JP4426704B2

JP4426704B2 - Joint receiving equipment

Info

Publication number: JP4426704B2
Application number: JP2000210559A
Authority: JP
Inventors: 彰男杉山; 正裕大津; 重光鳥山; 正明長瀬; 聖佐々木
Original assignee: Maspro Denkoh Corp
Current assignee: Maspro Denkoh Corp
Priority date: 2000-06-06
Filing date: 2000-06-06
Publication date: 2010-03-03
Anticipated expiration: 2020-06-06
Also published as: JP2001352461A

Description

【０００１】
【発明が属する技術分野】
本発明は、双方向ＣＡＴＶシステムで使用する双方向の共同受信機器に関するもので、さらに詳しくは１個の機器で、第一の信号周波数と第二の信号周波数と第三の信号周波数と第四の信号周波数とを効率よく入力、出力するようにした共同受信機器。
【０００２】
【従来の技術】
従来の技術としては、個々の信号を入力端子に入力して混合し、出力端子へ出力するためのものはあるが、多くのフィルタで構成したりして相互の電気的な整合および特性が得られない。所定の出力端子から所定の入力端子に特定の双方向用の上り信号を出力するものはなかった。またこれらの機器では、電気的な性能、コンパクト化、双方向データ通信が必須であるインターネット接続サービスを達成することに非常に困難性があったため、従来の双方向ＣＡＴＶシステムでは、利用者に対してのサービスが十分には行えなかった。
【０００３】
【発明が解決しようとする課題】
上記のような従来の共同受信機器では、利用者において、ＣＡＴＶサービスの供給に問題を生ずる。
【０００４】
本発明は、上記従来の問題点に鑑みなされたもので、利用者に対してのサービスを向上させることを目的としている。
【０００５】
【課題を解決するための手段および発明の効果】
かかる目的を達成するためになされた請求項１に記載の発明は、入力端子に入力された信号を効率よく混合、分配して出力端子に出力することができる。また、出力端子から入力された第四の信号周波数を効率よく入力端子へ出力することができる。それと共に、利用者に対してのサービスの向上を図ることができる。
【０００６】
請求項１に記載の発明では、１個の共同受信機器の中に第一の信号周波数、第二の信号周波数、第三の信号周波数を入力端子に入力して合成するにあたりそのフィルタの組み合わせを最小限にして損失を少なくして分配すると共に第四の信号周波数を出力端子が入力して第一の信号周波数の入力端子に出力できるようにしている。
【０００７】
請求項２に記載の発明では第一の信号周波数、第二の信号周波数、第三の信号周波数をそれぞれの入力端子から入力して複数の出力端子に出力すると共に、第四の信号周波数を複数の出力端子から入力して第一の信号周波数の入力端子に出力するようにしている。
【０００８】
請求項３に記載の発明では、各第一の信号周波数、第二の信号周波数、第三の信号周波数、第四の信号周波数の信号を増幅して、適正なレベルで接続されたケーブルに送出するようにしている。
【０００９】
請求項４に記載の発明では、第二の入力端子に接続された衛星受信機器に電源を重畳しているので１本のケーブルでの接続を可能としている。
【００１０】
請求項５に記載の発明では、各出力端子に接続されたチューナー等の機器から入力された電源を他の出力端子に出力することなく第二の入力端子に出力することができる。
【００１１】
【発明の実施の形態】
以下に、本発明の実施例を図面と共に説明する。まず図１は、共同受信機器としての実施例のＣＡＴＶ双方向増幅器の構成を表す構成図である。図６は、双方向ＣＡＴＶシステムの構成を表す構成図である。図６において、１は住宅で、集合住宅や個別住宅（一戸建て）がある。２はＣＡＴＶシステムからの引込線、３はＣＳ信号を受信するＣＳアンテナ、３ａはＣＳ受信信号をＩＦ帯に変換するＣＳコンバータ、４はＢＳ信号を受信するＢＳアンテナ、４ａはＢＳ受信信号をＩＦ帯に変換するＢＳコンバータ、５は増幅器で、双方向増幅器を示す。６はＢＳ・ＣＳ信号を受信し、映像・音声等信号を出力するチューナ、５６は上記チューナが出力した映像・音声を出力するためのＴＶ受像機、５７はケーブルモデム、５８は情報端末装置、５９はセットトップボックス（以下、ＳＴＢという）である。７は上記ＣＡＴＶ引込線２からの第一の信号周波数（ＶＨＦおよびＵＨＦを含むもので、例えば７０ＭＨｚ〜７７０ＭＨｚである。以下、双方向下り信号という）を入力し、第四の信号周波数（例えば１０ＭＨｚ〜５５ＭＨｚである。以下、双方向上り信号という）を出力する第一の入力端子。８は上記ＣＳコンバータ３ａが出力する第三の信号周波数（衛星通信受信用コンバータ３ａの出力信号、例えば１５２７ＭＨｚ〜２１５０ＭＨｚである。以下、ＣＳ−ＩＦ信号という）を入力するための第三の入力端子、９は上記ＢＳコンバータ４ａが出力する第二の信号周波数（衛星放送受信用コンバータ４ａの出力信号、例えば１０３５ＭＨｚ〜１３３５ＭＨｚである。以下、ＢＳ−ＩＦ信号という）を入力するための第二の入力端子である。尚、ＣＡＴＶ引込線２の代わりに混合器５５の出力信号が接続される可能性がある。混合器５５には、ＶＨＦ受信アンテナ５３、ＵＨＦ受信アンテナ５４がそれぞれ接続されている。１０は増幅器５の第一の出力端子（双方向出力端子）で、上記増幅器に介設された後述する上り信号阻止切換スイッチ１２を操作することにより、双方向または単方向のいずれか一方を選択できる。１１は増幅器５の第二の出力端子（単方向出力端子）で、下り信号のみ出力される。
