JP2000216897A - Interphone system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress power consumption when an interphone is not used by detecting a video signal inputted to a video signal amplifying part and supplying power to the video signal amplifying part only when the video signal is detected. SOLUTION: A video signal outputted from a video controller 11 is modulated and outputted. The video signal is amplified by an amplifier 20 and is inputted to a detector 21. The detector 21 takes out a signal around a carrier frequency by a resonance filter and the signal is rectified by a rectifier. It is integrated and the value of the output signal of an integrated circuit is compared with a value which is previously set. A power switch 22 controls the supply of power to an amplifying circuit 23 based on a power ON/OFF signal from the detector 21. When the video signal from the video controller 11 is not outputted, the supply of power to the amplifying circuit 23 is stopped and the supply of power to the amplifying circuit 23 is started only when the video signal from the video controller 11 is outputted. The amplifying circuit 23 receives the supply of power and executes an amplifying operation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intercom system used in an apartment house or the like, and more particularly, to the supply of power to an amplifier circuit for a video signal.

[0002]

2. Description of the Related Art Conventionally, in an intercom system such as an apartment house, an image control device or the like selects a video signal photographed by a camera installed in a plurality of entrance intercoms and amplifies the selected video signal. Output was to the transmission line to the monitor installed in the intercom of each dwelling unit. Also, when transmitting a video signal to a monitor installed in the intercom of each dwelling unit at a place far away from the video control device, since attenuation on the transmission line becomes large, a video amplifier is provided in the middle and the video control device The transmitted video signal was amplified and output to a transmission line to a monitor installed in the intercom of each dwelling unit.

[0003]

In the conventional intercom system, the video signal amplifying circuit in the video amplifier is always powered on even when there is no video signal input, so that even when the intercom is not used. However, there is a problem that power is always consumed.

The present invention has been made to solve such a problem, and detects an input video signal and turns off the power of an amplifier circuit when there is no input of a video signal, so that an interphone can be used. It is an object of the present invention to provide an intercom system capable of suppressing power consumption when not in use.

[0005]

According to a first aspect of the present invention, there is provided an intercom system comprising a plurality of entrance intercoms each having a camera, and a plurality of monitors provided in each dwelling unit, each displaying a picture taken by the camera. In an intercom system with an intercom, a video signal input to a video signal amplifying unit that amplifies a video signal of a video captured by a camera is detected, and only when a video signal is detected, the video signal is amplified. Means for supplying a power supply.

[0006] An intercom system according to a second aspect of the present invention includes a collective entrance intercom provided with a camera, and a plurality of intercoms provided in each dwelling unit and provided with a monitor for displaying an image captured by the camera. In the intercom system, a modulated video signal that is input to a video signal amplification unit that amplifies a video signal of a video captured by a camera is input, and the input video signal is detected.
It has a detector for detecting an input of a video signal based on the detected signal, and a power switch for supplying power to the video signal amplifier only when the input of the video signal is detected by the detector.

[0007]

FIG. 1 is a block diagram showing the configuration of an intercom system according to one embodiment of the present invention. In the figure, reference numeral 10 denotes a camera installed in a collective entrance intercom or the like, 11 denotes a video control device for controlling video related to the intercom system, 12 denotes a distributor for distributing video signals, and 13 denotes a transmission line for transmitting video signals. , 14
Is an intercom installed in each dwelling unit, 15 is a monitor used together with the intercom 14, 16 is a video adapter connected to the monitor 15 and splitting the video signal transmitted on the transmission line 13 to the monitor 15, 17 is an interphone A call control device 18 that controls the communication of the system and controls the video control device 11 is a video amplifier that amplifies the video signal output from the video control device 11 and outputs it to the transmission line to the monitor 15 of each dwelling unit. And 19 are video signal detecting means for detecting the input of a video signal in the video amplifier 18 and controlling the supply of power to the amplifier circuit in the video amplifier 18.

