by a broadcasting satellite (BS: Broadcast Satellite) and terrestrial digital broadcasting are aimed at practical use.
[0003]
In CS digital broadcasting, a QPSK (Quadrature Phase Shift Keying) method is used as a modulation method for one physical channel, and the transmission rate is 42.192 Mbps with a bandwidth of 27 MHz. On the other hand, digital broadcasting by CATV (hereinafter abbreviated as CATV digital broadcasting) uses a 64 QAM (64 Quadrature Amplitude Modulation) method as a modulation method for one physical channel, and has a transmission rate of 31.644 Mbps with a bandwidth of 6 MHz. Here, when the inner code of one physical channel of CS digital broadcasting is a convolutional coding rate of 3/4 and the outer code is a shortened Reed Solomon (204,188), the MPEG2-TS data rate excluding the correction code is about 29.162 Mbps. When re-transmitting CS digital broadcasting by CATV digital broadcasting, after performing error correction using the inner code and outer code of one physical channel of CS digital broadcasting to obtain an MPEG2-TS of 29.162 Mbps, it is newly used for CATV transmission. If a configuration is adopted in which a shortened Reed Solomon (204,188) code is added and retransmission is performed, the transmission rate is 31.644 Mbps, and one physical channel of CS digital broadcasting is directly reproduced by one physical channel of CATV digital broadcasting. Can be sent.
[0004]
For terrestrial digital broadcasting, an OFDM (Orthogonal frequency division multiplexing) system is used as a modulation system, and transmission can be performed with a bandwidth of 6 MHz per RF channel as in the case of current analog television broadcasting. Japanese Unexamined Patent Publication No. Hei 8-294098 "Broadcasting system and transmitter / receiver" includes a channel for describing a change in the transmission system, frequency, or addition of a service in addition to an OFDM signal for broadcasting video and audio. , A new device that can easily cope with the change of the transmission frequency of OFDM and the addition of a data service linked to video, for example, a text broadcast or a calendar for a person. (For example, refer to Patent Document 1.)
Further, the bandwidth of one RF channel of the OFDM terrestrial digital broadcasting is 6 MHz, which is the same in the CATV that mainly retransmits the current analog television broadcasting. It is also possible to transmit to each home through a transmission line.
[0005]
These digital broadcasts are based on an image compression technique based on MPEG (Moving Picture Experts Group) 2 and a multiplexing method using a data stream called a transport stream. According to digital broadcasting, these techniques can transmit several times the number of programs while maintaining the same image quality and sound quality as analog broadcasting. In the current analog broadcasting, one program is broadcast on one RF channel in a 6 MHz band, and thus both could be referred to as a channel. However, digital confusion occurs. Are called physical channels, and those corresponding to a plurality of programs are called logical channels. A system for broadcasting one transport stream on one physical channel (CS, terrestrial or CATV digital broadcasting) is a single TS transmission system, and a system for broadcasting two or more transport streams on one physical channel (BS digital broadcasting). It is called a multiple TS transmission system.
[0006]
In order to select a program in digital broadcasting of a single TS transmission system, unlike a conventional analog channel selection, a physical channel is selected and a requested logical channel is selected from one transport stream obtained by the physical channel. A two-stage operation of extraction is required. In MPEG2, program selection is performed using program usage information called PSI (Program Specific Information).
[0007]
The PSI includes a PAT (Program Association Table), a PMT (Program Map Table), a NIT (Network Information Table), and the like. The PAT indicates a transport stream number, a relationship between each logical channel number and the PMT, and the like. The PMT includes information and the like for separating and extracting video, audio, additional data, and the like constituting the program for each logical channel number. Further, the NIT includes information indicating which transport stream number is transmitted on which physical channel.
[0008]
A technique aimed at shortening the time for the channel selection operation is described in Japanese Patent Application Laid-Open No. 9-9156, entitled "Program Switching Method and Digital Satellite Broadcasting Receiver in Digital Satellite Broadcasting". (For example, see Patent Document 2.) This example will be described with reference to FIG.
[0009]
In addition, EPG (Electronic Program Guide: Electronic Program Guide) is described on page 149 of "Point Graphical Practice MPEG Textbook" published by Ascii Publishing Co., edited by Hiroshi Fujiwara. Further, SI (Service Information) is described in PSI. It describes that various additional data called "service information" can be added and transmitted, and by using the additional data, a program can be selected by operating a cursor on a television screen. (See, for example, Non-Patent Document 1.) As information for the EPG, information called an EIT (Event Information Table) is transmitted by SI.
[0010]
Japanese Patent Application Laid-Open No. H11-355224 entitled "Information Distribution System and Information Distribution Method" (for example, see Patent Document 3) discloses a method of converting an NIT to retransmit a CS digital broadcast by CATV. Japanese Patent Application Laid-Open No. 2000-18430, "Transmodulator and Receiver" (for example, refer to Patent Document 4) or Japanese Patent Application Laid-Open No. 2002-27422, "Information Transmitting Device and Method, Information Receiving Device and Method" (for example, Patent Document 5) Reference).
