JP2004186837A

JP2004186837A - Video interphone system for multiple dwelling house

Info

Publication number: JP2004186837A
Application number: JP2002349052A
Authority: JP
Inventors: Naoki Umeda; 直樹梅田; Tomohide Furuya; 智英古屋; Hideo Sakamoto; 英雄阪本; Mitsuharu Ikeda; 光治池田
Original assignee: Matsushita Electric Works Ltd
Current assignee: Panasonic Electric Works Co Ltd
Priority date: 2002-11-29
Filing date: 2002-11-29
Publication date: 2004-07-02
Anticipated expiration: 2022-11-29
Also published as: JP3864896B2

Abstract

PROBLEM TO BE SOLVED: To provide a video interphone system for multiple dwelling house capable of transmitting multiplexed voice, control and video signals on the same line in order to realize wiring / installation work saving through reduction in number of wire pairs. SOLUTION: A shared part apparatus 10, branches 30, 31, and interphones 20, 21 are interconnected by a pair of shared transmission lines A, the interphones 20, 21 and house doorphone slave units 60, 61 are interconnected by a house dependent transmission line B via the branches 30, 31, a video signal, voice signal, and a control signal are frequency-multiplexed on the shared transmission lines A, and when a house calls the interphone 20, power of the house doorphone slave unit 60 is superimposed on the voice signal on the house dependent transmission line B, the branch 30 receiving the power switches an opening / closing path 301 to select an interphone side branch line for a connection destination of the shared part apparatus side trunk line of the shared transmission lines A. COPYRIGHT: (C)2004,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、マンション等の集合住宅用テレビインターホン装置に関するものである。
【０００２】
【従来の技術】
図４に、従来のテレビインターホン装置の一例として、一般的な集合住宅用途のテレビインターホン装置の構成を示す。一般的な集合住宅用途のテレビインターホン装置は、各住戸内で共用玄関先の来訪者と会話することができると共に、来訪者をカメラ付のロビーインターホンで撮像することにより、各住戸内のモニタで来訪者を確認することができる。図４では、このロビーインターホンとして共用部装置１０を備え、各住戸にはインターホン２０が設置され、共用部装置１０からの幹線は分配器４０によって複数の幹線（系統）に分配され、分配後の各幹線は分岐器３０によって各住戸のインターホン２０に分岐される。また、各住戸の個別玄関先には住戸ドアホン子器６０が設けられ、個別玄関先の来訪者が住戸内の住人と会話することができる。
【０００３】
共用部装置１０からは幹線として共用伝送線路Ｄ０が分配器４０を介して配線されており、分配器４０によって２系統に分配される。分配後の共用伝送線路Ｄ０は分岐器３０によって各住戸に分岐された後、インターホン２０に接続される。この共用伝送線路Ｄ０は、一般的に多芯ツイストペアケーブルで構成され、伝送線路Ｄ１、伝送線路Ｄ２、伝送線路Ｄ３は、それぞれ共用伝送線路Ｄ０の同一シース内に収められた一対のケーブルである。
【０００４】
また、インターホン２０から住戸ドアホン子器６０までは一対のケーブルからなる住戸別伝送線路Ｂが配線されている。住戸別伝送線路Ｂは一般に、共用伝送線路Ｄ０とは別シースのケーブルにて配線されるが、共用伝送線路Ｄ０内の一対の伝送線路を用いてもよい。
【０００５】
次に各部の構成について説明する。まず共用部装置１０は、共用部装置１０の内部回路を制御すると共にインターホン２０と通信を行うための制御を行うＣＰＵ１０１と、ＣＰＵ１０１によって伝送線路Ｄ１に制御信号を送出すると共に受信する制御信号送受信回路１０２と、住戸内の住人と会話するため音声信号を出力するスピーカ１０３と、スピーカ１０３への音声信号を増幅するスピーカアンプ１０４と、住戸内の住人と会話するため音声信号を入力するマイク１０５と、マイク１０５からの音声信号を増幅するマイクアンプ１０６と、スピーカアンプ１０４及びマイクアンプ１０６に接続されて２線４線変換回路を含み伝送線路Ｄ２に音声信号を送出すると共に受信する音声回路１０７と、共用玄関先の来訪者を撮像して映像信号を出力するカメラ部１０８と、映像信号をＦＭ変調するＦＭ変調部１０９と、映像信号を増幅する増幅器１１０と、映像信号の不平衡−平衡変換を行って伝送線路Ｄ３に映像信号を送出するとトランス１１１と、本装置にＡＣ１００Ｖを変換した電源を供給する電源部１１２とを備える。
【０００６】
インターホン２０は、インターホン２０の内部回路を制御すると共に共用部装置１０と通信を行うための制御を行うＣＰＵ２０１と、ＣＰＵ２０１によって伝送線路Ｄ１に制御信号を送出すると共に受信する制御信号送受信回路２０２と、共用玄関先及び個別玄関先の来訪者と会話するため音声信号を出力するスピーカ２０３と、スピーカ２０３への音声信号を増幅するスピーカアンプ２０４と、共用玄関先及び個別玄関先の来訪者と会話するため音声信号を入力するマイク２０５と、マイク２０５からの音声信号を増幅するマイクアンプ２０６と、スピーカアンプ２０４及びマイクアンプ２０６に接続されて２線４線変換回路を含み伝送線路Ｄ２に音声信号を送出すると共に受信する音声回路２０７と、伝送線路Ｄ３から映像信号を受信して平衡−不平衡変換を行うトランス２１１と、映像信号を増幅する増幅器２１０と、映像信号をＦＭ復調するＦＭ復調部２０９と、映像信号を表示する表示部２０８と、本装置にＡＣ１００Ｖを変換した電源を供給する電源部２１２と、住戸ドアホン子器６０との通話のための音声双方向増幅回路や音声回路２０７を接続する開閉路回路などで構成されて住戸別伝送線路Ｂに音声信号を送出すると共に受信する子器インターフェース回路２１３と、住戸ドアホン子器６０を動作させるための電源を供給する子器電源部２１４と、住戸別伝送線路Ｂに子器電源部２１４の電源を重畳するためのトランジスタ回路からなる子器電源重畳部２１５とを備える。
【０００７】
分配器４０は、制御信号を伝送する伝送線路Ｄ１、音声信号を伝送する伝送線路Ｄ２をいずれの電気回路も介さず２系統に分配し、映像信号を伝送する伝送線路Ｄ３を映像信号分配トランス４０１によって２系統に分配する。
【０００８】
分岐器３０は、制御信号を伝送する伝送線路Ｄ１、音声信号を伝送する伝送線路Ｄ２をいずれの電気回路も介さず２系統に分岐し、映像信号を伝送する伝送線路Ｄ３を映像信号分岐トランス３０１によって２系統に分岐する。映像信号分岐トランス３０１は、幹線側のインピーダンスが伝送線路Ｄ３の特性インピーダンスより十分高く、分岐側のインピーダンスが伝送線路Ｄ３の特性インピーダンスに整合している。
【０００９】
次にこの従来例の動作について説明する。まず、通話先の住戸番号アドレスを含む制御信号が共用部装置１０の制御信号送受信回路１０２から伝送線路Ｄ１に送出されると、この制御信号はインターホン２０の制御信号送受信回路２０２を介してＣＰＵ２０１に入力され、インターホン２０は制御信号に応じた動作を行う。制御信号は、分配器４０及び分岐器３０において、いずれの電気回路も介さずそれぞれ分岐、分配されるので、共用部装置１０から送出された制御信号は伝送線路Ｄ１に接続される全てのインターホンに伝送され、制御信号に含まれる住戸番号アドレスに該当したインターホンのみが制御信号にしたがって音声回路２０７及び表示部２０８を動作させ、共用部装置１０と通話状態になる。
【００１０】
音声の伝送は一般に、分配器４０及び分岐器３０において、いずれの電気回路も介さず、それぞれ分岐、分配されて、以下のように行われる。共用部装置１０では、伝送線路Ｄ２を伝達された音声信号は、音声回路１０７及びスピーカアンプ１０４を介して、スピーカ１０３から出力され、マイク１０５で入力された音声信号は、マイクアンプ１０６及び音声回路１０７を介して伝送線路Ｄ２に伝達される。また、インターホン２０でも同様に、伝送線路Ｄ２を伝達された音声信号は、音声回路２０７及びスピーカアンプ２０４を介して、スピーカ２０３から出力され、マイク２０５で入力された音声信号は、マイクアンプ２０６及び音声回路２０７を介して伝送線路Ｄ２に伝達される。このように来訪者と住人とは互いに会話することが可能となる。
【００１１】
次に映像信号の伝送について、以下説明する。共用部装置１０内のカメラ部１０８により撮像された来訪者の映像は、映像信号をＦＭ変調部１０９でＦＭ変調した後、増幅器１１０及び不平衡−平衡変換をするためのトランス１１１を介して、伝送線路Ｄ３に出力される。伝送線路Ｄ３は分配器４０により複数の幹線に分配（枝分かれ）させることが可能である。映像信号の分配は図４に示すように映像信号分配トランス４０１を用いる方法や、図示しないが、１入力／複数出力の増幅回路を用いて増幅分配する方法がある。伝送線路Ｄ３の幹線から各住戸へ至る伝送線路には分岐器３０を介在・接続して分岐する。映像信号の分岐には、映像信号分岐トランス３０１を用いる。
【００１２】
分配器４０及び分岐器３０を介してインターホン２０に入力された映像信号は、平衡−不平衡変換のためのトランス２１１及び増幅器２１０を介して、ＦＭ復調部２０９に入力されてＦＭ復調され、住戸内の住人は、表示部２０８にて、来訪者を確認できる。
【００１３】
