JP3743796B2

JP3743796B2 - Broadcast reception system

Info

Publication number: JP3743796B2
Application number: JP2000183993A
Authority: JP
Inventors: 良隆太田; 和暁高宗; 政治原田
Original assignee: Panasonic Corp; Matsushita Electric Industrial Co Ltd
Current assignee: Panasonic Corp; Panasonic Holdings Corp
Priority date: 2000-06-20
Filing date: 2000-06-20
Publication date: 2006-02-08
Anticipated expiration: 2020-06-20
Also published as: JP2002010157A

Description

【０００１】
【発明の属する技術分野】
本発明は、ＴＶ放送・衛星放送、あるいはケーブルテレビ放送を受信して視聴する放送受信システムに関し、特に送信信号の伝送の効率化を図ったものに関するものである。
【０００２】
【従来の技術】
近年、従来の地上波ＴＶ放送に加え、放送・通信衛星およびケーブルテレビによる多様な放送が開始され、放送受信システムが普及している。以下、従来の放送受信システムについて説明する。
【０００３】
図７は従来の放送受信システムの構成を示すブロック図である。図７において、１はＴＶ放送・衛星放送を受信するアンテナ、あるいはケーブルテレビ回線に接続された放送信号供給線、２は放送信号を再送信する再送信手段、３は後述する放送受信端末と再送信手段２とを結ぶ、第１の無線通信手段である片方向無線通信回線、４は再送信された放送信号を受信し、映像音声信号を復調する放送受信端末、５は受像手段である。また、６は電気通信網、７は電気通信網６を終端する電気通信網アクセス終端手段、８は放送受信端末４と電気通信網アクセス終端手段７とを結ぶ第２の通信手段である双方向無線通信回線である。
【０００４】
また、２１は上記再送信手段２を構成する周波数変換部、２２は上記再送信手段２を構成する送信部である。また、上記放送受信端末４は、受信部４１，周波数変換部４２，放送信号復調部４３，映像音響信号出力部４４，制御部４５，操作部４６，双方向通信部４７とから構成されており、さらに、上記電気通信網アクセス終端手段７は、電気通信網終端部７１，双方向通信部７２とから構成されている。
【０００５】
以上のように構成された従来の放送受信システムについて、以下その動作について説明する。
まず、再送信手段２の動作について説明する。放送信号供給線１より入力したＴＶ放送・衛星放送を受信するアンテナ、あるいはケーブルテレビ回線からの放送信号は周波数変換部２１に入力する。この周波数変換部２１では、入力信号を所定の周波数帯域の信号に変換して後段の送信部２２に出力する。送信部２２は入力信号を増幅して電波として送信する。こうして再送信手段２では入力した放送信号を所定の周波数帯域の電波として再送信する。一般に放送信号供給線１より供給される放送信号は広帯域の信号であるため、電波として再送信するためにミリ波帯の周波数が使用される。従って周波数変換部２１では入力した映像信号をミリ波帯域の信号へと変換する。再送信手段２から送信された信号は片方向無線通信回線３を介して放送受信端末４に送出される。
【０００６】
次に放送受信端末４の動作について説明する。受信部４１は、片方向無線通信回線３を介して再放送手段２より送出された信号を受信し、周波数変換部４２に出力する。周波数変換部４２では入力された信号を所定の周波数帯の信号に変換する。ここでの変換によって周波数変換部４２から出力された信号は、再送信手段２の周波数変換部２１に入力される前の信号に戻ることになる。周波数変換部４２の出力は放送信号復調部４３に入力され所定の復調が行われ放送信号から所定の映像信号、音響信号等の信号を映像音響信号出力部４４に出力する。映像音響信号出力部４４は受像手段５に出力する。
【０００７】
操作部４６から出力される指示信号は制御部４５に入力され、制御部４５は指示信号に応じた制御信号を放送信号復調部４３に出力し、放送信号の中から制御信号に応じた所定の映像信号、及び音響信号を復調する。こうして操作部４６からの指示に応じた映像、及び音響信号を受像手段５で視聴することができる。
【０００８】
また、制御部４５は操作部４６の指示信号により所定のデータを双方向通信部４７に出力する。この所定のデータとは、放送番組提供者に対して、有料の放送番組を視聴するための指示を行うなどのために必要なデータである。双方向通信部４７は、入力されたデータを所定の符号化と変調を行った後、双方向無線通信回線８を介して電気通信網アクセス終端手段７に送出する。電気通信網アクセス終端手段７の双方向通信部７２は、双方向無線通信回線８を介して入力した信号を復調、及び復号化した後、電気通信網終端部７１に出力する。電気通信網終端部７１では、入力された信号を電気通信網６に応じた所定の符号化と変調を行った後、電気通信網６に出力する。こうして電気通信網６を介して、有料の放送番組を視聴するために必要なデータが放送番組提供者に送出される。
【０００９】
以上のようにして、放送信号及び放送番組を視聴するために必要なデータを無線回線を介して伝送することにより、ＴＶ放送・衛星放送を受信するアンテナ、あるいはケーブルテレビ回線に接続された放送信号供給線１および電気通信網６と物理的にはなれた場所、例えば、隣の部屋に放送受信端末４を設置しても、これらを接続するための有線回線を新たに敷設することなく放送番組の視聴をすることができる。また、広帯域で、かつ片方向の伝送路を必要とする放送信号の伝送と、比較的狭帯域の伝送路で双方向で伝送することが必要な放送番組を視聴するためのデータとを別の無線回線で伝送することにより、安価に放送受信システムを構築可能としている。
【００１０】
【発明が解決しようとする課題】
従来の放送受信システムは以上のように構成されており放送信号供給線，及び電気通信網とは離れた場所に放送受信端末を容易に配置したりすることができ、また、伝送量に応じたそれぞれの無線通信回線を設けて安価な放送受信システムを構築できて便利なものであったが、放送信号の伝送に片方向の無線通信回線を用いており、効率よく伝送するためには、視聴に必要な時のみ無線通信回線を有効にすること、指向性の強いアンテナを用いて送信アンテナと受信アンテナの方向性を正確に一致させること、必要最小限の電力で伝送すること、また、他の無線通信回線との混信があった場合に別の周波数に変更すること等が必要である。しかしながら図７に示した放送受信端末４を再送信手段２と離れた別の部屋等に設置する場合には、片方向の無線通信回線を用いているので、送信側で受信側の受信状況を知ることができず、上記の効率的な伝送のために必要な条件を満たすことが困難であるという問題点があった。
【００１１】
本発明は以上のような問題点を解決するためになされたもので、放送受信端末を再送信手段と離れた場所に設置した場合でも効率的な放送信号の伝送ができる放送受信システムを提供することを目的とする。
【００１２】
【課題を解決するための手段】
本発明の請求項１にかかる放送受信システムは、片方向の通信路を有する第１の無線通信手段と、双方向の通信路を有する第２の無線通信手段と、前記第１および第２の無線通信手段に接続される放送受信端末と、アンテナで受信したＴＶ放送・衛星放送の受信信号、あるいはケーブルテレビ回線からの受信信号を前記第１の無線通信手段を介して前記放送受信端末に再送信し、前記第２の無線通信手段とも接続された再送信手段と、電気通信網に接続され、前記第２の無線通信手段を介して前記放送受信端末との間でデータ信号を送受信する電気通信網アクセス終端手段と、前記放送受信端末に設けられ、前記再送信手段の動作を制御する制御信号を前記第２の無線通信手段を介して前記再送信手段に伝送する再送信手段制御手段と、前記再送信手段制御手段より伝送された制御信号を受け、前記再送信手段の電波送出方向を制御する電波送出制御手段とを備え、前記電波送出制御手段は、前記放送受信端末の端末操作に基づく制御信号により、前記再送信手段の電波の送出方向を制御するものである。
【００１３】
また、本発明の請求項２にかかる放送受信システムは、上記請求項１記載の放送受信システムにおいて、前記第１の無線通信手段を介して受信した信号の電界強度を検出する電界検出手段を備え、前記再送信手段制御手段は、前記電界検出手段により検出された電界強度に応じた制御信号を前記電波送出制御手段に伝送するものである。
【００１５】
また，本発明の請求項３にかかる放送受信システムは、片方向の通信路を有する第１の無線通信手段と、双方向の通信路を有する第２の無線通信手段と、前記第１および第２の無線通信手段に接続される放送受信端末と、アンテナで受信したＴＶ放送・衛星放送の受信信号、あるいはケーブルテレビ回線からの受信信号を前記第１の無線通信手段を介して前記放送受信端末に再送信し、前記第２の無線通信手段とも接続された再送信手段と、電気通信網に接続され、前記第２の無線通信手段を介して前記放送受信端末との間でデータ信号を送受信する電気通信網アクセス終端手段と、前記放送受信端末に設けられ、前記再送信手段の動作を制御する制御信号を前記第２の無線通信手段を介して前記再送信手段に伝送する再送信手段制御手段と、前記第１の無線通信手段を介して受信した信号の電界強度を検出する電界検出手段と、前記再送信手段制御手段より伝送された制御信号を受け、前記再送信手段の送信電力を制御する電力制御手段とを備え、前記再送信手段制御手段は前記電界検出手段により検出された電界強度に応じた制御信号を前記第２の無線通信手段を介して前記電力制御手段に伝送するものである。
