JPH0329583A - 2-wire tv interphone system - Google Patents
2-wire tv interphone systemInfo
- Publication number
- JPH0329583A JPH0329583A JP16439189A JP16439189A JPH0329583A JP H0329583 A JPH0329583 A JP H0329583A JP 16439189 A JP16439189 A JP 16439189A JP 16439189 A JP16439189 A JP 16439189A JP H0329583 A JPH0329583 A JP H0329583A
- Authority
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- Prior art keywords
- base unit
- unit
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- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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- 230000005540 biological transmission Effects 0.000 claims abstract description 31
- 238000001514 detection method Methods 0.000 claims abstract description 25
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 17
- 238000010586 diagram Methods 0.000 description 11
- 238000000926 separation method Methods 0.000 description 6
- 230000005236 sound signal Effects 0.000 description 6
- 230000003321 amplification Effects 0.000 description 4
- 238000003199 nucleic acid amplification method Methods 0.000 description 4
- AZUYLZMQTIKGSC-UHFFFAOYSA-N 1-[6-[4-(5-chloro-6-methyl-1H-indazol-4-yl)-5-methyl-3-(1-methylindazol-5-yl)pyrazol-1-yl]-2-azaspiro[3.3]heptan-2-yl]prop-2-en-1-one Chemical compound ClC=1C(=C2C=NNC2=CC=1C)C=1C(=NN(C=1C)C1CC2(CN(C2)C(C=C)=O)C1)C=1C=C2C=NN(C2=CC=1)C AZUYLZMQTIKGSC-UHFFFAOYSA-N 0.000 description 2
- 239000000284 extract Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
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- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Closed-Circuit Television Systems (AREA)
- Interconnected Communication Systems, Intercoms, And Interphones (AREA)
Abstract
Description
【発明の詳細な説明】
し産業上の利用分野］
本発明は多局化を図った２線式テレビインターホンシス
テムに関するものである．
［従来の技術］
来客の姿を室内側で視認できるようにするため、モニタ
用テレビカメラを玄関先に設置した子機側に設け、室内
に設置した親機側にはモニタテレビを設けて通話と同時
にモニタ用テレビカメラで撮像した映像を映し出すこと
ができるようにしたテレビインターホンシステムが開発
され使用されるようになってきた．
このようなテレビインターホンシステムは第３図に示す
ように、玄関先等に設けられていた子機１の呼出釦２を
操作すると、一対のペア線がらなる伝送線３を通じて室
内に設けられた親機４に呼出信号が伝送され、呼出音が
親機４に設けられたスピーカ５から出力され、子機１の
モニタ用テレビカメラ６には電源が供給されて、モニタ
用テレビカメラ６の映像信号が上記伝送＆！３を通じて
親機４に送られ、モニタテレビ７で映像として映し出さ
れるとともに、住居人がハンドセット８を取り上げて応
対すると通話ができるにようになっている．
第４図は第３図図示のインターホンシステムのブロック
図を示す．図示するように親機４は子機１に電源を供給
するための電源重畳回路９と、ハンドセット８からの通
話音声信号によって高周波信号を変調する変調部１０と
、子機１側より送出された被変調信号を復調して通話音
声信号を取り出す復調部１１と、子機１から送出された
映像信号を受信してモニタテレビ７に出力する映像信号
受信部１２と、同じく子機１側にて送出された呼出信号
を受信してスビーカ鳴動用信号を発生させる呼出検出部
１３と、上記回路群と伝送線３との間に介在して上記回
路群の不平衡信号を平衡化する平衡化回路１４と、短絡
保護回路４５とを備えている．変調部１０はハンドセッ
ト８からの通話音声信号を変調回路１０ａに入力し、第
１の搬送波となる高周波搬送波ｆ＋を変調し、バンドパ
スフィルタ１０ｂと、平衡化回路１４とを通じて伝送線
３に送り出す構成となっており、復調部１１は平衡化回
路１４からの被変調信号の周波数帯域を制限するバンド
バスフィルタｌｌａと、この被変調信号を復調するため
の復調回路１ｌｂと、音声信号増幅回路１１ｃとを有し
、音声信号増幅回路１１Ｃからの通話音声信号出力によ
りハンドセット８から千機１の通話音声を出力する構成
となっている．
一方子機１は伝送線３を介してｆｆｌｔｌｌ４より送出
された多重信号から子ＪＲ１の内部電源及びモニタ用テ
レビカメラ６の電源を分離するための電源分離部１５と
、マイク１６からの音声信号によって高周波搬送波を変
調する変調部１７と、親機４側より送出された被変調信
号を復調して、通話音声信号を取り出す復調部１８と、
モニタ用テレビカメラ６からの映像信号をビデオフィル
タ回路１９とを通じて親機４側へ送出する映像系回路と
、呼出釦２の操作によって親機４側への呼出通知を行う
呼出信号発生回路４６と、上記回路群と伝送線３との間
に介在して上記回路群の不平衡信号を平衡化する平衡化
回路２０と、無極性化回路４４とを備えている．変調部
１７はマイク信号を一定レベルまで増幅するマイク信号
増幅回路１７ａからの出力信号を変調回路１７ｂに入力
し、第２の搬送波（親ｆｉ４側の第１の搬送波ｆ１とは
区別できる高周波搬送波となっている）となる高周波搬
送波ｆ２を変調してバンドパスフィルタ１７ｃを通じて
送出する楕成となっており、復調部１８は平衡化回路２
０からの被変調信号の周波数帯域を制限するバンドバス
フィルタ１８ａと、この被変調信号を復調するための復
調回路１８ｂと、音声信号増幅回路１８ｃとを有してお
り、音声信号増幅回路１８ｃからの通知音声信号出力に
よりスピー力２１から親機４側の通知音声を出力する楕
或となっている．
また電源分離部１５はｍｆｉ４ｆｆｌより送出された多