上記従来例では、映像信号、音声信号、制御信号を別々の伝送線路で伝達しているが、映像信号と音声信号と直流電圧のみを周波数多重して伝達する伝送線路と、制御信号を伝達する伝送線路との２つの伝送線路を備えた集合住宅用テレビインターホン装置や、映像信号と直流電圧のみを周波数多重して伝達する伝送線路と、制御信号を伝達する伝送線路との２つの伝送線路を備えた集合住宅用テレビインターホン装置もあった。（例えば、特許文献１，２参照。）。
【００１４】
また従来技術として、集合住宅ではなく、戸建て住宅のインターホン装置（すなわち分岐器を用いない通信）においては、子器給電用の直流電源、音声信号、制御信号、映像信号を一対の伝送線路で周波数多重して伝送するものがある。図５は、各信号の伝送周波数帯域の概略を示しており、直流電源はＤＣ、音声信号は１ＫＨｚ帯、制御信号はＦＳＫ（ＦｒｅｑｕｅｎｃｙＳｈｉｆｔＫｅｙｉｎｇ）によって１００ＫＨｚ帯、映像信号はＦＭ変調によって１ＭＨｚ帯に分布している。
【００１５】
【特許文献１】
特許第３３１１５３６号公報（６頁右欄第２４行〜第２９行、７頁左欄第２３行〜第３８行、図１２）
【特許文献２】
特開２００２−９４９７４号公報（２頁右欄第１５行〜２１行、３頁右欄第１行〜右欄第１６行、図１（ａ），（ｂ）、図３）
【００１６】
【発明が解決しようとする課題】
従来の集合住宅用途のテレビインターホン装置においては、音声信号、制御信号、映像信号が別線で伝送されることから、ケーブルの対数が多くなり、そのためケーブルが曲がりにくいなど扱いづらく、またケーブルコストも高くなっていた。
【００１７】
さらに、各機器における端子数が多くなるため、結線の仕方がわかりづらく、施工ミスが発生し易いという問題があった。
【００１８】
本発明は、上記事由に鑑みてなされたものであり、その目的は、配線対数を減らすことによる省配線化・省施工化を実現するために、音声信号、制御信号、映像信号を同一線に多重して伝送可能にした集合住宅用テレビインターホン装置を提供することにある。
【００１９】
【課題を解決するための手段】
請求項１の発明は、集合住宅の共用玄関先の来訪者を撮像して映像信号を出力するカメラ、共用玄関先の来訪者が集合住宅の住戸内の住人と会話するため音声信号を入出力するスピーカー及びマイク、通話先住戸のアドレスを含む制御信号を出力すると共に外部からの制御信号を受け取る第１の制御信号送受信手段を具備する共用部装置と、前記共用部装置のカメラからの映像信号を入力されて住戸内の住人が共用玄関先の来訪者を見るためのモニタ、住戸内の住人が来訪者と会話するため音声信号を入出力するスピーカー及びマイク、前記共用部装置との間で制御信号の授受を行う第２の制御信号送受信手段を具備し、自アドレスが前記共用部装置からの制御信号に含まれるアドレスに該当すれば受信した制御信号に基づいて動作するインターホンと、前記共用部装置と前記インターホンとの間を接続し、映像信号、音声信号、及び制御信号が伝送される一対の共用伝送線路と、前記共用部装置から配線される共用伝送線路の幹線から前記インターホンへ共用伝送線路を分岐する分岐器と、前記インターホンとの間で音声信号を授受して、住戸の個別玄関先の来訪者が住戸内の住人と会話するための住戸ドアホン子器と、前記住戸ドアホン子器と前記インターホンとの間を前記分岐器を介して接続し、音声信号が伝送される住戸別伝送線路とから構成され、前記共用部装置は、映像信号、音声信号、及び制御信号を前記共用伝送線路に周波数多重させて送出すると共に、前記共用伝送線路から受信した周波数多重信号を音声信号及び制御信号に分離する第１の信号多重分離手段を備え、前記インターホン装置は、音声信号及び制御信号を前記共用伝送線路に周波数多重させて送出すると共に、前記共用伝送線路から受信した周波数多重信号を映像信号、音声信号、及び制御信号に分離する第２の信号多重分離手段と、前記住戸別伝送線路に前記住戸ドアホン子器へ供給する電源を重畳させる子器電源重畳手段とを備えて、前記分岐器は、前記共用伝送線路の共用部装置側幹線の接続先を前記共用伝送線路の送り側幹線と前記共用伝送線路のインターホン側分岐線とのいずれかに切り替える開閉器と、前記共用部装置側幹線と送り側幹線との間に接続されて制御信号のみを通過させる第１の制御帯域通過手段と、前記共用部装置側幹線とインターホン側分岐線との間に接続されて制御信号のみを通過させる第２の制御帯域通過手段と、前記住戸別伝送線路を接続する第１，第２の端子と、前記第１，第２の端子間を短絡した短絡路と、前記短絡路の信号から前記住戸ドアホン子器への供給電源を分離する電源分離手段と、前記電源分離手段で分離した電源が所定電圧以下であれば前記開閉器による接続先を送り側幹線に維持し、所定電圧以上であれば分離した電源によって前記開閉器による接続先をインターホン側分岐線に切り替える開閉器切り替え手段とを備えることを特徴とする。
【００２０】
請求項２の発明は，請求項１において、前記インターホンの子器電源重畳手段が重畳する前記住戸ドアホン子器への供給電源は、前記住戸ドアホン子器を動作させるための第１の電圧と、前記開閉器を駆動するための前記第１の電圧より高い第２の電圧とのうちいずれかを出力し、前記分岐器の開閉器切り替え手段は前記電源分離手段で分離した電源が前記第１の電圧であれば前記開閉器による接続先を前記共用伝送線路の送り側幹線に維持し、前記第２の電圧であれば前記開閉器による接続を前記共用伝送線路のインターホン側分岐線に切り替えることを特徴とする。
【００２１】
請求項３の発明は、集合住宅の共用玄関先の来訪者を撮像して映像信号を出力するカメラ、共用玄関先の来訪者が集合住宅の住戸内の住人と会話するため音声信号を入出力するスピーカー及びマイク、通話先住戸のアドレスを含む制御信号を出力すると共に外部からの制御信号を受け取る第１の制御信号送受信手段、直流電源を具備する共用部装置と、前記共用部装置のカメラからの映像信号を入力されて住戸内の住人が共用玄関先の来訪者を見るためのモニタ、住戸内の住人が来訪者と会話するため音声信号を入出力するスピーカー及びマイク、前記共用部装置との間で制御信号の授受を行う第２の制御信号送受信手段を具備し、自アドレスが前記共用部装置からの制御信号に含まれるアドレスに該当すれば受信した制御信号に基づいて動作するインターホンと、前記共用部装置と前記インターホンとの間を接続し、映像信号、音声信号、制御信号、及び直流電源が伝送される一対の共用伝送線路と、前記共用部装置から配線される共用伝送線路の幹線から前記インターホンへ共用伝送線路を分岐する分岐器と、前記インターホンとの間で音声信号を授受して、住戸の個別玄関先の来訪者が住戸内の住人と会話するための住戸ドアホン子器と、前記住戸ドアホン子器と前記インターホンとの間を接続し、音声信号が伝送される住戸別伝送線路とから構成され、前記共用部装置は、映像信号、音声信号、制御信号、及び直流電源を前記共用伝送線路に周波数多重させて送出すると共に、前記共用伝送線路から受信した周波数多重信号を音声信号及び制御信号に分離する第１の信号多重分離手段を備え、前記インターホン装置は、音声信号及び制御信号を前記共用伝送線路に周波数多重させて送出すると共に、前記共用伝送線路から受信した周波数多重信号を映像信号、音声信号、制御信号、及び直流電源に分離する第２の信号多重分離手段と、自アドレスが前記共用部装置からの制御信号に含まれるアドレスに該当すれば前記共用部装置の直流電源から供給される電流を消費する負荷とを備えて、前記分岐器は、前記共有伝送線路の幹線と分岐線との間で一対の共有伝送線路の各信号の伝送方向に対して順方向に各々接続した一対のダイオードと、前記共有伝送線路の幹線と分岐線との間に接続されて制御信号のみを通過させる制御帯域通過手段とを備えて、前記一対のダイオードは前記共用部装置の直流電源から供給される電流によって導通することを特徴とする。
【００２２】
請求項４の発明は、請求項３において、前記分岐器は、前記共有伝送線路の幹線と分岐線との間で一対の共有伝送線路の各信号の伝送方向に対して順方向に各々接続した一対の第１のダイオードと、前記共有伝送線路の幹線と分岐線との間に接続されて制御信号のみを通過させる第１の制御帯域通過手段と、分岐後の幹線に一対の共有伝送線路の各信号の伝送方向に対して順方向に各々接続した一対の第２のダイオードと、分岐後の幹線に接続されて制御信号のみを通過させる第２の制御帯域通過手段とを備えて、前記一対の第１及び第２のダイオードは前記共用部装置の直流電源から供給される電流によって導通することを特徴とする。
【００２３】
【発明の実施の形態】
以下、本発明の実施の形態を図面に基づいて説明する。
【００２４】
（実施形態１）
図１に示す本実施形態において、集合住宅用テレビインターホン装置の基本構成は図４に示した従来の集合住宅用テレビインターホン装置の構成と略同様であり、また、図４と同様の構成には同一の符号を付して説明は省略する。
【００２５】
本実施形態において、共用部装置１０、分岐器３０，３１、インターホン２０，２１の各間は一対の共用伝送線路Ａで接続され、インターホン２０は共用伝送線路Ａの幹線から分岐器３０で分岐して接続されて、インターホン２１は共用伝送線路Ａの幹線から分岐器３１で分岐して接続される。インターホン２０，２１と住戸ドアホン子器６０，６１との各間は、分岐器３０，３１を各々介して住戸別伝送線路Ｂで接続されている。
【００２６】
そして、共用部装置１０内で制御信号を送受信する制御信号送受信回路１０２、音声信号を送受信する音声回路１０７、映像信号を送信するトランス１１１は各々、制御信号多重分離部１１５、音声信号多重分離部１１３、及び映像信号多重部１１４を介して共用伝送線路Ａに接続される。
【００２７】
共用部装置１０内の音声信号多重分離部１１３、映像信号多重部１１４及び制御信号多重分離部１１５は、各伝送信号を各伝送周波数帯域毎に多重・分離するためのもので、各信号の伝送周波数帯域は、高い順に、映像信号、制御信号、音声信号となる。音声信号多重分離部１１３は、主にインダクタ等で構成され、音声信号よりも高い映像信号と制御信号との各伝送帯域のインピーダンスを高くするためのものである。また、映像信号多重部１１４は、主にコンデンサ等で構成され、映像信号よりも低い制御信号と音声信号との各伝送帯域のインピーダンスを高くするためのものである。また、制御信号多重分離部１１５は、主にインダクタやコンデンサ等を組み合わせたバンドパスフィルタで構成され、制御信号よりも低い音声信号と制御信号よりも高い映像信号との各伝送帯域のインピーダンスを高くするためのものである。
【００２８】
また、インターホン２０内で制御信号を送受信する制御信号送受信回路２０２、音声信号を送受信する音声回路２０７、映像信号を受信するトランス２１１は各々、制御信号多重分離部２１８、音声信号多重分離部２１６、及び映像信号分離部２１７を介して共用伝送線路Ａに接続される。
【００２９】
インターホン２０内の音声信号多重分離部２１６、映像信号分離部２１７、及び制御信号多重分離部２１８は、各伝送信号を各伝送周波数帯域毎に多重・分離するためのものである。音声信号多重分離部２１６は、主にインダクタ等で構成され、音声信号よりも高い映像信号と制御信号との各伝送帯域のインピーダンスを高くするためのものである。また、映像信号分離部２１７は、主にコンデンサ等で構成され、映像信号よりも低い制御信号と音声信号との各伝送帯域のインピーダンスを高くするためのものである。また、制御信号多重分離部２１８は、主にインダクタやコンデンサ等を組み合わせたバンドパスフィルタで構成され、制御信号よりも低い音声信号と制御信号よりも高い映像信号との各伝送帯域のインピーダンスを高くするためのものである。
