JPH05236139A - Television interphone set for apartment house - Google Patents

Abstract

PURPOSE:To reduce an equipment purchase cost without need of mixing a video signal from an entrance television camera and a voice signal from an entrance interphone, separation of the mixed video signal and the voice signal, selection of the television signal and the video signal and modulation and demodulation of a voice signal. CONSTITUTION:The system is provided with a coaxial cable 1 used to send a television signal from television antennas 4U,4V to each house, a coaxial cable 2 used to send a video signal from a television camera 10 to each house, and a telephone line 3 used to connect an entrance interphone 13 and each housing interphone 15 respectively independently, with a relay unit 12 and a signal generator 16. The signal generator 16 outputs a prescribed signal while the house interphone 15 is connected to the entrance interphone 13. The relay unit 12 branches and outputs the video signal from the television camera 10 while the prescribed signal is received and outputs the signal to a television receiver 9 via a mixer 8 for housing and a television terminal 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a television broadcasting joint viewing apparatus installed in an apartment house and a joint intercom apparatus having an entrance television camera. The present invention relates to a television / intercom device that can be shared for receiving an image from an entrance television camera.

[0002]

2. Description of the Related Art In an apartment house, a common intercom device equipped with an entrance TV camera is often provided as a device for checking a visitor at a common entrance in a video image of each dwelling unit and talking with the visitor. .. In the conventional intercom system of this type of the related art, it is general that each dwelling unit is provided with a dedicated monitor TV for displaying the image from the entrance TV camera, and therefore, there is a drawback that it is very expensive. On the other hand, a collective housing is usually provided with a joint viewing device for television broadcasting. Therefore, recently, by using this television broadcast co-viewing device, the television receiver for receiving the television broadcast of each dwelling unit is shared for receiving the image from the above-mentioned entrance television camera, thereby reducing the cost. Things have been proposed.

2. Description of the Related Art As a television / intercom system for an apartment house of this type, there is a system as shown in FIG. This TV / intercom system 40 mixes a TV signal from a TV broadcast receiving antenna 41 with a mixer 42 and a distributor 4.
3, the coaxial cable 53, the branch unit 45 of each dwelling unit 44, and the frequency converter 46 to receive the television receiver 4 for receiving the television broadcast.
8 while transmitting the video signal from the collective entrance device 51 with a television camera to the modulator 50 and the audio signal from the collective entrance device 51, the mixer 49 and the coaxial cable. 53, the mixer 42, the distributor 43, and the coaxial cable 53, and transmits to the branching device 45, and the audio signal transmitted to this branching device 45 is transmitted to the living room 47 from one of its output ends, while this branching is performed. The video signal transmitted to the receiver 45 is transmitted from the other output end to the television receiver 48 via the frequency converter 46. 52 is a terminator that terminates each system to a constant impedance.

This television / intercom system operates as follows. First, the caller selects the living room machine 47 of the dwelling unit 44 at the collective entrance machine 51, and when the living room machine 47 is in the standby state, the call signal is frequency-modulated from the collective entrance machine 51 toward the living room machine 47. Transmitted. At the same time, the collective entrance 51 outputs the video signal captured by its own camera. This video signal is modulated by the modulator 50 into a VHF band mid-band signal and transmitted to the frequency converter 46 of the dwelling unit 44. When receiving the call signal, the living room 47 causes the speaker to ring and supplies power to the frequency converter 46. The frequency converter 46 is a filter circuit that selects a VHF band and UHF band television signal from the television receiving antenna 41 and a VHF band video signal from the modulator 50, and changes the frequency of the video signal from the VHF band to the UHF band. It has a frequency conversion circuit for converting, and passes only the television signal when power is not supplied from the living room 47, but passes the television signal when power is supplied,
The video signal converted into the UHF band video signal is passed. The called party who is called by the ringing sound of the speaker can turn on the switch of the television receiver 48 and set it on a predetermined channel to check the calling party in the image. In addition, the user can pick up the handset of the office unit 47 and talk with the caller. Also, if the channel of the television receiver 48 is switched, it is possible to watch television broadcasting during a call.