重信号から電源を分離する電源分離回路１５ａと、該電
源分離回路１５ａからの電源出力値の有意な変化を検出
してモニタ用テレビカメラ６、及び子機回路への電源の
オン／オフを制御する電源スイッチ１５ｂと、供給電源
電流を一定に保つためのシャントレギュレータ１５ｃと
から構成されている．
このような親機４と子機１とは親機４側に設けた接続端
子Ｔ ２ ， Ｔ ２゜と、子機１ｆｆｌｌに設けた接
続端子Ｔ，，Ｔ．’とが夫々平行電線等からなる伝送線
３で接続され、上述したように伝送線３を介して親機４
と子機１との間には電源の他に情報連絡に必要な映像信
号、通話音声信号、呼出信号が多重伝送されるのである
．
ところで上述した構成のインターホンシステムでは、待
機時に千機１には電力は供給されないが、伝送線３間に
待機時電圧がバイアスされている．この待機時に子機１
の呼出釦２を操作すると、呼出信号発生回路４６で伝送
線３間の電圧を変化させることによって呼出信号を発生
し、ＪＩＩＩＪ！１４の呼出検出部１３で呼出信号を検
知すると、スビー力５で呼び出し音の鳴動を行なう。こ
のようにして呼出された親機４では、電源重畳回路９に
おいて一定電流を送出して子機電源を供給する．この定
電流出力は子機１の電源分離回路１５ａで分離出力され
て電源スイッチ１５ｂを起動し、シャントレギュレータ
１５ｃを通じてモニタ用テレビカメラ６及び子機回路の
電源として供給される．このようにして子機電源が供給
されるとモニタ用テレビカメラ６からの映像が親機４の
モニタテレビ７に映し出され、子機ｌと親機４間で通話
可能となる．
また、上記親機４から子機１への電源供給はタイマ動作
により一定時間がたつと停止するようになっている．
上記２＆ｌ式ＴＶインターホンシステムの親機４及び子
機１を複数台備え、中継アダプター２２を介して親機１
と子機４を接続するようなシステムも考えられている．
第５図は親機２台、子機２台からなるシステムを示して
いる．この第５図に示すシステムでは中継アダプター２
２において親機４ａ，４ｂと子機ｌａ，ｌｂの接続状態
を切換えて映像信号と通話音声信号の伝送及び子機１ａ
，ｌｂへの電力の供給を行なっている．この場合の親機
４ａ，４ｂ及び中継アダプター２２のブロック図を第６
図及び第７図に示す．
第６図図示の親機４が第２図の親機４と異なる点は、オ
フフック信号発生回路２３と親機停止信号検出回路２４
が加わった点で、他は全く同じである．オフフック信号
発生回路２３では通話のためにハンドセット８を取り上
げてフックスイッチ（図示せず〉がオフになると、オフ
フック信号を発生し、伝送線３に送出する．親機停止信
号検出回路２４では伝送線３に伝送された親機停止信号
を検出して、千機２ａ，２ｂへの電源供給紮停止する．
次に第７図図示の中継アダプター２２では、子機１ａ及
び千機１ｂと接続線３ａとの接続状態を切換えるスイッ
チＳ Ｗ ＋及びＳＷｚと、バッファアンプ２５と、親
機１ａ又は１ｂから動作時に送出される定電流を吸収す
る疑似負荷２６と、親機４ａ及び４ｂと接続線３ａ及び
疑似負荷２６との接続状態を切り換えるスイッチＳＷコ
及びＳＷ４と、子機１ａ及び１ｂからの呼出信号を検知
する呼出信号検知回路２７ａ及び２７ｂと、親機４ａ及
び４ｂに呼出信号を送出する親機呼出信号発生回路２８
ａ及び２８ｂと、親機４ａ及び４ｂから送出されるオフ
フック信号を検知するオフフック信号検知回路２９ａ及
び２９ｂと、親機４ａ及び４ｂに親機停止信号を送出す
る親機停止信号発生回路３０ａ及び３０ｂを備えている
．
この中継アダプター２２は待機時にはスイッチＳＷ，及
びＳＷ２をＮＣ接点側に接続し、各ＮＣ接点を電源（図
示せず）からの待機時電圧でバイアスしており、待機時
電圧を子機１ａ及び１ｂに伝送線３’ ，３’を介して
供給している．次にｌ台の子機、例えば１ａの呼出ｊ０
２を操作して呼出信号を発生させると、呼出信号検出回
路２７ａで呼出信号を検出し、スイッチＳ Ｗ ＋をＮ
Ｏ接点側に切換えるとともに制御信号を親機呼出信号発
生回路２８ａ及２８ｂに伝送する．親機呼出信号発生回
路２ ８’ａ及び２８ｂは制御信号を受信すると親機呼
出信号を親機４ａ及び４ｂを送出し両親機４ａ，４ｂを
起動させる．動作状態になった親機４ａと４ｂは定電流
をそれぞれ送出するが、今スイッチＳＷ，及びＳＷ４が
ＮＣ接点側に接続されているとすると、親機４ａから伝
送線３を介して送出された電流は子機１ａに供給されて
子ｅｌｌ １ ａを起動し、親機４ｂから送出された電
流は疑似負荷２６に吸収される．このようにして子機１
ａが起動すると親機４ａには直接、親機４ｂにはバッフ
ァアンプ３１を通して映像信号が伝送され、それぞれの
モニタテレビ７に映し出される．次に１台の親機、例え
ば４ｂで通話のためにハンドセット８が取り上げられた
とすると、親ｉ４ｂのオフフック信号発生回路２３から
オフフック信号が送出される．この信号をオフフック信
号検知回路２９ａで検知すると、スイッチＳＷ，及びＳ
Ｗ，をＮＯ接点側に切換えて親機４ｂを子機１ａと直接
接続し、親機４ａを疑似負荷２６と接続し、さらに制御
信号を親機停止信号発生回路３０ａに伝送する。制御信
号を受信した親機停止信号発生回路３０ａでは、親機停
止信号を親機４ａに送出する．親機４ａは親機停止信号
検知回路２４で親機停止信号を検知すると、親機４ａか
らの定電流の送出を停止し待機状態となる．このように
して親機４ｂと千機１ａは直接接続されて動作状態とな
っており、子機１ａからの映像は親機４ｂのモニタテレ
ビ７に映し出されて、通話可能な状態となり、通話を行
なわないｌｉｌｆｉ４ａは動作を停止する．以上ｆｆｌ
ｌｌＮ２台、子機２台の例を示したが、親機４又は子ａ
ｌｌの数が増えた場合も、対応するブロックが同じ数だ
け増えた構成となり、あとは同様の動作を行なう。[Detailed Description of the Invention] Industrial Field of Use] The present invention relates to a two-wire television intercom system with multi-channel communication. [Conventional technology] In order to make it possible to see guests indoors, a monitor TV camera is installed on the handset installed at the entrance, and a TV monitor is installed on the base unit installed indoors for calls. At the same time, a television intercom system that could display images captured by a monitor television camera was developed and began to be used. As shown in Fig. 3, in such a TV intercom system, when a call button 2 of a handset 1 installed at a doorway is operated, a call button 2 connected to a parent unit installed inside the room is transmitted through a transmission line 3 made up of a pair of wires. A calling signal is transmitted to the device 4, a ring tone is output from the speaker 5 provided on the base device 4, power is supplied to the monitor television camera 6 of the slave device 1, and the video signal of the monitor television camera 6 is output. The above transmission &! 