【００１２】
次に、共同受信機器の構成について、図１に示す通り詳細に説明する。増幅器５には、双方向下り信号を入力するための入力端子７、ＣＳ−ＩＦ信号を入力するための入力端子８、ＢＳ−ＩＦ信号を入力するための入力端子９、１以上の双方向と単方向が切換可能な双方向出力端子１０、単方向出力端子１１、および電源入力のためのプラグ３９が設けられている。また、入力端子７、入力端子８、入力端子９、双方向出力端子１０、単方向出力端子１１には、それぞれ避雷素子が取付けられている。図１において、ユーザーが外部の双方向ＣＡＴＶシステムのセンター装置にインターネット等のデータを送信するため、そのデータをパーソナルコンピュータ等の情報端末装置で生成した際、これをケーブルモデム５７にて外部の双方向ＣＡＴＶシステムで伝送可能な双方向上り信号に変換して送出し、この双方向上り信号は同軸ケーブルを伝送して増幅器５の双方向出力端子１０に入力される。また、同様にＳＴＢ５９の操作ボタンを操作することにより、上記の双方向上り信号が上記双方向出力端子１０に入力される。双方向出力端子１０に入力された双方向上り信号は、後述する電源信号分離フィルタ４１ｂに入力され、上記増幅器５内に取り込まれる。電源信号分離フィルタ４１に入力された双方向上り信号は、後述する双方向上り信号阻止切換スイッチ１２、混合回路としての分配混合回路２７に入力される。他の双方向出力端子１０の双方向上り信号と混合された上り信号は、双方向下り信号、ＢＳ−ＩＦ信号、ＣＳ−ＩＦ信号を阻止し、双方向上り信号を通過するフィルタ１８（例えばローパスフィルタ。以下、ＬＰＦという）、後述する帯域切換回路１７で所定の帯域幅に制限され、利得調整回路１６、増幅回路１５、減衰回路１４で所定レベルに増幅または減衰され、双方向下り信号を阻止し双方向上り信号を通過するフィルタ１３を介してＣＡＴＶ入力端子７へ伝送される。ＣＡＴＶ入力端子７に接続されたケーブルにより、ＣＡＴＶセンター装置へ伝送され、センター装置で処理される。
【００１３】
次に、ＣＡＴＶ引込線２により伝送されてきた双方向下り信号は、増幅器５の入力端子７に入力される。入力端子７に入力された双方向下り信号は、双方向上り信号を阻止し、双方向下り信号のみ通過するフィルタ１９（例えばハイパスフィルタ。以下、ＨＰＦという）に入力され、増幅器５内に取り込まれる。フィルタ１９に入力された双方向下り信号は、８００ＭＨｚ帯の妨害波を除去するためのフィルタ２０（例えばＬＰＦ）、減衰回路２１、利得調整回路２２、増幅回路２３、チルト回路２４、増幅回路２３で所定レベルまで増幅され、ＣＡＴＶ下り信号が通過して、ＢＳ・ＣＳ−ＩＦ信号の通過を阻止するためのフィルタ２５（例えばＬＰＦ）に伝送され、後述する入力端子８、入力端子９からのＢＳ・ＣＳ−ＩＦ信号と合成されて、分配回路３６に入力される。分配回路３６で等分に分配された下り信号（詳しくは双方向下り信号、ＢＳ・ＣＳ−ＩＦ信号が合成された信号）は、第一の下り信号経路としての、双方向上り信号を阻止し、双方向下り信号とＢＳ−ＩＦ信号、ＣＳ−ＩＦ信号を通過するフィルタ２６（例えばＬＰＦ）に入力される。フィルタ２６を通過した信号は、上記の分配混合回路２７に入力されて４分配された後、各々上り信号阻止切換スイッチ回路１２、電源信号分離フィルタ４１を介して双方向出力端子１０に出力されて、双方向出力端子１０に接続された同軸ケーブルを伝送して、ＢＳ・ＣＳチューナ６、ＴＶ受像機５６で受信される。また、分配回路３６で等分に分配された信号は、下り信号の第二の下り信号経路としてのフィルタ２６と同じ特性のフィルタ３７、分配回路３８に入力され、分配回路３８で４分配された下り信号は、上記電源信号分離フィルタ４１を介して単方向出力端子１１に出力される。単方向出力端子１１に接続された同軸ケーブルを伝送してＢＳ・ＣＳチューナ６、ＴＶ受像機５６で受信される。尚、フィルタ３７がなくても性能を満足できる場合は、フィルタ３７を無くしてもよい。
【００１４】
次にＣＳ信号は、ＣＳアンテナ３及びＣＳコンバータ３ａで受信され、ＣＳ−ＩＦ信号がＣＳコンバータ３ａから出力される。ＣＳ−ＩＦ信号は、ＣＳコンバータ３ａと増幅器５の入力端子８の間を、同軸ケーブルで伝送され、入力端子８に入力される。入力端子８に入力されたＣＳ−ＩＦ信号は、後述する電源信号分離フィルタ４９に入力され、増幅器５に取り込まれる。電源信号分離フィルタ４９に入力されたＣＳ−ＩＦ信号は、減衰回路２８、利得調整回路２９、ＣＳ−ＩＦ信号を通過させ、ＢＳ−ＩＦ信号を阻止するフィルタ３０（例えばＨＰＦ）を介して伝送され、後述する入力端子９から伝送されるＢＳ−ＩＦ信号と合成され、増幅回路３４で所定レベルまで増幅され、ＣＡＴＶ下り信号を阻止してＣＳ・ＢＳ−ＩＦ信号のみ通過するフィルタ３５まで伝送される。フィルタ３５を通過したＣＳ・ＢＳ−ＩＦ信号は、上記双方向下り信号と合成され、上記分配回路３６へ伝送される。尚、分配回路３６から双方向出力端子１０、単方向出力端子１１まで伝送される過程は、双方向下り信号の伝送と同一であり、説明が重複するので省略する。
【００１５】
