JPH04345223A - Power supply interrupt alarm circuit - Google Patents
Power supply interrupt alarm circuitInfo
- Publication number
- JPH04345223A JPH04345223A JP3118162A JP11816291A JPH04345223A JP H04345223 A JPH04345223 A JP H04345223A JP 3118162 A JP3118162 A JP 3118162A JP 11816291 A JP11816291 A JP 11816291A JP H04345223 A JPH04345223 A JP H04345223A
- Authority
- JP
- Japan
- Prior art keywords
- video signal
- signal
- received
- circuit
- power
- 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.)
- Pending
Links
- 230000005540 biological transmission Effects 0.000 claims abstract description 13
- 238000010586 diagram Methods 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 1
Landscapes
- Monitoring And Testing Of Transmission In General (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明はビデオ信号送受信装置の
電源断警報回路に関し、特に、送信側の電源断時に受信
側への入力断警報の送出を制御する電源断警報回路に関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power-off alarm circuit for a video signal transmitting/receiving device, and more particularly to a power-off alarm circuit for controlling transmission of an input-off alarm to a receiving side when power is cut off on a transmitting side.
【０００２】0002
【従来の技術】図２は従来の電源断警報回路の一例のブ
ロック図である。2. Description of the Related Art FIG. 2 is a block diagram of an example of a conventional power failure alarm circuit.
【０００３】従来例は送信装置と受信装置との間に、ビ
デオ信号を送受信する信号用ケーブル１３と、送信装置
の電源１２の電源断情報（スイッチＳ）を伝達するメタ
リックケーブル１４と、メタリックケーブル１４により
検出した電源断情報を受信器１６に出力する警報回路１
７とを有して構成される。In the conventional example, a signal cable 13 for transmitting and receiving video signals, a metallic cable 14 for transmitting power-off information (switch S) of the power source 12 of the transmitting device, and a metallic cable are provided between the transmitting device and the receiving device. Alarm circuit 1 outputs power failure information detected by 14 to receiver 16
7.
【０００４】0004
【発明が解決しようとする課題】上述した従来の電源断
警報回路は、送受信装置間に信号用ケーブルと共にメタ
リックケーブルを同時に設置しなければ、送信側の電源
断情報を受信側へ伝送することができなかった。[Problems to be Solved by the Invention] The conventional power failure alarm circuit described above cannot transmit power failure information from the transmitting side to the receiving side unless a metallic cable is installed together with a signal cable between the transmitting and receiving devices. could not.
【０００５】[0005]
【課題を解決するための手段】本発明の電源断警報回路
は、電源回路の電源が断となったとき出力中のビデオ信
号を即時停止するビデオ信号即断回路と、前記ビデオ信
号をパルス周波数変調し前記電源が断のとき搬送波を所
定時間送出するパルス周波数変調回路と、前記ビデオ信
号または前記搬送波を伝送路に送信する送信器と、前記
伝送路からの受信した信号を出力する受信器と、入力の
前記信号を復調し受信のビデオ信号として出力するパル
ス周波数復調回路と、前記受信の信号と前記ビデオ信号
とが断のとき入力断警報を発生し前記受信の信号レベル
が正常で前記受信のビデオ信号が断のとき前記入力断警
報の発生を禁止する警報回路とを有する。[Means for Solving the Problems] The power-off alarm circuit of the present invention includes a video signal immediate-off circuit that immediately stops the video signal being output when the power of the power supply circuit is cut off, and a pulse frequency modulation circuit for the video signal. a pulse frequency modulation circuit that transmits a carrier wave for a predetermined period of time when the power is off; a transmitter that transmits the video signal or the carrier wave to a transmission line; and a receiver that outputs the signal received from the transmission line. a pulse frequency demodulation circuit that demodulates the input signal and outputs it as a received video signal; and a pulse frequency demodulation circuit that generates an input disconnection alarm when the received signal and the video signal are disconnected; and an alarm circuit that prohibits generation of the input cutoff alarm when the video signal is cut off.
【０００６】[0006]
【実施例】次に、本発明について図面を参照して説明す
る。図１は本発明の一実施例のブロック図である。DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be explained with reference to the drawings. FIG. 1 is a block diagram of one embodiment of the present invention.
【０００７】ビデオ信号即断回路１は、電源４の電源が
断となったとき出力中のビデオ信号を即時停止する。パ
ルス周波数変調回路２は、ビデオ信号をパルス周波数変
調し、電源が断のとき搬送波を所定時間送出する。送信
器３は、変調されたビデオ信号または電源断時の搬送波
を伝送路５に送信する。受信器６は伝送路５から受信し
た信号を出力する。パルス周波数復調回路７は、受信器
６から入力の信号を復調し受信のビデオ信号として出力
する。警報回路８は受信の信号と受信のビデオ信号とが
断のとき入力断警報を端子１１に発生し、受信の信号レ
ベルが正常で受信のビデオ信号が断のとき入力断警報の
発生を禁止する。The video signal instant cutoff circuit 1 immediately stops the video signal being output when the power source 4 is turned off. The pulse frequency modulation circuit 2 pulse frequency modulates the video signal and sends out a carrier wave for a predetermined period of time when the power is turned off. The transmitter 3 transmits the modulated video signal or the carrier wave when the power is turned off to the transmission line 5. The receiver 6 outputs the signal received from the transmission line 5. The pulse frequency demodulation circuit 7 demodulates the input signal from the receiver 6 and outputs it as a received video signal. The alarm circuit 8 generates an input disconnection alarm at the terminal 11 when the receiving signal and the receiving video signal are disconnected, and prohibits generation of the input disconnection alarm when the receiving signal level is normal and the receiving video signal is disconnected. .