3 to the base unit 4 and displayed as an image on the monitor television 7, and when the resident picks up the handset 8 and responds, a call can be made. Figure 4 shows a block diagram of the intercom system shown in Figure 3. As shown in the figure, the base unit 4 includes a power superimposing circuit 9 for supplying power to the handset 1, a modulation unit 10 for modulating a high-frequency signal using a voice signal from the handset 8, and a high-frequency signal transmitted from the handset 1 side. A demodulating section 11 that demodulates the modulated signal and extracts a call audio signal, and a video signal receiving section 12 that receives the video signal sent from the handset 1 and outputs it to the monitor television 7, also on the side of the handset 1. a call detection unit 13 that receives the transmitted call signal and generates a speaker ringing signal; and a balancing circuit that is interposed between the circuit group and the transmission line 3 and balances the unbalanced signals of the circuit group. 14 and a short circuit protection circuit 45. The modulation unit 10 inputs a call voice signal from the handset 8 to a modulation circuit 10a, modulates a high frequency carrier wave f+ serving as a first carrier wave, and sends it out to the transmission line 3 through a bandpass filter 10b and an equalization circuit 14. The demodulation unit 11 includes a bandpass filter lla that limits the frequency band of the modulated signal from the balancing circuit 14, a demodulation circuit 1lb for demodulating this modulated signal, and an audio signal amplification circuit 11c. The handset 8 is configured to output a 1,000-bit voice signal from the handset 8 by outputting a voice signal from the voice signal amplification circuit 11C. On the other hand, the handset 1 is connected to a power supply separation unit 15 for separating the internal power of the slave JR1 and the power of the monitor television camera 6 from the multiplexed signal sent from the ffltll4 via the transmission line 3, and the audio signal from the microphone 16. a modulation unit 17 that modulates a high-frequency carrier wave; a demodulation unit 18 that demodulates the modulated signal sent from the base unit 4 side and extracts a call voice signal;
A video system circuit that sends a video signal from the monitor television camera 6 to the base unit 4 side through the video filter circuit 19, and a calling signal generation circuit 46 that notifies the base unit 4 of a call by operating the call button 2. , a balancing circuit 20 interposed between the circuit group and the transmission line 3 to balance unbalanced signals of the circuit group, and a non-polarizing circuit 44. The modulation unit 17 inputs the output signal from the microphone signal amplification circuit 17a that amplifies the microphone signal to a certain level to the modulation circuit 17b, and converts it into a second carrier wave (a high-frequency carrier wave that can be distinguished from the first carrier wave f1 on the parent FI4 side). The demodulator 18 modulates the high frequency carrier wave f2 and sends it out through the bandpass filter 17c.