同様にＢＳ信号は、ＢＳアンテナ４及びＢＳコンバータ４ａで受信され、ＢＳ−ＩＦ信号がＢＳコンバータ４ａから出力される。ＢＳ−ＩＦ信号は、ＢＳコンバータ４ａと増幅器５の入力端子９の間を、同軸ケーブルで伝送され、入力端子９に入力される。入力端子９に入力されたＢＳ−ＩＦ信号は、電源信号分離フィルタ４９に入力され、増幅器５に取り込まれる。電源信号分離フィルタ４９に入力されたＢＳ−ＩＦ信号は、減衰回路３１、利得調整回路３２、ＢＳ−ＩＦ信号を通過させ、ＣＳ−ＩＦ信号を阻止するフィルタ３３（例えばＬＰＦ）を介して伝送され、上記ＣＳ−ＩＦ信号と合成されて増幅回路３４に入力される。増幅回路３４から双方向出力端子１０、単方向出力端子１１まで伝送される過程は、ＣＳ−ＩＦ信号の伝送と同一であり、説明が重複するので省略する。
【００１６】
次に、プラグ３９にＡＣ１００Ｖが印加されると、電源回路４０によりＤＣ１５Ｖが出力される。ＤＣ１５Ｖは、増幅回路１５、２３、３４へ供給される。また、ＤＣ１５Ｖは入力端子９に接続された電源信号分離フィルタ４９にも供給される。電源信号分離フィルタ４９は図５に示すように、ＢＳ−ＩＦ信号入力・電源出力端子４９ａとＢＳ−ＩＦ信号出力端子４９ｂの間に、ＢＳ−ＩＦ信号を通過させ、直流または低周波信号を阻止するコンデンサ５１が接続され、電源出力端子４９ａと電源入力端子４９ｃの間に、コンバータの動作用電源として、また、偏波切換用として使用している直流または低周波信号を通過させ、ＢＳ−ＩＦ信号を阻止するチョークコイル５２が接続されている。また、入力端子８に接続された電源分離フィルタ４９も同様の構成であるが、ＣＳ−ＩＦ信号入力・電源出力端子４９ａと電源入力端子４９ｃの間に接続されたチョークコイル５２には、ＣＳコンバータ３ａの動作用電源として、且つ、偏波切換用として使用する直流、および偏波切換用の低周波信号またはパルス信号を通過させる。尚、ＢＳ−ＩＦ信号入力・電源出力端子４９ａが上記入力端子９に接続され、ＢＳ−ＩＦ信号出力端子４９ｂが上記減衰回路３１と接続されている。電源入力端子４９ｃが上記電源回路４０に接続されている。
【００１７】
次に、双方向出力端子１０、単方向出力端子１１に接続されたＣＳ−ＩＦ信号受信中のＣＳチューナ６またはＳＴＢ５９でユーザーが選局すると、選局したチャンネルに対応する偏波切換信号が上記ＣＳチューナ６、ＳＴＢ５９の受信入力端子へ出力される（本実施例ではＤＣ１１Ｖまたは１５Ｖ）。偏波切換信号は、上記ＣＳチューナ６、ＳＴＢ５９と接続された同軸ケーブルを伝送して、双方向出力端子１０または単方向出力端子１１に入力される。双方向出力端子１０、単方向出力端子１１に入力された偏波切換信号は、ＣＳ−ＩＦ信号出力・偏波切換信号入力端子４１ｂに入力される。電源信号分離フィルタ４１は図４に示すように、ＣＳ−ＩＦ信号入力端子４１ａとＣＳ−ＩＦ信号出力・偏波切換信号入力端子４１ｂの間に、ＣＳ−ＩＦ信号を通過させ、直流または低周波信号を阻止するコンデンサ４６が接続され、ＣＳ−ＩＦ信号出力・偏波切換信号入力端子４１ｂと偏波切換信号出力端子４１ｃの間に、直流または低周波信号を通過させ、ＣＳ−ＩＦ信号を阻止するチョークコイル４７とダイオード４８が直列に接続されている。尚、ＣＳ−ＩＦ信号入力端子４１ａが上記上り信号阻止切換スイッチ１２に接続され、ＣＳ−ＩＦ信号出力・偏波切換信号入力端子４１ｂが上記双方向出力端子１０または単方向出力端子１１と接続されている。偏波切換信号出力端子４１ｃが入力端子８に接続された上記電源入力端子４９ｃに接続されている。尚、ダイオード４８は、複数の双方向出力端子１０、単方向出力端子１１により同時にＣＳ受信信号の偏波切換信号が入力された場合、ＢＳ・ＣＳチューナ６、ＳＴＢ５９が故障しないようにするための逆流防止ダイオードである。また、ダイオード４８のＯＲ接続により、双方向出力端子１０、単方向出力端子１１のいずれの端子にもＢＳ・ＣＳチューナ６、ＳＴＢ５９が接続できる。次に、上り信号阻止切換スイッチ１２は図２に示すように、２回路２接点スイッチ５０、双方向上り信号を阻止し双方向下り信号、ＢＳ−ＩＦ信号、ＣＳ−ＩＦ信号を通過するフィルタ４２（例えばＨＰＦ）が図に示すごとく接続されている。２回路２接点スイッチ５０を操作することにより、双方向伝送と単方向伝送を選択できるようになっている。スイッチ５０を５０ａ側に選択すると、ＣＡＴＶ上り信号、ＣＡＴＶ下り信号、ＣＳ−ＩＦ信号、ＢＳ−ＩＦ信号が全て通過できる双方向伝送となる。一方、スイッチ５０を５０ｂ側に選択すると、双方向上り信号を阻止し、下り信号を通過させるフィルタ４２（例えばＨＰＦ）が直列に介設されることになり、ＣＡＴＶ上り信号を阻止して、ＣＡＴＶ下り信号、ＣＳ−ＩＦ信号、ＢＳ−ＩＦ信号のいわゆる下り信号のみ通過できる単方向伝送となる。
【００１８】
次に帯域切換回路１７は、図３に示すように２回路３接点スイッチ４３、双方向上り信号のうち一部の帯域（例えば３０ＭＨｚ〜５５ＭＨｚ）の信号を通過できるフィルタ４４（例えばＨＰＦ）及び、２個の終端抵抗器４５を図のごとく接続したものである。２回路３接点スイッチ４３を操作することにより、双方向上り信号（例えば１０ＭＨｚ〜５５ＭＨｚ）全帯域を通過させるか、または、双方向上り信号の一部帯域（例えば３０ＭＨｚ〜５５ＭＨｚ）のみを通過させるか、または、双方向上り信号の通過を阻止するか、のいずれかを選択させることが可能になっている。具体的には、２回路３接点スイッチ４３で４３ａ側を選択した場合、双方向出力端子１０から入力端子７に対して、双方向上り信号の全帯域の信号が通過できる。また、２回路３接点スイッチ４３で４３ｂ側を選択した場合、双方向出力端子１０から入力端子７に対して、双方向上り信号のうち、一部の帯域の信号のみ通過できる。また、２回路３接点スイッチ４３で４３ｃ側を選択した場合、双方向出力端子１０から入力された双方向上り信号が終端抵抗器４５で終端される。また、利得調整回路１６の一端も終端抵抗器４５で終端されるため、回路インピーダンスを乱すことなく双方向上り信号を阻止することができる。従って、上り信号阻止切換スイッチ１２で単方向を選択するより、入出力間のアイソレーションが高くなるという効果がある。尚、第一の信号周波数伝送経路はフィルタ１９、フィルタ２０、減衰回路２１、利得調整回路２２、増幅器２３、フィルタ２４、フィルタ２５が相当し、第二の信号周波数伝送経路は電源信号分離フィルタ４９、減衰回路３１、利得調整回路３２、フィルタ３３、増幅回路３４、フィルタ３５が相当し、第三の信号周波数伝送経路は電源信号分離フィルタ４９、減衰回路２８、利得調整回路２９、フィルタ３０、増幅回路３４、フィルタ３５が相当し、第四の信号周波数伝送経路はフィルタ１８、帯域切換回路１７、利得調整回路１６、増幅回路１５、減衰回路１４、フィルタ１３が相当する。