【００１７】
また、本発明の請求項４にかかる放送受信システムは、片方向の通信路を有する第１の無線通信手段と、双方向の通信路を有する第２の無線通信手段と、前記第１および第２の無線通信手段に接続される放送受信端末と、アンテナで受信したＴＶ放送・衛星放送の受信信号、あるいはケーブルテレビ回線からの受信信号を前記第１の無線通信手段を介して前記放送受信端末に再送信し、前記第２の無線通信手段とも接続された再送信手段と、電気通信網に接続され、前記第２の無線通信手段を介して前記放送受信端末との間でデータ信号を送受信する電気通信網アクセス終端手段と、前記放送受信端末に設けられ、前記再送信手段の動作を制御する制御信号を前記第２の無線通信手段を介して前記再送信手段に伝送する再送信手段制御手段と、前記第１の無線通信手段を介して受信した信号の品質を検出する信号品質検出手段と、前記再送信手段制御手段より伝送された制御信号を受け、前記再送信手段の送信周波数を制御する周波数制御手段とを備え、前記再送信手段制御手段は前記信号品質検出手段により検出された信号品質に応じた制御信号を前記第２の無線通信手段を介して前記周波数制御手段に伝送するものである。
【００１９】
【発明の実施の形態】
（実施の形態１）
以下、本発明の実施の形態１にかかる放送受信端末システムについて図面を用いて説明する。図１は本実施の形態１による放送受信システムの構成を示すブロック図であり、図７と同一符号は同一、または相当部分を示している。図１において、２００は放送信号を再送信する再送信手段であり、第２の無線通信手段である双方向無線通信回線８との間で通信を行う双方向通信部２３、再送信手段２の送信動作の制御を行う、再送信手段制御手段となる動作制御部２４とが新たに追加されている。
【００２０】
以上のように構成された本実施の形態の放送受信システムについて、以下、従来例と異なる、放送受信端末４から再送信手段２００を制御する部分の動作について説明する。
【００２１】
まず、放送受信端末４の動作について説明する。制御部４５は操作部４６の放送受信を開始する指示信号により、放送受信端末４の動作を開始すると共に、双方向通信部４７に再送信手段２の動作を制御する所定のデータを出力する。双方向通信部４７に入力されたデータは、所定の符号化、及び変調をされた後、双方向無線通信回線８に送出される。
【００２２】
次に再送信手段２００の動作について説明する。再送信手段２００を構成する双方向通信部２３は双方向無線通信回線８からの信号に対して所定の復調、及び復号化した後、放送受信端末４が再送信手段２００に対して送出したデータを選択し、再送信手段２００を構成する動作制御部２４に出力する。動作制御部２４はこのデータに基づき、周波数変換部２１と送信部２２の動作を開始し、再送信手段２００が放送信号供給線１からの信号を片方向通信回線３に再送信する動作を開始する。また、操作部４６の操作により、放送受信を停止するときにも同様の動作にて再送信手段２００の動作を停止する。こうして放送受信端末４の動作に応じて再送信手段２００の動作を制御することができ、視聴に必要な時だけ再送信手段２００による放送信号の再送信を行うことができる。
【００２３】
このように本実施の形態によれば、再送信手段２００に双方向通信部２３と動作制御部２４を設け、放送受信端末４を構成する双方向通信部４７と通信するように構成し、放送受信端末４の指示によって再送信手段２００の動作制御部２４によってその動作を制御するようにしたので、視聴に必要な時のみ無線通信回線を有効にすることができ、効率的な放送信号の伝送を実現することができる。
【００２４】
（実施の形態２）
次に本発明の実施の形態２による放送受信システムについて説明する。図２は本実施の形態２による放送受信システムの構成を示すブロック図であり、図において、図１または図７と同一符号は同一、または相当部分を示し、２０１は放送信号を再送信する再送信手段であり、従来の構成に加えて、図１で示した双方向通信手段２３と、再送信手段２０１の送信部２２が送出する電波の送出方向を変えるためのアンテナ駆動部２５が設けられている点が異なる。
【００２５】
以上のように構成された本実施の形態２の放送受信システムについて、以下、従来例と異なる、放送受信端末４から再送信手段２０１が送出する電波の送出方向を制御する部分の動作について説明する。
【００２６】
まず、放送受信端末４の動作について説明する。操作部４６により入力された所定のアンテナ操作指示は、制御部４５に入力され、制御部４５から所定のデータとして双方向通信部４７に出力される。双方向通信部４７に入力されたデータは、所定の符号化、及び変調をされた後、双方向無線通信回線８に送出される。
【００２７】
次に再送信手段２０１の動作について説明する。再送信手段２０１の双方向通信部２３は、双方向無線通信回線８からの信号を所定の復調、及び復号化した後、放送受信端末４が再送信手段２０１に対して送出したデータを選択し、アンテナ駆動部２５に出力する。アンテナ駆動部２５はこのデータに基づき、送信部２２に対し、送信部２２に備えられたアンテナ（図示せず）の向きを制御する信号を出力する。送信部２２では、この信号によりアンテナの向きを制御し、送信部２２が送信する電波の方向を変える。こうして放送受信端末４の操作に応じて再送信手段２０１から送出される電波の送出方向を制御することができ、放送受信端末４で受信する再送信手段２０１からの電波を効率よく受信することができる。
【００２８】
このように本実施の形態２によれば、再送信手段２０１に双方向通信部２３とアンテナ駆動部２５を設け、放送受信端末４を構成する双方向通信部４７と通信するように構成し、放送受信端末４の指示によって再送信手段２０１のアンテナ駆動部２５によってアンテナの向きを制御するようにしたので、電波を効率よく受信することができる。
【００２９】
（実施の形態３）
次に本発明の実施の形態３による放送受信システムについて説明する。図３は本実施の形態２による放送受信システムの構成を示すブロック図であり、図において、図１または図２と同一符号は同一、または相当部分を示し、２０２は放送信号を再送信する再送信手段であり、図２で示したアンテナ駆動部２５に代えて、再送信手段２０２の送信部２２が送出する電波の送信電力を制御する電力制御部２６が設けられ、また、放送受信端末４０１には放送受信端末４０１の受信部４１が受信する電波の電界強度を検出する電界検出部４８が新たに設けられている点が異なる。
【００３０】
以上のように構成された本実施の形態の放送受信システムについて、以下、従来例と異なる、放送受信端末４０１が受信する電波の電界強度に応じて再送信手段２０２が送出する電波の送信電力を制御する部分の動作について説明する。
まず、放送受信端末４０１の動作について説明する。電界検出部４８は受信部４１が受信した電波の電界強度の強さを検出し、検出した電界強度に応じた信号を制御部４５に出力する。制御部４５は入力された信号を所定のデータとして双方向通信部４７に出力する。双方向通信部４７に入力されたデータは所定の符号化、及び変調をされた後、双方向無線通信回線８に送出される。
【００３１】
次に再送信手段２０２の動作について説明する。再送信手段２０２の双方向通信部２３は、双方向無線通信回線８からの信号を所定の復調、及び復号化した後、放送受信端末４０１が再送信手段２０２に対して送出したデータを選択し、電力制御部２６に出力する。電力制御部２６はこのデータに基づき、送信部２２に対し、送信部２２が送出する電波の送信電力を増減する。こうして放送受信端末４０１が受信した電波の電界強度に応じて、再送信手段２０２から送出される電波の送信電力を制御することができ、放送受信端末４０１が放送受信に必要最小限の電波を再送信手段２０２に出力するように制御することができる。
【００３２】
このように本実施の形態３によれば、再送信手段２０２に双方向通信部２３と電力制御部２６を設け、放送受信端末４０１を構成する電界検出部４８によって検出される電界強度に応じて、双方向通信部４７を用いて再送信手段２０１の電力制御部２６を制御するようにしたので、放送受信に必要最小限の電波を再送信手段に出力することができ、電波を効率よく送信／受信することができる。
【００３３】
（実施の形態４）
次に本発明の実施の形態４にかかる法送受信システムについて説明する。図４は本実施の形態４による放送受信システムの構成を示すブロック図であり、図において、図１または図２,図７と同一符号は同一または相当部分を示し、上記実施の形態２における放送受信端末４を実施の形態３における放送受信端末４０１に代え、放送受信端末で検出される電界強度に応じて、再送信手段２０１を構成する送信部２２に備えられたアンテナ（図示せず）の向きを制御するようにしたものである。
【００３４】
以上のように構成された本実施の形態の放送受信システムについて、以下、従来例と異なる、放送受信端末４０１が受信する電波の電界強度に応じて、再送信手段２０１が送出する電波の方向を制御する部分の動作について説明する。
【００３５】
まず、放送受信端末４０１の動作について説明する。電界検出部４８は受信部４１が受信した電波の電界強度の強さを検出し、検出した電界強度に応じた信号を制御部４５に出力する。制御部４５は入力された信号を所定のデータとして双方向通信部４７に出力する。双方向通信部４７に入力されたデータは、所定の符号化、及び変調をされた後、双方向無線通信回線８に送出される。
【００３６】