0, a demodulation circuit 18b for demodulating this modulated signal, and an audio signal amplification circuit 18c. When the notification audio signal is output, the speaker 21 outputs the notification audio from the base unit 4 side. The power source separation unit 15 also includes a power source separation circuit 15a that separates the power source from the multiplexed signal sent from the mfi4ffl, and a power source separation circuit 15a that detects a significant change in the power output value from the power source separation circuit 15a and connects the monitor television camera 6 and the It consists of a power switch 15b that controls on/off of power to the machine circuit, and a shunt regulator 15c that keeps the supplied power current constant. The base unit 4 and the slave unit 1 have connection terminals T 2 , T 2° provided on the base unit 4 side and connection terminals T 2 , T 2° provided on the slave unit 1ffll. ' are respectively connected by transmission lines 3 made of parallel electric wires, etc., and as mentioned above, the main unit 4
In addition to the power supply, video signals, voice calls, and call signals necessary for information communication are multiplexed between the handset 1 and the handset 1. By the way, in the intercom system having the above-mentioned configuration, power is not supplied to the Senki 1 during standby, but a standby voltage is biased between the transmission lines 3. During this standby, handset 1
When the call button 2 of the JIIIJ! When a call signal is detected by the call detection unit 13 of 14, a ring tone is sounded with a clear power of 5. In the base unit 4 that has been called up in this way, the power superimposing circuit 9 sends out a constant current to supply power to the slave unit. This constant current output is separated and outputted by the power separation circuit 15a of the handset 1, activates the power switch 15b, and is supplied as power to the monitor television camera 6 and the handset circuit through the shunt regulator 15c. When power is supplied to the handset in this way, the image from the monitor television camera 6 is displayed on the monitor television 7 of the base unit 4, and a conversation between the handset 1 and the base unit 4 becomes possible. Furthermore, the power supply from the base unit 4 to the slave unit 1 is stopped after a certain period of time has elapsed due to a timer operation. A plurality of base units 4 and slave units 1 of the above 2&l type TV intercom system are provided, and the base unit 1 is connected via a relay adapter 22.
A system is also being considered that connects the handset 4 and the handset 4. Figure 5 shows a system consisting of two master units and two slave units. In the system shown in Fig. 5, relay adapter 2
In step 2, the connection state between the base units 4a, 4b and the slave units la, lb is switched to transmit the video signal and call audio signal, and the slave unit 1a
, lb. The block diagram of the base units 4a, 4b and relay adapter 22 in this case is shown in the sixth figure.
It is shown in Fig. and Fig. 7. The main unit 4 shown in FIG. 6 differs from the main unit 4 in FIG. 2 in that an off-hook signal generation circuit 23 and a main unit stop signal detection circuit 24
Everything else is the same except that . When the handset 8 is picked up for a call and the hook switch (not shown) is turned off, the off-hook signal generation circuit 23 generates an off-hook signal and sends it to the transmission line 3.The base unit stop signal detection circuit 24 generates an off-hook signal and sends it to the transmission line 3. Detects the main unit stop signal transmitted to the main unit 3 and stops the power supply to the 1000 units 2a and 2b.Next, the relay adapter 22 shown in FIG. switches S W + and SWz that change the connection state between the base units 4a and 4b, the buffer amplifier 25, the pseudo load 26 that absorbs the constant current sent out from the base unit 1a or 1b during operation, and the connection lines 3a and 4b between the base units 4a and 4b. Switches SW and SW4 that change the connection state with the pseudo load 26, calling signal detection circuits 27a and 27b that detect the calling signals from the handsets 1a and 1b, and the base unit that sends the call signal to the base units 4a and 4b. Call signal generation circuit 28
a and 28b, off-hook signal detection circuits 29a and 29b that detect off-hook signals sent from the base units 4a and 4b, and base unit stop signal generation circuits 30a and 30b that send a base unit stop signal to the base units 4a and 4b. It is equipped with During standby, this relay adapter 22 connects the switches SW and SW2 to the NC contact side, and biases each NC contact with a standby voltage from a power source (not shown), so that the standby voltage is connected to the slave units 1a and 1b. is supplied via transmission lines 3' and 3'. Next, call j0 of l handsets, for example 1a.
