JPH0714770U - Expansion monitor TV unit - Google Patents

Abstract

(57) [Summary] [Purpose] To provide an extension monitor TV unit that requires only one system of wiring work for extension. [Structure] In an extension monitor TV unit 15 used in a TV monitor system including a plurality of TV cameras (not shown) and a plurality of monitor TV units 10 and 15, audio from an attached microphone (not shown) A transmission modulation circuit 11 that modulates a signal and a reception demodulation circuit 12 that demodulates an audio signal from an attached microphone (not shown) of a television camera (not shown) are provided, and a transmission method with the parent monitor TV unit 10 will be described. In common with the transmission method between the parent monitor TV unit 10 and the TV camera (not shown),
It has a configuration of a multiplex transmission system for simultaneously transmitting a video signal and an audio signal.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention comprises a plurality of TV cameras and a plurality of monitor TV units, which are used for displaying and confirming the image of a visitor captured by a TV camera installed at the entrance etc. in the house. The improvement of the monitor television unit for expansion of the new TV monitor system.

[0002]

[Prior art]

 FIG. 2 is a block diagram showing a configuration example of a main part of an example of a television monitor system using a conventional extension monitor television unit. In the figure, 51 is a balancing circuit for impedance matching, 52 is a camera power supply, 53 is a transmission modulation circuit that modulates an audio signal from a microphone (not shown) of the intercom system 63, and 54 is a television camera (not shown). A reception demodulation circuit that demodulates the audio signal from the attached microphone (in the figure), 55 is a video signal reception circuit that separates the video signal from the transmission signal from the TV camera (not shown), and 56 is an image for the extension monitor TV unit 62. An extension video signal amplifier that amplifies a video signal to send a signal, and 57 is an extension that receives the start signal of the television camera from the start signal transmission circuit 61 of the extension monitor TV unit 62 and drives the camera power supply 52. Start signal detecting circuit for use, 58 is a 2-wire / 4-wire converting circuit for converting 2-wire / 4-wire for connection with the intercom system 63. 59 is a parent monitor television unit.

Reference numeral 60 is a video signal receiving circuit of the extension monitor TV unit 62 that receives a video signal from the extension video signal amplifier 56 and projects an image on a display screen such as a cathode ray tube, and 64 is an extension monitor TV unit. 62 is an extension intercom attached to 62, 65 is a video signal line connecting the parent monitor TV unit 59 and the extension monitor TV unit 62, 66 is an audio signal connecting the intercom system 63 and the extension intercom 64 It is a line.

In the television monitor system having such a configuration, the addition start signal detection circuit 57 receives the activation signal of the television camera from the activation signal transmission circuit 61 of the extension monitor television unit 62, and the camera power supply 52 is turned on. Since it is driven, it is possible to monitor from the additional monitor TV unit 62 regardless of whether the parent monitor TV unit 59 is operating or not.

Although a video signal and an audio signal are transmitted between a television camera (not shown) and the parent monitor television unit 59 through a common multiplex transmission line, in the parent monitor television unit 59, The video signal and the audio signal are separated.

[0006]

[Problems to be solved by the device]

 Therefore, when connecting the extension monitor TV unit 62 to the parent monitor TV unit 59, it is necessary to perform wiring work for two systems of the video signal line 65 and the audio signal line 66. Further, as described above, the parent monitor TV unit 59 has different input signal lines from the multiplex transmission line of the video signal and the audio signal, and the extension monitor TV unit 62 has different input signal lines from the video signal line 65 and the audio signal line 66. The circuit configurations of the extension monitor TV unit 62 and the parent monitor TV unit 59 are completely different, and there was a lot of waste in assembly and manufacturing.

The present invention has been devised in view of the above circumstances. In the first invention, a monitor television unit for expansion, which requires only one wiring work for expansion, is used in the second invention. It is an object of the present invention to provide an additional monitor TV unit that can be manufactured and assembled in the same process as the monitor TV unit.

[0008]

[Means for Solving the Problems]

 An extension monitor TV unit according to the present invention, which is proposed to achieve the above object, is used in a TV monitor system comprising a plurality of TV cameras and a plurality of monitor TV units. The additional monitor TV unit is equipped with a transmission modulation circuit that modulates the audio signal from the attached microphone and a reception demodulation circuit that demodulates the audio signal from the attached microphone of the TV camera. The transmission method is a multiple transmission method that simultaneously transmits video and audio signals, which is the same as the transmission method between the parent monitor TV unit and the TV camera.

According to a second aspect of the present invention, there is provided an extension monitor television unit according to the first aspect, which includes the transmission modulation circuit, the reception demodulation circuit, and the video signal reception circuit as a parent monitor television unit. The transmission modulation circuit, reception demodulation circuit, and video signal reception circuit have substantially the same circuit configuration.