次に再送信手段２０１の動作について説明する。再送信手段２０１の双方向通信部２３は、双方向無線通信回線８からの信号を所定の復調、及び復号化した後、放送受信端末４０１が再送信手段２０１に対して送出したデータを選択し、アンテナ駆動部２５に出力する。アンテナ駆動部２５はこのデータに基づき、送信部２２に対し、送信部２２に備えられたアンテナの向きを制御する信号を出力する。送信部２２ではこの信号により、アンテナの向きを制御し送信部２２が送信する電波の方向を変える。こうして放送受信端末４０１が受信した電波の信号強度に応じて再送信手段２０１から送出される電波の送出方向を制御することができ、放送受信端末４０１で受信する再送信手段２０１からの電波が最大になるように再送信手段２０１の送出する電波の方向を制御することができる。
【００３７】
このように本実施の形態４によれば、再送信手段２０１に双方向通信部２３とアンテナ駆動部２５を設け、放送受信端末４０１を構成する電界検出部４８によって検出される電界強度に応じて、双方向通信部４７を用いて再送信手段２０１のアンテナ駆動部２５を制御するようにしたので、放送受信端末４０１で受信される電波の効率を高めることができる。
【００３８】
（実施の形態５）
次に本発明の実施の形態５にかかる放送受信システムについて説明する。図５は本実施の形態５による放送受信システムの構成を示すブロック図であり、図において、図１、または図７と同一符号は同一、または相当部分を示し、２０３は再送信手段であり、従来よりある周波数変換部２１，送信部２２に加えて、双方向無線通信回線８との間で通信を行う双方向通信部２３と、上記周波数変換部２１が変換する周波数を制御する周波数制御部が加えられている。また、４０２は放送受信端末であり、図７で示した従来の構成に加えて、放送受信端末４０２が受信した信号のデータ誤り頻度を検出する誤り検出部４９が新たに設けられている。
【００３９】
以上のように構成された本実施の形態の放送受信システムについて、以下、従来例と異なる、放送受信端末４０２が受信する信号のデータ誤り頻度により、再送信手段２０３が送出する電波の周波数帯を制御する部分の動作について説明する。
【００４０】
まず、放送受信端末４０２の動作について説明する。誤り検出部４９は放送信号復調部４３が復調した信号からデータ誤りを検出し、データの誤り頻度に応じた信号を制御部４５に出力する。制御部４５は入力された信号を所定のデータとして双方向通信部４７に出力する。双方向通信部４７に入力されたデータは所定の符号化、及び変調をされた後、双方向無線通信回線８に送出される。ここで誤り検出部４９が検出するデータ誤りは、受信する電波が弱い場合以外に、片方向無線通信回線３が他の通信回線との交錯することによる混信から発生するものである。
【００４１】
次に再送信手段２０３の動作について説明する。再送信手段２０３を構成する双方向通信部２３は、双方向無線通信回線８からの信号を所定の復調、及び復号化した後、放送受信端末４０２が再送信手段２０３に対して送出したデータを選択し、周波数制御部２７に出力する。周波数制御部２７はこのデータに基づき、周波数変換部２１に対し、周波数変換部２１で変換する周波数を変更する信号を出力する。周波数変換部２１は放送信号供給線１から入力した信号を所定の周波数帯に変換する際に、上記周波数制御部２７からの信号に応じて変換する周波数帯を変える。こうして放送受信端末４０２が受信した信号のデータ誤り頻度に応じて、再送信手段２０３から送出される電波の周波数帯を変更することができ、放送受信端末４０２で受信する再送信手段２０３からの電波が他の無線回線との混信等によりデータ誤りが多い場合には、再送信手段２０３が送出する電波の周波数帯を変更することにより、混信を回避し、良好に受信することができるように制御することができる。
【００４２】
このように本実施の形態５によれば、再送信手段２０３に双方向通信部２３を設けるとともに、放送受信端末４０２に誤り検出を行う誤り検出部４９とを設け、放送受信端末４０２が受信した信号のデータ誤り頻度に応じて、再送信手段２０３から送出される電波の周波数帯を変更するこことにより、混信を回避して良好な受信を行うことができる。
【００４３】
（実施の形態６）
次に本発明の実施の形態６にかかる放送受信システムについて説明する。図６は本実施の形態６による放送受信システムの構成を示すブロック図であり、図において、図１と同一符号は同一、または相当部分を示し、９は放送信号供給線１と再送信手段２０４との間に接続される多重手段であり、多重部９１，双方向無線通信回線８との間で通信を行う双方向通信部９２とで構成されている。２０４は放送信号を再送信する再送信手段であり、周波数変換部２１，送信部２２に加え、再送信手段２０４において多重された信号を分離する分離部２８と、分離部２８の出力を受けて上記周波数変換部２１，送信部２２の動作を制御する動作制御部２４とを備えている。
【００４４】
以上のように構成された本実施の形態の放送受信システムについて、以下、従来例と異なる、放送受信端末４が多重手段９を介して、再送信手段２０４の動作を制御する部分の動作について説明する。
【００４５】
まず、放送受信端末４の動作について説明する。制御部４５は操作部４６の放送受信を開始する指示信号により、放送受信端末４の動作を開始すると共に、双方向通信部４７に再送信手段２０４の動作を制御する所定のデータを出力する。双方向通信部４７に入力されたデータは所定の符号化、変調をされた後、双方向無線通信回線８に送出される。
【００４６】
次に多重手段９の動作について説明する。多重手段９の双方向通信部９２は、双方向無線通信回線８からの信号を所定の復調、及び復号化した後、放送受信端末４が再送信手段２０４に対して送出したデータを選択し、選択したデータを所定の符号化、及び変調を行った後、多重部９１に出力する。多重部９１では双方向通信部９２の出力信号と放送信号供給線１からの信号を所定の方法で多重し出力する。多重手段９から出力された信号は有線回線を介して接続された再送信手段２０４に入力される。
【００４７】
次に再送信手段２０４の動作について説明する。再送信手段２０４の分離部２８は多重手段９から出力された信号から、双方向通信回線８を介して伝送された放送受信端末４が再送信手段２０４に対して送出した信号と、放送信号供給線１から伝送された信号とを分離し、放送受信端末４が再送信手段２０４に対して送出した信号を動作制御部２４に出力し、放送信号供給線１から伝送された信号を周波数変換部２１に出力する。分離部２８から周波数変換部２１に入力する放送信号供給線１から伝送された信号は、これ以降、従来例と同じ動作によって送信部２２によって電波として出力される。
【００４８】
また、上記分離部２８から動作制御部２４に入力された信号によって、動作制御部２４において、周波数変換部２１と送信部２２の動作を開始し、再送信手段２０４が放送信号供給線１からの信号を片方向通信回線３に再送信する動作を開始する。また、操作部４６の操作により放送受信を停止するときにも同様の動作にて再送信手段２０４の動作を停止する。
【００４９】
こうして、放送受信端末４の動作に応じて双方向無線回線８および多重手段９を介して再送信手段２０４の動作を制御することができ、視聴に必要な時だけ再送信手段２０４による放送信号の再送信を行うように構成することができる。
【００５０】
このように本実施の形態によれば、放送信号供給線１からの信号に放送受信端末４からの制御信号を多重する多重手段９を設け、後段の再送信手段２０４に設けられた分離部２８で上記放送受信端末４からの制御信号を取り出し、これに基づいて周波数変換部２１と送信部２２の動作を制御するようにしたので、放送を受信するときだけ再送信手段２０４を動作させることができ、放送を受信しないときには不必要な無線通信を停止することができる。
【００５１】
なお、本実施の形態では、再送手段２０４の動作の開始、停止のみについて説明しているが、本実施の形態の構成を用いて先に述べた実施の形態２から５に示した放送受信端末と再送手段との間で行う制御と同じ制御をさせることも可能である。
【００５２】
【発明の効果】
以上のように、本発明の請求項１にかかる放送受信システムによれば、再送信手段と放送受信端末との間を双方向通信回線で接続するようにしたので、放送受信端末の操作に応じて再送信手段の動作を制御することができ、動作に必要な時のみ再送信手段からの電波の送出を行うため極めて効率的な動作をさせることがきるという効果が得られる。また、放送受信端末の操作に応じて再送信手段から送出する電波の方向を制御するように構成したので、放送受信端末と再送信手段とが別の部屋等に離れて設置されている場合にも、放送信号を伝送する片方向通信路を最適な状態にすることができ、設置時の利便性が極めて高いという効果が得られる。
【００５３】
また、本発明の請求項２にかかる放送受信システムによれば、放送受信端末で受信する電波の電界強度に応じて、再送信手段から送出する電波の方向を制御するように構成したので、放送受信端末での受信する電波の電界強度が最大となるように、再送信手段の送出する電波の方向を極めて容易に設定することができ利便性が極めて高いという効果が得られる。
【００５４】
また、本発明の請求項３にかかる放送受信システムによれば、放送受信端末で受信する電波の電界強度に応じて、再送信手段から送出する電波の送信電力を制御するように構成したので、放送受信端末で受信に必要な最小限の電波を再送信手段が送信するように容易に設定でき、極めて効率的な動作をさせることができると共に、周囲に対して必要以上の電波送出を抑えることができるという効果が得られる。
【００５６】
