JP3585179B2 - TV intercom system - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a television intercom system that can be called by pressing a call button from a door phone even while a visitor is being monitored on a monitor television of an intercom.
[0002]
[Prior art]
Conventionally, in a TV intercom, when a monitor button is operated to operate a door phone TV camera and a scene of the front door is displayed on a monitor TV and monitored, even if a visitor operates a call button of the intercom, the intercom can be operated. The ring tone does not ring on the side, and the back tone does not ring on the camera intercom.
[0003]
Also, once the monitor button is operated to enter the monitor mode, the visitor is displayed on the monitor television for a predetermined time, and until the time has elapsed, the visitor calls the intercom unless the monitor operation is canceled. Even if the button is operated, the intercom side does not sound the ringing tone and the intercom with camera does not sound the back tone.
For this reason, during the monitoring, the intercom cannot know the visitor, and the visitor himself does not sound a ringing tone, so that it is determined that the call cannot be made and the visitor may leave as it is.
[0004]
[Problems to be solved by the invention]
The present invention has been proposed in order to solve these problems. The purpose of the present invention is to press the monitor button on the intercom side of the television intercom so that the intercom can be called even when the intercom side scene is being monitored. , And a TV intercom system that enables confirmation.
[0005]
[Means for Solving the Problems]
The television intercom system according to claim 1, proposed to achieve the above object, is configured by connecting an intercom with a camera and an intercom with a monitor television, and a call signal from the intercom with a camera is provided on the interphone with a monitor television. A call detection circuit that detects a ringtone, a ringtone generation circuit that outputs a ringtone when the call detection circuit detects a ringtone from the doorphone with camera, and a backtone generation circuit that outputs a backtone to the doorphone with camera. When the call detection circuit detects a call signal while supplying power to the camera doorphone and monitoring the video and audio, the call sound is output and the sound output from the speaker is cut off. Means.
[0006]
In the television intercom system according to the second aspect, the intercom with camera and the intercom with monitor television are connected and configured via a two-wire signal line that multiplexes and transmits a video signal, an audio signal, and a control signal. I have.
Further, in the TV intercom system according to the third aspect, the intercom with camera and the intercom with monitor TV are connected to each other via a video line transmitting a video signal and a communication line transmitting an audio signal and a control signal. I have.
[0007]
[Action]
According to the television intercom system according to claim 1, the monitor button of the intercom is operated, the power is supplied to the television camera of the camera-equipped doorphone, and while the video is being projected on the monitor television, the visitor can use the doorphone. When the call button is operated, the call detection circuit on the intercom side detects this.
Then, the control means activates the ringing tone generation circuit and the back tone generation circuit, and thereafter cuts off the sound output from the speaker.
[0008]
As a result, a ringing tone is output from the intercom, and a back tone is output from the door phone with camera. In addition, since the sound output from the speaker is cut off, no sound is output from the door phone, and the call sound can be clearly heard while checking the image of the visitor displayed on the monitor television.
According to the television intercom according to claim 2, audio, video, and control signals are transmitted and received by multiplex transmission between the doorphone and the interphone via a two-wire signal line. A video signal is transmitted and received between the doorphone and the interphone via a video line, and an audio signal and a control signal are transmitted and received via a communication line.
[0009]
【Example】
An embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is a block diagram showing a main part of a television interphone according to the present invention, and FIG. 2 is a diagram showing a change in line voltage generated in a two-wire signal line between a doorphone and an interphone.
The TV intercom A includes a call button 10 for calling a door phone, a monitor button 11 for supplying power to a television camera of a door phone with camera (not shown), and displaying an image on a monitor television (not shown), and a door phone. A call indicator light 12 that lights up during a call is provided, and a microcomputer (CPU) is used as control means. Further, a power supply circuit section 8 is provided to supply power to the internal power supply of the intercom A and a TV camera of the door phone, and a television circuit section 9 is provided to drive the monitor television.
[0010]