[0010]

[Action]

 The monitor television unit for expansion according to the present invention as set forth in claim 1 comprises a transmission modulation circuit for modulating a voice signal from an attached microphone and a reception demodulation circuit for demodulating a voice signal from an attached microphone of the television camera. Since the transmission method with the parent monitor TV unit is the same as the transmission method with this parent monitor TV unit and the TV camera, the multiple transmission method that simultaneously transmits the video signal and the audio signal is used. Wiring work can be done, and expansion work becomes easy.

In the monitor television unit for expansion according to the present invention as set forth in claim 2, the transmission modulation circuit, the reception demodulation circuit, and the video signal reception circuit are the transmission modulation circuit of the parent monitor television unit and the reception demodulation circuit. Since the circuit configuration is almost the same as that of the video signal receiving circuit, it is possible to manufacture and assemble with substantially the same parts and process as the parent monitor TV unit, which can be useful for reducing manufacturing cost.

[0012]

【Example】

 Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a block diagram showing a configuration example of a main part of an embodiment of a television monitor system using an extension monitor television unit according to the present invention. In the same manner as the conventional example, the same reference numerals are given and described. Is omitted. In the figure, 10 is a parent monitor TV unit in which the extension video signal amplifier 56 and the 2-wire to 4-wire conversion circuit 58 are omitted from the parent monitor TV unit 59 of the conventional example, and 11 is a microphone (not shown). A transmission modulation circuit of the extension monitor TV unit 15 that modulates a voice signal, a reference numeral 12 of a reception demodulation circuit of the extension monitor television unit 15 that demodulates a voice signal from an attached microphone of a television camera (not shown), and a reference numeral 13 of a television camera. Video signal receiving circuit of the additional monitor TV unit 15 for separating the video signal from the transmission signal from (not shown), 14 is a start signal sending circuit of the additional monitor TV unit 15, and 16 is a TV camera and video and audio signals Is a multiplex transmission line through which multiplex transmission is performed.

In the television monitor system having such a configuration, since the extension monitor television unit 15 is connected to the parent monitor television unit 10 by the multiplex transmission line 16 and one system, one system of wiring work is required at the time of extension. Although it can be completed with, and the expansion work is easy, the operation is no different from the conventional one. A block diagram showing a configuration example of a main part of an embodiment of a television monitor system using the extension monitor television unit according to claim 2 is substantially the same as that of FIG. The transmission modulation circuit 11 is the transmission modulation circuit 53 of the parent monitor TV unit 10, the reception demodulation circuit 12 of the extension monitor TV unit 15 is the reception demodulation circuit 54 of the parent monitor TV unit 10, and the extension monitor TV. The video signal receiving circuit 13 of the unit 15 and the video signal receiving circuit 55 of the parent monitor television unit 10 are substantially the same in configuration.

By doing so, the additional monitor TV unit can be manufactured and assembled by substantially the same parts and processes as the parent monitor TV unit, and the manufacturing cost can be reduced. In the above-mentioned two embodiments, the television camera and the additional monitor television unit are described as being directed to one, respectively, but it goes without saying that a plurality of television cameras and additional monitor television units can be similarly implemented.

[0015]

[Effect of device]

 According to the monitor television unit for expansion according to the present invention as defined in claim 1, it is possible to complete the wiring work for one system when the expansion is performed, and the expansion work is simplified. According to the extension monitor TV unit according to the present invention as set forth in claim 2, in addition to the effect of the extension monitor TV unit as set forth in claim 1, the manufacture and assembling can be performed with substantially the same parts and processes as the parent monitor television unit. , Can be used to reduce manufacturing costs.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration example of a main part of an embodiment of a television monitor system using an extension monitor television unit according to the present invention according to claim 1.

FIG. 2 is a block diagram showing a configuration example of a main part of an example of a television monitor system using a conventional extension monitor television unit.

[Explanation of symbols]

 10 ... Parent monitor TV unit 11 ... Transmission modulation circuit 12 ... Reception demodulation circuit 13 ... Video signal reception circuit 15 ... Expansion monitor TV unit 16 ... Multiplex transmission line

Claims (2)

[Scope of utility model registration request] 1. An extension monitor TV unit used in a TV monitor system comprising a plurality of TV cameras and a plurality of monitor TV units, and a transmission modulation circuit for modulating an audio signal from an attached microphone,
The receiver and demodulator circuit that demodulates the audio signal from the microphone attached to the TV camera, and the transmission method with the parent monitor TV unit is the same as the transmission method between the parent monitor TV unit and the TV camera. An extension monitor TV unit characterized by a multiplex transmission system that simultaneously transmits data. 2. The transmission modulation circuit according to claim 1,
An extension monitor television characterized in that the reception demodulation circuit and the video signal reception circuit have substantially the same circuit configurations as the transmission modulation circuit of the parent monitor TV unit, the reception demodulation circuit, and the video signal reception circuit, respectively. unit.