【００３０】
インターホン２１もインターホン２０と同様に構成され、住戸ドアホン子器６１を動作させるための電源を供給する子器電源部２２４と、住戸別伝送線路Ｂに子器電源部２２４の電源を重畳するためのトランジスタ回路からなる子器電源重畳部２２５とを備える。
【００３１】
そして分岐器３０，３１は、共用伝送線路Ａの共用部装置側幹線の接続先を共用伝送線路Ａの送り側幹線とインターホン側分岐線とのいずれかに切り替える開閉器３０１，３１１と、共用伝送線路Ａの共用部装置側幹線と送り側幹線との間に接続されて制御信号のみを通過させるバンドパスフィルタで構成される制御信号多重分離部３０２，３１２と、共用伝送線路Ａの共用部装置側幹線とインターホン側分岐線との間に接続されて制御信号のみを通過させるバンドパスフィルタで構成される制御信号多重分離部３０３，３１３と、インターホン２０からの住戸別伝送線路Ｂを接続する端子３０４，３１４と、住戸ドアホン装置６０，６１からの住戸別伝送線路Ｂを接続する端子３０５，３１５と、端子３０４−３０５間及び端子３１４−３１５間を短絡した短絡路３０９，３１９と、音声信号伝送帯域のインピーダンスを高くして、短絡路３０９，３１９の信号からインターホン２０，２１の電源重畳部２１５，２２５で重畳された電源を分離し、この分離した電源によって開閉器３０１，３１１による接続を共用伝送線路Ａのインターホン側分岐線に切り替える開閉路電源分離部３０６，３１６と備える。
【００３２】
開閉器３０１，３１１による経路がどちらに切り替えられている場合にも、制御信号は制御信号多重分離部３０３，３１３を通過することが可能であり、共用部装置１０から送出された制御信号は共用伝送線路Ａに接続される全てのインターホン２０，２１に伝送される。
【００３３】
以下、本実施形態の一連の動作を説明する。共用部装置１０の図示しない呼出釦を来訪者が押下すると、共用部装置１０は、ＣＰＵ１０１より該当住戸の住戸番号アドレスを含んだ制御信号を制御信号送受信回路１０２、制御信号多重分離部１１５を介して共用伝送線路Ａに送出すると共に、ＦＭ変調部１０９よりカメラ部１０８で撮像されてＦＭ変調された映像信号を増幅器１１０、トランス１１１、映像信号多重部１１４を介して送出し、且つスピーカーアンプ１０４、マイクアンプ１０６、音声回路１０７等を動作させる。
【００３４】
そして、音声信号と映像信号と制御信号とは、音声信号多重分離部１１３、映像信号多重部１１４、制御信号多重分離部１１５により共用伝送線路Ａに周波数多重されて伝送される。このとき、分岐器３０，３１の開閉器３０１，３１１による共用伝送線路Ａの共用部装置側幹線の接続先は、共用伝送線路Ａの送り側幹線となっており、制御信号のみが制御信号多重分離部３０３，３１３のバンドパスフィルタを通過した後、再び共用伝送線路Ａの幹線から分岐した共用伝送線路Ａの分岐線に多重されてインターホン２０，２１に至る。
【００３５】
制御信号は共用伝送線路Ａに接続されている分岐器３０，３１の制御信号多重分離部３０３，３１３を介して伝送され、インターホン２０，２１内の制御信号多重分離部２１８及び制御信号送受信回路２０２を介してＣＰＵ２０１に受信される。そして、インターホン２０は自器が呼び出された該当の住戸である場合、制御信号にしたがってスピーカーアンプ２０４、マイクアンプ２０６、音声回路２０７を動作させると共に、子器電源部２１４から子器電源重畳部２１５を介して住戸別伝送線路Ｂに住戸ドアホン子器６０への電源を重畳させる。
【００３６】
住戸別伝送線路Ｂを中継する分岐器３０では、開閉路電源分離部３０６によって短絡路３０９を伝送される信号から電源を分離し、この電源を用いて開閉路３０１を切り替えて共用伝送線路Ａの共用部装置側幹線の接続先をインターホン側分岐線とする。呼び出されていないインターホン２１は住戸ドアホン子器６１に電源を供給しないので、分岐器３１の開閉路３１１は送り側幹線への接続を維持する。
【００３７】
したがって、共用部装置１０で周波数多重された映像信号と音声信号は、分岐器３０の開閉路３０１を介して、インターホン２０にのみ伝送される。インターホン２０では、音声信号多重分離部２１６を介して音声信号を送受信して、共用部装置１０と通話状態になると共に、表示部２０８を動作させ、映像信号分離部２１７を介して受信した映像信号をＦＭ復調部２０９で復調して表示部２０８に映す。これにより、住人は来訪者と会話することができると共に、来訪者をモニタすることができる。
【００３８】
以上のように、本実施形態によれば、共用部装置１０とインターホン２０との間の共用伝送線路Ａに分岐器３０を介在接続した場合においても、映像信号と音声信号と制御信号とを１対の共用伝送線路Ａで伝送することが可能となる。
【００３９】
さらに、共用伝送線路Ａの幹線からインターホン２０，２１へ至る分岐線への分岐を分岐器３０，３１の開閉路３０１，３１１による切替えで実現することにより、映像信号と音声信号を周波数多重したまま分岐器３０，３１を通過させることができる。
【００４０】
また、開閉路３０１，３１１の駆動電源は、分岐器３０，３１からインターホン２０，２１に至る伝送線路Ａ，Ａに平行配線されている住戸別伝送線路Ｂ，Ｂに重畳している。そのため、共用伝送線路Ａには開閉路３０１，３１１を駆動させるための電源分離部を接続する必要がなく、共用伝送線路Ａの音声信号伝送帯域および映像信号伝送帯域のインピーダンス低下は生じない。
【００４１】
なお、本実施形態の図１においては分岐器及びインターホンを各々２つずつ図示しているが、さらに多くの分岐器及びインターホンを同様に備えていてもよい。
【００４２】
（実施形態２）
本実施形態は、図１に示した構成要素のうち、インターホン２０，２１内の子器電源部２１４，２２４を、図２に示すように、住戸ドアホン子器６０，６１を動作させることが可能な第１の電圧レベルＶ１と、分岐器３０，３１内の開閉路３０１，３１１を駆動可能な第２の電圧レベルＶ２との２つの電圧レベルを切り替えて出力できるようにしたものである。
【００４３】
第２の電圧レベルＶ２は第１の電圧レベルＶ１よりも高いレベルに設定されており、分岐器３０，３１内の開閉路電源分離部３０６，３１６は、前述の２つの電圧レベルを識別し、第２の電圧レベルを検出した場合のみ開閉路３０１，３１１を分岐側に切り替え、第１の電圧レベルを検出した場合及び住戸ドアホン子器６０，６１への電源供給が行われていない場合には開閉路３０１，３１１を送り幹線側に接続した状態に維持する。したがって、例えば共用部装置１０とインターホン２０が通話状態にあるときに、共用部装置１０からインターホン２０に至る共用伝送線路Ａに接続されているインターホン２１の住戸ドアホン子器６１が動作することによって、インターホン２１が接続された分岐器３１の開閉路３１１が分岐側に切り替わり、共用部装置１０とインターホン２０との通話が切断されるという不具合が無くなる。
【００４４】
（実施形態３）
図３に示す本実施形態では、図１に示したインターホン２０に開閉器２１９、コンデンサ２２０，２２１を付加して、インターホン２０内で共用伝送線路Ａをコンデンサ２２０を介して制御信号多重分離部２１８に接続し、共用伝送線路Ａとコンデンサ２２０との接続点は開閉器２１９、音声信号多重分離部２１６、コンデンサ２２１の直列回路を介して音声回路２０７に接続し、開閉器２１９と音声信号多重分離部２１６との接続点を映像信号分離部２１７に接続している。開閉器２１９は開放することによって音声信号多重分離部２１６及び映像信号分離部２１７への音声信号と映像信号との伝達を遮断する。また、インターホン２１も開閉器２２９を同様に備える。
【００４５】
また、共用部装置１０は、図１に示した構成に、電源重畳部１１６、コンデンサ１１７，１１８を備えており、電源重畳部１１６は、電源部１１２からの電源をインターホン２０，２１に供給する直流電源として共用伝送線路Ａの音声信号、映像信号、制御信号に重畳するためのものであり、直流電源が不要な音声回路１０７、制御信号多重分離部１１５に対してはコンデンサ１１８，１１７を各々設けて直流電源を阻止している。なお、映像信号多重部１１４もトランス１１１への直流電源入力を阻止するものである。
【００４６】
さらに、インターホン２０は、開閉器２１９と映像信号分離部２１７の接続点と、回路グランドとの間に負荷回路２２２を設け、インターホン２１も同様に負荷回路２３２を設けており、負荷回路２２２，２３２は、共用部装置１０から供給される直流電流を消費するためのものである。直流電源が不要な音声回路２０７、制御信号多重分離部２１８に対してはコンデンサ２２１，２２０を設けて直流電源を阻止している。なお、映像信号分離部２１７もトランス２１１への直流電源入力を阻止するものである。
【００４７】
分岐器３０，３１は、共有伝送線路Ａの幹線と分岐線との間で一対の電線の各信号の伝送方向に対して順方向に各々接続した一対のダイオード組、及び分岐後の幹線に一対の電線の各信号の伝送方向に対して順方向に各々接続した一対のダイオード組３０８，３１８と、共有伝送線路Ａの幹線と分岐線との間に接続されて制御信号のみを通過させるバンドパスフィルタで構成される制御信号多重分離部，及び分岐後の幹線に接続されて制御信号のみを通過させるバンドパスフィルタで構成される制御信号多重分離部３０７，３１７とを備え、２組づつ設けた一対のダイオード組３０８，３１８はＰＩＮダイオードで構成される。
【００４８】
制御信号は制御信号多重分離部３０７，３１７を通過することが可能であり、共用部装置１０から送出された制御信号は伝送線路Ａに接続される全てのインターホンに伝送される。
【００４９】
以下、本実施形態の一連の動作を説明する。共用部装置１０において図示しない呼出釦を来訪者が押下した場合、共用部装置１０から住戸番号アドレスを含む制御信号が制御信号多重分離部３１７，３０７を介して共用伝送線路Ａに接続されている全てのインターホン２０，２１に伝送され、住戸番号アドレスに該当したインターホン２０においてのみ、制御信号を受信したＣＰＵ２１２によって開閉路２１９が閉じられる。開閉路２１９が閉じられると負荷回路２２２が伝送線路Ａに接続され、分岐器３０の共有伝送線路Ａの幹線と分岐線との間に接続したダイオード組３０８、及び分岐器３１の分岐後の幹線に接続したダイオード組３１８に順方向に電流が流れて、負荷回路２２２にて共用部装置１０の電源重畳部１１６で重畳した直流電流が消費される。
【００５０】
そして、共有伝送線路Ａの幹線と分岐線との間に接続したダイオード組３０８、及び分岐後の幹線に接続したダイオード組３１８は順方向電流が流れることにより、導通状態（オン状態）となり、伝送線路Ａの幹線にインターホン２０に至る分岐線が接続された状態になる。
【００５１】
呼び出されていないインターホン２１は開閉路２２９が閉じないので、分岐器３１の共有伝送線路Ａの幹線と分岐線との間に接続したダイオード組３１８はオフ状態のままであり、インターホン２１に至る分岐線は伝送線路Ａの幹線に接続されない。
【００５２】
したがって、共用部装置１０で周波数多重された映像信号と音声信号は分岐器３１の分岐後の幹線に接続したダイオード組３１８、及び分岐器３０の共有伝送線路Ａの幹線と分岐線との間に接続したダイオード組３０８を介して、インターホン２０にのみ伝送され、映像信号と音声信号を周波数多重したまま分岐器を通過させることができる。
【００５３】
【発明の効果】
請求項１の発明は、集合住宅の共用玄関先の来訪者を撮像して映像信号を出力するカメラ、共用玄関先の来訪者が集合住宅の住戸内の住人と会話するため音声信号を入出力するスピーカー及びマイク、通話先住戸のアドレスを含む制御信号を出力すると共に外部からの制御信号を受け取る第１の制御信号送受信手段を具備する共用部装置と、前記共用部装置のカメラからの映像信号を入力されて住戸内の住人が共用玄関先の来訪者を見るためのモニタ、住戸内の住人が来訪者と会話するため音声信号を入出力するスピーカー及びマイク、前記共用部装置との間で制御信号の授受を行う第２の制御信号送受信手段を具備し、自アドレスが前記共用部装置からの制御信号に含まれるアドレスに該当すれば受信した制御信号に基づいて動作するインターホンと、前記共用部装置と前記インターホンとの間を接続し、映像信号、音声信号、及び制御信号が伝送される一対の共用伝送線路と、前記共用部装置から配線される共用伝送線路の幹線から前記インターホンへ共用伝送線路を分岐する分岐器と、前記インターホンとの間で音声信号を授受して、住戸の個別玄関先の来訪者が住戸内の住人と会話するための住戸ドアホン子器と、前記住戸ドアホン子器と前記インターホンとの間を前記分岐器を介して接続し、音声信号が伝送される住戸別伝送線路とから構成され、前記共用部装置は、映像信号、音声信号、及び制御信号を前記共用伝送線路に周波数多重させて送出すると共に、前記共用伝送線路から受信した周波数多重信号を音声信号及び制御信号に分離する第１の信号多重分離手段を備え、前記インターホン装置は、音声信号及び制御信号を前記共用伝送線路に周波数多重させて送出すると共に、前記共用伝送線路から受信した周波数多重信号を映像信号、音声信号、及び制御信号に分離する第２の信号多重分離手段と、前記住戸別伝送線路に前記住戸ドアホン子器へ供給する電源を重畳させる子器電源重畳手段とを備えて、前記分岐器は、前記共用伝送線路の共用部装置側幹線の接続先を前記共用伝送線路の送り側幹線と前記共用伝送線路のインターホン側分岐線とのいずれかに切り替える開閉器と、前記共用部装置側幹線と送り側幹線との間に接続されて制御信号のみを通過させる第１の制御帯域通過手段と、前記共用部装置側幹線とインターホン側分岐線との間に接続されて制御信号のみを通過させる第２の制御帯域通過手段と、前記住戸別伝送線路を接続する第１，第２の端子と、前記第１，第２の端子間を短絡した短絡路と、前記短絡路の信号から前記住戸ドアホン子器への供給電源を分離する電源分離手段と、前記電源分離手段で分離した電源が所定電圧以下であれば前記開閉器による接続先を送り側幹線に維持し、所定電圧以上であれば分離した電源によって前記開閉器による接続先をインターホン側分岐線に切り替える開閉器切り替え手段とを備えるので、集合住宅用途のテレビインターホン装置のように共用部装置とインターホン間の共用伝送線路に分岐器が介在・接続した場合においても、映像信号と制御信号と音声信号とを周波数多重し、１対の共用伝送線路で伝送することが可能となって、対数の少ないケーブルで配線することができ、省配線化・省施工化を実現することができるという効果がある。さらに、映像信号と音声信号を周波数多重したまま、分岐器を通過させることができると共に、映像／音声多重信号の伝送線路には開閉路を駆動するための電源分離部が不要であり、電源分離部の接続による共用伝送線路のインピーダンス低下が生じない。
【００５４】
請求項２の発明は，請求項１において、前記インターホンの子器電源重畳手段が重畳する前記住戸ドアホン子器への供給電源は、前記住戸ドアホン子器を動作させるための第１の電圧と、前記開閉器を駆動するための前記第１の電圧より高い第２の電圧とのうちいずれかを出力し、前記分岐器の開閉器切り替え手段は前記電源分離手段で分離した電源が前記第１の電圧であれば前記開閉器による接続先を前記共用伝送線路の送り側幹線に維持し、前記第２の電圧であれば前記開閉器による接続を前記共用伝送線路のインターホン側分岐線に切り替えるので、住戸ドアホン子器動作時に、開閉路が不必要に切り替わることが無いという効果がある。
【００５５】
請求項３の発明は、集合住宅の共用玄関先の来訪者を撮像して映像信号を出力するカメラ、共用玄関先の来訪者が集合住宅の住戸内の住人と会話するため音声信号を入出力するスピーカー及びマイク、通話先住戸のアドレスを含む制御信号を出力すると共に外部からの制御信号を受け取る第１の制御信号送受信手段、直流電源を具備する共用部装置と、前記共用部装置のカメラからの映像信号を入力されて住戸内の住人が共用玄関先の来訪者を見るためのモニタ、住戸内の住人が来訪者と会話するため音声信号を入出力するスピーカー及びマイク、前記共用部装置との間で制御信号の授受を行う第２の制御信号送受信手段を具備し、自アドレスが前記共用部装置からの制御信号に含まれるアドレスに該当すれば受信した制御信号に基づいて動作するインターホンと、前記共用部装置と前記インターホンとの間を接続し、映像信号、音声信号、制御信号、及び直流電源が伝送される一対の共用伝送線路と、前記共用部装置から配線される共用伝送線路の幹線から前記インターホンへ共用伝送線路を分岐する分岐器と、前記インターホンとの間で音声信号を授受して、住戸の個別玄関先の来訪者が住戸内の住人と会話するための住戸ドアホン子器と、前記住戸ドアホン子器と前記インターホンとの間を接続し、音声信号が伝送される住戸別伝送線路とから構成され、前記共用部装置は、映像信号、音声信号、制御信号、及び直流電源を前記共用伝送線路に周波数多重させて送出すると共に、前記共用伝送線路から受信した周波数多重信号を音声信号及び制御信号に分離する第１の信号多重分離手段を備え、前記インターホン装置は、音声信号及び制御信号を前記共用伝送線路に周波数多重させて送出すると共に、前記共用伝送線路から受信した周波数多重信号を映像信号、音声信号、制御信号、及び直流電源に分離する第２の信号多重分離手段と、自アドレスが前記共用部装置からの制御信号に含まれるアドレスに該当すれば前記共用部装置の直流電源から供給される電流を消費する負荷とを備えて、前記分岐器は、前記共有伝送線路の幹線と分岐線との間で一対の共有伝送線路の各信号の伝送方向に対して順方向に各々接続した一対のダイオードと、前記共有伝送線路の幹線と分岐線との間に接続されて制御信号のみを通過させる制御帯域通過手段とを備えて、前記一対のダイオードは前記共用部装置の直流電源から供給される電流によって導通するので、集合住宅用途のテレビインターホン装置のように共用部装置とインターホン間の共用伝送線路に分岐器が介在・接続した場合においても、映像信号と制御信号と音声信号とを周波数多重し、１対の共用伝送線路で伝送することが可能となって、対数の少ないケーブルで配線することができ、省配線化・省施工化を実現することができるという効果がある。さらに、映像信号と音声信号を周波数多重したまま、分岐器を通過させることができると共に、映像／音声多重信号の伝送線路には開閉路を用いないので、開閉路を駆動するための電源分離部が不要であり、電源分離部の接続による伝送線路のインピーダンス低下が生じない。
【００５６】
請求項４の発明は、請求項３において、前記分岐器は、前記共有伝送線路の幹線と分岐線との間で一対の共有伝送線路の各信号の伝送方向に対して順方向に各々接続した一対の第１のダイオードと、前記共有伝送線路の幹線と分岐線との間に接続されて制御信号のみを通過させる第１の制御帯域通過手段と、分岐後の幹線に一対の共有伝送線路の各信号の伝送方向に対して順方向に各々接続した一対の第２のダイオードと、分岐後の幹線に接続されて制御信号のみを通過させる第２の制御帯域通過手段とを備えて、前記一対の第１及び第２のダイオードは前記共用部装置の直流電源から供給される電流によって導通するので、分岐器より後段への必要のない映像／音声多重信号の伝送を防止できるという効果がある。
【図面の簡単な説明】
【図１】本発明の実施形態１の構成を示す図である。
【図２】本発明の実施形態２の構成の一部を示す図である。
【図３】本発明の実施形態３の構成を示す図である。
【図４】従来例の構成を示す図である。
【図５】同上の信号の伝送周波数帯域を示す図である。
【符号の説明】
１０共用部装置
２０，２１インターホン
３０，３１分岐器
６０，６１住戸ドアホン子器
３０１，３１１開閉路
３０２，３０３，３１２，３１３制御信号多重分離部
３０４，３０５，３１４，３１５端子
３０６，３１６開閉路電源分離部
Ａ共用伝送線路
Ｂ住戸別伝送線路[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a television intercom device for an apartment house or the like.
[0002]
[Prior art]
FIG. 4 shows a configuration of a television intercom apparatus for a general apartment building as an example of a conventional television intercom apparatus. A TV intercom system for general apartment buildings can talk to visitors at a common entrance in each dwelling unit, and captures images of visitors with a camera-equipped lobby intercom so that they can be monitored on a monitor in each dwelling unit. Visitors can be confirmed. In FIG. 4, the common unit device 10 is provided as the lobby intercom, and the intercom 20 is installed in each dwelling unit. The trunk line from the common unit device 10 is distributed to a plurality of trunk lines (systems) by the distributor 40, and after the distribution. Each trunk line is branched by the branching device 30 to the intercom 20 of each dwelling unit. In addition, a dwelling unit door phone handset 60 is provided at the individual entrance of each dwelling unit, so that visitors at the individual entrance can talk with residents in the dwelling unit.
[0003]
From the common unit 10, a common transmission line D 0 is wired as a main line via a distributor 40, and is distributed to two systems by the distributor 40. The shared transmission line D 0 after the distribution is branched to each dwelling unit by the branching unit 30, and then connected to the intercom 20. The shared transmission line D0 is generally formed of a multi-core twisted pair cable, and the transmission line D1, the transmission line D2, and the transmission line D3 are a pair of cables housed in the same sheath of the shared transmission line D0.
[0004]
From the intercom 20 to the dwelling unit 60, a transmission line B for each dwelling unit composed of a pair of cables is wired. The transmission line B for each dwelling unit is generally wired with a cable having a sheath different from that of the common transmission line D0, but a pair of transmission lines in the common transmission line D0 may be used.
[0005]
Next, the configuration of each unit will be described. First, the common unit 10 includes a CPU 101 that controls an internal circuit of the common unit 10 and controls communication with the intercom 20, and a control signal transmitting / receiving circuit that sends and receives a control signal to the transmission line D1 by the CPU 101. 102, a speaker 103 that outputs an audio signal to talk with a resident in the dwelling unit, a speaker amplifier 104 that amplifies an audio signal to the speaker 103, and a microphone 105 that inputs an audio signal to talk with a resident in the dwelling unit. A microphone amplifier 106 for amplifying an audio signal from the microphone 105, an audio circuit 107 connected to the speaker amplifier 104 and the microphone amplifier 106 and including a two-wire to four-wire conversion circuit for transmitting and receiving an audio signal to the transmission line D2. A camera unit 108 for imaging a visitor at a common entrance and outputting a video signal; FM modulator 109, an amplifier 110 for amplifying the video signal, an unbalanced-balanced conversion of the video signal and sending the video signal to the transmission line D3, a transformer 111, and a 100 V AC converted to the device. A power supply unit 112 for supplying power.
[0006]
The interphone 20 controls the internal circuit of the interphone 20 and performs control for communicating with the common unit device 10, a control signal transmission / reception circuit 202 that sends and receives a control signal to the transmission line D1 by the CPU 201, A speaker 203 that outputs an audio signal for talking with visitors at the common entrance and the individual entrance, a speaker amplifier 204 that amplifies an audio signal to the speaker 203, and a conversation with the visitors at the common entrance and the individual entrance. Therefore, a microphone 205 for inputting an audio signal, a microphone amplifier 206 for amplifying the audio signal from the microphone 205, and a speaker amplifier 204 and a microphone amplifier 206 connected to the microphone amplifier 206 and including a two-wire / four-wire conversion circuit for transmitting the audio signal to the transmission line D2. An audio circuit 207 for transmitting and receiving, and a video signal for receiving from the transmission line D3. A transformer 211 for performing balanced-to-unbalanced conversion, an amplifier 210 for amplifying a video signal, an FM demodulation unit 209 for FM-demodulating the video signal, a display unit 208 for displaying the video signal, and a power supply obtained by converting AC100V into the device. And a switch circuit for connecting the audio circuit 207 and a two-way audio amplifier circuit for communication with the door phone slave unit 60 for transmitting the audio signal to the transmission line B for each unit. And a slave unit interface circuit 213, a slave unit power supply unit 214 for supplying power for operating the dwelling unit doorphone slave unit 60, and a transistor for superposing the power supply of the slave unit power supply unit 214 on the transmission line B for each dwelling unit. And a slave unit power supply superimposing section 215 composed of a circuit.
[0007]
The distributor 40 distributes the transmission line D1 for transmitting the control signal and the transmission line D2 for transmitting the audio signal to two systems without any electric circuit, and the transmission line D3 for transmitting the video signal to the video signal distribution transformer 401. Is distributed to two systems.
[0008]
The branching device 30 branches the transmission line D1 for transmitting the control signal and the transmission line D2 for transmitting the audio signal into two systems without any electric circuit, and converts the transmission line D3 for transmitting the video signal into the video signal branch transformer 301. Branch into two systems. The video signal branching transformer 301 has a trunk-side impedance sufficiently higher than the characteristic impedance of the transmission line D3, and the branch-side impedance matches the characteristic impedance of the transmission line D3.
[0009]
Next, the operation of this conventional example will be described. First, when the control signal including the address of the dwelling unit number of the call destination is transmitted from the control signal transmission / reception circuit 102 of the shared device 10 to the transmission line D1, the control signal is transmitted to the CPU 201 via the control signal transmission / reception circuit 202 of the intercom 20. Upon input, intercom 20 performs an operation according to the control signal. The control signal is branched and distributed by the distributor 40 and the branching unit 30 without passing through any electric circuit. Therefore, the control signal transmitted from the common unit 10 is transmitted to all the interphones connected to the transmission line D1. Only the intercom that is transmitted and corresponds to the dwelling unit number address included in the control signal operates the audio circuit 207 and the display unit 208 according to the control signal, and enters a communication state with the shared unit device 10.
[0010]
In general, voice transmission is performed in the distributor 40 and the branching unit 30 as follows without branching and distributing without using any electric circuit. In the common unit 10, the audio signal transmitted through the transmission line D2 is output from the speaker 103 via the audio circuit 107 and the speaker amplifier 104, and the audio signal input by the microphone 105 is output from the microphone amplifier 106 and the audio circuit. The signal is transmitted to the transmission line D2 via 107. Similarly, in the intercom 20, the audio signal transmitted through the transmission line D2 is output from the speaker 203 via the audio circuit 207 and the speaker amplifier 204, and the audio signal input by the microphone 205 is output from the microphone amplifier 206 and The signal is transmitted to the transmission line D2 via the audio circuit 207. In this way, the visitor and the resident can talk with each other.
[0011]
Next, transmission of a video signal will be described below. The image of the visitor captured by the camera unit 108 in the common unit device 10 is subjected to FM modulation of the video signal by the FM modulation unit 109, and then via the amplifier 110 and the transformer 111 for performing unbalanced-balanced conversion. Output to the transmission line D3. The transmission line D3 can be distributed (branched) to a plurality of trunk lines by the distributor 40. As shown in FIG. 4, the video signal distribution includes a method using a video signal distribution transformer 401 and a method (not shown) for amplifying and distributing using a one-input / multiple-output amplifier circuit. The transmission line from the main line of the transmission line D3 to each dwelling unit is branched by interposing and connecting a branching device 30. The video signal branching transformer 301 is used to branch the video signal.
[0012]
The video signal input to the interphone 20 via the distributor 40 and the splitter 30 is input to the FM demodulation unit 209 via the transformer 211 and the amplifier 210 for balanced-to-unbalanced conversion, and is FM-demodulated. Residents within can check the visitor on the display unit 208.
[0013]
In the above conventional example, the video signal, the audio signal, and the control signal are transmitted through separate transmission lines. However, the transmission line transmits only the video signal, the audio signal, and the DC voltage by frequency multiplexing, and the control signal is transmitted. A television intercom device for a multi-family house having two transmission lines, a transmission line for transmitting only a video signal and a DC voltage by frequency multiplexing, and a transmission line for transmitting a control signal. There was also a television intercom device for apartments provided. (For example, see Patent Documents 1 and 2.)
[0014]
Further, as a conventional technique, in an intercom device of a detached house (that is, communication without using a branching device) instead of an apartment house, a DC power supply for powering a slave unit, an audio signal, a control signal, and a video signal are transmitted through a pair of transmission lines. Some are multiplexed and transmitted. FIG. 5 shows an outline of the transmission frequency band of each signal. The DC power supply is DC, the audio signal is 1 KHz band, the control signal is 100 KHz band by FSK (Frequency Shift Keying), and the video signal is 1 MHz band by FM modulation. Are distributed.
[0015]
[Patent Document 1]
Japanese Patent No. 311536 (page 6, right column, lines 24 to 29, page 7, left column, lines 23 to 38, FIG. 12)
[Patent Document 2]
JP-A-2002-94974 (page 2, right column, line 15 to line 21, page 3, right column, line 1 to right column, line 16, FIG. 1 (a), (b), FIG. 3)
[0016]
[Problems to be solved by the invention]
In a conventional TV intercom system for apartment buildings, since the audio signal, control signal, and video signal are transmitted on separate lines, the logarithm of the cable increases, which makes it difficult to handle the cable, such as it is difficult to bend and the cable cost is also low. Was higher.
[0017]
Furthermore, since the number of terminals in each device increases, there is a problem that it is difficult to understand the connection method, and a construction error easily occurs.
[0018]
The present invention has been made in view of the above circumstances, and an object of the present invention is to reduce the number of wiring pairs to realize wiring saving and construction saving, so that audio signals, control signals, and video signals are placed on the same line. It is an object of the present invention to provide a multi-unit television intercom apparatus that can be multiplexed and transmitted.
[0019]
[Means for Solving the Problems]
The invention according to claim 1 is a camera for imaging a visitor at a common entrance of an apartment house and outputting a video signal, and inputting / outputting an audio signal for the visitor of the common entrance to talk with a resident in a dwelling unit of the apartment house. Unit and a first control signal transmitting / receiving means for receiving a control signal from an external device while outputting a control signal including an address of a dwelling unit and a video signal from a camera of the common unit A monitor for a resident in the dwelling unit to see a visitor at the common entrance, a speaker and a microphone for inputting and outputting a voice signal for the resident in the dwelling unit to talk with the visitor, between the common unit device The communication device further includes a second control signal transmission / reception unit for transmitting and receiving a control signal, and operates based on the received control signal if its own address corresponds to an address included in the control signal from the common unit. And a pair of shared transmission lines for transmitting video signals, audio signals, and control signals, and a trunk line of the shared transmission line wired from the shared unit device. And a branching device for branching a shared transmission line from the intercom to the intercom, and a unit doorphone handset for exchanging audio signals between the interphone and allowing a visitor at an individual entrance of the unit to talk with a resident in the unit. The dwelling unit doorphone handset and the interphone are connected via the branching unit, and are configured with a dwelling unit-specific transmission line through which an audio signal is transmitted, and the common unit device is a video signal, an audio signal, and A first signal demultiplexing unit that frequency-multiplexes and transmits a control signal to the shared transmission line and separates a frequency-multiplexed signal received from the shared transmission line into a voice signal and a control signal; In addition, the intercom apparatus transmits a frequency multiplexed audio signal and a control signal to the shared transmission line and transmits the signal, and separates the frequency multiplexed signal received from the shared transmission line into a video signal, an audio signal, and a control signal. And a slave unit power supply superimposing means for superimposing power supplied to the dwelling unit on the transmission line for each dwelling unit, wherein the splitter is a common unit of the shared transmission line. A switch that switches the connection destination of the side trunk line to one of the transmission side trunk line of the shared transmission line and the intercom side branch line of the shared transmission line, and is connected between the common unit side trunk line and the transmission side trunk line. A first control band pass means for passing only control signals through the control unit, and a second control band pass means connected between the common unit side trunk and the intercom branch line for passing only control signals. To the dwelling unit doorphone handset from a signal of the short circuit, a short circuit between the first and second terminals connecting the transmission line for each dwelling unit, the first and second terminals, and a signal of the short circuit. Power supply separating means for separating the supply power of the power supply, and if the power supply separated by the power supply separating means is a predetermined voltage or less, the connection destination by the switch is maintained on the sending main line; And a switch switching means for switching a connection destination of the switch to a branch line on the interphone side.
[0020]
According to a second aspect of the present invention, in the first aspect, the power supply to the dwelling unit doorphone handset superimposed by the cordless unit power supply superimposing means of the interphone is a first voltage for operating the dwelling unit doorphone handset; And a second voltage higher than the first voltage for driving the switch. The switch switching means of the branching switch outputs the first power from the power supply separated by the power separation means. If the voltage, the connection destination by the switch is maintained on the sending main line of the shared transmission line, and if the voltage is the second voltage, the connection by the switch is switched to the interphone-side branch line of the shared transmission line. Features.
[0021]
The invention according to claim 3 is a camera for imaging a visitor at a common entrance of an apartment complex and outputting a video signal, and inputting and outputting an audio signal for the visitor of the common entrance to talk with a resident in a dwelling unit of the apartment complex. A first control signal transmitting / receiving means for receiving a control signal from the outside while outputting a control signal including an address of a called dwelling unit, a shared unit device including a DC power supply, and a camera of the shared unit device. A monitor for a resident in a dwelling to see a visitor at a common entrance, a speaker and a microphone for inputting / outputting an audio signal for a resident in a dwelling unit to talk to a visitor, and the common unit device And a second control signal transmitting / receiving means for transmitting and receiving a control signal between the control unit and the control unit. If the own address corresponds to an address included in the control signal from the common unit, the control unit operates based on the received control signal. Interphone, a pair of shared transmission lines for connecting the common unit device and the interphone, and transmitting a video signal, an audio signal, a control signal, and a DC power supply, and a common line wired from the common unit device. A branching unit for branching a shared transmission line from the trunk line of the transmission line to the interphone, and a unit for transmitting and receiving a voice signal between the interphone and allowing a visitor at an individual entrance of the unit to talk with a resident in the unit A doorphone slave unit, which connects between the dwelling unit doorphone slave unit and the intercom, is configured by a transmission line for each dwelling unit in which an audio signal is transmitted, and the shared unit device is a video signal, an audio signal, a control signal, And a first signal multiplexer for frequency-multiplexing and transmitting a DC power supply to the shared transmission line and separating a frequency-multiplexed signal received from the shared transmission line into a voice signal and a control signal. Separation means, the intercom apparatus, the audio signal and the control signal are frequency-multiplexed and transmitted to the shared transmission line, and the frequency-multiplexed signal received from the shared transmission line is a video signal, an audio signal, a control signal, and A second signal demultiplexing unit for separating into a DC power supply, and a load that consumes a current supplied from the DC power supply of the shared unit device if its own address corresponds to an address included in a control signal from the shared unit device. A pair of diodes respectively connected in a forward direction with respect to a transmission direction of each signal of the pair of shared transmission lines between the trunk line and the branch line of the shared transmission line; and Control band-pass means connected between the main line and the branch line of the line to pass only control signals, wherein the pair of diodes is supplied from a DC power supply of the common unit device. It is characterized in that it is made conductive by a given current.
[0022]
According to a fourth aspect of the present invention, in the third aspect, the branch unit is connected between a trunk line and a branch line of the shared transmission line in a forward direction with respect to a transmission direction of each signal of the pair of shared transmission lines. A pair of first diodes, first control band-pass means connected between the trunk line and the branch line of the shared transmission line for passing only control signals, and a pair of shared transmission lines connected to the trunk line after the branch. A pair of second diodes respectively connected in a forward direction with respect to a transmission direction of each signal, and a second control band pass means connected to the branched main line and passing only a control signal, The first and second diodes are electrically connected by a current supplied from a DC power supply of the common unit.
[0023]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0024]
(Embodiment 1)
In the present embodiment shown in FIG. 1, the basic configuration of the television intercom apparatus for a condominium is substantially the same as the configuration of the conventional television intercom apparatus for a condominium shown in FIG. 4, and the same configuration as in FIG. The same reference numerals are given and the description is omitted.
[0025]
In the present embodiment, the common unit 10, the branching devices 30 and 31, and the interphones 20 and 21 are connected by a pair of shared transmission lines A, and the interphone 20 branches from the trunk line of the shared transmission line A at the branching device 30. The interphone 21 is branched from the trunk line of the shared transmission line A by the branch unit 31 and connected. Each of the interphones 20 and 21 and each of the dwelling unit doorphone handsets 60 and 61 are connected by a dwelling unit-specific transmission line B via branching devices 30 and 31, respectively.
[0026]
The control signal transmitting / receiving circuit 102 for transmitting / receiving a control signal, the audio circuit 107 for transmitting / receiving an audio signal, and the transformer 111 for transmitting a video signal in the common unit 10 are a control signal demultiplexing unit 115 and an audio signal demultiplexing unit, respectively. 113 and the shared transmission line A via the video signal multiplexing unit 114.
[0027]
The audio signal multiplexing / demultiplexing unit 113, the video signal multiplexing unit 114, and the control signal multiplexing / demultiplexing unit 115 in the common unit 10 are for multiplexing / demultiplexing each transmission signal for each transmission frequency band. The frequency band is a video signal, a control signal, and an audio signal in descending order. The audio signal multiplexing / demultiplexing unit 113 is mainly composed of an inductor or the like, and serves to increase the impedance of each transmission band of the video signal and the control signal higher than the audio signal. The video signal multiplexing section 114 is mainly composed of a capacitor or the like, and serves to increase the impedance of each transmission band of the control signal and the audio signal lower than the video signal. The control signal demultiplexing unit 115 is mainly configured by a band-pass filter in which an inductor, a capacitor, and the like are combined, and increases the impedance of each transmission band between an audio signal lower than the control signal and a video signal higher than the control signal. It is for doing.
[0028]
Also, a control signal transmitting / receiving circuit 202 for transmitting / receiving a control signal within the intercom 20, an audio circuit 207 for transmitting / receiving an audio signal, and a transformer 211 for receiving a video signal are respectively a control signal demultiplexing unit 218, an audio signal demultiplexing unit 216, And via the video signal separation unit 217 to the shared transmission line A.
[0029]
The audio signal demultiplexing unit 216, video signal demultiplexing unit 217, and control signal demultiplexing unit 218 in the interphone 20 are for multiplexing / demultiplexing each transmission signal for each transmission frequency band. The audio signal multiplexing / demultiplexing unit 216 is mainly configured by an inductor or the like, and serves to increase the impedance of each transmission band of the video signal and the control signal higher than the audio signal. The video signal separation unit 217 is mainly configured by a capacitor or the like, and is for increasing the impedance of each transmission band of the control signal and the audio signal lower than the video signal. Further, the control signal demultiplexing unit 218 is mainly configured by a band-pass filter in which an inductor, a capacitor, and the like are combined, and increases the impedance of each transmission band between an audio signal lower than the control signal and a video signal higher than the control signal. It is for doing.
[0030]
The intercom 21 is also configured in the same manner as the intercom 20, and includes a slave unit power supply unit 224 for supplying power for operating the dwelling unit doorphone slave unit 61 and a unit for superimposing the power of the slave unit power supply unit 224 on the transmission line B for each dwelling unit. And a slave unit power supply superimposing section 225 composed of a transistor circuit.
[0031]
The switches 30 and 31 are switches 301 and 311 for switching the connection destination of the common line device side main line of the shared transmission line A to either the transmission side main line of the shared transmission line A or the interphone side branch line, and the shared transmission line. Control signal multiplexing / demultiplexing units 302 and 312, which are connected between the trunk line on the common side of the line A and the trunk line on the sending side and pass only control signals, and the common unit on the common line A Terminals for connecting control signal multiplexing / demultiplexing units 303 and 313, which are connected between the main trunk line and the intercom branch line, and formed of band-pass filters that pass only control signals, and the transmission line B for each dwelling unit from the intercom 20. 304 and 314, terminals 305 and 315 for connecting the transmission line B for each dwelling unit from the dwelling unit doorphone devices 60 and 61, and between the terminals 304 and 305 and the terminal 314-3. The power supply superimposed by the power supply superimposition units 215 and 225 of the interphones 20 and 21 is separated from the signals of the short circuits 309 and 319 by increasing the impedance of the audio signal transmission band by increasing the impedance of the audio signal transmission band. Switch power supply separation units 306 and 316 for switching the connection by the switches 301 and 311 to the interphone-side branch line of the shared transmission line A by the separated power supply.
[0032]
Regardless of which of the paths by the switches 301 and 311 is switched, the control signal can pass through the control signal demultiplexing units 303 and 313, and the control signal sent from the common unit 10 is shared. The signal is transmitted to all the interphones 20 and 21 connected to the transmission line A.
[0033]
Hereinafter, a series of operations of the present embodiment will be described. When a visitor presses a call button (not shown) of the common unit 10, the common unit 10 sends a control signal including a dwelling unit number address of the corresponding dwelling unit via the control signal transmitting / receiving circuit 102 and the control signal demultiplexing unit 115 from the CPU 101. To the shared transmission line A, and sends the video signal imaged by the camera unit 108 and FM-modulated by the FM modulation unit 109 via the amplifier 110, the transformer 111, and the video signal multiplexing unit 114. , The microphone amplifier 106, the audio circuit 107, and the like.
[0034]
Then, the audio signal, the video signal, and the control signal are frequency-multiplexed and transmitted to the shared transmission line A by the audio signal multiplexing / demultiplexing unit 113, the video signal multiplexing unit 114, and the control signal multiplexing / demultiplexing unit 115. At this time, the connection destination of the common line device side trunk line of the shared transmission line A by the switches 301 and 311 of the branching devices 30 and 31 is the transmission side trunk line of the shared transmission line A, and only the control signal is a control signal multiplex. After passing through the band-pass filters of the separation units 303 and 313, the signals are multiplexed again on the branch line of the shared transmission line A branched from the trunk of the shared transmission line A, and reach the interphones 20 and 21.
[0035]
The control signal is transmitted through the control signal demultiplexing units 303 and 313 of the splitters 30 and 31 connected to the shared transmission line A, and the control signal demultiplexing unit 218 and the control signal transmitting / receiving circuit 202 in the interphones 20 and 21 are transmitted. Via the CPU 201. Then, when the own unit is the corresponding dwelling unit called, the intercom 20 operates the speaker amplifier 204, the microphone amplifier 206, and the audio circuit 207 according to the control signal, and switches the slave unit power supply unit 214 to the slave unit power supply superimposing unit 215. The power supply to the dwelling unit doorphone handset 60 is superimposed on the dwelling unit transmission line B via.