1 is a call detection circuit for detecting a call signal from a door phone with a camera, 2 is a ring tone generation circuit for generating a ring tone, and 3 is a back tone generation for generating a back tone to be output to the door phone side when a door phone is called. The circuit 4 is a control means composed of a CPU, and 5 is a call control for sending out a voice input through the microphone Mic to the modulation circuit 61 and outputting a voice signal demodulated by the demodulation circuit 62 from the speaker Sp. It is a circuit and includes an audio amplifier circuit (not shown) for controlling the output level of the audio signal.
[0011]
In this example, a two-wire circuit 7 is provided between the intercom A and the intercom, and the audio signal and the control signal are transmitted to the intercom via a two-wire signal line. , An audio signal, and a control signal. The audio signal transmitted between the intercom A and the doorphone during a call is modulated by the modulation circuit 61 to the doorphone and transmitted, and the audio signal transmitted from the doorphone is demodulated by the demodulation circuit 62. I have.
[0012]
Next, the basic operation of the television intercom system according to the present invention will be described. When the monitor button 11 of the intercom A is operated, the line voltage of the two-wire signal line is reduced from 15 V during standby to 6 V. Therefore, the control means 4 detects this state, activates the power supply circuit section 8 and Power is supplied to the television camera of the door phone with camera through the linear signal line L. As a result, the TV camera of the intercom outputs a video signal, and the video signal transmitted through the two-wire signal line L is input to the TV circuit unit 9 and is displayed as a video on a monitor TV (not shown). It is.
[0013]
Such monitor display by the monitor television is performed continuously for a preset time, for example, about 30 seconds. During this time, when the visitor presses the call button 10 of the door phone, the two-wire signal line L The intermediate voltage is lower than 15 V by about 0.3 V, and this state is detected by the call detection circuit 1.
Then, the control means 4 activates the ringing tone generation circuit 2 and the back tone generation circuit 3, outputs a control signal to the call control circuit 5, and sends a mute signal to an audio signal amplification circuit (not shown) incorporated therein. To reduce the output level of the audio signal.
As a result, the video is continuously displayed on the monitor television of the intercom A, and the ringing sound is output from the speaker of the intercom A, but the audio signal from the speaker is muted. At this time, a back tone for confirming a call to intercom A is output from the intercom.
[0014]
According to such an intercom, a call can be made from the intercom even while the monitor television of the intercom A is monitoring the image, and the monitor button 11 is re-input within a preset time, for example, 30 seconds. Is operated, a monitor display is further performed, and a call can be made from the door phone. Then, after 30 seconds, the intercom returns to the standby state.
[0015]
FIG. 3 shows an operation transition diagram in the intercom system of the present invention.
[0016]
【effect】
As described above, according to the present invention, even while the video from the intercom is being monitored and displayed on the monitor television of the intercom, a ringing tone is output in response to a call from the intercom to the intercom, A back tone can be output for a door phone call. Therefore, even during monitoring, without interfering with the monitoring operation, the intercom can confirm the call from the intercom by the ringing tone, and the intercom can output the back tone to confirm the call by ear.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an internal circuit of an intercom with a monitor television of a television intercom system according to the present invention.
FIG. 2 is a diagram showing a change in line voltage occurring in a two-wire signal line of the television intercom system of the present invention.
FIG. 3 is an operation transition diagram in the television intercom system of the present invention.
[Explanation of symbols]
A Interphone with monitor TV L 2-wire signal line 1 Ring detection circuit 2 Ring sound generation circuit 3 Back tone generation circuit 4 Control means

Claims (3)

In a TV intercom system configured by connecting an intercom with camera and an intercom with monitor TV,
A call detection circuit that detects a call signal from a door phone with a camera on the intercom side with a monitor TV,
A ring tone generating circuit that outputs a ring tone when the call detection circuit detects a ring tone from the camera doorphone;
A back tone generating circuit for outputting a back tone to a door phone with a camera,
When the call detection circuit detects a call signal while supplying power to the camera doorphone and monitoring the video and audio, the call sound is output and the sound output from the speaker is cut off. And a television intercom system. 2. The television intercom according to claim 1, wherein the camera intercom and the monitor television intercom are connected via a two-wire signal line that multiplexes and transmits a video signal, an audio signal, and a control signal. system. 2. The television intercom according to claim 1, wherein the camera intercom and the monitor television intercom are connected via a video line for transmitting a video signal and a communication line for transmitting an audio signal and a control signal. system.

Images