【００１９】
増幅器５本体は、アルミダイカスト製で作られているためシールド性がよく、外部からのノイズの影響を受けない。図７において、底面には入力端子７、入力端子８、入力端子９、プラグ３９が突設されており、上面には複数の双方向出力端子１０、単方向出力端子１１が突設されている。図９に示すように、単方向出力端子１１は前後にＬだけ段差を設けている。これは、増幅器５を壁Ｗに設置した際、Ｆ型プラグＣの着脱作業を容易にするためである。尚、６０は台座である。これにより、分電盤のようなせまい場所でも、作業を容易にすることができる。また、図８に示すように各双方向出力端子１０の近くには上り信号阻止切換スイッチ１２が設けているので、集中的に上り信号阻止切換スイッチ１２を設けた場合に比べて、操作ミスを防止できる。また、図７において正面には帯域切換回路１７、フィルタ２４が設けられており、さらに利得調整回路１６、２２、２９、３２、減衰回路１４、２１、２８、３１が図のように設けられている。また、正面右上には、動作状態を示すパイロットランプＰＬが設けられている。パイロットランプＰＬは、動作中にランプが点灯するようになっている。尚、上記実施の形態は、増幅器５が屋内用として使用する場合について説明したが、防水型のケースに収容することにより、屋外で使用するなど、状況に応じて容易に変更できる。
【図面の簡単な説明】
【図１】共同受信機器の構成を示す構成図。
【図２】上り切換スイッチ１２の回路図。
【図３】帯域切換器１７の回路図。
【図４】電源信号分離フィルタ４１の回路図。
【図５】電源信号分離フィルタ４９の回路図。
【図６】共同受信機器を用いたシステムの構成を示す構成図。
【図７】共同受信機器の斜視図。
【図８】共同受信機器の平面図。
【図９】共同受信機器の側面図。
【符号の説明】
１…住宅、２…ＣＡＴＶシステムからの引込線、３ａ…ＣＳコンバータ、４ａ…ＢＳコンバータ、５…増幅器、６…ＢＳ・ＣＳチューナ、７…第一の入力端子、８…第三の入力端子、９…第二の入力端子、１０…第一の出力端子（双方向出力端子）、１１…第二の出力端子（単方向出力端子）、１２…上り信号阻止切換スイッチ、１４…減衰回路、１５…増幅回路、１７…帯域切換回路、４１…電源信号分離フィルタ、４９…電源信号分離フィルタ、５６…テレビまたはＢＳ・ＣＳチューナ内臓のテレビ、５７…ケーブルモデム、５８…情報端末装置[0001]
[Technical field to which the invention belongs]
The present invention relates to a bidirectional joint reception device used in a bidirectional CATV system. More specifically, the present invention relates to a first signal frequency, a second signal frequency, a third signal frequency, and a fourth signal. A joint receiver that efficiently inputs and outputs the signal frequency.
[0002]
[Prior art]
Although there is a conventional technique for inputting individual signals to the input terminals, mixing them, and outputting them to the output terminals, it can be composed of many filters to obtain mutual electrical matching and characteristics. I can't. There is no device that outputs a specific bidirectional uplink signal from a predetermined output terminal to a predetermined input terminal. In addition, with these devices, it has been very difficult to achieve an Internet connection service that requires electrical performance, compactness, and bidirectional data communication. All services could not be performed sufficiently.
