JPH0534759U - Cordless tv intercom device - Google Patents

Abstract

(57) [Summary] [Purpose] In a TV doorphone system consisting of a camera door phone slave unit, a monitor TV master unit, and a sub master unit, the TV monitor sub master unit can be installed anywhere without wiring to the monitor TV master unit. To do so. [Structure] The TV monitor master unit 2 is connected to the camera intercom slave unit 1 by a cable and outputs a video signal.
A circuit 6 for A / D converting the video signal, a circuit 7 for storing the digitized video signal in the memory 8, a circuit 9 for modulating the stored video signal into an audio band, and a circuit 10 for wirelessly transmitting the video signal. The television monitor sub-base unit 3 includes circuits 11 and 12 that receive and demodulate the video signal sent from the television monitor base unit 2, a circuit 13 that stores the demodulated video signal in the memory 14, D the stored video signal
And A / A-converted and outputting as a composite video signal.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a cordless TV door phone device used in a detached house, an apartment house, or the like.

[0002]

[Prior Art]

 Conventionally, a TV intercom system used in a detached house or an apartment house is composed of a camera intercom slave unit, a monitor TV master unit, and a sub master unit, and each device is wired by a coaxial cable.

[0003]

[Problems to be solved by the device]

 However, with the recent development of signal multiplexing technology, even in the above-mentioned conventional TV doorphone system, the wiring between the camera doorphone slave unit and the monitor TV master unit can be connected using the existing intercom cable (2-wire). Existing cables can now be used. On the other hand, the connection between the monitor TV main unit and the sub-main unit, or between the main unit and the general TV requires the conventional wiring using a coaxial cable, which makes wiring in an existing house difficult.

The present invention solves such a conventional problem, and the image on the monitor TV sub-base unit or general TV becomes a still image, but it is free place without wiring with the monitor TV base unit. It is an object of the present invention to provide an excellent cordless TV intercom device that can be installed in

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention uses a low-power cordless system for video signal transmission from a monitor TV master unit to a monitor TV sub-master unit or a general TV, and sets the band of the video signal to an audio band. The video to be transmitted is a still image (TTC standard), the monitor TV base unit is equipped with an A / D conversion circuit, memory, data modulation circuit, RF transmission circuit, etc., and the monitor TV sub-base unit is equipped with an RF reception circuit, data demodulation circuit, By providing a memory and a D / A conversion circuit, etc., a cordless TV intercom is realized.

[0006]

[Action]

 Therefore, according to the present invention, it is possible to install the monitor TV sub-master unit in a free place and display the image (still image) of the camera doorphone on the general TV without wiring from the monitor TV master unit. Also, by combining it with a cordless telephone, it will be possible to provide even more flexibility in dealing with visitors.

[0007]

【Example】

 FIG. 1 shows the configuration of an embodiment of the present invention. In FIG. 1, 1 is a camera intercom slave, 2 is a monitor TV master, and 3 is a monitor TV sub-master.

In the monitor television base unit 2, 4 is a video processing circuit for processing a video signal from the camera of the camera intercom slave 1, and 5 is a display for displaying a video based on the video signal processed by the video processing circuit 4. The device is a CRT display, 6 is an A / D conversion circuit for analog / digital conversion of the video signal processed by the video processing circuit 4, and 7 is an image for storing and reading the digitized video signal in the memory 8. A control circuit, 9 is an amplitude / phase modulation circuit for modulating the video signal read from the memory 8 into a TTC standard audio band, and 10 is an RF transmission circuit for transmitting the modulation signal by a low power radio wave.

In the monitor television sub-base unit 3, 11 is a low-power RF receiving circuit for receiving the video signal sent from the monitor television base unit 2, and 12 is an amplitude phase for demodulating the received radio wave. A demodulation circuit, 13 is a video control circuit for storing and reading the demodulated video signal in the memory 14, and 15 is a D / A conversion circuit for digital-to-analog converting the video signal read from the memory 14, 16 Is a video processing circuit for outputting an analog video signal as a composite video signal to a video, and 17 is a general television with a video input terminal connected to the video output terminal of the monitor television sub-master unit 2. A CRT display for displaying an image may be provided inside the television monitor sub-base unit 2.

Next, the operation of the above embodiment will be described. In the above-described embodiment, the image captured by the camera of the camera door phone 1 is processed by the image processing circuit 4 and displayed on the CRT display 5, and the image signal is digitized by the A / D conversion circuit 6 to obtain the image control circuit. 7 to store in the memory 8. Next, the data stored in the memory 8 is sequentially read out, modulated into a voice band by an amplitude phase modulation circuit (TTC standard) 9, and transmitted by a low power radio wave by an RF transmission circuit 10.

On the other hand, when the radio wave transmitted from the monitor television base unit 2 is received by the RF receiving circuit 11 of the monitor television sub-base unit 3, the received signal is demodulated by the amplitude / phase demodulation circuit 12, and the demodulated video is obtained. The signal is stored in the memory 14 by the video control circuit 13, the stored data is sequentially read out, converted into an analog video signal by the D / A conversion circuit 15, and converted into a composite video signal by the video processing circuit 16 to be converted into a video. Output to the output terminal. By connecting a general television (with a video input terminal) 17 to this video output terminal, a still image captured by the camera intercom slave 1 can be displayed on the general television 17.

Although not described in the above embodiment, the audio signal from the camera intercom slave 1 is A / D converted in the monitor television master unit 2 in the same manner and then multiplexed and modulated with the video signal. It is sent out wirelessly, demodulated by the monitor television sub-base unit 3, D / A converted, and then output from the speaker. At this time, a low-power RF transceiver may be provided between the camera doorphone slave unit 1 and the monitor television master unit 2 to wirelessly transmit and receive an audio signal.

[0013]

[Effect of the device]

 As is apparent from the above embodiment, the present invention makes it possible to freely select the installation location of the sub-master unit by making the monitor television master unit and the sub-master unit cordless. It also has the advantage that it can be easily connected as a cordless adapter when displaying images from a camera door phone on a general television. Furthermore, the system up with the cordless phone has the effect of allowing the cordless phone to talk to the doorphone and building a TV doorphone system that allows you to watch the visitors' images on the TV and is not restricted to where you are.

[Brief description of drawings]

FIG. 1 is a schematic block diagram of an image section of a cordless television door phone apparatus according to an embodiment of the present invention.

[Explanation of symbols]

 1 Camera doorphone slave unit 2 Monitor TV master unit 3 Monitor TV sub master unit 4 Video processing circuit 5 CRT display 6 A / D conversion circuit 7 Video control circuit 8 Memory 9 Amplitude / phase modulation circuit (TTC standard) 10 Low power RF transmission Circuit 11 Low-power RF receiving circuit 12 Amplitude / phase demodulation circuit 13 Video control circuit 14 Memory 15 D / A conversion circuit 16 Video processing circuit 17 General television (with video input terminal)

Claims (2)

[Scope of utility model registration request] 1. A cordless TV intercom device in which a camera intercom slave unit and a monitor TV master unit are connected by wire, and a monitor TV master unit and a monitor TV sub-master unit are connected by a low power type wireless voice band. 2. A television monitor master unit is connected to a camera intercom slave unit and outputs a video signal, a unit for A / D converting the video signal and storing it in a memory, and the stored video signal. A means for demodulating and receiving the video signal sent from the TV monitor master unit by the TV monitor sub-master device, and a means for transmitting the demodulated video signal to a memory. 2. The cordless television doorphone device according to claim 1, further comprising: a storage unit and a unit that D / A converts the stored video signal and outputs the composite video signal.