また、本発明の請求項４にかかる放送受信システムによれば、放送受信端末で受信する信号の誤り頻度に応じて、放送受信端末と再送信手段との間で設定する片方向無線通信回線の使用周波数帯を変更するように構成したので、他の通信回線との混信を容易に避けることができ、通信の信頼性を極めて向上させることができるという効果が得られる。
【００５８】
また、再送信手段と放送受信端末とをそれぞれ複数設置するような場合には、個々の再送信手段に双方向通信部を設けることなく、１つの多重手段での双方向通信部を用いて有線回線を介してそれそれの再送信手段の動作を制御することができるため、極めて簡単な構成でシステムを実現することができるという効果が得られる。
【図面の簡単な説明】
【図１】本発明の実施の形態１における放送受信システムの構成を示すブロック図である。
【図２】本発明の実施の形態２における放送受信システムの構成を示すブロック図である。
【図３】本発明の実施の形態３における放送受信システムの構成を示すブロック図である。
【図４】本発明の実施の形態４における放送受信システムの構成を示すブロック図である。
【図５】本発明の実施の形態５における放送受信システムの構成を示すブロック図である。
【図６】本発明の実施の形態６における放送受信システムの構成を示すブロック図である。
【図７】従来の放送受信システムの構成を示すブロック図である。
【符号の説明】
１ＴＶ放送・衛星放送を受信するアンテナあるいはケーブルテレビ回線に接続された放送信号供給線
２，２００〜２０４再送信手段
３片方向無線通信回線
４，４０１，４０２放送受信端末
５受像手段
６電気通信網
７電気通信網アクセス終端手段
８双方向無線通信回線
９多重手段
２１周波数変換部
２２送信部
２３,４７，７２，９２双方向通信部
２４動作制御部
２５アンテナ駆動部
２６電力制御部
２７周波数制御部
２８分離部
４１受信部
４２周波数変換部
４３放送信号復調部
４４映像音響信号出力部
４５制御部
４６操作部
４８電界検出部
４９誤り検出部
７１電気通信網終端部
９１多重部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a broadcast receiving system for receiving and watching TV broadcast / satellite broadcast or cable television broadcast, and more particularly, to an apparatus for improving transmission signal transmission efficiency.
[0002]
[Prior art]
In recent years, in addition to conventional terrestrial TV broadcasts, various broadcasts using broadcast / communication satellites and cable television have been started, and broadcast receiving systems have become widespread. Hereinafter, a conventional broadcast receiving system will be described.
[0003]
FIG. 7 is a block diagram showing a configuration of a conventional broadcast receiving system. In FIG. 7, 1 is an antenna for receiving TV broadcast / satellite broadcast, or a broadcast signal supply line connected to a cable TV line, 2 is a retransmitting means for retransmitting a broadcast signal, and 3 is a retransmitter with a broadcast receiving terminal described later A one-way wireless communication line, which is a first wireless communication means, connecting to the transmission means 2, 4 is a broadcast receiving terminal that receives the retransmitted broadcast signal and demodulates the video / audio signal, and 5 is an image receiving means. 6 is a telecommunications network, 7 is a telecommunications network access termination means for terminating the telecommunications network 6, and 8 is a second communication means for connecting the broadcast receiving terminal 4 and the telecommunications network access termination means 7. It is a wireless communication line.
[0004]
Reference numeral 21 denotes a frequency converter that constitutes the retransmission means 2, and 22 denotes a transmission part that constitutes the retransmission means 2. The broadcast receiving terminal 4 includes a receiving unit 41, a frequency converting unit 42, a broadcast signal demodulating unit 43, a video / audio signal output unit 44, a control unit 45, an operation unit 46, and a bidirectional communication unit 47. Further, the telecommunications network access termination means 7 is composed of a telecommunications network termination unit 71 and a bidirectional communication unit 72.
[0005]
The operation of the conventional broadcast receiving system configured as described above will be described below.
First, the operation of the retransmission unit 2 will be described. A broadcast signal from an antenna that receives TV broadcast / satellite broadcast input from the broadcast signal supply line 1 or a cable TV line is input to the frequency converter 21. The frequency conversion unit 21 converts the input signal into a signal of a predetermined frequency band and outputs the signal to the subsequent transmission unit 22. The transmitter 22 amplifies the input signal and transmits it as a radio wave. Thus, the retransmitting means 2 retransmits the input broadcast signal as a radio wave of a predetermined frequency band. In general, since a broadcast signal supplied from the broadcast signal supply line 1 is a broadband signal, a millimeter-wave band frequency is used to retransmit as a radio wave. Therefore, the frequency converter 21 converts the input video signal into a millimeter-wave band signal. The signal transmitted from the retransmitting means 2 is sent to the broadcast receiving terminal 4 via the one-way wireless communication line 3.