Here, the video amplifier 18 amplifies a video signal transmitted from the video control device 11 through the long-distance transmission line 13 to a level output from the video control device 11, and for example, as shown in FIG. In this case, the level of the video signal output from the video control device 11 to the transmission line 13 (A in FIG. 1)
And the level of the video signal output from the video amplifier 18 to the transmission line 13 (point B in FIG. 1) is amplified.

First, the operation of the intercom system according to the present embodiment will be described. First, when a visitor operates a collective entrance intercom (not shown) to enter a room number to be visited at the entrance of an apartment house or the like, and then presses a call switch, the room code is transmitted from the collective entrance intercom to the call control device 17. A call signal including a call code is transmitted. And the call control device 17
When a call signal is received from the collective entrance intercom, the communication path between the collective entrance intercom and the target intercom 14 is established so that the collective intercom that transmitted the call signal and the interphone 14 of the room number to be called can communicate with each other.

When the collective intercom is operated, the camera 10 installed in the collective intercom, which is not shown, is supplied with power from the video control device 11 in accordance with an instruction from the call control device 17, and the camera 10 The operator shoots an image and sends the image signal to the image control device 11.
Send to Then, the video signal is transmitted to the video control device 11.
Is output to the transmission line 13 and is called, and the called intercom 14 is connected to the monitor 15
The video signal transmitted through the transmission line 13 is branched, and the video taken by the camera is displayed on the monitor 15 by controlling the video adapter 16 connected to.

Next, the operation of the video signal detecting means 19 in the intercom system of this embodiment will be described. First, when an intercom is not used in the intercom system, the video signal captured by the camera 10 from the video control device 11 is not output to the transmission line 13. Does not detect a video signal, and stops supplying power to the amplifier circuit in the video amplifier 18. Then, when the collective entrance intercom is operated, the transmission line 1 from the video control device 11 to the interphone to which the intercom is called is called.
3. For example, a video signal captured by the camera 10 is output to a transmission line between the video control device 11 and the video amplifier 18.

When a video signal is output from the video control device 11, the video signal detecting means 19 detects the video signal and starts supplying power to an amplifier circuit in the video amplifier 18, and the input video signal is output. The signal is amplified and output. As described above, when the video signal is not input, the video amplifier 18
In this case, only the power for detecting the video signal is consumed, and it is possible to suppress the power consumption when the intercom system is not used.

Next, a specific example of the video signal detecting means 19 will be described. FIG. 2 is a block diagram showing an example of the configuration of the video amplifier 18 provided with the video signal detecting means 19, and FIG. 3 is a diagram showing the configuration of a detector in the video signal detecting means 19.
In the figure, reference numeral 20 denotes a preamplifier for amplifying a video signal input into the video amplifier 18 to a certain level, for example, a level at which the presence or absence of a video signal can be detected. Reference numeral 23 denotes a video signal output from the preamplifier 20 on a monitor 15 of each dwelling unit. Is an amplifying circuit that amplifies the video signal to a level necessary for displaying the video signal.

An output signal of the amplifier 20 is input to a reference numeral 21.
A detector 22 for detecting the signal is a power switch for controlling the supply of power to the amplifier circuit 23 in the video amplifier 18 based on the detection result of the detector 21.
And the power switch 22 constitute the video signal detecting means 19. 30 is a resonance filter, 31 is a rectifier, 3
2 is an integrating circuit, and 33 is a comparator.

Next, the operation of the video signal detecting means 19 of this embodiment will be described. First, here, the video signal output from the video control device 11 is modulated and output, and the video signal is amplified by the preamplifier 20.
It is input to the detector 21. Then, in the detector 21,
A signal around the carrier frequency modulating the video signal by the resonance filter 30 is taken out, rectified by the rectifier 31, the signal is integrated by the integration circuit 32, the value of the output signal of the integration circuit 32 and the video signal Is compared with the value set as the value at the time of input, and if it is determined that the video signal has been input as a result of the comparison, a power ON signal is output to the power switch 22 and, conversely, the video signal is input. If it is determined that there is no power, the power switch 22
Outputs F signal.