[0003]
[Problems to be solved by the invention]
In the conventional joint receiving apparatus as described above, there is a problem in supplying the CATV service to the user.
[0004]
The present invention has been made in view of the above-described conventional problems, and an object thereof is to improve services for users.
[0005]
[Means for Solving the Problems and Effects of the Invention]
In order to achieve the above object, the invention according to claim 1 can efficiently mix and distribute the signal inputted to the input terminal and output it to the output terminal. In addition, the fourth signal frequency input from the output terminal can be efficiently output to the input terminal. At the same time, the service for the user can be improved.
[0006]
In the first aspect of the present invention, when combining the first signal frequency, the second signal frequency, and the third signal frequency into the input terminal in one common receiving device, the combination of the filters is combined. The fourth signal frequency is inputted to the output terminal and outputted to the input terminal of the first signal frequency while being distributed by minimizing the loss and minimizing the loss.
[0007]
In the second aspect of the present invention, the first signal frequency, the second signal frequency, and the third signal frequency are inputted from the respective input terminals and outputted to the plurality of output terminals, and the fourth signal frequency is made plural. Is output from the output terminal of the first signal frequency.
[0008]
In the third aspect of the invention, the signals of the first signal frequency, the second signal frequency, the third signal frequency, and the fourth signal frequency are amplified and sent to cables connected at appropriate levels. Like to do.
[0009]
In the invention according to claim 4, since the power supply is superimposed on the satellite receiver connected to the second input terminal, connection with one cable is possible.
[0010]
According to the fifth aspect of the invention, the power input from a device such as a tuner connected to each output terminal can be output to the second input terminal without being output to the other output terminal.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. First, FIG. 1 is a configuration diagram showing a configuration of a CATV bidirectional amplifier of an embodiment as a joint receiving device. FIG. 6 is a block diagram showing the configuration of a bidirectional CATV system. In FIG. 6, reference numeral 1 denotes a house, which includes an apartment house and an individual house (detached house). 2 is a lead-in line from the CATV system, 3 is a CS antenna that receives a CS signal, 3a is a CS converter that converts a CS received signal into an IF band, 4 is a BS antenna that receives a BS signal, 4a is a BS received signal that is an IF band The BS converter for converting to 5 is an amplifier, which indicates a bidirectional amplifier. 6 is a tuner that receives BS / CS signals and outputs video / audio signals, 56 is a TV receiver for outputting video / audio output by the tuner, 57 is a cable modem, 58 is an information terminal device, 59 is a set top box (hereinafter referred to as STB). Reference numeral 7 is a first signal frequency (including VHF and UHF, for example, 70 MHz to 770 MHz, hereinafter referred to as a bidirectional downlink signal) from the CATV lead-in line 2 and a fourth signal frequency (for example, 10 MHz to 55 MHz, hereinafter referred to as a bidirectional upstream signal). 8 is a third input terminal for inputting the third signal frequency output from the CS converter 3a (the output signal of the satellite communication receiving converter 3a, for example, 1527 MHz to 2150 MHz; hereinafter referred to as a CS-IF signal). , 9 is a second input for inputting a second signal frequency output from the BS converter 4a (output signal of the satellite broadcast receiving converter 4a, for example, 1035 MHz to 1335 MHz, hereinafter referred to as a BS-IF signal). Terminal. Note that the output signal of the mixer 55 may be connected instead of the CATV lead-in line 2. A VHF reception antenna 53 and a UHF reception antenna 54 are connected to the mixer 55. Reference numeral 10 denotes a first output terminal (bidirectional output terminal) of the amplifier 5, which selects either one of bidirectional or unidirectional by operating an upstream signal blocking changeover switch 12 described later provided in the amplifier. it can. Reference numeral 11 denotes a second output terminal (unidirectional output terminal) of the amplifier 5, which outputs only a downstream signal.
[0012]
Next, the configuration of the joint receiving device will be described in detail as shown in FIG. The amplifier 5 includes an input terminal 7 for inputting a bidirectional downstream signal, an input terminal 8 for inputting a CS-IF signal, an input terminal 9 for inputting a BS-IF signal, and one or more bidirectional terminals. A bidirectional output terminal 10, a unidirectional output terminal 11, and a plug 39 for power input are provided. Lightning arresters are attached to the input terminal 7, the input terminal 8, the input terminal 9, the bidirectional output terminal 10, and the unidirectional output terminal 11, respectively. In FIG. 1, when a user transmits data such as the Internet to an external interactive CATV system center device, the data is generated by an information terminal device such as a personal computer. The bidirectional upstream signal is converted into a bidirectional upstream signal that can be transmitted by the CATV system, and the bidirectional upstream signal is transmitted through a coaxial cable and input to the bidirectional output terminal 10 of the amplifier 5. Similarly, by operating the operation button of the STB 59, the bidirectional upstream signal is input to the bidirectional output terminal 10. A bidirectional upstream signal input to the bidirectional output terminal 10 is input to a power supply signal separation filter 41 b described later and is taken into the amplifier 5. The bidirectional upstream signal input to the power supply signal separation filter 41 is input to a bidirectional upstream signal blocking changeover switch 12 described later and a distribution mixing circuit 27 as a mixing circuit. The upstream signal mixed with the bidirectional upstream signal of the other bidirectional output terminal 10 blocks the bidirectional downstream signal, the BS-IF signal, and the CS-IF signal and passes the bidirectional upstream signal (for example, a low-pass filter 18). Filter (hereinafter referred to as LPF), which is limited to a predetermined bandwidth by a band switching circuit 17 to be described later, and is amplified or attenuated to a predetermined level by a gain adjusting circuit 16, an amplifying circuit 15 and an attenuating circuit 14 to block bidirectional downstream signals. Then, the signal is transmitted to the CATV input terminal 7 through the filter 13 that passes the bidirectional upstream signal. The data is transmitted to the CATV center apparatus via a cable connected to the CATV input terminal 7 and processed by the center apparatus.