2 to generate a calling signal, the calling signal detection circuit 27a detects the calling signal, and the switch S W + is set to N.
At the same time as switching to the O contact side, a control signal is transmitted to the base unit calling signal generation circuits 28a and 28b. When the parent unit calling signal generation circuits 2 8'a and 28b receive the control signal, they send out a parent unit calling signal to the parent units 4a and 4b to activate the parent units 4a and 4b. The base units 4a and 4b that are in the operating state each send out a constant current, but if switches SW and SW4 are now connected to the NC contact side, the current is sent from the base unit 4a via the transmission line 3. The current is supplied to the slave device 1a to start the slave device 1a, and the current sent from the master device 4b is absorbed by the pseudo load 26. In this way, handset 1
When a is activated, a video signal is transmitted directly to the base unit 4a and through the buffer amplifier 31 to the base unit 4b, and is displayed on the respective monitor televisions 7. Next, when the handset 8 is picked up by one base unit, for example 4b, for a call, an off-hook signal is sent from the off-hook signal generation circuit 23 of the base i4b. When this signal is detected by the off-hook signal detection circuit 29a, the switches SW and S
W, is switched to the NO contact side to directly connect the base unit 4b to the slave unit 1a, connect the base unit 4a to the pseudo load 26, and further transmit the control signal to the base unit stop signal generation circuit 30a. The base unit stop signal generation circuit 30a that has received the control signal sends a base unit stop signal to the base unit 4a. When the base unit 4a detects the base unit stop signal by the base unit stop signal detection circuit 24, the base unit 4a stops sending out the constant current and enters a standby state. In this way, the base unit 4b and the Senki 1a are directly connected and in operation, and the image from the slave unit 1a is displayed on the monitor TV 7 of the base unit 4b, making it possible to talk. lilfi4a that does not perform this operation will stop operating. That's all ffl
An example of 2 llNs and 2 slave units is shown, but base unit 4 or slave a
Even when the number of ll increases, the configuration is such that the number of corresponding blocks increases by the same number, and the rest of the operation is the same.
［発明が解決しようとする課題］
上記複数台の親機、複数台の子機とからなる２線式ＴＶ
インターホンシステムでは中継アダプター２２から、動
作中の親機４ａ・・・の動作を停止し待機状態とするた
めに、中継アダプター２２に親機停止信号発生回路３０
ａ・・・を備え、親機４ａ・・・に親機停止信号検出回
路２４を備えるといった非常に複雑な構成となっている
．
本発明は上述の問題点に鑑みて為されたもので、親機、
子機それぞれ複数台備えた２線式ＴＶインターホンシス
テムにおいて、非常に簡略な構成で、通話を行なわない
親機を停止させることができる２線式ＴＶインターホン
システムを提供することを目的とする．
［課題を解決するための手段コ
本発明はモニタ用テレビカメラを付設した子機と、モニ
タテレビを備えた親機とを一対のペア線からなる伝送線