In the power switch 22, the detector 2
Amplifying circuit 2 based on a power ON / OFF signal from
By controlling the supply of power to the power supply 3, when no video signal is output from the video control device 11, the amplification circuit 2
Then, the supply of power to the amplifier circuit 23 is started only when the video controller 11 stops outputting the video signal. The amplifying circuit 23 performs an amplifying operation by receiving power supply.

In this embodiment, when there is no need to amplify a video signal, such as when there is no video signal input, the supply of power to the amplifier circuit is stopped. Therefore, no intercom is used. It is possible to reduce power consumption when it is not necessary to display a video signal on a monitor.

In this embodiment, the detection of the video signal by the detector 21 is performed by the output signal of the amplifier 20. However, if the detection of the video signal can be performed only by the video signal from the video control device 11, the detection can be directly performed. A video signal from the video control device 11 may be input to detect the video signal. Further, in this embodiment, the video signal is detected by detecting the modulated video signal with a detector. However, when an unmodulated video signal is input, the video signal is directly detected. It may be. The video signal detecting means may have any configuration as long as it detects a video signal and controls the power supply of the amplifier circuit 23 based on the detection result.

In this embodiment, the video amplifier 1
8 is provided with a video signal detecting means 19, which is provided in the video control device 11, and when there is no video signal input from the camera 10, the supply of power to the internal amplifier circuit is stopped, and the intercom is used. The power consumption when not in use may be reduced, and the present invention is applicable to other devices as long as the device amplifies and outputs an input video signal.

[0020]

As described above, according to the present invention, a video signal input to a video signal amplifying unit for amplifying a video signal of a video captured by a camera is detected, and only when a video signal is detected. Since the power is supplied to the video signal amplifying unit, there is an effect that the power consumption can be suppressed when the intercom is not used and the video signal need not be displayed on the monitor.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an intercom system according to an embodiment of the present invention.

FIG. 2 is a block diagram illustrating an example of a configuration of a video signal detection unit 19;

FIG. 3 is a diagram showing a configuration of a detector in a video signal detecting means 19;

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 camera 11 video control device 12 distributor 13 transmission line 14 interphone 15 monitor 16 video adapter 17 call control device 18 video amplifier 19 video signal detection means 20 amplifier 21 detector 22 power switch 23 amplifier circuit 30 resonance filter 31 rectifier 32 integration circuit 33 Comparator

Continuation of front page (72) Inventor Takashi Toda 4-7-3 Kudanminami, Chiyoda-ku, Tokyo Nomi Disaster Prevention Co., Ltd. F term (reference) 5C054 AA02 AA05 BA03 CA04 CC03 CH02 DA08 ED00 FC03 FF03 HA22 5C087 AA09 AA24 AA25 AA37 AA44 BB03 DD05 DD26 EE10 FF01 FF04 FF08 FF24 GG31 GG54 GG67 GG69 5K038 AA01 CC12 DD09 DD15 DD23

Claims (2)

[Claims] 1. An intercom system comprising: a collective entrance intercom provided with a camera; and a plurality of intercoms provided in each dwelling unit and provided with monitors for displaying images taken by the camera. A video signal input to a video signal amplification unit that amplifies a video signal of a captured video is detected, and only when a video signal is detected, a unit that supplies power to the video signal amplification unit is provided. Intercom system. 2. An intercom system comprising: a collective entrance intercom provided with a camera; and a plurality of intercoms provided in each dwelling unit and provided with a monitor for displaying an image photographed by the camera. A modulated video signal that is input to the video signal amplifier that amplifies the video signal of the captured video is input, the input video signal is detected, and the input of the video signal is detected based on the detected signal. An intercom system comprising: a detector that performs power detection; and a power switch that supplies power to the video signal amplifying unit only when an input of a video signal is detected by the detector.