[0006]
Next, the operation of the broadcast receiving terminal 4 will be described. The receiving unit 41 receives a signal sent from the rebroadcast means 2 via the one-way wireless communication line 3 and outputs the signal to the frequency converting unit 42. The frequency converter 42 converts the input signal into a signal of a predetermined frequency band. The signal output from the frequency conversion unit 42 by the conversion here returns to the signal before being input to the frequency conversion unit 21 of the retransmitting means 2. The output of the frequency converting unit 42 is input to the broadcast signal demodulating unit 43 and subjected to predetermined demodulation, and signals such as predetermined video signals and audio signals are output from the broadcast signal to the video and audio signal output unit 44. The audiovisual signal output unit 44 outputs to the image receiving means 5.
[0007]
The instruction signal output from the operation unit 46 is input to the control unit 45, and the control unit 45 outputs a control signal corresponding to the instruction signal to the broadcast signal demodulating unit 43, and from the broadcast signal, a predetermined signal corresponding to the control signal is output. A video signal and an audio signal are demodulated. In this way, a video and an acoustic signal corresponding to an instruction from the operation unit 46 can be viewed on the image receiving means 5.
[0008]
Further, the control unit 45 outputs predetermined data to the bidirectional communication unit 47 in response to an instruction signal from the operation unit 46. This predetermined data is data necessary for instructing a broadcast program provider to view a pay broadcast program. The bidirectional communication unit 47 performs predetermined encoding and modulation on the input data, and then sends the data to the telecommunications network access termination means 7 via the bidirectional wireless communication line 8. The bidirectional communication unit 72 of the telecommunications network access termination unit 7 demodulates and decodes the signal input via the bidirectional wireless communication line 8 and outputs the demodulated signal to the telecommunications network termination unit 71. In the telecommunications network termination unit 71, the input signal is subjected to predetermined encoding and modulation corresponding to the telecommunications network 6, and then output to the telecommunications network 6. In this way, data necessary for viewing a pay broadcast program is transmitted to the broadcast program provider via the telecommunication network 6.
[0009]
As described above, the broadcast signal connected to the antenna for receiving TV broadcast / satellite broadcast or the cable TV line by transmitting the broadcast signal and the data necessary for viewing the broadcast program via the wireless line. Even if the broadcast receiving terminal 4 is installed in a place physically separated from the supply line 1 and the telecommunications network 6, for example, in the next room, the broadcast program can be transmitted without newly laying a wired line for connecting them. You can watch. In addition, transmission of a broadcast signal that requires a broadband and unidirectional transmission path is different from data for viewing a broadcast program that needs to be transmitted bidirectionally on a relatively narrow bandwidth transmission path. By transmitting via a wireless line, it is possible to construct a broadcast receiving system at low cost.
[0010]
[Problems to be solved by the invention]
The conventional broadcast receiving system is configured as described above, and the broadcast receiving terminal can be easily arranged at a place away from the broadcast signal supply line and the telecommunications network, and also according to the transmission amount. Although it was convenient that each radio communication line was provided and an inexpensive broadcast receiving system could be constructed, a one-way radio communication line was used to transmit the broadcast signal. Enable the wireless communication line only when necessary, make the directivity of the transmitting antenna and receiving antenna exactly using a highly directional antenna, transmit with the minimum necessary power, etc. When there is interference with other wireless communication lines, it is necessary to change to another frequency. However, when the broadcast receiving terminal 4 shown in FIG. 7 is installed in another room or the like away from the retransmitting means 2, a one-way wireless communication line is used. There is a problem that it is difficult to know and it is difficult to satisfy the conditions necessary for the above efficient transmission.
[0011]
The present invention has been made to solve the above-described problems, and provides a broadcast receiving system capable of efficiently transmitting a broadcast signal even when a broadcast receiving terminal is installed at a location away from the retransmission means. For the purpose.
[0012]
[Means for Solving the Problems]
  A broadcast receiving system according to a first aspect of the present invention includes a first wireless communication unit having a one-way communication path, a second wireless communication unit having a two-way communication path, and the first and second The broadcast receiving terminal connected to the wireless communication means and the TV broadcast / satellite broadcast reception signal received by the antenna or the reception signal from the cable TV line are retransmitted to the broadcast receiving terminal via the first wireless communication means. Transmitting and transmitting and receiving data signals to and from the broadcast receiving terminal via the second wireless communication means connected to a telecommunication network and retransmitting means connected to the second wireless communication means A communication network access termination means; a retransmission means control means provided in the broadcast receiving terminal, for transmitting a control signal for controlling the operation of the retransmission means to the retransmission means via the second wireless communication means;Receiving a control signal transmitted from the retransmitting means control means, and controlling the radio wave transmission direction of the retransmitting means, the radio wave transmission control means for terminal operation of the broadcast receiving terminal. The transmission direction of the radio wave of the retransmission means is controlled by a control signal based onIs.
[0013]
  A broadcast receiving system according to claim 2 of the present invention is the broadcast receiving system according to claim 1.An electric field detecting means for detecting the electric field strength of the signal received via the first wireless communication means, and the retransmission means control means outputs a control signal corresponding to the electric field strength detected by the electric field detecting means. Transmit to the radio wave transmission control meansTo do.
[0015]
  Further, the claims of the present invention3The broadcast receiving system related toA first wireless communication means having a one-way communication path, a second wireless communication means having a bidirectional communication path, a broadcast receiving terminal connected to the first and second wireless communication means, A TV broadcast / satellite broadcast reception signal received by an antenna or a reception signal from a cable television line is retransmitted to the broadcast receiving terminal via the first wireless communication means, and is also connected to the second wireless communication means. A re-transmission means, a telecommunications network access termination means connected to the telecommunications network and transmitting / receiving a data signal to / from the broadcast receiving terminal via the second wireless communication means, and the broadcast receiving terminal A retransmission means control means provided for transmitting a control signal for controlling the operation of the retransmission means to the retransmission means via the second wireless communication means;Electric field detecting means for detecting the electric field strength of the signal received via the first wireless communication means, and power for receiving the control signal transmitted from the retransmission means control means and controlling the transmission power of the retransmission means And a re-transmission means control means for transmitting a control signal corresponding to the electric field strength detected by the electric field detection means to the power control means via the second wireless communication means.
[0017]
  Further, the claims of the present invention4The broadcast receiving system related toA first wireless communication means having a one-way communication path; a second wireless communication means having a bidirectional communication path; a broadcast receiving terminal connected to the first and second wireless communication means; an antenna; The TV broadcast / satellite broadcast reception signal received by the mobile phone or the reception signal from the cable television line is retransmitted to the broadcast receiving terminal via the first wireless communication means, and is also connected to the second wireless communication means. Re-transmission means, telecommunication network access termination means connected to the telecommunication network and transmitting / receiving data signals to / from the broadcast receiving terminal via the second wireless communication means, and provided in the broadcast receiving terminal A retransmission means control means for transmitting a control signal for controlling the operation of the retransmission means to the retransmission means via the second wireless communication means;A signal quality detecting means for detecting the quality of the signal received via the first wireless communication means, and a frequency for receiving a control signal transmitted from the retransmission means control means and controlling a transmission frequency of the retransmission means Control means, and the retransmission means control means transmits a control signal corresponding to the signal quality detected by the signal quality detection means to the frequency control means via the second wireless communication means. .
[0019]
DETAILED DESCRIPTION OF THE INVENTION
(Embodiment 1)
Hereinafter, a broadcast receiving terminal system according to a first exemplary embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a broadcast receiving system according to the first embodiment. The same reference numerals as those in FIG. 7 denote the same or corresponding parts. In FIG. 1, reference numeral 200 denotes a retransmission unit that retransmits a broadcast signal. The bidirectional communication unit 23 that performs communication with the bidirectional wireless communication line 8 that is the second wireless communication unit, and the retransmission unit 2 An operation control unit 24 serving as a retransmission unit control unit for controlling the transmission operation is newly added.
[0020]
In the broadcast receiving system of the present embodiment configured as described above, the operation of the part for controlling the retransmission means 200 from the broadcast receiving terminal 4 that is different from the conventional example will be described below.
