JPS5857030B2 - TV intercom houshiki - Google Patents

Description

[Detailed description of the invention] The present invention relates to a television intercom system.

In recent years, many high-rise condominiums and apartments have been constructed, but for residents and visitors of such high-rise buildings, there are
Telephones dedicated to residents' calls, so-called intercoms, installed at floor entrances, etc., are extremely convenient, and the demand for them is expected to increase in the future.

In this case, it is often more convenient for residents to be able to monitor a person attempting to make a connected call at the entrance on the first floor, in order to prevent pushy sales and other aspects.

At present, an intercom device capable of video monitoring may be realized by a videophone, but it is still expensive and has not been put into practical use.

An object of the present invention is to provide an intercom device capable of image monitoring at a relatively low cost by using television receivers and other facilities existing at home.

The drawings will be explained in detail below.

The figure is a block diagram of an embodiment of the invention.

(In this figure, the television signal from the communal antenna ANT passes through the r-wave unit FA, the hybrid coupler HYI, and the line to a plurality of first terminal devices 5F1SF2SF3, etc. installed in each resident's home. etc. will be distributed.

The second terminal device ST is installed, for example, at the entrance of the collective housing where each of the above-mentioned residents lives, and includes a television camera TC and a television intercom panel P.

This television intercom panel P is a telephone, and is equipped with a handset, a dial, etc., and the telephone number of each resident is written on its front panel.

A telephone device such as the first terminal device SFl, and a television.
Intercom panel P is housed in telephone exchange EX.

A visitor to a resident in the above-mentioned housing complex should, for example, pick up the receiver of the TV intercom panel P of the second terminal device ST installed at the entrance, check the dial tone, and then approach the TV intercom.・Dial the telephone number of the destination listed on Panel P.

As a result, the exchange EX operates and is connected to the telephone device of the visited resident's terminal device, eg, SF1, and a calling signal is sent.

On the other hand, when the handset of the TV intercom panel P is picked up, the TV camera TC is activated, thereby sending the video signal of the visitor operating the second terminal device ST to the modulator M. First terminal device S F t...
. . . modulates a carrier wave from a carrier wave generator O corresponding to one of the channels to which the television receiver TV can be tuned and received.

In this embodiment, this modulated wave is attenuated by an attenuator ATT to a level so low that it cannot be received by the television receiver, and noise is eliminated through a bandpass P-wave device FB that passes only this modulated wave. After that, the signal is inputted to the above-mentioned line, which is a transmission means provided for distributing the television signal to the television receiver TV in the first terminal device installed in the resident's house, via the hybrid coupler HY1. be done.

The carrier wave generated from the carrier wave generator O corresponds to a channel that can be tuned and received by the television receiver TV, but is not used in broadcast television.

The wave wave device FA is a wave wave device that blocks the frequency band of a specific channel used in this television intercom system in order to prevent noise from entering from the antenna ANT.

At this time, assume that SF is called as the first terminal device, for example.

When receiving a general call, the ringing signal is sent for 1 second and paused for 2 seconds. However, when receiving a call from the second terminal ST, a ringing signal is sent in a format different from the above, for example, 0.4 seconds. A type of transmission with a pause of 0.2 seconds is used to distinguish between the two.

The called party can audibly identify the TV intercom call by the telephone ringing at a different frequency than normal calls, and then turn on the TV receiver and listen to the TV/Intercom call.
Tune to a specific channel used in the intercom system.

On the other hand, when there is an incoming call on the telephone device, the ringing current flows through the rectifier RF.
C, half-wave rectification is performed and the reed relay R operates intermittently.

In accordance with this, contact r is turned on and off, and by counting the number of times relay R is turned on and off within a certain period of time, a detector can identify whether an incoming call is an incoming call from the television intercom panel P or not.

If there is an incoming call from the TV intercom panel P, the amplifier AMP is activated, the band corresponding to the above-mentioned specific channel selected by the P waver FC is amplified to a level that can be received by the TV TV, and the hybrid coupler HY2 is activated. After that, TV TV
give to

The called party can monitor the image of the caller (visitor) by tuning the television receiver TV to the above-mentioned specific channel.

Here, if the called party picks up the handset of the terminal device SF1, he or she can talk to the caller (visitor □□□).

First terminal device SF1 installed in each resident's home...
. . . are housed in the telephone exchange EX and can be used for ordinary calls with other subscribers other than those for the television intercom.

In this case, the exchange EX can be a general horse exchange system, a private branch exchange system installed jointly with residents of collective housing (including those who do not subscribe to this TV intercom system), or a subscriber line concentrator (one unit). (including those that can be connected within this concentrator) can be used between subscribers accommodated in a line concentrator, without going through a master station.

Incidentally, it is easily possible to send a different ringing signal to an incoming call from a specific subscriber than to an incoming call from a general subscriber.

The television receiver TV is also used for receiving broadcast television,
This can only be used when calling from a TV intercom.

In the above embodiment, the video monitor signal is sent to each terminal device S.
FI, SF2. etc., but the image is at a low level and cannot be received as it is, but the intensifier MP is activated only in the called terminal device, for example SFt, and the intensifier MP is distributed to other terminal devices. Since the device AMP is inactive, the video monitor signal cannot be received by anyone other than the called party, thus maintaining the confidentiality of the communication. In addition to the above, there are various ways to stop the vehicle.

For example, to each TV receiver TV, a wave wave device that passes the band of the specific channel and a wave wave device that blocks it are connected in parallel, and the path passing through the wave wave device is opened and closed based on the identification result of the calling signal. It is also possible by such means.

While the video is being monitored, anyone other than the called party is not disturbed and can view broadcast television using the antenna ANT.

In the above embodiment, a wired line was used to distribute the television signal to each television receiver, but it is also possible to construct this transmission line wirelessly.

As described above, the present invention has the advantage that it can provide a television intercom system at a relatively low cost that allows video of visitors to be monitored using an existing broadcast television receiver, an existing telephone, or the like.

That is, the present invention enables effective use of transmission lines (telephone lines, television antenna lead-in lines, etc.) wired in collective housing such as condominiums or apartments.

Ability to effectively use a home television receiver.

There is no need to make extensive modifications to the exchange equipment, such as adding a video signal transmission link and its control function.The cost per subscriber in a group housing is low.

It has the following advantages.

[Brief explanation of drawings]

The figure is a block diagram of Embodiment 0 of the present invention. In the figure, TV is a television receiver, TV is a telephone,
, SF2. SF3. ...... is the first terminal device, T
C is the TV camera 1, P is the TV intercom panel, ST is the second terminal device, L is the line (transmission means),
M is the modulator, EX is the telephone exchange, ANT is the antenna, H
Y, HY2 is a hybrid coupler, D is (calling signal)
Detectors FA, FB, and FC are wave wave detectors, and O is a carrier wave generator.

Claims (1)

[Claims] 1 A plurality of first θ terminal devices comprising a television receiver and a telephone, a television camera, a television intercom,
a second terminal device having a panel; a television signal transmission means for distributing the television signal from the communal antenna to the television receivers in the plurality of first terminal devices; and the second terminal device. θ) Video signal from TV camera,
a modulating means for modulating a carrier wave of a frequency corresponding to a channel that can be received by the television receiver of the first terminal device but is not used for the television signal from the communal antenna; and attenuating the modulated carrier wave. means for transmitting said television signals to said television signal transmission means; The first terminal device further includes means for preventing reception of the modulated carrier wave distributed by the modulating means, and the first terminal device is equipped with means for preventing reception of the modulated carrier wave distributed by the modulating means, When the first terminal device is called, the television camera is activated in the second terminal device and sends the video signal to the modulation means, and in the specific first terminal device that is called, A television intercom system characterized in that the call signal controls reception prevention means for the modulated carrier wave of the first terminal device, thereby enabling the television receiver to receive the video signal.