【０００８】次に本実施例の動作について説明すると、
送信装置の電源４のスイッチをオフにしたとき、ビデオ
信号即断回路１では連動スイッチにより即時に電源供給
が断になり、パルス周波数変調回路２では電源供給回路
の大客量のコンデンサが放電する迄のパルス周波数変調
の搬送波を送出する。送信器３はパルス変調されたビデ
オ信号又は電源オフ時の搬送波を伝送路５に出力する。
受信装置では、送信器３で送信された伝送路５からの信
号を受信器６で受信する。パルス周波数復調回路７はパ
ルス周波数変調されたビデオ信号を復調する。警報回路
８は、受信器６からの搬送波レベルと復調されたビデオ
信号とを監視し、搬送波レベルとビデオ信号レベルとが
断のときは入力断警報を端子１１に出力し、搬送波レベ
ルが正常でありビデオ信号が断のときは入力断警報の出
力を行わない。Next, the operation of this embodiment will be explained.
When the power supply 4 of the transmitting device is turned off, the video signal instant cut-off circuit 1 immediately cuts off the power supply by the interlocking switch, and the pulse frequency modulation circuit 2 waits until the large capacity capacitor of the power supply circuit is discharged. A pulse frequency modulated carrier wave is transmitted. The transmitter 3 outputs a pulse-modulated video signal or a carrier wave when the power is off to the transmission line 5. In the receiving device, a receiver 6 receives the signal transmitted from the transmission path 5 by the transmitter 3 . The pulse frequency demodulation circuit 7 demodulates the pulse frequency modulated video signal. The alarm circuit 8 monitors the carrier wave level from the receiver 6 and the demodulated video signal, and outputs an input disconnection alarm to the terminal 11 when the carrier wave level and the video signal level are disconnected, indicating that the carrier wave level is normal. Yes When the video signal is cut off, the input cutoff alarm will not be output.
【０００９】[0009]
【発明の効果】以上説明したように本発明は、送信装置
の電源断情報を搬送波により伝送路で受信装置へ伝達す
ることにより、電源断情報伝送用のメタリックケーブル
を設置する必要がないという効果がある。[Effects of the Invention] As explained above, the present invention has the advantage that there is no need to install a metallic cable for transmitting power-off information by transmitting power-off information from a transmitting device to a receiving device via a transmission path using a carrier wave. There is.
【図１】本発明の一実施例のブロック図である。FIG. 1 is a block diagram of one embodiment of the present invention.
【図２】従来の電源断警報回路の一例のブロック図であ
る。FIG. 2 is a block diagram of an example of a conventional power-off alarm circuit.
１ ビデオ信号即断回路 ２ パルス周波数変調回路 ３ 送信器 ４ 電源 ５ 伝送路 ６ 受信器 ７ パルス周波数復調回路 ８ 警報回路 1 Video signal instant cutoff circuit 2 Pulse frequency modulation circuit 3 Transmitter 4 Power supply 5 Transmission line 6 Receiver 7 Pulse frequency demodulation circuit 8 Alarm circuit
Claims (1)
中のビデオ信号を即時停止するビデオ信号即断回路と、
前記ビデオ信号をパルス周波数変調し前記電源が断のと
き搬送波を所定時間送出するパルス周波数変調回路と、
前記ビデオ信号または前記搬送波を伝送路に送信する送
信器と、前記伝送路からの受信した信号を出力する受信
器と、入力の前記信号を復調し受信のビデオ信号として
出力するパルス周波数復調回路と、前記受信の信号と前
記ビデオ信号とが断のとき入力断警報を発生し前記受信
の信号レベルが正常で前記受信のビデオ信号が断のとき
前記入力断警報の発生を禁止する警報回路とを有するこ
とを特徴とる電源断警報回路。1. A video signal instant cut-off circuit that immediately stops the video signal being output when the power of the power supply circuit is cut off;
a pulse frequency modulation circuit that modulates the video signal with a pulse frequency and transmits a carrier wave for a predetermined time when the power source is turned off;
a transmitter that transmits the video signal or the carrier wave to a transmission path; a receiver that outputs the signal received from the transmission path; and a pulse frequency demodulation circuit that demodulates the input signal and outputs it as a received video signal. , an alarm circuit that generates an input disconnection alarm when the received signal and the video signal are disconnected, and prohibits generation of the input disconnection alarm when the received signal level is normal and the received video signal is disconnected. A power-off alarm circuit characterized by having:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3118162A JPH04345223A (en) | 1991-05-23 | 1991-05-23 | Power supply interrupt alarm circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3118162A JPH04345223A (en) | 1991-05-23 | 1991-05-23 | Power supply interrupt alarm circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04345223A true JPH04345223A (en) | 1992-12-01 |
Family
ID=14729642
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3118162A Pending JPH04345223A (en) | 1991-05-23 | 1991-05-23 | Power supply interrupt alarm circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04345223A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0376327A (en) * | 1989-08-17 | 1991-04-02 | Nec Corp | System for inhibiting transmission of optical input interruption information |
-
1991
- 1991-05-23 JP JP3118162A patent/JPH04345223A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0376327A (en) * | 1989-08-17 | 1991-04-02 | Nec Corp | System for inhibiting transmission of optical input interruption information |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 19970311 |