[0021]
First, the operation of the broadcast receiving terminal 4 will be described. The control unit 45 starts the operation of the broadcast receiving terminal 4 and outputs predetermined data for controlling the operation of the retransmitting means 2 to the bidirectional communication unit 47 in response to an instruction signal for starting the broadcast reception of the operation unit 46. Data input to the bidirectional communication unit 47 is subjected to predetermined encoding and modulation, and then transmitted to the bidirectional wireless communication line 8.
[0022]
Next, the operation of the retransmission unit 200 will be described. The data transmitted from the broadcast receiving terminal 4 to the retransmitting unit 200 after the bi-directional communication unit 23 constituting the retransmitting unit 200 performs predetermined demodulation and decoding on the signal from the bi-directional wireless communication line 8. Is output to the operation control unit 24 constituting the re-transmission means 200. Based on this data, the operation control unit 24 starts the operation of the frequency conversion unit 21 and the transmission unit 22, and the retransmission unit 200 starts the operation of retransmitting the signal from the broadcast signal supply line 1 to the one-way communication line 3. To do. Further, when the broadcast reception is stopped by the operation of the operation unit 46, the operation of the retransmitting means 200 is stopped by the same operation. Thus, the operation of the retransmitting means 200 can be controlled according to the operation of the broadcast receiving terminal 4, and the retransmitting means 200 can retransmit the broadcast signal only when necessary for viewing.
[0023]
As described above, according to the present embodiment, the re-transmission means 200 is provided with the bidirectional communication unit 23 and the operation control unit 24 so as to communicate with the bidirectional communication unit 47 constituting the broadcast receiving terminal 4. Since the operation is controlled by the operation control unit 24 of the re-transmission means 200 according to an instruction from the receiving terminal 4, the wireless communication line can be validated only when necessary for viewing and transmission of an efficient broadcast signal Can be realized.
[0024]
(Embodiment 2)
Next, a broadcast receiving system according to Embodiment 2 of the present invention will be described. FIG. 2 is a block diagram showing a configuration of a broadcast receiving system according to the second embodiment. In the figure, the same reference numerals as those in FIG. 1 or 7 denote the same or corresponding parts, and 201 denotes a retransmission for retransmitting a broadcast signal. In addition to the conventional configuration, the transmission means is provided with the bidirectional communication means 23 shown in FIG. 1 and an antenna drive section 25 for changing the transmission direction of the radio wave transmitted by the transmission section 22 of the retransmission means 201. Is different.
[0025]
Regarding the broadcast receiving system according to the second embodiment configured as described above, the operation of the part for controlling the transmission direction of the radio wave transmitted from the broadcast receiving terminal 4 from the broadcast receiving terminal 4 will be described below, which is different from the conventional example. .
[0026]
First, the operation of the broadcast receiving terminal 4 will be described. A predetermined antenna operation instruction input by the operation unit 46 is input to the control unit 45, and is output from the control unit 45 to the bidirectional communication unit 47 as predetermined data. Data input to the bidirectional communication unit 47 is subjected to predetermined encoding and modulation, and then transmitted to the bidirectional wireless communication line 8.
[0027]
Next, the operation of the retransmission unit 201 will be described. The bidirectional communication unit 23 of the retransmission means 201 selects data transmitted from the broadcast receiving terminal 4 to the retransmission means 201 after predetermined demodulation and decoding of the signal from the bidirectional wireless communication line 8. And output to the antenna driving unit 25. Based on this data, the antenna drive unit 25 outputs a signal for controlling the direction of an antenna (not shown) provided in the transmission unit 22 to the transmission unit 22. The transmission unit 22 controls the direction of the antenna by this signal and changes the direction of the radio wave transmitted by the transmission unit 22. In this way, the transmission direction of the radio wave transmitted from the retransmitting means 201 can be controlled according to the operation of the broadcast receiving terminal 4, and the radio wave from the retransmitting means 201 received by the broadcast receiving terminal 4 can be received efficiently. it can.
[0028]
As described above, according to the second embodiment, the re-transmission means 201 is provided with the bidirectional communication unit 23 and the antenna driving unit 25 so as to communicate with the bidirectional communication unit 47 constituting the broadcast receiving terminal 4, Since the direction of the antenna is controlled by the antenna driving unit 25 of the re-transmission means 201 according to the instruction from the broadcast receiving terminal 4, radio waves can be received efficiently.
[0029]
(Embodiment 3)
Next, a broadcast receiving system according to Embodiment 3 of the present invention will be described. FIG. 3 is a block diagram showing a configuration of a broadcast receiving system according to the second embodiment. In the figure, the same reference numerals as those in FIG. 1 or 2 denote the same or corresponding parts, and 202 denotes a retransmission for retransmitting a broadcast signal. A power control unit 26 that controls transmission power of radio waves transmitted from the transmission unit 22 of the retransmission unit 202 is provided instead of the antenna driving unit 25 shown in FIG. Is different in that an electric field detecting unit 48 for detecting the electric field strength of the radio wave received by the receiving unit 41 of the broadcast receiving terminal 401 is newly provided.
[0030]
Regarding the broadcast receiving system of the present embodiment configured as described above, the transmission power of the radio wave transmitted by the re-transmission means 202 according to the electric field strength of the radio wave received by the broadcast receiving terminal 401, which is different from the conventional example, is hereinafter described. The operation of the controlled part will be described.
First, the operation of the broadcast receiving terminal 401 will be described. The electric field detection unit 48 detects the strength of the electric field strength of the radio wave received by the reception unit 41 and outputs a signal corresponding to the detected electric field strength to the control unit 45. The control unit 45 outputs the input signal to the bidirectional communication unit 47 as predetermined data. Data input to the bidirectional communication unit 47 is subjected to predetermined encoding and modulation, and then transmitted to the bidirectional wireless communication line 8.
[0031]
Next, the operation of the retransmission unit 202 will be described. The bidirectional communication unit 23 of the retransmission unit 202 selects data transmitted from the broadcast receiving terminal 401 to the retransmission unit 202 after predetermined demodulation and decoding of the signal from the bidirectional wireless communication line 8. And output to the power control unit 26. Based on this data, the power control unit 26 increases or decreases the transmission power of the radio wave transmitted by the transmission unit 22 with respect to the transmission unit 22. Thus, the transmission power of the radio wave transmitted from the retransmission means 202 can be controlled in accordance with the electric field strength of the radio wave received by the broadcast receiving terminal 401, and the broadcast receiving terminal 401 retransmits the minimum radio wave necessary for broadcast reception. It can control to output to the transmission means 202. FIG.
[0032]
As described above, according to the third embodiment, the two-way communication unit 23 and the power control unit 26 are provided in the re-transmission means 202, and the electric field detection unit 48 constituting the broadcast receiving terminal 401 determines the electric field strength. Since the power control unit 26 of the retransmission unit 201 is controlled using the bidirectional communication unit 47, the minimum radio wave necessary for broadcast reception can be output to the retransmission unit, and the radio wave can be transmitted efficiently. / Can be received.
[0033]
(Embodiment 4)
Next, a legal transmission / reception system according to the fourth exemplary embodiment of the present invention will be described. FIG. 4 is a block diagram showing a configuration of a broadcast receiving system according to the fourth embodiment. In the figure, the same reference numerals as those in FIG. 1, FIG. 2, and FIG. The reception terminal 4 is replaced with the broadcast reception terminal 401 in the third embodiment, and an antenna (not shown) provided in the transmission unit 22 constituting the re-transmission means 201 according to the electric field strength detected by the broadcast reception terminal. The direction is controlled.
[0034]
Regarding the broadcast receiving system of the present embodiment configured as described above, the direction of the radio wave transmitted by the retransmitting means 201 is changed according to the electric field strength of the radio wave received by the broadcast receiving terminal 401, which is different from the conventional example. The operation of the controlled part will be described.
[0035]
First, the operation of the broadcast receiving terminal 401 will be described. The electric field detection unit 48 detects the strength of the electric field strength of the radio wave received by the reception unit 41 and outputs a signal corresponding to the detected electric field strength to the control unit 45. The control unit 45 outputs the input signal to the bidirectional communication unit 47 as predetermined data. Data input to the bidirectional communication unit 47 is subjected to predetermined encoding and modulation, and then transmitted to the bidirectional wireless communication line 8.