で接続して、親機から子機への電力供給と、子機から親
機への映像信号、及びｍ機と子機間の通話音声信号の伝
送を行なう２線式ＴＶインターホンシステムにおいて、
複数台の親機と、複数台の子機と、これら親機と子機と
の間に介在する中継アダプターとを備え、該中継アダプ
ターには、親機と子機との接続状態を切換えて親機から
子機への電力供給と、子機から親機への映像信号及び親
機と子機間の通話信号の伝送を行なう切り換え手段を設
け、各親機には該切り換え手段による伝送線開放によっ
て当該親機から子機へ送出される電流が零になったこと
を検出すると当該親器の動作を停止させる電流検出回路
を設けたものである．
［作用］
本発明によれば、複数台の親機と、複数台の子機とから
なる２線式ＴＶインターホンシステムにおいて、１台の
子機からの呼び出しに応じて、総ての親機が動作状態に
あり、通話を行うべき親機を除いた他の親機の動作を停
止させる場合に、停止させる親機に接続されている伝送
線を中継アダプターの切り換え手段によって開放状態に
することにより、伝送線が開放された親機では具備した
電流検出回路において当該親機から送出される電流が零
になったことを検出し、当該親機の動作を停止すること
ができるのである．従ってｉｎに電流検出回路を備える
だけの非常に簡略な構成で、動作を停止させたい親機に
接続している伝送線を中継アダプター側で開放状態にす
ることにより、動作中の親機の動作を停止できるのであ
る．［実施例コ
本発明の実施例を図を用いて説明する．第１図は本発明
による２線式ＴＶインターホンシステムに用いる親機４
の実施例のブロック図である．この親機４はオフフック
信号発生回路３２と電流検出回路３３が加わった他は第
４図図示の親機４と同じ構成である．ｔ流検出回路３３
は親機４の動作時に子機電源用に送出される定電流を検
出し、伝送線３が開放状態となって電流値が零になった
場合に当該親機４の動作を停止させる機能を持つもので
ある．
第２図は中継アダプター２２の実施例のブロック図及び
親機４、子機１、中継アダプター２２の接続状態を示す
図である。中継アダプター２２の構成は疑似負荷２６と
スイッチＳＷ，の間にスイッチＳＷ５を接続し、親機停
止信号発生回路を省略した点と、親機として第１図図示
の親機４を２台の親器４ａ及び４ｂに用いている他は第
７図図示の構成と同じ構戒である．
この中継アダプター２２は待機時にはスイッチＳＷ，及
びＳＷ２をＮＣ接点側に、スイッチＳＷ，をＮｏ接点側
に接続し、スイッチＳＷ．，ＳＷ２のＮＣ接点に待機時
電圧をバイアスして、待機時電圧を子機１ａ及び１ｂに
供給している．次に１台の子機、例えば１ａの呼出釦２
を操作して呼出信号を発生させると、呼出信号検知回路
２７ａで呼出信号を検出し、スイッチＳ Ｗ ＋をＮｏ
接点側に切り換え、スイッチＳＷ，をＮＣ接点側に切換
えるとともに制御信号を親機呼出信号発生回路２８ａ及
び２８ｂに伝送する．親機呼出信号発生回路２８ａ及び
２８ｂは制御信号を受信すると親機呼出信号を親機４ａ
及び４ｂに送出し両親機４ａ，４ｂを起動させる．動作
状態になった親機４ａと４ｂは定電流を夫々送出するが
、スイッチＳＷツ及びＳＷ，がＮＣ接点側に接続されて
いるとすると、親機４ａから送出された電流は伝送線３
、接続線３ａ、伝送線３゛を介して子機１ａに供給され
て子機３を起動し、親機４ｂから送出された電流は疑似
負荷２６に吸収される．このようにして子機１ａが起動
すると親機４ａには直接、親機４ｂにはバッファアンプ
３１を通して映像信号が伝送され、それぞれのモニタテ
レビ７に映し出される．ここでｌ台の親機、例えば４ｂ
で通話のためにハンドセット８が取り上げられたとする
と、親機４ｂのオフブック信号発生回路３２がらオフフ
ック信号が送出され、この信号をオフフック信号検出回
路２８ｂが検知するとスイッチＳＷ，、ＳＷ，、ＳＷｓ
をＮｏ接点側に切り換え、親機４ｂ側の伝送線３が開放
された状態にする．そうすると親機４ａの電流検出回路
３３において親機４ａから送出する電流が零になったこ
とを検出し、当該親機４ａの動作を停止させるのである
．
［発明の効果］
本発明は叙述のように２線式ＴＶインターホンシステム
において、複数台の親機と、複数台の子機と、これら親
機と子機との間に介在する中継アダプターとを備え、該
中継アダプターには、親機と子機との接続状態を切換え
て親機から子機への電力供給と、子機から親機への映像
信号及び親機と子機間の通話信号の伝送を行なう切り換
え手段を設け、各親機には該切り換え手段による伝送線
開放によって当該親機から子機へ送出される電流が零に
なったことを検出すると当該親器の動作を停止させる電
流検出回路を設けたので、動作を停止させる親機に接続
されている伝送線を中継アダプターの切り換え手段によ
って開放状態にすることにより、伝送線が開放された親
機では具備した電流検出回路が当該親機から送出される
電流が零になったことを検出して当該親機の動作を停止
させることができるものであって、親機に電流検出回路
を備えるだけの簡略な構戒で、通話を行なわない親機の
動作を停止することでき、複数台の親機と複数台の子機
とを接続した２線式ＴＶインターホンシステムを安価に
構築できるという効果がある．[Problem to be solved by the invention] A two-wire TV consisting of the plurality of master units and the plurality of slave units described above.
In the intercom system, a base unit stop signal generation circuit 30 is transmitted from the relay adapter 22 to the relay adapter 22 in order to stop the operation of the currently operating base unit 4a and put it in a standby state.
The base unit 4a... has a very complicated configuration including a base unit stop signal detection circuit 24. The present invention has been made in view of the above-mentioned problems.