[0013]
Next, the bidirectional downstream signal transmitted through the CATV lead-in line 2 is input to the input terminal 7 of the amplifier 5. The bidirectional downstream signal input to the input terminal 7 is input to the filter 19 that blocks the bidirectional upstream signal and passes only the bidirectional downstream signal (for example, a high-pass filter; hereinafter referred to as HPF) and is taken into the amplifier 5. . The bidirectional downstream signal input to the filter 19 is filtered by a filter 20 (for example, LPF) for removing 800 MHz band interference waves, an attenuation circuit 21, a gain adjustment circuit 22, an amplification circuit 23, a tilt circuit 24, and an amplification circuit 23. Amplified to a predetermined level, the CATV downstream signal passes, and is transmitted to a filter 25 (for example, LPF) for blocking the passage of the BS · CS-IF signal. It is combined with the CS-IF signal and input to the distribution circuit 36. The downlink signal equally distributed by the distribution circuit 36 (specifically, the bidirectional downlink signal and the signal obtained by combining the BS and CS-IF signals) blocks the bidirectional uplink signal as the first downlink signal path. The signal is input to a filter 26 (for example, LPF) that passes the bidirectional downlink signal, the BS-IF signal, and the CS-IF signal. The signal that has passed through the filter 26 is input to the distribution mixing circuit 27 and divided into four, and then output to the bidirectional output terminal 10 via the upstream signal blocking switch circuit 12 and the power signal separation filter 41, respectively. The coaxial cable connected to the bidirectional output terminal 10 is transmitted and received by the BS / CS tuner 6 and the TV receiver 56. The signal equally distributed by the distribution circuit 36 is input to the filter 37 and the distribution circuit 38 having the same characteristics as the filter 26 as the second downstream signal path of the downstream signal, and is divided into four by the distribution circuit 38. The downstream signal is output to the unidirectional output terminal 11 through the power signal separation filter 41. The coaxial cable connected to the unidirectional output terminal 11 is transmitted and received by the BS / CS tuner 6 and the TV receiver 56. If the performance can be satisfied without the filter 37, the filter 37 may be omitted.
[0014]
Next, the CS signal is received by the CS antenna 3 and the CS converter 3a, and the CS-IF signal is output from the CS converter 3a. The CS-IF signal is transmitted through the coaxial cable between the CS converter 3 a and the input terminal 8 of the amplifier 5 and input to the input terminal 8. The CS-IF signal input to the input terminal 8 is input to a power signal separation filter 49 described later, and is taken into the amplifier 5. The CS-IF signal input to the power supply signal separation filter 49 is transmitted through the attenuation circuit 28, the gain adjustment circuit 29, and the filter 30 (for example, HPF) that passes the CS-IF signal and blocks the BS-IF signal. The signal is combined with a BS-IF signal transmitted from an input terminal 9 to be described later, amplified to a predetermined level by an amplifier circuit 34, transmitted to a filter 35 that blocks the CATV downstream signal and passes only the CS / BS-IF signal. . The CS / BS-IF signal that has passed through the filter 35 is combined with the bidirectional downlink signal and transmitted to the distribution circuit 36. The process of transmission from the distribution circuit 36 to the bidirectional output terminal 10 and the unidirectional output terminal 11 is the same as the transmission of the bidirectional downlink signal, and will not be described because it is redundantly described.
[0015]
Similarly, the BS signal is received by the BS antenna 4 and the BS converter 4a, and the BS-IF signal is output from the BS converter 4a. The BS-IF signal is transmitted between the BS converter 4 a and the input terminal 9 of the amplifier 5 through a coaxial cable and input to the input terminal 9. The BS-IF signal input to the input terminal 9 is input to the power supply signal separation filter 49 and taken into the amplifier 5. The BS-IF signal input to the power supply signal separation filter 49 is transmitted through an attenuation circuit 31, a gain adjustment circuit 32, and a filter 33 (for example, LPF) that passes the BS-IF signal and blocks the CS-IF signal. Are combined with the CS-IF signal and input to the amplifier circuit 34. The process of transmission from the amplifier circuit 34 to the bidirectional output terminal 10 and the unidirectional output terminal 11 is the same as the transmission of the CS-IF signal, and a description thereof is omitted because it is redundant.
[0016]
Next, when AC 100 V is applied to the plug 39, DC 15 V is output by the power supply circuit 40. DC 15 V is supplied to the amplifier circuits 15, 23 and 34. DC 15 V is also supplied to the power signal separation filter 49 connected to the input terminal 9. As shown in FIG. 5, the power signal separation filter 49 allows the BS-IF signal to pass between the BS-IF signal input / power output terminal 49a and the BS-IF signal output terminal 49b and blocks a DC or low frequency signal. The capacitor 51 to be connected is connected, and a DC- or low-frequency signal used as a power source for the operation of the converter and for switching the polarization is passed between the power output terminal 49a and the power input terminal 49c. A choke coil 52 for blocking signals is connected. The power supply separation filter 49 connected to the input terminal 8 has the same configuration, but the choke coil 52 connected between the CS-IF signal input / power supply output terminal 49a and the power supply input terminal 49c includes a CS converter. The direct current used for the operation of 3a and for switching polarization and a low-frequency signal or pulse signal for switching polarization are passed. The BS-IF signal input / power output terminal 49 a is connected to the input terminal 9, and the BS-IF signal output terminal 49 b is connected to the attenuation circuit 31. A power input terminal 49 c is connected to the power circuit 40.