[0036]
Next, the operation of the retransmission unit 201 will be described. The bidirectional communication unit 23 of the retransmission unit 201 selects data transmitted from the broadcast receiving terminal 401 to the retransmission unit 201 after predetermined demodulation and decoding of the signal from the bidirectional wireless communication line 8. And output to the antenna driving unit 25. Based on this data, the antenna drive unit 25 outputs a signal for controlling the direction of the antenna provided in the transmission unit 22 to the transmission unit 22. With this signal, the transmitter 22 controls the direction of the antenna and changes the direction of the radio wave transmitted by the transmitter 22. Thus, the transmission direction of the radio wave transmitted from the retransmitting means 201 can be controlled in accordance with the signal strength of the radio wave received by the broadcast receiving terminal 401, and the radio wave from the retransmitting means 201 received by the broadcast receiving terminal 401 is the maximum. The direction of the radio wave transmitted by the retransmitting means 201 can be controlled so that
[0037]
As described above, according to the fourth embodiment, the two-way communication unit 23 and the antenna driving unit 25 are provided in the re-transmission means 201, and the electric field detection unit 48 that configures the broadcast receiving terminal 401 determines the electric field strength. Since the antenna driving unit 25 of the re-transmission means 201 is controlled using the bidirectional communication unit 47, the efficiency of radio waves received by the broadcast receiving terminal 401 can be increased.
[0038]
(Embodiment 5)
Next, a broadcast receiving system according to a fifth embodiment of the present invention will be described. FIG. 5 is a block diagram showing a configuration of a broadcast receiving system according to the fifth embodiment. In the figure, the same reference numerals as those in FIG. 1 or FIG. 7 denote the same or corresponding parts, 203 denotes a retransmission means, In addition to the conventional frequency conversion unit 21 and transmission unit 22, a bidirectional communication unit 23 that communicates with the bidirectional wireless communication line 8, and a frequency control unit that controls the frequency converted by the frequency conversion unit 21 Has been added. Reference numeral 402 denotes a broadcast receiving terminal, and in addition to the conventional configuration shown in FIG. 7, an error detection unit 49 for detecting the data error frequency of the signal received by the broadcast receiving terminal 402 is newly provided.
[0039]
In the broadcast receiving system of the present embodiment configured as described above, the frequency band of the radio wave transmitted by the re-transmission means 203 is different from the conventional example, depending on the data error frequency of the signal received by the broadcast receiving terminal 402. The operation of the part to be controlled will be described.
[0040]
First, the operation of the broadcast receiving terminal 402 will be described. The error detector 49 detects a data error from the signal demodulated by the broadcast signal demodulator 43 and outputs a signal corresponding to the data error frequency to the controller 45. The control unit 45 outputs the input signal to the bidirectional communication unit 47 as predetermined data. The data input to the bidirectional communication unit 47 is subjected to predetermined encoding and modulation, and then transmitted to the bidirectional wireless communication line 8. Here, the data error detected by the error detection unit 49 is caused by crosstalk caused by the unidirectional wireless communication line 3 intermingling with other communication lines, except when the received radio wave is weak.
[0041]
Next, the operation of the retransmission unit 203 will be described. The bidirectional communication unit 23 constituting the retransmission unit 203 demodulates and decodes the signal from the bidirectional wireless communication line 8 and then transmits the data transmitted from the broadcast receiving terminal 402 to the retransmission unit 203. Select and output to the frequency control unit 27. Based on this data, the frequency control unit 27 outputs a signal for changing the frequency converted by the frequency conversion unit 21 to the frequency conversion unit 21. When converting the signal input from the broadcast signal supply line 1 into a predetermined frequency band, the frequency conversion unit 21 changes the frequency band to be converted according to the signal from the frequency control unit 27. Thus, the frequency band of the radio wave transmitted from the retransmission means 203 can be changed in accordance with the data error frequency of the signal received by the broadcast receiving terminal 402, and the radio wave from the retransmission means 203 received by the broadcast receiving terminal 402 can be changed. However, when there are many data errors due to interference with other wireless lines, the interference is prevented by changing the frequency band of the radio wave transmitted by the re-transmission means 203, so that the reception can be performed satisfactorily. can do.
[0042]
As described above, according to the fifth embodiment, the two-way communication unit 23 is provided in the re-transmission means 203, and the error detection unit 49 that performs error detection is provided in the broadcast receiving terminal 402. By changing the frequency band of the radio wave transmitted from the re-transmission means 203 according to the signal data error frequency, it is possible to avoid interference and perform good reception.
[0043]
(Embodiment 6)
Next, a broadcast receiving system according to the sixth embodiment of the present invention will be described. FIG. 6 is a block diagram showing a configuration of a broadcast receiving system according to the sixth embodiment. In the figure, the same reference numerals as those in FIG. 1 denote the same or corresponding parts, and 9 denotes the broadcast signal supply line 1 and the retransmission means 204. And a multiplex unit 91 and a bidirectional communication unit 92 that communicates with the bidirectional wireless communication line 8. Reference numeral 204 denotes retransmission means for retransmitting the broadcast signal. In addition to the frequency conversion section 21 and the transmission section 22, the transmission section 204 receives the output of the separation section 28 for separating the signals multiplexed in the retransmission section 204 and the output of the separation section 28. An operation control unit 24 that controls the operation of the frequency conversion unit 21 and the transmission unit 22 is provided.
[0044]
Regarding the broadcast receiving system of the present embodiment configured as described above, the operation of the part where the broadcast receiving terminal 4 controls the operation of the retransmitting means 204 via the multiplexing means 9 will be described below, which is different from the conventional example. To do.
[0045]
First, the operation of the broadcast receiving terminal 4 will be described. The control unit 45 starts the operation of the broadcast receiving terminal 4 and outputs predetermined data for controlling the operation of the retransmitting unit 204 to the bidirectional communication unit 47 in response to an instruction signal for starting the broadcast reception of the operation unit 46. Data input to the bidirectional communication unit 47 is subjected to predetermined encoding and modulation, and then sent to the bidirectional wireless communication line 8.
[0046]
Next, the operation of the multiplexing means 9 will be described. The bidirectional communication unit 92 of the multiplexing means 9 selects data transmitted from the broadcast receiving terminal 4 to the retransmission means 204 after predetermined demodulation and decoding of the signal from the bidirectional wireless communication line 8, The selected data is subjected to predetermined encoding and modulation, and then output to the multiplexing unit 91. The multiplexing unit 91 multiplexes and outputs the output signal of the bidirectional communication unit 92 and the signal from the broadcast signal supply line 1 by a predetermined method. The signal output from the multiplexing unit 9 is input to the retransmission unit 204 connected via a wired line.
[0047]
Next, the operation of the retransmission unit 204 will be described. The separating unit 28 of the retransmitting unit 204 supplies a signal transmitted from the multiplexing unit 9 to the retransmitting unit 204 transmitted from the broadcast receiving terminal 4 via the bidirectional communication line 8 and a broadcast signal supply. The signal transmitted from the line 1 is separated, the signal transmitted from the broadcast receiving terminal 4 to the re-transmission means 204 is output to the operation control unit 24, and the signal transmitted from the broadcast signal supply line 1 is converted to the frequency conversion unit. To 21. Thereafter, the signal transmitted from the broadcast signal supply line 1 that is input from the separation unit 28 to the frequency conversion unit 21 is output as a radio wave by the transmission unit 22 by the same operation as the conventional example.
[0048]
Further, the operation control unit 24 starts the operations of the frequency conversion unit 21 and the transmission unit 22 by the signal input from the separation unit 28 to the operation control unit 24, and the re-transmission means 204 is transmitted from the broadcast signal supply line 1. The operation of retransmitting the signal to the one-way communication line 3 is started. Further, when the broadcast reception is stopped by the operation of the operation unit 46, the operation of the re-transmission means 204 is stopped by the same operation.