The purpose of the present invention is to provide a two-wire TV intercom system which has a plurality of slave units each and which has a very simple configuration and can stop a base unit that is not making a call. [Means for Solving the Problems] The present invention connects a slave unit equipped with a monitor TV camera and a base unit equipped with a monitor TV using a transmission line consisting of a pair of wires, and transmits data from the base unit to the slave unit. In a two-wire TV intercom system that supplies power to the base unit, transmits video signals from the handset to the base unit, and transmits voice signals between the handset and the handset,
It is equipped with a plurality of base units, a plurality of slave units, and a relay adapter interposed between the base unit and the slave units, and the relay adapter is provided with a device for switching the connection state between the base unit and the slave units. A switching means is provided for supplying power from the base unit to the slave unit, transmitting video signals from the slave unit to the base unit, and communication signals between the base unit and the slave unit, and each base unit has a transmission line using the switching means. This device is equipped with a current detection circuit that stops the operation of the parent unit when it detects that the current sent from the parent unit to the slave unit becomes zero due to an open circuit. [Function] According to the present invention, in a two-wire TV intercom system consisting of a plurality of base units and a plurality of slave units, all the base units respond to a call from one slave unit. When stopping the operation of other base units other than the base unit that is in operation and is supposed to make a call, the transmission line connected to the base unit to be stopped is opened by switching means of the relay adapter. A base unit with an open transmission line is equipped with a current detection circuit that detects when the current sent from the base unit becomes zero, and can stop the operation of the base unit. Therefore, with a very simple configuration that only includes a current detection circuit on the in, by opening the transmission line connected to the base unit whose operation is to be stopped on the relay adapter side, the operation of the base unit that is currently in operation can be stopped. can be stopped. [Example] An example of the present invention will be explained using figures. Figure 1 shows a base unit 4 used in a two-wire TV intercom system according to the present invention.
FIG. This base unit 4 has the same configuration as the base unit 4 shown in FIG. 4, except that an off-hook signal generation circuit 32 and a current detection circuit 33 are added. T current detection circuit 33
has a function to detect the constant current sent to the power source of the slave unit when the base unit 4 is operating, and to stop the operation of the base unit 4 when the transmission line 3 becomes open and the current value becomes zero. It is something you have. FIG. 2 is a block diagram of an embodiment of the relay adapter 22 and a diagram showing the connection state of the base unit 4, the slave unit 1, and the relay adapter 22. The configuration of the relay adapter 22 is that the switch SW5 is connected between the pseudo load 26 and the switch SW, the main unit stop signal generation circuit is omitted, and the main unit 4 shown in FIG. The configuration is the same as that shown in Fig. 7, except that it is used for vessels 4a and 4b. During standby, this relay adapter 22 connects the switches SW and SW2 to the NC contact side, the switch SW to the No contact side, and connects the switch SW. , the standby voltage is biased to the NC contacts of SW2, and the standby voltage is supplied to the handsets 1a and 1b. Next, press the call button 2 of one handset, for example 1a.
When a ringing signal is generated by operating , the ringing signal detection circuit 27a detects the ringing signal, and the switch S W + is set to No.
At the same time, the switch SW is switched to the NC contact side and the control signal is transmitted to the base unit calling signal generation circuits 28a and 28b. When the base unit calling signal generation circuits 28a and 28b receive the control signal, the base unit calling signal generation circuits 28a and 28b transmit the base unit calling signal to the base unit 4a.
and 4b to start the send-out parent units 4a and 4b. The base units 4a and 4b that are in the operating state each send out a constant current, but if the switches SW and SW are connected to the NC contact side, the current sent from the base unit 4a is transmitted through the transmission line 3.
, the current is supplied to the handset 1a via the connection line 3a and the transmission line 3' to start the handset 3, and the current sent from the base unit 4b is absorbed by the pseudo load 26. When the handset 1a is activated in this manner, the video signal is transmitted directly to the base unit 4a and to the base unit 4b through the buffer amplifier 31, and is displayed on the respective monitor televisions 7. Here, l base units, for example 4B
When the handset 8 is picked up for a call, an off-hook signal is sent from the off-hook signal generation circuit 32 of the base unit 4b, and when this signal is detected by the off-hook signal detection circuit 28b, the switches SW, SW, SWs are activated.
Switch to the No contact side to open the transmission line 3 on the base unit 4b side. Then, the current detection circuit 33 of the base unit 4a detects that the current sent from the base unit 4a has become zero, and the operation of the base unit 4a is stopped. [Effects of the Invention] As described above, the present invention provides a two-wire TV intercom system that includes a plurality of base units, a plurality of slave units, and a relay adapter interposed between the base unit and the slave units. In addition, the relay adapter can switch the connection status between the parent device and the child device, supply power from the parent device to the child device, and transmit video signals from the child device to the parent device and call signals between the parent device and the child device. A switching means is provided for transmitting the transmission, and each base unit is configured to stop the operation of the base unit when it detects that the current sent from the base unit to the slave unit becomes zero due to the transmission line being opened by the switching unit. Since a current detection circuit is provided, by opening the transmission line connected to the base unit whose operation is to be stopped using the switching means of the relay adapter, the current detection circuit installed in the base unit with the transmission line opened can be activated. It is possible to stop the operation of the base unit by detecting that the current sent out from the base unit has become zero, and it has a simple structure of just equipping the base unit with a current detection circuit. It is possible to stop the operation of a base unit that is not making a call, and has the effect that a two-wire TV intercom system connecting multiple base units and multiple slave units can be constructed at a low cost.