[0011]
As described above, since satellite digital broadcasting is an environment in which viewers nationwide can select and receive programs in the same manner, PSI and SI are commonly transmitted on CS and BS platforms. However, in terrestrial digital broadcasting, the range of radio waves is limited, and it is planned that each station of terrestrial digital broadcasting will transmit PSI and SI independently because it is impossible for viewers to accurately grasp how much radio waves can be received. .
[0012]
[Patent Document 1]
JP-A-8-294098
[Patent Document 2]
JP-A-9-9156
[Patent Document 3]
JP-A-11-355224
[Patent Document 4]
JP 2000-18430 A
[Patent Document 5]
JP-A-2002-27422
[Non-patent document 1]
Supervised by Hiroshi Fujiwara, published by ASCII Publishing Bureau, "Point Illustration Practical MPEG Textbook," p. 149
[0013]
[Problems to be solved by the invention]
In a retransmission system in which the modulation method is converted to 64QAM and retransmitted in order to retransmit CS digital broadcasts, terrestrial digital broadcasts, etc. on CATV, information (PSI or SI) such as an electronic program guide unique to each station is transmitted. It is necessary to determine how to send the information of the terrestrial digital broadcasting by CATV, its method, and the like. Further, in receiving a terrestrial digital broadcast, when a certain broadcast station is being received, information such as an electronic program guide due to a program extension of another broadcast station cannot be received. In order to receive information (PSI or SI) other than the broadcasting station being watched, it is necessary to provide another tuner or the like and have a function to obtain information (PSI or SI) other than the broadcasting station being watched. However, in this case, the receiving device becomes expensive. As described above, it is required that a CATV receiving apparatus or the like does not become expensive or complicated, and that it can flexibly cope with a change in time organization or the like due to an extension of a terrestrial digital broadcast program or the like.
[0014]
An object of the present invention is to convert a terrestrial digital broadcast transmitting information (PSI or SI) such as an electronic program guide unique to each station to a modulation method for CATV transmission such as 64QAM and to transmit the CATV. Another object of the present invention is to provide a digital broadcast retransmitting device for transmitting to a home through a road.
[0015]
[Means for Solving the Problems]
In order to achieve the object of the present invention, a digital broadcast retransmitting apparatus according to the present invention includes a plurality of demodulating means (111a, 111b, 111n) and a plurality of digital broadcast information extracting means (112a, 112b, 112n) for extracting digital broadcast information transmitted from each of the plurality of transport streams demodulated by the plurality of demodulating means. Digital broadcast information synthesizing means (13) for combining output information of the plurality of digital broadcast information extracting means into digital broadcast information to be retransmitted by CATV; and a plurality of transformers demodulated by the plurality of demodulating means. The digital broadcast information is added to each transport stream of the port stream. A plurality of digital broadcast information adding means for multiplexing combining information retransmitted digital broadcast CATV from combining means (113a, 113b, 113n) and a.
[0016]
According to the above-mentioned means, information such as each station PSI extracted by the plurality of digital broadcast information extracting means (112a, 112b, 112n) is aggregated by the digital broadcast information synthesizing means (13), and the plurality of digital broadcast information Since all information to be retransmitted by CATV is added by the information adding means (113a, 113b, 113n), information such as PSI of each station is retransmitted by CATV regardless of which digital broadcast channel is received. It is possible to flexibly respond to changes in time organization such as program extension.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the drawings together with embodiments (examples) of the present invention. In all the drawings for describing the embodiments of the present invention, components having the same functions are denoted by the same reference numerals, and their repeated description will be omitted.
[0018]
First, FIG. 8 is a flowchart of a digital broadcasting channel selection method. The reception channel selection operation will be described with reference to FIG. In step 801, when a number of a logical channel (meaning that a desired channel to be received is input using a remote controller or the like; hereinafter, this is abbreviated as a requested logical channel) is given to the receiving apparatus, first in step 802, The PAT of the currently received physical channel is obtained, and in step 803, it is checked whether or not the PAT includes the requested logical channel number.
[0019]
If “Yes”, that is, if the requested logical channel number is included, it means that the currently received physical channel includes the requested logical channel. , The signal of the requested logical channel is further separated from the information in the PMT in step 805, and the separated video and audio are decoded in step 806.
[0020]
If the requested logical channel number is not included in the PAT in step 803, it means that the currently received physical channel does not include the requested logical channel, and therefore, which physical channel includes the requested logical channel. In order to check whether or not the request has been transmitted, the process proceeds to step 807, where the NIT in which the same content is transmitted in parallel to all the physical channels is received, and information on the physical channel including the requested logical channel is extracted. Then, the frequency of tuning is changed to the determined physical channel, and in step 808, the PAT of this physical channel is obtained. Hereinafter, the PMT is extracted from the information in the PAT in step 804, the signal of the requested logical channel is separated from the information in the PMT in step 805, and video and audio are decoded from the separated signal in step 806.