[0049]
Thus, the operation of the retransmission means 204 can be controlled via the bidirectional wireless line 8 and the multiplexing means 9 in accordance with the operation of the broadcast receiving terminal 4, and the broadcast signal of the retransmission means 204 can be transmitted only when necessary for viewing. It can be configured to retransmit.
[0050]
As described above, according to the present embodiment, the multiplexing unit 9 for multiplexing the control signal from the broadcast receiving terminal 4 on the signal from the broadcast signal supply line 1 is provided, and the separation unit 28 provided in the subsequent retransmission unit 204 is provided. Since the control signal from the broadcast receiving terminal 4 is taken out and the operations of the frequency conversion unit 21 and the transmission unit 22 are controlled based on the control signal, the retransmission means 204 can be operated only when the broadcast is received. It is possible to stop unnecessary wireless communication when the broadcast is not received.
[0051]
In the present embodiment, only the start and stop of the operation of the retransmission means 204 are described. However, the broadcast receiving terminals described in the second to fifth embodiments described above using the configuration of the present embodiment. It is also possible to perform the same control as that performed between the receiver and the retransmission means.
[0052]
【The invention's effect】
  As described above, according to the broadcast receiving system of the first aspect of the present invention, the retransmission means and the broadcast receiving terminal are connected by the bidirectional communication line. Thus, the operation of the re-transmission means can be controlled, and the radio wave is transmitted from the re-transmission means only when necessary for the operation, so that an extremely efficient operation can be obtained.In addition, since the direction of the radio wave transmitted from the retransmission means is controlled according to the operation of the broadcast receiving terminal, the broadcast receiving terminal and the retransmission means are installed in separate rooms or the like. In addition, the one-way communication path for transmitting the broadcast signal can be brought into an optimum state, and an effect that the convenience at the time of installation is extremely high can be obtained.
[0053]
  Further, the claims of the present invention2According to the broadcast receiving systemSince the direction of the radio wave transmitted from the retransmission means is controlled according to the electric field strength of the radio wave received at the broadcast receiving terminal, the electric field intensity of the radio wave received at the broadcast receiving terminal is maximized. Therefore, the direction of the radio wave transmitted by the re-transmission means can be set very easily, and the advantage that the convenience is extremely high is obtained.
[0054]
  Further, the claims of the present invention3According to the broadcast receiving system, the transmission power of the radio wave transmitted from the retransmission means is controlled according to the electric field strength of the radio wave received at the broadcast receiving terminal. It is possible to easily set a minimum radio wave to be transmitted by the re-transmission means, to perform an extremely efficient operation, and to suppress unnecessary radio wave transmission to the surroundings.
[0056]
  Further, the claims of the present invention4According to the broadcast receiving system according to the present invention, the use frequency band of the one-way wireless communication line set between the broadcast receiving terminal and the retransmission means is changed according to the error frequency of the signal received by the broadcast receiving terminal. Since it is configured, it is possible to easily avoid interference with other communication lines and to improve the reliability of communication extremely.
[0058]
Further, when a plurality of retransmission means and broadcast receiving terminals are installed, a single communication means using a bidirectional communication section with one multiplexing means is used without providing a bidirectional communication section for each retransmission means. Since the operation of each re-transmission means can be controlled via a line, the system can be realized with a very simple configuration.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of a broadcast receiving system in Embodiment 1 of the present invention.
FIG. 2 is a block diagram showing a configuration of a broadcast receiving system in Embodiment 2 of the present invention.
FIG. 3 is a block diagram showing a configuration of a broadcast receiving system according to Embodiment 3 of the present invention.
FIG. 4 is a block diagram showing a configuration of a broadcast receiving system in Embodiment 4 of the present invention.
FIG. 5 is a block diagram showing a configuration of a broadcast receiving system according to Embodiment 5 of the present invention.
FIG. 6 is a block diagram showing a configuration of a broadcast receiving system in a sixth embodiment of the present invention.
FIG. 7 is a block diagram showing a configuration of a conventional broadcast receiving system.
[Explanation of symbols]
1 Broadcast signal supply line connected to an antenna or cable TV line for receiving TV / satellite broadcasts
2,200 to 204 Retransmission means
3 One-way wireless communication line
4,401,402 Broadcast receiving terminal
5 Image receiving means
6 Telecommunications network
7 Telecommunication network access termination means
8 Two-way wireless communication line
9 Multiplexing means
21 Frequency converter
22 Transmitter
23, 47, 72, 92 Two-way communication unit
24 Operation control unit
25 Antenna driver
26 Power control unit
27 Frequency controller
28 Separation part
41 Receiver
42 Frequency converter
43 Broadcast signal demodulator
44 Audiovisual signal output unit
45 Control unit
46 Operation unit
48 Electric field detector
49 Error detection section
71 Telecommunication network termination
91 Multiplexer

Claims

First wireless communication means having a one-way communication path;
A second wireless communication means having a bidirectional communication path;
A broadcast receiving terminal connected to the first and second wireless communication means;
A TV broadcast / satellite broadcast reception signal received by an antenna or a reception signal from a cable television line is retransmitted to the broadcast receiving terminal via the first wireless communication means, and is also connected to the second wireless communication means. Retransmitted means,
Telecommunications network access termination means connected to a telecommunications network and transmitting and receiving data signals to and from the broadcast receiving terminal via the second wireless communication means;
A retransmission means control means provided in the broadcast receiving terminal, for transmitting a control signal for controlling the operation of the retransmission means to the retransmission means via the second wireless communication means ;
Receiving a control signal transmitted from the retransmission means control means, and comprising a radio wave transmission control means for controlling a radio wave transmission direction of the retransmission means,
The radio wave transmission control means controls a radio wave transmission direction of the retransmission means by a control signal based on a terminal operation of the broadcast receiving terminal.
A broadcast receiving system characterized by the above.

The broadcast receiving system according to claim 1 , wherein
Electric field detecting means for detecting the electric field strength of the signal received via the first wireless communication means;
It said retransmission means control unit transmits a control signal corresponding to the electric field intensity detected by the field detecting means to said radio transmission control means,
A broadcast receiving system characterized by the above.

First wireless communication means having a one-way communication path;
A second wireless communication means having a bidirectional communication path;
A broadcast receiving terminal connected to the first and second wireless communication means;
A TV broadcast / satellite broadcast reception signal received by an antenna or a reception signal from a cable television line is retransmitted to the broadcast receiving terminal via the first wireless communication means, and is also connected to the second wireless communication means. Retransmitted means,
Telecommunications network access termination means connected to a telecommunications network and transmitting and receiving data signals to and from the broadcast receiving terminal via the second wireless communication means;
A retransmission means control means provided in the broadcast receiving terminal, for transmitting a control signal for controlling the operation of the retransmission means to the retransmission means via the second wireless communication means;
Electric field detection means for detecting the electric field strength of the signal received via the first wireless communication means;
Power control means for receiving a control signal transmitted from the retransmission means control means and controlling transmission power of the retransmission means;
The retransmission means control means transmits a control signal corresponding to the electric field intensity detected by the electric field detection means to the power control means via the second wireless communication means ;
A broadcast receiving system characterized by the above.

First wireless communication means having a one-way communication path;
A second wireless communication means having a bidirectional communication path;
A broadcast receiving terminal connected to the first and second wireless communication means;
A TV broadcast / satellite broadcast reception signal received by an antenna or a reception signal from a cable television line is retransmitted to the broadcast receiving terminal via the first wireless communication means, and is also connected to the second wireless communication means. Retransmitted means,
Telecommunications network access termination means connected to a telecommunications network and transmitting and receiving data signals to and from the broadcast receiving terminal via the second wireless communication means;
A retransmission means control means provided in the broadcast receiving terminal, for transmitting a control signal for controlling the operation of the retransmission means to the retransmission means via the second wireless communication means;
Signal quality detection means for detecting the quality of the signal received via the first wireless communication means;
Receiving a control signal transmitted from the retransmission means control means, and a frequency control means for controlling a transmission frequency of the retransmission means,
It said retransmission means control unit transmits a control signal corresponding to the signal quality detected by the signal quality detection means to said frequency control means via said second wireless communication means,
A broadcast receiving system characterized by the above.