第１図は本発明の実施例に使用の親機のブロック図、第
２図は同上使用の中継アダプターのブロック図、第３図
は従来の親機と子機とが１対１型の２線式ＴＶインター
ホンシステムの構戒図、第４図は従来の親機と子機とが
１対１型の２線式ＴＶインターホンシステムのブロック
図、第５図は親機２台、子機２台を備えた従来の２線式
ＴＶインターホンシステムの構成図、第６図は同上に用
いた親機のブロック図、第７図は従来の中継アダプター
のブロック図である．
１，ｌａ．ｌｂは子機、３，３゜は伝送線、４，４ａ，
４ｂは親機、７はモニタテレビ、２２は中継アダプター
、３３は電流検出回路、ＳＷ１・・・はスイッチである
．Figure 1 is a block diagram of the base unit used in the embodiment of the present invention, Figure 2 is a block diagram of the relay adapter used in the same example, and Figure 3 is a conventional two-way adapter in which the base unit and slave unit are one-to-one. A configuration diagram of a wire TV intercom system. Figure 4 is a block diagram of a conventional two-wire TV intercom system in which a base unit and a slave unit are one-to-one type. Figure 5 is a block diagram of a two-wire TV intercom system with two base units and two slave units. Figure 6 is a block diagram of the base unit used in the above, and Figure 7 is a block diagram of a conventional relay adapter. 1, la. lb is the handset, 3, 3° is the transmission line, 4, 4a,
4b is a base unit, 7 is a monitor TV, 22 is a relay adapter, 33 is a current detection circuit, SW1... is a switch.
Claims (1)
テレビを備えた親機とを一対のペア線からなる伝送線で
接続して、親機から子機への電力供給と、子機から親機
への映像信号、及び親機と子機間の通話音声信号の伝送
を行なう２線式ＴＶインターホンシステムにおいて、複
数台の親機と、複数台の子機と、これら親機と子機との
間に介在する中継アダプターとを備え、該中継アダプタ
ーには、親機と子機との接続状態を切換えて親機から子
機への電力供給と、子機から親機への映像信号及び親機
と子機間の通話信号の伝送を行なう切り換え手段を設け
、各親機には該切り換え手段による伝送線開放によって
当該親機から子機へ送出される電流が零になったことを
検出すると当該親器の動作を停止させる電流検出回路を
設けたことを特徴とする２線式ＴＶインターホンシステ
ム。(1) Connect the handset equipped with a TV monitor camera and the base unit equipped with a TV monitor using a transmission line consisting of a pair of wires, allowing power to be supplied from the base unit to the slave unit, and from the slave unit to the base unit. In a two-wire TV intercom system that transmits video signals to the base unit and voice signals between the base unit and the slave units, there are multiple base units, multiple slave units, and these base units and slave units. and a relay adapter that is interposed between the base unit and the slave unit, and the relay adapter switches the connection state between the base unit and the slave unit, supplies power from the base unit to the slave unit, and transmits video signals from the slave unit to the base unit. and a switching means for transmitting call signals between the base unit and the slave unit, and each base unit is provided with a signal indicating that the current sent from the base unit to the slave unit becomes zero when the transmission line is opened by the switching unit. A two-wire TV intercom system characterized by being provided with a current detection circuit that stops the operation of the main device when detected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1164391A JP2839152B2 (en) | 1989-06-27 | 1989-06-27 | 2-wire TV intercom system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1164391A JP2839152B2 (en) | 1989-06-27 | 1989-06-27 | 2-wire TV intercom system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0329583A true JPH0329583A (en) | 1991-02-07 |
| JP2839152B2 JP2839152B2 (en) | 1998-12-16 |
Family
ID=15792236
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1164391A Expired - Fee Related JP2839152B2 (en) | 1989-06-27 | 1989-06-27 | 2-wire TV intercom system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2839152B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013202261A (en) * | 2012-03-29 | 2013-10-07 | Aiphone Co Ltd | Nurse-call system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58141086A (en) * | 1982-02-15 | 1983-08-22 | Matsushita Electric Works Ltd | Television interphone system |
| JPS63252085A (en) * | 1987-04-09 | 1988-10-19 | Matsushita Electric Ind Co Ltd | Monitoring device |
| JPS63192787U (en) * | 1987-05-29 | 1988-12-12 |
-
1989
- 1989-06-27 JP JP1164391A patent/JP2839152B2/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58141086A (en) * | 1982-02-15 | 1983-08-22 | Matsushita Electric Works Ltd | Television interphone system |
| JPS63252085A (en) * | 1987-04-09 | 1988-10-19 | Matsushita Electric Ind Co Ltd | Monitoring device |
| JPS63192787U (en) * | 1987-05-29 | 1988-12-12 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013202261A (en) * | 2012-03-29 | 2013-10-07 | Aiphone Co Ltd | Nurse-call system |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2839152B2 (en) | 1998-12-16 |
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| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |