JPH03292086A - Video doorphone equipment - Google Patents

Abstract

PURPOSE:To reduce a wiring cost by providing plural camera doorphones and plural video signal controllers outputting a video signal selectively to a monitor television receiver based on a DC current separated from a synthesis signal inputted from each camera doorphone. CONSTITUTION:When a camera doorphone 24 is started attended with a starting current, the camera doorphone 24 outputs a synthesized signal resulting from superimposing a modulated video signal and a DC current to a video signal input terminal 42 of a video signal controller 40. The synthesized signal is separated to the video signal and the DC at the video signal controller. The separated DC is fed to a signal switching relay 45 to activate a relay contact 46 and to disconnect the connection between an output terminal 43 and an input terminal 41 and connects the output terminal 43 to a video signal input terminal 42. Thus, the video signal of the camera doorphone 24 is outputted to a coaxial cable line 30 and sends it to a monitor television receiver 29 via a branching filter 50 and a coaxial cable branch line 31 and the video image is displayed on the screen of the monitor television receiver 29.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention provides f! The present invention relates to a video door intercom device that can be recognized as a video door intercom device.

Conventional technology In recent years, from the viewpoint of protecting personal privacy and crime prevention, an increasing number of residences are installing door intercom devices equipped with cameras, or so-called video door intercom devices, at the entrance of the residence. Connected video door intercom devices are widespread. Additionally, due to recent changes in housing conditions, camera door phones (door phone handsets) are often installed in multiple locations within a residential unit.

Conventionally, with this type of video door intercom device, when calls are received from multiple camera door intercoms at the same time, it is common to respond by switching and selecting the desired camera intercom on the monitor TV (door intercom base unit) as appropriate. be.

Hereinafter, a conventional video door intercom device will be explained based on the drawings.

FIG. 3 is a block diagram showing a schematic configuration of a conventional video door intercom device.

In FIG. 3, l is a terminal box of a home telephone connected to the telephone line 2, and 3.4 is a first terminal box that outputs its ringing signal and voice output signal to the terminal box l via a telephone line 5.6. and a second camera doorbell;
7 is a home telephone that receives audio signals from the first and second camera door phones 3.4 via a call control line 8 whose one end is connected to the terminal box l.

Reference numeral 9 denotes a monitor television, which has two video signal input terminals for receiving video signals from the first and second camera door phones 3 and 4, and also has two video signal input terminals for receiving video signals from the first and second camera door phones 34.
The telephone 7 is activated based on a calling signal inputted to the telephone 7 from the telephone 7. 10 is a coaxial cable that transmits video signals from the first and second camera door phones 3 and 4.

Further, the monitor television 9 supplies a starting current to the first and second camera door phones 3.4 in a manner superimposed on the coaxial cable 10.

Next, the operation of the above conventional video door intercom device will be explained.

In FIG. 3, when a visitor presses the call button of the first camera door phone 3, a calling signal is output from the first camera door phone 3 to the terminal box 1, and based on this calling signal, the telephone 7 outputs a ringing tone. A call is established with the first camera door phone 3 by ringing and flashing the call lamp, and by off-hooking the handset of the telephone 7.

Further, the telephone 7 simultaneously activates the monitor television 9, and the activated monitor television 9 supplies a starting current to the first camera door phone 3 to activate it, and the camera door phone 3 is activated.
The image from is displayed on the screen of a monitor television 9.

If there is a call from the second camera door phone 4 while the monitor television 9 is outputting the video from the first camera door phone 3 as described above, the terminal box 1 will output the backtone of the call. When the telephone 7 responds, a telephone call with the second camera door intercom 4 is established.

At the same time, in response to a call from the second camera door phone 4,
The monitor television 9 uses its internal switching means to stop supplying the starting current to the first camera door phone 3, and also supplies the starting current to the second camera door phone 4 to display the video output on the screen. The video is switched to the video from the second camera door phone 4.

In contrast, the monitor television 9 is connected to the second camera door phone 4.
If there is a call from the first camera door phone 3 while the video from the second camera door phone 4 is being output, the video output from the monitor TV 9 remains as the video from the second camera door phone 4, and the puck tone of the call is output. Only the first camera on the doorbell 3
Send to.

Then, at the time of the on-footer operation of the handset as the call between the telephone 7 and the second camera door intercom 4 ends,
The internal switching means stops the supply of starting current to the second camera door phone 4, and supplies the starting current to the first camera door phone 3, so that the video output to the west side of the monitor television 9 can be output. The video is switched to the video from the first camera door phone 3.

As described above, switching is performed from the first camera door intercom 3 to the second camera door intercom 4 (or vice versa), and even with the conventional video door intercom device described above, it is possible to control a plurality of camera door intercoms 3 and 4. can.

Problems to be Solved by the Invention However, in the above-mentioned conventional video door intercom device, since the switching control of the plurality of camera door intercoms 3.4 is concentrated on the monitor television 9, the number of camera intercoms 3.4 is the same as the number of camera door intercoms 3.4. Coaxial cable 10 to one monitor TV 9
There was a problem in that the wiring work was complicated and the cost was high.

Furthermore, since the same number of coaxial cables 10 as the number of camera door phones 3.4 must be connected to one monitor TV 9, the number of camera door phones 3.4 that can be connected to one monitor TV 9 is There was a problem in that it was limited by the number of input terminals.

The present invention solves the above-mentioned conventional problems, and allows a camera door phone to be connected to a monitor TV using simple wiring using pseudo-bus wiring.Therefore, wiring costs can be reduced, and the video input It is an object of the present invention to provide a television door intercom device that can connect any number of camera intercoms to one monitor television regardless of the number of terminals.

Means for Solving the Problems In order to achieve the above object, the present invention provides a plurality of signals that are activated by the control of a terminal box connected to a line such as a telephone line and output a composite signal in which a direct current is superimposed on a video signal. Camera door phone and multiple video signal controls that separate the composite signal input from each camera door phone into a video signal and DC current, and selectively output the video signal to a monitor TV based on the separated DC current. The configuration includes a device.

Function The present invention allows the camera door phone to be connected to the monitor television by simple wiring using pseudo-bus wiring, thereby reducing the wiring cost.

In addition, since each video signal control device selectively outputs the video signal of each camera door phone to the monitor TV, any number of camera door phones can be connected to one monitor TV regardless of the number of video input terminals. be able to.

Example Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a block diagram schematically showing a video door intercom device according to an embodiment of the present invention.

In FIG. 1, 21 is a terminal box of a home telephone connected to a telephone line 22, 23 is a path line for transmitting signals input to and output from the terminal box 21, and 24 is a path line 25 connected to a telephone line 25.
A plurality of camera door intercoms are connected to each other and output the calling signal and audio output signal to the terminal box 21 and a telephone 27 to be described later.

Furthermore, a control signal for the camera door phone 24 outputted from the terminal box 21 to the path line 23 and a starting current superimposed on this control signal are sent to each of the camera door phones 24 from the path line 23 to each camera. A control line 26 for transmitting to a doorbell 24 is connected.

27 is a plurality of home telephones, 28
is a call line, and each telephone 27 has a call line 25.
, a call signal and an audio output signal from each camera door phone 24 are inputted via the path line 23 and the call line 28 .

A plurality of monitor televisions 29 are provided in pairs with each telephone 27, and are provided with one video signal input terminal.

30 is a coaxial cable main line for transmitting video signals from the first to third camera door phones 24 to the monitor television 29; 31 is a main coaxial cable line between each camera door phone 24 and the coaxial cable main line 30; It is a coaxial cable branch line for connecting between and the monitor television 29,
Upon activation, each camera door phone 24 outputs to the coaxial cable branch line 31 a composite signal in which a direct current for controlling a video signal control device 40 (described later) is superimposed on a video signal.

At each connection point between the coaxial cable main line 30 and the coaxial cable branch line 31 from each camera door phone 23, a video signal from each camera door phone 23 is selectively connected to the coaxial cable! A video signal control device 40 is provided which outputs the video signal to the 1I30 and transmits it to the monitor television 29.

On the other hand, each connection point between the coaxial cable 30 and the coaxial cable branch line 31 to each monitor television 29 is operated by being supplied with power from the monitor television 29, and the camera door phone 24
A branching device 50 is provided to branch the video signal from the video signal at high impedance, and by performing the branching at high impedance, branching loss unlike branching by a general hybrid transformer does not occur. 6
0 is a terminating resistor of the coaxial cable main line 30.

FIG. 2 is a circuit diagram showing essential parts of the video signal control device 40 in FIG. 1.