[0021]
FIG. 9 is a flowchart showing another method of selecting a digital broadcast. FIG. 8 has described the channel selection method when the relationship between the physical channel and the transport number is described in the NIT, and the relationship between the transport number and the logical channel number is described in the PAT. An example of channel selection in a case where a relationship between a channel and a transport number and a relationship between a transport number and a logical channel number are described is shown.
[0022]
Table 1 shows the relationship between the physical channel and the transport number in the information described in the NIT, and Table 2 shows the relationship between the logical channel number and the transport number in the information described in the NIT.
[0023]
[Table 1]

[0024]
[Table 2]

[0025]
When the relationship between the transport number and the logical channel number shown in Table 2 and the relationship between the physical channel and the transport number shown in Table 1 are transmitted by the NIT, which transport number is the requested logical channel number and the transport number Since it is possible to know on which physical channel is transmitted, the reception frequency can be changed in the following flow.
[0026]
When the requested logical channel number is requested in step 901, the transport number of the currently received physical channel is confirmed in step 902, and the process proceeds to step 903, where a table of the relationship between the transport number and the logical channel number is displayed. 2 to confirm the transport number of the requested logical channel number. Further, in step 904, it is determined whether or not the requested transport number matches the currently received transport number. If they match (in the case of “Yes”), the process proceeds to step 905 to extract the PMT from the information in the PAT, separate the signal of the requested logical channel from the information in the PMT in step 906, and separate in step 907 Video and audio are decoded from the signal.
[0027]
If they do not match (in the case of "No"), in step 908, based on Table 2 of the relationship between the physical channel and the transport number, the physical channel (NIT description) corresponding to the transport number including the requested logical channel number The receiving frequency is changed in order to select the physical channel of the receiving station. Next, in step 909, the PAT of the newly received physical channel is obtained. In step 905, the PMT is extracted from the information in the PAT. In step 906, the signal of the requested logical channel is separated from the information in the PMT. In step 907, video and audio are decoded from the separated signals. (Embodiment 1)
FIG. 1 is a block diagram showing an embodiment of a retransmitting device used for retransmitting digital terrestrial broadcasting according to the present invention and an example of a receiving device. In FIG. 1, 1 is a retransmitting device, 2 is a receiving device, 3 is a transmission path, 10 is a terrestrial digital broadcast receiving antenna, 11a, 11b, and 11n are terrestrial digital retransmitting devices, 12 is a combining circuit, and 13 is terrestrial digital broadcasting. Information synthesis device, 21 is a frequency selection circuit, 22 is a 64QAM demodulation circuit, 23 is an MPEG-TS packet separation circuit, 24 is an MPEG video decoder circuit, 25 is an audio decoder circuit, 26 is a display device on the receiving terminal side, 111a and 111b , 111n are terrestrial digital broadcast demodulation circuits, 112a, 112b, 112n are terrestrial digital broadcast information extraction circuits, 113a, 113b, 113n are terrestrial digital broadcast information etc. additional circuits, and 114a, 114b, 114n are 64QAM modulation circuits.
[0028]
In the retransmitter 1, the terrestrial digital broadcast modulated signal received by the terrestrial digital broadcast receiving antenna 10 is converted into a 64QAM signal suitable for CATV transmission by the terrestrial digital retransmitters 11a, 11b, 11n of the retransmitter 1 via a cable. The signal is converted, frequency-multiplexed with another modulated wave by the combining circuit 12, and transmitted to the transmission path 3. The terrestrial digital retransmitting devices 11a, 11b, and 11n have the same function, and perform terrestrial digital broadcast demodulation circuits 111a, 111b, and 111n in the terrestrial digital retransmitting devices 11a, 111b, and 111n. MPEG-TS transmitted by digital terrestrial broadcasting is obtained by performing decoding processing of transmission path coding such as digital demodulation, error correction and energy spreading.
[0029]
The MPEG-TS obtained by the terrestrial digital reception demodulation circuits 111a, 111b, 111n is added to the terrestrial digital broadcast information etc. additional circuits 113a, 113b, 113n and also to the terrestrial digital broadcast information extraction circuits 112a, 112b, 112n. From each MPEG-TS, information such as the PSI of each station of terrestrial digital broadcasting, such as the transport ID and service ID in the NIT related to the broadcast program, and the SI such as PMT and EIT are also extracted and transmitted to the terrestrial digital broadcast information synthesizing device 13. Of each station PSI are aggregated. A terrestrial distribution system descriptor describing transmission information such as a network ID corresponding to a broadcast transmission station number described in the NIT and its frequency is also information such as each station PSI. , 113b and 113n, the NIT of the digital terrestrial broadcast information is used for CATV transmission, and the cable distribution system descriptor which is the CATV transmission frequency information by 64QAM modulation and the network ID different for each terrestrial digital broadcast transmission master are unified. At the same time, the terrestrial digital broadcast information synthesizing device 13 adds the transport ID and service ID, which are the PSI of each station of the terrestrial digital broadcast, and the SI such as PMT and EIT, and sends them to the 64QAM modulation circuits 114a, 114b, and 114n. The 64QAM signal output from the 64QAM modulation circuits 114a, 114b, 114n is frequency-multiplexed by the combining circuit 12 and transmitted to the transmission path 3.
[0030]
The receiving device 2 receives a plurality of digitally modulated waves transmitted to the transmission path 3 as input, and selects a required modulated wave from the plurality of digitally modulated waves by a plurality of frequency selection circuits 21. The 64QAM modulated wave selected can be demodulated by the 64QAM demodulation circuit 22 to return to the MPEG-TS format digital data. The MPEG-TS format digital data is input to an MPEG-TS packet separation circuit 23, which separates the video and audio packets, and the video packet data is decoded by an MPEG video decoder 24. The audio packet is decoded by the MPEG audio decoder 25 to obtain a video signal and an audio signal, which are input to the display device 26.
[0031]
As described above, the terrestrial digital broadcast information etc. additional circuits 113a, 113b, 113n add information such as each station PSI of terrestrial digital broadcast and additional information for CATV transmission to all signals to be retransmitted by CATV, so that CATV reception is performed. In, the process of selecting the desired program selected by the viewer is the same as the digital broadcast channel selection method shown in FIGS. In addition, no matter which terrestrial digital broadcast is received on the CATV retransmission channel, information such as the PSI of each station to which unique information such as an electronic program guide was transmitted for each broadcasting station is aggregated and retransmitted on the CATV by 64QAM modulation. It is possible to flexibly respond to changes in time organization such as program extension.
[0032]
Also, in the case where the terrestrial digital broadcasting stations PSI and the like are aggregated, if the service ID and the transport ID, which are the program numbers corresponding to the programs, are the same, the receiving device cannot determine which type of information. , It is necessary to convert one of the ID values. However, since the operation regulations of terrestrial digital television broadcasting determine that the values do not become the same, there is no need to convert the ID values. This is because the operation of the identifier is described on page 4-21 of the technical document ARIB TR-B14 1.1, “Digital Terrestrial Television Broadcasting Operational Regulations”, drafted on July 25, 2002 by the Association of Radio Industries and Businesses. It is described collectively. According to this, the network ID of the terrestrial digital television system is assigned to one transmission master, is unique in Japan, and the transport ID has the same value. Also, the service ID, which is a program number corresponding to a program, is operated so as to be unique in the digital terrestrial television system in Japan. This enables the embodiment of the present invention in which the transport ID and the service ID of each digital terrestrial broadcast are left as they are and the network ID is replaced with a single value of CATV in CATV retransmission.
[0033]
The transmission rate of terrestrial digital television broadcasting varies depending on the modulation method, but is at most about 23 Mbps. Since the transmission rate of CATV by 64QAM is about 29 Mbps, which is about 6 Mbps less, SI and PSI such as PMT of each terrestrial digital broadcasting are used. Even if we collect and add the information, we will not exceed it.
[0034]
Also, when the transmission frequency of the terrestrial digital broadcast is changed, it is handled by the terrestrial digital reception / demodulation circuits 111a, 111b, 111n in the terrestrial digital retransmission devices 11a, 11b, 11n.
[0035]
Next, processing of the terrestrial digital retransmission equipment 11a, 11b, 11n shown in FIG. 1 by the terrestrial digital broadcast information etc. additional circuits 113a, 113b, 113n will be described with reference to FIGS.
[0036]
FIG. 2 is a diagram for explaining a terrestrial digital broadcast retransmission apparatus according to the present invention. 201a, 201b, and 201n are examples of terrestrial digital reception demodulation output data, 202a, 202b, and 202n are examples of terrestrial digital broadcast extraction information. It is an example of terrestrial digital broadcast synthesis information.
[0037]
Terrestrial digital reception demodulation output data examples 201a, 201b, and 201n show a part of output data of terrestrial digital reception demodulation circuits 111a, 111b, and 111n. The terrestrial digital broadcast extraction information examples 202a, 202b, and 202n are examples of information extracted by the terrestrial digital broadcast information extraction circuits 112a, 112b, and 112n from the terrestrial digital reception demodulation output data examples 201a, 201b, and 201n. The terrestrial digital broadcast synthesis information example 203 is an example of synthesis information in which the terrestrial digital broadcast information extraction devices 202a, 202b, and 202n are aggregated by the terrestrial digital broadcast information synthesis device 13.
[0038]
FIG. 3 is a diagram for explaining the processing of the terrestrial digital broadcast retransmission device according to the present invention, wherein 301 is an example of terrestrial digital broadcast composite information output, and 302a, 302b, and 302n are examples of terrestrial digital broadcast retransmission output data.
[0039]
The terrestrial digital broadcast synthesis information output example 301 is added to each of the terrestrial digital reception demodulation output data examples 201a, 201b, and 201n in the terrestrial digital broadcast information etc. additional circuits 113a, 113b, and 113n and is different from the network ID (N_id). Is converted to a certain value (X in this example) of CATV, and becomes the terrestrial digital broadcast retransmission output data examples 302a, 302b, and 302n. This certain value X is a certain value of 1, 2 or n described in the terrestrial digital broadcast extraction information examples 202a, 202b, and 202n, and is used by a terrestrial digital broadcast broadcasting station within the range of the network ID assigned in the terrestrial digital broadcast. A value that is not used or a value that is not used in retransmission by BS, CS, or another digital broadcast, independent broadcast, or the like within the range of the network ID assigned by CATV transmission is applied.
[0040]
If the receiving device ignores the difference in the network ID of the terrestrial digital broadcast or if the processing time is allowed even if there is a switching process, the network ID is converted into a certain value of CATV (X in this example). You may not need to.
[0041]
As described above with reference to FIG. 1, FIG. 2 and FIG. 3, according to the present embodiment, information such as each station PSI of terrestrial digital broadcasting is transmitted by the terrestrial digital broadcasting information adding circuits 113a, 113b and 113n for CATV transmission. Is added to the signal to retransmit CATV along with the information of CATV, so that information such as PSI of each station is retransmitted by CATV regardless of which terrestrial digital broadcast channel is received by CATV, This has the effect of being able to flexibly respond to changes such as organization.
(Embodiment 2)
FIG. 4 is a block diagram showing an embodiment of a retransmission device used for retransmission of terrestrial digital broadcasting according to the present invention.
[0042]
In FIG. 4, reference numerals 123a, 123b, and 123n denote terrestrial digital broadcast information change addition circuits, 1231a, 1231b, and 1231n denote terrestrial digital broadcast information conversion description circuits, and 1232a, 1232b, and 1232n denote terrestrial digital broadcast information and other additional circuits.
[0043]
The MPEG-TS obtained by the terrestrial digital reception demodulation circuits 111a, 111b, 111n is added to the terrestrial digital broadcast information etc. change addition circuits 123a, 123b, 123n, and each of the terrestrial digital broadcast information conversion description circuits 1231a, 1231b, 1231n A terrestrial distribution system descriptor describing transmission information such as a network ID corresponding to a broadcast transmission station number described in the NIT of MPEG-TS and its frequency is a cable distribution which is CATV transmission frequency information by 64QAM modulation for CATV transmission. A different network ID is converted into a unified number for each system descriptor or terrestrial digital broadcast transmission master. In the terrestrial digital broadcast information change addition circuits 123a, 123b and 123n, together with the terrestrial digital broadcast information conversion description circuits 1231a, 1231b and 1231n, the transport ID and the service which are the PSI of each station of the terrestrial digital broadcast from the terrestrial digital broadcast information synthesizing device 13 are provided. The ID and SI such as PMT and EIT are added by terrestrial digital broadcast information etc. adding circuits 1232a, 1232b and 1232n and transmitted to 64QAM modulation circuits 114a, 114b and 114n.
[0044]
Also in FIG. 4, examples of output data transmitted to the 64QAM modulation circuits 114a, 114b, and 114n are examples of terrestrial digital broadcast retransmission output data 302a, 302b, and 302n in FIG.
[0045]
According to the present embodiment, the information such as each station PSI of the terrestrial digital broadcast is added to the signal to be retransmitted on the CATV together with the information for the CATV transmission by the terrestrial digital broadcast information etc. change addition circuits 123a, 123b and 123n. Regardless of which terrestrial digital broadcast receives a channel for retransmitting CATV, information such as PSI of each station is retransmitted on CATV, and there is an effect that it is possible to flexibly cope with changes in time organization such as program extension.
(Embodiment 3)
FIG. 5 is a block diagram showing an embodiment of a retransmitting device used for retransmitting digital terrestrial broadcasting according to the present invention. In FIG. 5, reference numeral 14 denotes a terrestrial digital broadcast information synthesizing and adding device, 133a, 133b, and 133n denote terrestrial digital broadcast information etc. deletion and addition circuits, 1331a, 1331b, and 1331n denote terrestrial digital broadcast information deletion circuits, and 1332a, 1332b, and 1332n denote terrestrial digital broadcast information deletion circuits. This is an additional circuit for digital broadcast information and the like.
[0046]
The MPEG-TS obtained by the terrestrial digital reception / demodulation circuits 111a, 111b, 111n is added to the terrestrial digital broadcast information etc. deletion addition circuits 133a, 133b, 133n, and the broadcast transmitting station described in the NIT of each MPEG-TS. The terrestrial digital broadcast information deletion circuits 1331a, 1331b, and 1331n delete the terrestrial distribution system descriptor describing the transmission information such as the network ID and the frequency corresponding to the number. In the terrestrial digital broadcast information etc. additional circuits 1332a, 1332b, 1332n, in addition to the transport ID and service ID, which are the PSI of each station of the terrestrial digital broadcast from the terrestrial digital broadcast information synthesis additional generation device 14, and the SI information such as PMT and EIT. In addition, a unified number for a different network ID is added to each transmission master of terrestrial digital broadcasting, and a cable distribution system descriptor which is CATV transmission frequency information by 64QAM modulation is added as terrestrial digital broadcasting information. The outputs of the terrestrial digital broadcast information etc. deletion addition circuits 133a, 133b, 133n are sent to the 64QAM modulation circuits 114a, 114b, 114n.
[0047]
In the present embodiment, the CATV transmission frequency information of the wired distribution system descriptor is separately provided to the terrestrial digital broadcast information etc. deletion and addition circuits 133a, 133b and 133n, respectively, for the terrestrial digital broadcast information etc. addition circuits 1332a, 1332b and 1332n. It is transmitted from the terrestrial digital broadcast information synthesis additional generation device 14.
[0048]
Also in FIG. 5, examples of output data transmitted to the 64QAM modulation circuits 114a, 114b, and 114n are examples of terrestrial digital broadcast retransmission output data 302a, 302b, and 302n in FIG.
[0049]
According to the present embodiment, information such as each station PSI of terrestrial digital broadcasting is added to the signal for CATV retransmission together with information for CATV transmission by the terrestrial digital information etc. deletion addition circuits 133a, 133b, 133n. Regardless of which terrestrial digital broadcast channel is retransmitted on CATV, information such as the PSI of each station is retransmitted on CATV, and there is an effect that it is possible to flexibly cope with changes in time organization such as program extension.
(Embodiment 4)
FIG. 6 is a block diagram showing an embodiment of a retransmission device used for retransmission of digital terrestrial broadcasting according to the present invention. In FIG. 6, 15 is a terrestrial digital broadcast information synthesis common additional information generation device, 122a, 122b, and 122n are terrestrial digital broadcast information setting selection separation / deletion circuits, 143a, 143b, and 143n are terrestrial digital broadcast information setting additional circuits, 1431a, Reference numerals 1431b and 1431n denote terrestrial digital broadcast information etc. setting generation circuits, and 1432a, 1432b and 1432n denote additional circuits for terrestrial digital broadcast information and the like.
[0050]
The MPEG-TS obtained by the terrestrial digital reception / demodulation circuits 111a, 111b, 111n is transmitted by the terrestrial digital broadcast information setting selection separation / deletion circuits 122a, 122b, 122n to the broadcasting transmission station number described in the NIT of each MPEG-TS. Deleting the terrestrial distribution system descriptor that describes the transmission information such as the network ID and its frequency corresponding to, and the information such as each station PSI of the terrestrial digital broadcasting from each MPEG-TS in the NIT related to the program extracted And the service ID and SI such as PMT and EIT are selectively separated and transmitted to the terrestrial digital broadcast information synthesis common additional information generating device 15. In the terrestrial digital broadcast information synthesizing common additional information generation device 15, the transport ID and the service ID which are the PSI of each station of the terrestrial digital broadcast, the SI information such as PMT and EIT, and the different network ID for each transmission master of the terrestrial digital broadcast are transmitted by CATV. The network ID information set to a unified number is transmitted as terrestrial digital broadcast information or the like.
[0051]
Each of the MPEG-TSs from which the terrestrial distribution system descriptors and the like have been deleted by the terrestrial digital broadcast information setting selection separation / deletion circuits 122a, 122b, and 122n is added to the terrestrial digital broadcast information setting addition circuits 143a, 143b, and 143n. In the terrestrial digital broadcast information etc. addition circuits 1432a, 1432b, 1432n in the digital broadcast information etc. setting addition circuits 143a, 143b, 143n, the 64QAM modulation generated by the information setting and generation by the terrestrial digital broadcast information etc. setting generation circuits 1431a, 1431b, 1431n. The information of the cable distribution system descriptor, which is the CATV transmission frequency information, is added to the terrestrial digital broadcast information from the terrestrial digital broadcast information synthesizing common additional information generation device 15 and the like. The outputs of the terrestrial digital broadcast information etc. deletion addition circuits 143a, 143b, 143n are sent to the 64QAM modulation circuits 114a, 114b, 114n.
[0052]
In this embodiment, the terrestrial digital broadcast information etc. setting addition circuits 143a, 143b, 143n of the terrestrial digital broadcast information etc. setting generation circuits 1431a, 1431b, 1431n respectively set the CATV transmission frequency information of the cable distribution system descriptor, For the additional circuits 1432a, 1432b, and 1432n for digital broadcast information, etc., only information in which SI information such as PSI of each terrestrial digital broadcast is combined and common information such as unified network ID information for CATV transmission are terrestrial digital broadcast information. It is sent from the combined common additional information generation device 15.
[0053]
Also in FIG. 6, examples of output data transmitted to the 64QAM modulation circuits 114a, 114b, and 114n are examples of terrestrial digital broadcast retransmission output data 302a, 302b, and 302n in FIG.
[0054]
According to the present embodiment, information such as each station PSI of terrestrial digital broadcasting is added to the signal for CATV retransmission together with information for CATV transmission by the terrestrial digital broadcasting information etc. setting addition circuits 143a, 143b, 143n. Regardless of which terrestrial digital broadcast receives a channel for retransmitting CATV, information such as PSI of each station is retransmitted on CATV, and there is an effect that it is possible to flexibly cope with changes in time organization such as program extension.
(Embodiment 5)
FIG. 7 is a block diagram showing an embodiment of a retransmission device used for retransmission of digital terrestrial broadcasting according to the present invention.
[0055]
In FIG. 7, 16 is a terrestrial digital broadcast information etc. setting device, 153a, 153b, 153n are terrestrial digital broadcast information etc. generation and addition circuits, 1531a, 1531b, 1531n are terrestrial digital broadcast information etc. generation circuits, 1532a, 1532b, 1532n are This is an additional circuit for digital terrestrial broadcasting information.
[0056]
The terrestrial digital broadcast information etc. setting device 16 creates information of a wired distribution system descriptor such as 64QAM modulation CATV transmission frequency information sent from the 64QAM modulation circuits 114a, 114b, 114n, and generates a terrestrial digital broadcast information etc. generation circuit. By setting to 1531a, 1531b, 1531n, the information of the cable distribution system descriptor is generated from the terrestrial digital broadcast information etc. generation circuits 1531a, 1531b, 1531n.
[0057]
Each of the MPEG-TSs from which the terrestrial distribution system descriptor and the like have been deleted by the terrestrial digital broadcast information setting selection separation / deletion circuits 122a, 122b, and 122n is added to the terrestrial digital broadcast information etc. generation addition circuits 153a, 153b, and 153n. In the terrestrial digital broadcast information etc. additional circuits 1532a, 1532b, 1532n, the terrestrial digital broadcast information etc. generation circuits 1531a, 1531b, 1531n connect the terrestrial digital broadcast information etc. The information of the distribution system descriptor is added. The outputs of the terrestrial digital broadcast information etc. generation addition circuits 153a, 153b, 153n are sent to the 64QAM modulation circuits 114a, 114b, 114n.
[0058]
In the present embodiment, the information of the cable distribution system descriptor generated in the terrestrial digital broadcast information etc. generation circuits 1531a, 1531b, 1531n of the terrestrial digital broadcast information etc. generation circuits 153a, 153b, 153n is stored in the terrestrial digital broadcast information etc. setting device 16. Is generated and set.
[0059]
Also in FIG. 7, examples of output data transmitted to the 64QAM modulation circuits 114a, 114b, and 114n are examples of terrestrial digital broadcast retransmission output data 302a, 302b, and 302n in FIG.
[0060]
According to the present embodiment, information such as each station PSI of terrestrial digital broadcasting is added to the signal for CATV retransmission together with information for CATV transmission by the terrestrial digital broadcasting information etc. generating and adding circuits 153a, 153b, 153n. Regardless of which terrestrial digital broadcast receives a channel for retransmitting CATV, information such as PSI of each station is retransmitted on CATV, and there is an effect that it is possible to flexibly cope with changes in time organization such as program extension.
[0061]
【The invention's effect】
According to the present invention, information such as PSI of each station is retransmitted by CATV regardless of which terrestrial digital broadcast channel is retransmitted by CATV, and it is possible to flexibly cope with a change in time organization such as program extension. effective.
[Brief description of the drawings]
FIG. 1 is a block diagram showing one embodiment of a transmitting device and a receiving device used for retransmission of digital terrestrial broadcasting according to the present invention.
FIG. 2 is a diagram illustrating a terrestrial digital broadcast retransmission device according to the present invention.
FIG. 3 is a diagram illustrating a terrestrial digital broadcast retransmission device according to the present invention.
FIG. 4 is a block diagram showing one embodiment of a retransmission device used for retransmission of terrestrial digital broadcasting according to the present invention.
FIG. 5 is a block diagram showing an embodiment of a retransmission device used for retransmission of terrestrial digital broadcasting according to the present invention.
FIG. 6 is a block diagram showing one embodiment of a retransmission device used for retransmission of terrestrial digital broadcasting according to the present invention.
FIG. 7 is a block diagram showing an embodiment of a retransmission device used for retransmission of terrestrial digital broadcasting according to the present invention.
FIG. 8 is a flowchart of a digital broadcast channel selection method.