[0017]
Next, when a user selects a channel in the CS tuner 6 or STB 59 that is receiving the CS-IF signal connected to the bidirectional output terminal 10 and the unidirectional output terminal 11, the polarization switching signal corresponding to the selected channel is described above. It is output to the reception input terminal of the CS tuner 6 and STB 59 (DC 11 V or 15 V in this embodiment). The polarization switching signal is transmitted to the bidirectional output terminal 10 or the unidirectional output terminal 11 through the coaxial cable connected to the CS tuner 6 and the STB 59. The polarization switching signal input to the bidirectional output terminal 10 and the unidirectional output terminal 11 is input to the CS-IF signal output / polarization switching signal input terminal 41b. As shown in FIG. 4, the power supply signal separation filter 41 passes the CS-IF signal between the CS-IF signal input terminal 41a and the CS-IF signal output / polarization switching signal input terminal 41b, and allows direct current or low frequency. A capacitor 46 for blocking the signal is connected, and a DC- or low-frequency signal is passed between the CS-IF signal output / polarization switching signal input terminal 41b and the polarization switching signal output terminal 41c to block the CS-IF signal. A choke coil 47 and a diode 48 are connected in series. The CS-IF signal input terminal 41 a is connected to the upstream signal blocking switch 12, and the CS-IF signal output / polarization switching signal input terminal 41 b is connected to the bidirectional output terminal 10 or the unidirectional output terminal 11. ing. A polarization switching signal output terminal 41 c is connected to the power input terminal 49 c connected to the input terminal 8. The diode 48 is used to prevent the BS / CS tuner 6 and the STB 59 from failing when the polarization switching signal of the CS reception signal is simultaneously input from the plurality of bidirectional output terminals 10 and the unidirectional output terminal 11. This is a backflow prevention diode. Also, the BS / CS tuner 6 and the STB 59 can be connected to either the bidirectional output terminal 10 or the unidirectional output terminal 11 by OR connection of the diode 48. Next, as shown in FIG. 2, the upstream signal blocking switch 12 is a two-circuit two-contact switch 50, a filter 42 that blocks a bidirectional upstream signal and passes a bidirectional downstream signal, a BS-IF signal, and a CS-IF signal. (For example, HPF) are connected as shown in the figure. By operating the two-circuit two-contact switch 50, bidirectional transmission and unidirectional transmission can be selected. When the switch 50 is selected to the 50a side, bidirectional transmission is possible through which all CATV upstream signals, CATV downstream signals, CS-IF signals, and BS-IF signals can pass. On the other hand, when the switch 50 is selected to the 50b side, a filter 42 (for example, HPF) that blocks the bidirectional upstream signal and passes the downstream signal is interposed in series, thereby blocking the CATV upstream signal and the CATV. This is unidirectional transmission that allows only so-called downlink signals of downlink signals, CS-IF signals, and BS-IF signals to pass.
[0018]
Next, as shown in FIG. 3, the band switching circuit 17 includes a two-circuit three-contact switch 43, a filter 44 (for example, HPF) that can pass a signal in a part of the band (for example, 30 MHz to 55 MHz) of the bidirectional upstream signal, and Two termination resistors 45 are connected as shown in the figure. By operating the two-circuit, three-contact switch 43, whether to pass the entire band of the bidirectional upstream signal (for example, 10 MHz to 55 MHz) or to pass only the partial band of the bidirectional upstream signal (for example, 30 MHz to 55 MHz) In addition, it is possible to select one of blocking the passage of the bidirectional upstream signal. Specifically, when the 43a side is selected by the two-circuit, three-contact switch 43, the bidirectional output signal can pass from the bidirectional output terminal 10 to the input terminal 7 in all bands. Further, when the 43b side is selected by the two-circuit three-contact switch 43, only signals in a part of the band of the bidirectional upstream signal can pass from the bidirectional output terminal 10 to the input terminal 7. When the 43 c side is selected by the two-circuit three-contact switch 43, the bidirectional upstream signal input from the bidirectional output terminal 10 is terminated by the termination resistor 45. Further, since one end of the gain adjustment circuit 16 is also terminated by the termination resistor 45, a bidirectional upstream signal can be prevented without disturbing the circuit impedance. Therefore, there is an effect that the isolation between the input and the output becomes higher than when the unidirectional direction is selected by the upstream signal blocking switch 12. The first signal frequency transmission path corresponds to the filter 19, the filter 20, the attenuation circuit 21, the gain adjustment circuit 22, the amplifier 23, the filter 24, and the filter 25, and the second signal frequency transmission path corresponds to the power signal separation filter 49. , The attenuating circuit 31, the gain adjusting circuit 32, the filter 33, the amplifying circuit 34, and the filter 35, and the third signal frequency transmission path is the power signal separating filter 49, the attenuating circuit 28, the gain adjusting circuit 29, the filter 30, and the amplifying. The circuit 34 and the filter 35 correspond, and the fourth signal frequency transmission path corresponds to the filter 18, the band switching circuit 17, the gain adjustment circuit 16, the amplification circuit 15, the attenuation circuit 14, and the filter 13.
[0019]
Since the amplifier 5 body is made of aluminum die casting, it has good shielding properties and is not affected by external noise. In FIG. 7, an input terminal 7, an input terminal 8, an input terminal 9, and a plug 39 project from the bottom surface, and a plurality of bidirectional output terminals 10 and a unidirectional output terminal 11 project from the top surface. . As shown in FIG. 9, the unidirectional output terminal 11 has a level difference of L at the front and rear. This is because the F-type plug C can be easily attached and detached when the amplifier 5 is installed on the wall W. Reference numeral 60 denotes a pedestal. Thereby, work can be facilitated even in a small place such as a distribution board. Further, as shown in FIG. 8, since the upstream signal blocking changeover switch 12 is provided near each bidirectional output terminal 10, an operation error is reduced as compared with the case where the upstream signal blocking changeover switch 12 is intensively provided. Can be prevented. In addition, a band switching circuit 17 and a filter 24 are provided on the front side in FIG. 7, and gain adjustment circuits 16, 22, 29, and 32, and attenuation circuits 14, 21, 28, and 31 are provided as shown in the figure. Yes. A pilot lamp PL indicating an operating state is provided at the upper right of the front. The pilot lamp PL is lit during operation. Although the above embodiment has been described for the case where the amplifier 5 is used indoors, the amplifier 5 can be easily changed depending on the situation, such as being used outdoors by being housed in a waterproof case.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing a configuration of a joint reception device.