In FIG. 2, 41 is an input terminal into which a signal from the coaxial cable main line 30 is input, and 42 is a camera door phone 24.
A video signal input terminal 43 to which the combined signal from the coaxial cable branch line 31 connected to is input is an output terminal that outputs the signal input to the video signal control device 40 to the coaxial cable main line 30.

44 is an orthogonal separation circuit that separates the composite signal inputted from the video signal input terminal 42 into a video signal and a direct current superimposed thereon; 45 is an orthogonal separation circuit obtained by separating the composite signal by the orthogonal separation circuit 44; A signal switching relay operated by direct current, 46 is a relay contact.

This relay contact 46 connects the input terminal 41 and the output terminal 43 in a normal break state, and connects the video signal input terminal 42 and the output terminal 43 in a make state in which DC current is supplied to the signal switching relay 45. With the simple authority of the orthogonal separation circuit 44 and the signal switching relay 45, the video signals from each camera intercom 23 can be selectively sent to the monitor television 29.

Next, the operation of the video door intercom device of the present invention having the above configuration will be explained.

In FIG. 1, when a visitor presses the call button of the camera door phone 24, a call signal is output from the camera door phone 24 to the terminal box 21, and based on this call signal, the terminal box 21 sends a control signal for the camera door phone 24. and the starting current superimposed on this control signal,
The signal is output to the camera intercom 24 via the pass line 23 and the control line 26.

When the camera door phone 24 is activated in response to this starting current, the video signal modulated by the camera door phone 24 is transmitted to the video signal control device 40 via a coaxial cable branch line 31 and a tc signal, which is a combination of signal and DC current, is transmitted to the video signal control device 40 via the coaxial cable branch line 31. It is output to the signal input terminal 42. The sum ti input to the video signal input terminal 42,
The signal is separated into a video signal and a direct current by an orthogonal separation circuit 44.

The separated DC current is supplied to the signal switching relay 45 to activate the relay contact 46, and when the relay contact 46 falls from the break side to the make side, the connection between the output terminal 43 and the input terminal 41 is disconnected and output is generated. The terminal 43 is connected to the video signal input terminal 42.

As a result, the video signal of the camera door phone 24 that has been operated to be called is output to the coaxial cable main line 30 and transmitted to the monitor television 29 via the branch 50 and the coaxial cable branch line 31, and the video signal of the camera door phone 24 that has been operated to be called is displayed on the screen of the monitor television 29. On the other hand, when the camera door phone 24 starts up, a call is made from the camera door phone 24. 2
A calling signal is transmitted to telephone 7, and this calling signal causes telephone 2 to
7 sounds a ringing tone and flashes a calling lamp, and establishes a call with the camera door phone 24 by off-footer operation of the handset of the telephone 27.

In this way, each video signal control device 40 has the authority to selectively output a video signal to the coaxial cable main line 30 only when there is a call from the camera door phone 24.
In reality, as shown in Fig. 1, a plurality of camera door phones 24 were connected in parallel on a single coaxial cable 4130 via a video signal control device 40, and a call operation was performed by the visitor. Only the video signal of the camera door phone 24 is transmitted to the monitor television 29.

Effects of the Invention As described above, according to the present invention, a plurality of camera door phones that are activated by the control of a terminal box connected to a line such as a telephone line and output a composite signal in which a direct current is superimposed on a video signal; An authority equipped with a plurality of video signal control devices that separate a composite signal manually input from a camera door phone into a video signal and a direct current, and selectively output the video signal to a monitor television based on the separated direct current. Therefore, the camera door phone can be connected to the monitor TV using simple wiring using pseudo bus wiring.
Therefore, wiring costs can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a general outline of a video door intercom device according to an embodiment of the present invention, FIG. 2 is a circuit diagram showing main parts of the video signal control device in FIG. 1, and FIG. 3 is a conventional video door intercom device. FIG. 2 is a block diagram schematically showing the authority of the device. 21...Terminal box, 22...
・Telephone line, 24...Camera door phone, 29・
...Monitor television, 40...Video signal control device.

Claims (1)

[Claims] A plurality of camera intercoms are activated under the control of a terminal box connected to a telephone line or other line to output a composite signal in which a direct current is superimposed on a video signal, and the composite signal input from each camera intercom is converted into a video signal. 1. A video door intercom device comprising a plurality of video signal control devices that separate the video signal into a direct current and selectively output the video signal to a monitor television based on the separated direct current.