FIG. 9 is a flowchart showing another method of selecting a digital broadcast.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Retransmission apparatus, 2 ... Receiving apparatus, 3 ... Transmission path, 10 ... Terrestrial digital broadcast receiving antenna, 11a, 11b, 11n ... Terrestrial digital retransmission equipment, 12 ... Synthesizing circuit, 13 ... Terrestrial digital broadcast information synthesizing apparatus, 14 terrestrial digital broadcast information synthesis additional generation device, 15 terrestrial digital broadcast information synthesis common additional information generation device, 16 terrestrial digital broadcast information etc. setting device, 21 frequency selection circuit, 22 64 QAM demodulation circuit, 23 MPEG- TS packet separation circuit, 24: MPEG video decoder circuit, 25: audio decoder circuit, 26: display device on the receiving terminal side, 111a, 111b, 111n: terrestrial digital reception demodulation circuit, 112a, 112b, 112n: terrestrial digital broadcast information extraction Circuits, 113a, 113b, 113n ... additional circuits such as terrestrial digital broadcast information 114a, 114b, 114n... 64QAM modulation circuit, 122a, 122b, 122n... Terrestrial digital broadcast information setting selection separation and deletion circuit, 123a, 123b, 123n... Terrestrial digital broadcast information etc. change addition circuit, 133a, 133b, 133n. Information etc. deletion addition circuit, 143a, 143b, 143n ... terrestrial digital broadcast information setting addition circuit, 153a, 153b, 153n ... terrestrial digital broadcast information etc. generation addition circuit, 201a, 201b, 201n ... terrestrial digital reception demodulation output data example, 202a, 202b, 202n: Example of terrestrial digital broadcast extracted information, 203: Example of terrestrial digital broadcast combined information, 301: Example of terrestrial digital broadcast combined information output, 302a, 302b, 302n: Example of terrestrial digital broadcast retransmission output data, 1231a, 1 31b, 1231n ... terrestrial digital broadcast information conversion description circuit, 1232a, 1232b, 1232n ... terrestrial digital broadcast information etc. additional circuit, 1331a, 1331b, 1331n ... terrestrial digital broadcast information deletion circuit, 1332a, 1332b, 1332n ... terrestrial digital broadcast information etc. Additional circuits, 1431a, 1431b, 1431n: terrestrial digital broadcast information etc. setting generation circuits, 1432a, 1432b, 1432n: terrestrial digital broadcast information etc. additional circuits, 1531a, 1531b, 1531n: terrestrial digital broadcast information etc. generation circuits, 1532a, 1532b, 1532n: Additional circuit for digital terrestrial broadcasting information and the like.

Claims (10)

A plurality of demodulating means for receiving and selecting a digital broadcast, demodulating and extracting a transport stream,
A plurality of information extraction means for extracting digital broadcast program information included in each of the transport streams extracted by the plurality of demodulation means,
Information synthesizing means for synthesizing new program information using output information of the plurality of information extracting means,
A plurality of information adding means for multiplexing each of the input transport streams and program information newly synthesized by the information synthesizing means;
Modulating each transport stream synthesized in the information adding means, a modulation synthesis means to synthesize as a retransmission signal,
Transmitting means for transmitting the signal synthesized by the modulation and synthesis means,
Digital broadcast retransmitting device comprising: The plurality of information adding means,
An information conversion means for converting a packet describing transmission line coding information related to a frequency, a modulation method, etc. in each input transport stream into transmission line coding information related to a retransmission frequency, a modulation method, etc. The digital broadcast retransmitting device according to claim 1, wherein: The information synthesizing unit synthesizes new program information by adding transmission line encoding information related to a frequency or a modulation method for retransmission,
The plurality of information adding means,
2. The digital broadcast according to claim 1, further comprising: an information deleting unit configured to delete a packet describing transmission line coding information related to a frequency, a modulation scheme, and the like in each of the input transport streams. Retransmission device. The information extracting means further deletes information included in each transport stream and sends the information to the information synthesizing means,
The information synthesizing unit synthesizes new program information by adding transmission line encoding information related to a frequency or a modulation method for retransmission,
2. The digital broadcast retransmission apparatus according to claim 1, wherein each of the plurality of information adding units includes an information setting unit that adds information to each of the input transport streams. The information setting means included in the plurality of information adding means respectively adds new information to each transport stream based on a signal from the same other information setting means. Digital broadcast retransmission device. 6. The digital broadcast retransmission apparatus according to claim 1, wherein the digital broadcast program information is PSI information or SI information in MPEG2. 6. The digital broadcast retransmission apparatus according to claim 1, wherein the modulation and synthesis unit performs modulation by QAM. The digital broadcast retransmission apparatus according to any one of claims 1 to 5, wherein the received digital broadcast is a terrestrial digital broadcast, and the received signal has different program information at each frequency. A receiving apparatus for receiving a transport stream including retransmitted program information and video packets,
Demodulation means for selecting a signal of a desired frequency from the received signal and demodulating the signal;
Packet separation means for separating packets included in the transport stream demodulated by the demodulation means using program information,
Decoding means for decoding the packet separated by the packet separating means,
The receiving apparatus, wherein the retransmitted transport stream includes, in a signal of one frequency, program information on channels of a plurality of other frequencies. The receiving apparatus according to claim 9, wherein the program information is PSI information or SI information in MPEG2.

Images