FIG. 2 is a circuit diagram of an upstream switch 12;
FIG. 3 is a circuit diagram of a band switcher 17;
4 is a circuit diagram of a power supply signal separation filter 41. FIG.
5 is a circuit diagram of a power supply signal separation filter 49. FIG.
FIG. 6 is a configuration diagram showing a configuration of a system using a joint receiving device.
FIG. 7 is a perspective view of a joint receiving device.
FIG. 8 is a plan view of the joint receiving device.
FIG. 9 is a side view of the joint receiving device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Housing, 2 ... Lead-in line from CATV system, 3a ... CS converter, 4a ... BS converter, 5 ... Amplifier, 6 ... BS / CS tuner, 7 ... First input terminal, 8 ... Third input terminal, 9 2nd input terminal, 10 ... 1st output terminal (bidirectional output terminal), 11 ... 2nd output terminal (unidirectional output terminal), 12 ... Upstream signal blocking switch, 14 ... Attenuation circuit, 15 ... Amplifier circuit, 17 ... Band switching circuit, 41 ... Power supply signal separation filter, 49 ... Power supply signal separation filter, 56 ... TV or television with BS / CS tuner, 57 ... Cable modem, 58 ... Information terminal device

Claims

A tuner or television receiver provided as a terminal for receiving broadcast or communication signals, etc., or a joint reception device used in a system for supplying or sending to a computer, a broadband downstream signal including a broadcast wave is a first signal frequency. The output signal of the wideband satellite reception converter is the second signal frequency, the output signal of the wideband satellite reception converter is the third signal frequency, and the first signal frequency is lower than the second signal frequency. The second signal frequency is lower than the third signal frequency. The signals having the first signal frequency, the second signal frequency, and the third signal frequency are respectively input from the provided first input terminal, second input terminal, and third input terminal, and are combined. A plurality of coaxial cables are transmitted to a plurality of output terminals, and a bidirectional signal is input as a signal of the fourth signal frequency from the plurality of output terminals, and the signal of the fourth signal frequency is Output from the first input terminal at a frequency lower than the first signal frequency. A signal having the first signal frequency input to the first input terminal is configured to block the passage of the signal having the fourth signal frequency and pass only the signal having the first signal frequency; The first signal frequency transmission path configured by a filter that blocks the signal frequency of the first signal frequency and the signal of the third signal frequency and passes only the signal of the first signal frequency, and is input to the second input terminal. The signal of the second signal frequency blocks the passage of the signal of the third signal frequency and passes only the signal of the second signal frequency, and the signal of the second signal frequency passed through the filter. A filter that synthesizes the signal and a signal having a third signal frequency, which will be described later, further blocks the passage of the signal having the first signal frequency, and passes the signal having the second signal frequency and the signal having the third signal frequency. Constructed second faith The signal of the third signal frequency input to the frequency transmission path and the third input terminal blocks the signal of the second signal frequency and passes only the signal of the third signal frequency. A filter, a signal having the third signal frequency that has passed through the filter, and a signal having the second signal frequency are combined to prevent the signal having the first signal frequency from passing; From the third signal frequency transmission path composed of a filter that passes the signal of the third signal frequency, the first signal frequency transmission path, the second signal frequency transmission path, the third signal frequency transmission path A distribution circuit that synthesizes each signal and distributes the combined signals of the first signal frequency, the second signal frequency, and the third signal frequency equally to two or more; Output signal, 4th signal frequency The first signal frequency is combined with a filter that passes only the signals of the first signal frequency, the second signal frequency, and the third signal frequency and the signal of the fourth signal frequency described later. A first output terminal for outputting a signal having a second signal frequency and a third signal frequency, and a second output signal of the two distribution circuit is input from a second output terminal. The fourth signal frequency input from the first output terminal is provided with a filter that blocks signals of the four signal frequencies and passes only the signals of the first signal frequency, the second signal frequency, and the third signal frequency. A filter that blocks the signal of the first signal frequency, the second signal frequency, and the third signal frequency and passes only the signal of the fourth signal frequency, and the signal of the first signal frequency. Of the signal of the fourth signal frequency A joint receiving device comprising a fourth signal frequency transmission path constituted by a filter that passes only, and outputting a signal of the fourth signal frequency to the first input terminal.

The joint receiving device according to claim 1, wherein a plurality of output terminals for outputting a signal having a first signal frequency, a second signal frequency, and a third signal frequency, or inputting a signal having a fourth signal frequency; A joint receiving device comprising a plurality of output terminals for outputting signals of a first signal frequency, a second signal frequency, and a third signal frequency.

3. The joint receiving device according to claim 1, wherein the first signal frequency transmission path, the second signal frequency transmission path, the third signal frequency transmission path, and the fourth signal frequency transmission path are on the transmission path. A joint receiving device characterized in that an amplifier circuit for amplifying a signal flowing through each transmission path is provided in any of the above.

4. The joint receiving device according to claim 1, wherein a power signal separation filter is provided between the second input terminal and the second filter, and the satellite receiving device connected to the second input terminal is operated. A joint receiving device characterized by sending power.

5. The joint receiving device according to claim 1, further comprising a power supply separation filter between the first input terminal and the first filter, and each of the output terminals and the first output signal or the second output signal. A power supply separation filter is provided on each output terminal side on the path, the power input / output terminals of both power supply filters are connected, and the power for operating different satellite receivers connected to the third input terminal is sent out. A joint receiving device characterized in that a polarization switching signal is superimposed on the power source.