[0036]
In the branching device 30 that relays the transmission line B for each dwelling unit, the power is separated from the signal transmitted through the short circuit 309 by the switching power supply separation unit 306, and the switching path 301 is switched using this power to switch the shared transmission line A. The connection destination of the common unit side trunk is the intercom branch line. Since the interphone 21 that is not called does not supply power to the dwelling unit 61, the open / close path 311 of the branching unit 31 maintains the connection to the main trunk on the sending side.
[0037]
Therefore, the video signal and the audio signal frequency-multiplexed by the common unit 10 are transmitted only to the interphone 20 via the switching path 301 of the branching device 30. The interphone 20 transmits and receives an audio signal via the audio signal multiplexing / demultiplexing unit 216, enters a communication state with the common unit 10, activates the display unit 208, and transmits the video signal received via the video signal separating unit 217. Is demodulated by the FM demodulation unit 209 and displayed on the display unit 208. This allows the resident to talk to the visitor and monitor the visitor.
[0038]
As described above, according to the present embodiment, even when the splitter 30 is connected to the shared transmission line A between the shared unit device 10 and the interphone 20, the video signal, the audio signal, and the control signal are not changed. It becomes possible to transmit by the pair of shared transmission lines A.
[0039]
Further, the branching from the main line of the shared transmission line A to the branch line from the trunk line to the interphones 20 and 21 is realized by switching by the open / close paths 301 and 311 of the branching units 30 and 31, so that the video signal and the audio signal are frequency-multiplexed. It can be passed through the branching devices 30, 31.
[0040]
The drive power for the switching paths 301 and 311 is superimposed on the transmission lines B and B for each dwelling unit, which are wired in parallel with the transmission lines A and A extending from the branching devices 30 and 31 to the interphones 20 and 21. Therefore, there is no need to connect a power supply separation unit for driving the switching paths 301 and 311 to the shared transmission line A, and the impedance of the audio signal transmission band and the video signal transmission band of the shared transmission line A does not decrease.
[0041]
In addition, in FIG. 1 of the present embodiment, two splitters and two intercoms are shown, but more splitters and intercoms may be similarly provided.
[0042]
(Embodiment 2)
In the present embodiment, among the constituent elements shown in FIG. 1, the slave unit power supply units 214 and 224 in the intercoms 20 and 21 can operate the dwelling unit door phone slave units 60 and 61 as shown in FIG. The first voltage level V1 and the second voltage level V2 capable of driving the switching paths 301 and 311 in the branching devices 30 and 31 can be switched and output.
[0043]
The second voltage level V2 is set to a level higher than the first voltage level V1, and the switching power supply separation units 306 and 316 in the branching units 30 and 31 identify the two voltage levels described above, The switching paths 301 and 311 are switched to the branch side only when the second voltage level is detected, and when the first voltage level is detected and when power is not supplied to the dwelling unit 60 and 61. The open / close paths 301 and 311 are maintained in a state where they are connected to the feed main line. Therefore, for example, when the common unit 10 and the interphone 20 are in a talking state, the dwelling unit 61 of the intercom 21 connected to the common transmission line A from the common unit 10 to the interphone 20 operates, The switching circuit 311 of the branching unit 31 to which the intercom 21 is connected is switched to the branch side, and the problem that the communication between the common unit 10 and the intercom 20 is disconnected is eliminated.
[0044]
(Embodiment 3)
In the present embodiment shown in FIG. 3, a switch 219 and capacitors 220 and 221 are added to the interphone 20 shown in FIG. And the connection point between the shared transmission line A and the capacitor 220 is connected to the audio circuit 207 through a series circuit of a switch 219, an audio signal multiplexing / demultiplexing unit 216, and a capacitor 221. The connection point with the unit 216 is connected to the video signal separation unit 217. By opening the switch 219, transmission of the audio signal and the video signal to the audio signal demultiplexing unit 216 and the video signal separating unit 217 is cut off. The intercom 21 also includes a switch 229 in the same manner.
[0045]
The common unit apparatus 10 further includes a power supply superposition unit 116 and capacitors 117 and 118 in the configuration shown in FIG. 1, and the power supply superposition unit 116 supplies power from the power supply unit 112 to the interphones 20 and 21. Capacitors 118 and 117 are provided as a DC power supply for superimposing on the audio signal, the video signal, and the control signal of the shared transmission line A. To block the DC power supply. The video signal multiplexing unit 114 also blocks input of DC power to the transformer 111.
[0046]
Further, the intercom 20 is provided with a load circuit 222 between the connection point of the switch 219 and the video signal separation unit 217 and the circuit ground, and the intercom 21 is also provided with a load circuit 232. Is for consuming the DC current supplied from the common unit 10. Capacitors 221 and 220 are provided for the audio circuit 207 and the control signal demultiplexing unit 218 that do not require a DC power supply, thereby blocking the DC power supply. Note that the video signal separation unit 217 also blocks DC power input to the transformer 211.
[0047]
The branching devices 30 and 31 include a pair of diode pairs connected in a forward direction with respect to a transmission direction of each signal of a pair of electric wires between the trunk line of the shared transmission line A and the branch line, and a pair of diode pairs in the trunk line after branching. A pair of diode sets 308 and 318 connected in the forward direction with respect to the transmission direction of each signal of the electric wire of the above, and a band pass connected between the trunk line and the branch line of the shared transmission line A and passing only the control signal A control signal multiplexing / demultiplexing unit composed of a filter, and control signal multiplexing / demultiplexing units 307 and 317 each including a band-pass filter connected to the trunk after branching and allowing only the control signal to pass therethrough. The pair of diode sets 308 and 318 are constituted by PIN diodes.
[0048]
The control signal can pass through the control signal demultiplexing units 307 and 317, and the control signal transmitted from the common unit 10 is transmitted to all interphones connected to the transmission line A.
[0049]
Hereinafter, a series of operations of the present embodiment will be described. When a visitor presses a call button (not shown) in the common unit 10, a control signal including a dwelling unit number address is connected to the common transmission line A via the control signal demultiplexing units 317 and 307 from the common unit 10. The opening / closing path 219 is closed by the CPU 212 that has received the control signal only in the intercom 20 transmitted to all the intercoms 20 and 21 corresponding to the dwelling unit number address. When the switching circuit 219 is closed, the load circuit 222 is connected to the transmission line A, the diode set 308 connected between the trunk line of the shared transmission line A of the branch unit 30 and the branch line, and the trunk line of the branch unit 31 after branching. A current flows in the forward direction through the diode group 318 connected to the power supply unit, and the DC current superimposed by the power supply superimposing unit 116 of the shared unit device 10 is consumed by the load circuit 222.
[0050]
Then, the diode group 308 connected between the trunk line and the branch line of the shared transmission line A and the diode group 318 connected to the branched trunk line become conductive (on state) due to the flow of forward current, and are transmitted. The branch line leading to the interphone 20 is connected to the main line of the line A.
[0051]
Since the open / close path 229 of the interphone 21 that has not been called is not closed, the diode set 318 connected between the trunk line and the branch line of the shared transmission line A of the branching device 31 remains in the off state, and the branching to the interphone 21 is continued. The line is not connected to the trunk of transmission line A.
[0052]
Therefore, the video signal and the audio signal frequency-multiplexed by the common unit 10 are supplied to the diode group 318 connected to the trunk of the branch unit 31 after branching, and between the trunk line and the branch line of the shared transmission line A of the branch unit 30. The signal is transmitted only to the interphone 20 via the connected diode set 308, and can be passed through the branching device while the video signal and the audio signal are frequency-multiplexed.
[0053]
【The invention's effect】
The invention according to claim 1 is a camera for imaging a visitor at a common entrance of an apartment house and outputting a video signal, and inputting / outputting an audio signal for the visitor of the common entrance to talk with a resident in a dwelling unit of the apartment house. Unit and a first control signal transmitting / receiving means for receiving a control signal from an external device while outputting a control signal including an address of a dwelling unit and a video signal from a camera of the common unit A monitor for a resident in the dwelling unit to see a visitor at the common entrance, a speaker and a microphone for inputting and outputting a voice signal for the resident in the dwelling unit to talk with the visitor, between the common unit device The communication device further includes a second control signal transmission / reception unit for transmitting and receiving a control signal, and operates based on the received control signal if its own address corresponds to an address included in the control signal from the common unit. And a pair of shared transmission lines for transmitting video signals, audio signals, and control signals, and a trunk line of the shared transmission line wired from the shared unit device. And a branching device for branching a shared transmission line from the interphone to the interphone, and a doorphone handset for transmitting and receiving an audio signal between the interphone and allowing a visitor at an individual front door of the dwelling unit to talk with a resident in the dwelling unit. The dwelling unit doorphone handset and the interphone are connected via the branching unit, and are configured with a dwelling unit-specific transmission line through which an audio signal is transmitted, and the common unit device is a video signal, an audio signal, and A first signal demultiplexing unit that frequency-multiplexes and transmits a control signal to the shared transmission line and separates a frequency-multiplexed signal received from the shared transmission line into a voice signal and a control signal; The intercom apparatus transmits the frequency-multiplexed audio signal and the control signal to the shared transmission line, and transmits the frequency-multiplexed signal received from the shared transmission line into a video signal, an audio signal, and a control signal. And a slave unit power supply superimposing means for superimposing power supplied to the dwelling unit on the transmission line for each dwelling unit, wherein the branching device is a common unit of the shared transmission line. A switch that switches the connection destination of the side trunk line to one of the transmission side trunk line of the shared transmission line and the intercom side branch line of the shared transmission line, and is connected between the common unit side trunk line and the transmission side trunk line. A first control band pass means for passing only control signals through the control unit, and a second control band pass means connected between the common unit side trunk and the intercom branch line for passing only control signals. To the dwelling unit doorphone handset from a signal of the short circuit, a short circuit between the first and second terminals connecting the transmission line for each dwelling unit, the first and second terminals, and a signal of the short circuit. Power supply separating means for separating the supply power of the power supply, and if the power supply separated by the power supply separating means is equal to or less than a predetermined voltage, the connection destination of the switch is maintained on the sending main line; Since there is provided a switch switching means for switching a connection destination of the switch to the interphone-side branch line, a switch is interposed and connected to a shared transmission line between the common unit and the interphone as in a TV intercom device for apartment housing. In this case, the video signal, the control signal, and the audio signal are frequency-multiplexed, and can be transmitted through a pair of shared transmission lines. There is an effect that it is possible to realize a Senka-saving and construction of. In addition, the video signal and the audio signal can be passed through the branching device while being frequency-multiplexed, and the power supply separation unit for driving the switching path is not required in the transmission line of the video / audio multiplex signal. The impedance of the shared transmission line does not decrease due to the connection of the sections.
[0054]
According to a second aspect of the present invention, in the first aspect, the power supply to the dwelling unit doorphone handset superimposed by the cordless unit power supply superimposing means of the interphone is a first voltage for operating the dwelling unit doorphone handset; And a second voltage higher than the first voltage for driving the switch. The switch switching means of the branching switch outputs the first power from the power supply separated by the power separation means. If the voltage, the connection destination by the switch is maintained on the sending main line of the shared transmission line, and if the second voltage, the connection by the switch is switched to the interphone-side branch line of the shared transmission line, There is an effect that the opening / closing path is not unnecessarily switched during the operation of the dwelling unit doorphone.
[0055]
The invention according to claim 3 is a camera for imaging a visitor at a common entrance of an apartment complex and outputting a video signal, and inputting and outputting an audio signal for the visitor of the common entrance to talk with a resident in a dwelling unit of the apartment complex. A first control signal transmitting / receiving means for receiving a control signal from the outside while outputting a control signal including an address of a called dwelling unit, a shared unit device including a DC power supply, and a camera of the shared unit device. A monitor for a resident in a dwelling to see a visitor at a common entrance, a speaker and a microphone for inputting / outputting an audio signal for a resident in a dwelling unit to talk to a visitor, and the common unit device And a second control signal transmitting / receiving means for transmitting and receiving a control signal between the control unit and the control unit. If the own address corresponds to an address included in the control signal from the common unit, the control unit operates based on the received control signal. Interphone, a pair of shared transmission lines for connecting the common unit device and the interphone, and transmitting a video signal, an audio signal, a control signal, and a DC power supply, and a common line wired from the common unit device. A branching unit for branching a shared transmission line from the trunk line of the transmission line to the interphone, and a unit for transmitting and receiving a voice signal between the interphone and allowing a visitor at an individual entrance of the unit to talk with a resident in the unit A doorphone slave unit, which connects between the dwelling unit doorphone slave unit and the intercom, is configured by a transmission line for each dwelling unit in which an audio signal is transmitted, and the shared unit device is a video signal, an audio signal, a control signal, And a first signal multiplexer for frequency-multiplexing and transmitting a DC power supply to the shared transmission line and separating a frequency-multiplexed signal received from the shared transmission line into a voice signal and a control signal. Separation means, the intercom apparatus, the audio signal and the control signal are frequency-multiplexed and transmitted to the shared transmission line, and the frequency-multiplexed signal received from the shared transmission line is a video signal, an audio signal, a control signal, and A second signal demultiplexing unit for separating into a DC power supply, and a load that consumes a current supplied from the DC power supply of the shared unit device if its own address corresponds to an address included in a control signal from the shared unit device. A pair of diodes respectively connected in a forward direction with respect to a transmission direction of each signal of the pair of shared transmission lines between the trunk line and the branch line of the shared transmission line; and Control band-pass means connected between the main line and the branch line of the line to pass only control signals, wherein the pair of diodes is supplied from a DC power supply of the common unit device. The video signal, the control signal, and the audio signal are transmitted even when a splitter is interposed and connected to the common transmission line between the common unit and the interphone, such as a TV intercom device for a multi-family house, because the current is conducted. The transmission can be multiplexed and transmitted by a pair of shared transmission lines, wiring can be performed with a small number of cables, and there is an effect that wiring and construction can be reduced. Furthermore, since the video signal and the audio signal can be passed through the branching device while being frequency-multiplexed, and the switching line is not used for the transmission line of the video / audio multiplexed signal, a power supply separation unit for driving the switching path is used. Is unnecessary, and the impedance of the transmission line does not decrease due to the connection of the power supply separation unit.
[0056]
According to a fourth aspect of the present invention, in the third aspect, the branch unit is connected between a trunk line and a branch line of the shared transmission line in a forward direction with respect to a transmission direction of each signal of the pair of shared transmission lines. A pair of first diodes, first control band-pass means connected between the trunk line and the branch line of the shared transmission line for passing only control signals, and a pair of shared transmission lines connected to the trunk line after the branch. A pair of second diodes respectively connected in a forward direction with respect to a transmission direction of each signal, and a second control band pass means connected to the branched main line and passing only a control signal, Since the first and second diodes are turned on by the current supplied from the DC power supply of the common unit, there is an effect that transmission of unnecessary video / audio multiplex signals to a stage subsequent to the branch unit can be prevented.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of a first embodiment of the present invention.
FIG. 2 is a diagram illustrating a part of a configuration according to a second embodiment of the present invention.
FIG. 3 is a diagram showing a configuration of a third embodiment of the present invention.
FIG. 4 is a diagram showing a configuration of a conventional example.
FIG. 5 is a diagram showing a transmission frequency band of the above signal.
[Explanation of symbols]
10 Common unit equipment
20, 21 intercom
30,31 turnout
60,61 dwelling unit door phone cord
301,311 switching path
302, 303, 312, 313 Control signal demultiplexing section
304, 305, 314, 315 terminals
306,316 Switch circuit power supply separation unit
A Shared transmission line
B. Transmission line by dwelling unit

Claims

A camera that images the visitors at the common entrance of the apartment complex and outputs a video signal, speakers and microphones that input and output audio signals for the visitors at the common entrance to talk with residents in the apartment house, and the call destination A common unit including a first control signal transmitting / receiving means for outputting a control signal including an address of a dwelling unit and receiving a control signal from the outside;
A monitor for inputting a video signal from the camera of the common unit to see a visitor at a common entrance of a dwelling in the dwelling unit, a speaker for input / output of an audio signal for a dwelling in the dwelling unit to talk to the visitor, and A second control signal transmitting / receiving means for transmitting and receiving a control signal between the microphone and the common unit; and a control signal received if the own address corresponds to an address included in the control signal from the common unit. An intercom that operates based on
Connecting between the common unit and the intercom, a video signal, an audio signal, and a pair of shared transmission lines through which a control signal is transmitted,
A branching device that branches the shared transmission line from the trunk line of the shared transmission line wired from the shared unit device to the interphone,
A unit doorphone handset for transmitting and receiving a voice signal between the intercom and a visitor at an individual entrance of the unit to talk with a resident in the unit,
The dwelling unit doorphone slave unit and the interphone are connected via the branching unit, and are configured by a transmission line for each dwelling unit through which an audio signal is transmitted,
The sharing unit apparatus frequency-multiplexes and transmits a video signal, an audio signal, and a control signal to the shared transmission line, and separates the frequency multiplexed signal received from the shared transmission line into an audio signal and a control signal. Signal demultiplexing means,
The intercom apparatus transmits a frequency-multiplexed audio signal and a control signal to the shared transmission line and transmits the signal, and separates a frequency-multiplexed signal received from the shared transmission line into a video signal, an audio signal, and a control signal. Signal demultiplexing means, and a slave unit power supply superimposing means for superimposing power to be supplied to the dwelling unit doorphone handset on the transmission line for each dwelling unit,
A switch for switching a connection destination of a common unit device-side main line of the shared transmission line to one of a transmission main line of the shared transmission line and an interphone-side branch line of the shared transmission line; and First control band-pass means connected between the device-side main line and the sending-side main line to pass only control signals; and only control signals connected between the common-unit-side main line and the intercom-side branch line. A second control band pass means for passing the transmission line, first and second terminals for connecting the transmission line for each dwelling unit, a short circuit between the first and second terminals, and a short circuit between the first and second terminals. A power supply separating means for separating a power supply to the door phone slave unit from the signal, and a power supply separated by the power supply separating means, if the power supply is equal to or lower than a predetermined voltage, the connection destination of the switch is maintained on a sending main line; If above, separate power supply Therefore collective housing television interphone device characterized by comprising a switch switching means for switching the connection destination of the switch on the intercom side branch line.

A power supply to the dwelling unit doorphone handset superimposed by the handset power supply superimposing means of the interphone is a first voltage for operating the dwelling unit doorphone handset and the first voltage for driving the switch. A second voltage higher than the voltage, and the switch switching means of the branching device switches the connection destination by the switch if the power supply separated by the power supply separating means is the first voltage. 2. The television for an apartment complex according to claim 1, wherein the connection by the switch is switched to a branch line on the intercom side of the shared transmission line if the second voltage is maintained at the sending main line of the shared transmission line. Intercom equipment.

A camera that images the visitors at the common entrance of the apartment complex and outputs a video signal, speakers and microphones that input and output audio signals for the visitors at the common entrance to talk with residents in the apartment house, and the call destination A first control signal transmitting / receiving unit that outputs a control signal including an address of a dwelling unit and receives an external control signal, a common unit including a DC power supply,
A monitor for inputting a video signal from the camera of the common unit to see a visitor at a common entrance of a dwelling in the dwelling unit, a speaker for input / output of an audio signal for a dwelling in the dwelling unit to talk to the visitor, and A second control signal transmitting / receiving means for transmitting and receiving a control signal between the microphone and the common unit; and a control signal received if the own address corresponds to an address included in the control signal from the common unit. An intercom that operates based on
Connecting between the common unit and the interphone, a video signal, an audio signal, a control signal, and a pair of shared transmission lines through which DC power is transmitted,
A branching device that branches the shared transmission line from the trunk line of the shared transmission line wired from the shared unit device to the interphone,
A unit doorphone handset for transmitting and receiving a voice signal between the intercom and a visitor at an individual entrance of the unit to talk with a resident in the unit,
It connects between the dwelling unit doorphone handset and the intercom, and is configured by a dwelling unit-specific transmission line through which an audio signal is transmitted,
The common unit device frequency-multiplexes and transmits a video signal, an audio signal, a control signal, and a DC power supply to the common transmission line, and separates a frequency-multiplexed signal received from the common transmission line into an audio signal and a control signal. A first signal demultiplexing means,
The intercom apparatus frequency-multiplexes and transmits an audio signal and a control signal to the shared transmission line, and separates the frequency-multiplexed signal received from the shared transmission line into a video signal, an audio signal, a control signal, and a DC power supply. A second signal demultiplexing unit, and a load that consumes a current supplied from a DC power supply of the common unit if the own address corresponds to an address included in the control signal from the common unit.
The splitter includes a pair of diodes connected in a forward direction with respect to a transmission direction of each signal of the pair of shared transmission lines between a trunk line and a branch line of the shared transmission line, and a trunk line of the shared transmission line. A control band-passing means connected between the branch line and the control line for passing only a control signal, wherein the pair of diodes conducts by a current supplied from a DC power supply of the common unit. Residential TV intercom equipment.

A pair of first diodes respectively connected in a forward direction with respect to a transmission direction of each signal of the pair of shared transmission lines between a trunk line and a branch line of the shared transmission line; A first control band-pass means connected between the trunk line and the branch line for passing only control signals, and a forward direction with respect to the transmission direction of each signal of the pair of shared transmission lines on the trunk line after the branch. A pair of connected second diodes, and a second control band-pass unit connected to the branched main line and passing only a control signal, wherein the pair of first and second diodes are connected to the common unit. The television intercom device for a multi-family house according to claim 3, wherein conduction is provided by a current supplied from a DC power supply of the device.