[0005]

By the way, the above-mentioned conventional television / intercom system is designed to transmit the video signal and the audio signal from the collective entrance 51 to each dwelling unit by the same coaxial cable. A mixer 49 for mixing a signal and an audio signal is provided, a branching device 45 for separating a video signal and an audio signal is provided in each dwelling unit, and a frequency converter 46 for selectively passing a television signal and a video signal is provided in each dwelling unit. A modulator / demodulator 47, 51 provided to modulate / demodulate an audio signal
Has to be provided on the entrance side and each dwelling unit, and since such frequency converters and modulators / demodulators are expensive, there is a drawback that equipment purchase costs increase. Therefore, an object of the present invention is to provide a mixer 49 for mixing a video signal with a calling signal and an audio signal, and a splitter 45 for separating the video signal and the audio signal.
And a frequency interconverter 46 for selectively passing a television signal and a video signal, and modulators / demodulators 47, 51 for modulating / demodulating an audio signal are not required, and a television / intercom system for a housing complex for reducing equipment purchase costs is provided. Especially.

[0006]

In order to achieve the above object, a television / intercom system for housing complex according to the present invention comprises a television signal transmission cable for transmitting a television signal from a television broadcast receiving antenna to each dwelling unit, and a common entrance. The video signal transmission cable for transmitting the video signal from the TV camera to each dwelling unit, and the telephone line connecting the intercom for the entrance and the intercom for each dwelling unit are independently provided, and the video signal from the TV camera is provided. Is provided with a frequency converter for converting a video signal in a frequency band of a vacant channel of television broadcasting and transmitting the video signal to the video signal transmission cable,
A signal output means for outputting a predetermined signal only while the intercom for dwelling unit is connected to the intercom for entrance, and a video signal from the frequency converter only while receiving the signal output by the signal output means. For each dwelling unit, a video signal distribution means for branching output and a signal mixing means for mixing the video signal branched and output by the video signal distribution means with a television signal and outputting the mixed signal to a television receiver for receiving television broadcasting are provided. It is characterized by being installed in.

[0007]

The television signal received by the television broadcast receiving antenna is transmitted to each dwelling unit by the television signal transmission cable, and is output to the television receiver for receiving the television broadcast through the signal mixing means of each dwelling unit. Now, when a visitor calls the intercom for the dwelling unit of a dwelling unit that he / she wants to visit using the intercom for the dwelling unit, the signal output means of the dwelling unit is connected while the intercom for the dwelling unit and the dwelling unit intercom are connected.
A predetermined signal is output to the video signal distribution means. On the other hand, the TV camera at the common entrance takes a picture of the visitor and outputs the video signal to the frequency converter. The frequency converter converts this video signal into a video signal in the frequency band of a vacant channel for television broadcasting, and transmits the video signal to the video signal distribution means of each dwelling unit via a video signal transmission cable independent of the television signal transmission cable. The video signal distribution means of the dwelling unit called by the visitor receives the predetermined signal from the signal output means, and controls the video signal sent via the video signal transmission cable to the signal mixing means. It outputs to the television receiver for receiving the television broadcast via. The resident of the called-up dwelling unit adjusts the channel of the television receiver for receiving the television broadcast to the empty channel,
You can visually check the visitors. This visual confirmation can be performed before picking up the handset of the dwelling unit intercom or while the telephone is picked up. It is also possible to watch TV broadcast during a call. In this way, the video signal from the TV camera at the common entrance is transmitted by the video signal transmission cable that is independent from the TV signal transmission cable, and the signal is transmitted between the intercom for the entrance and the intercom for the dwelling unit of each dwelling unit. A telephone line independent of the video signal transmission cable is used.Furthermore, the signal output means, the video signal distribution means, and the signal mixing means are provided in each dwelling unit, and the calling is performed by calling the dwelling unit intercom from the entrance intercom. Since the image from the above-mentioned television camera can be projected on the television receiver for receiving the television broadcast of the residential unit, a mixer 49 for mixing the image signal and the audio signal as in the conventional example of FIG. 2 is provided. Or a branching device 45 for separating a video signal and an audio signal is provided, or a frequency for selectively passing a television signal and a video signal. It is not necessary to provide a converter 46 or modulator / demodulators 47 and 51 for modulating / demodulating an audio signal, and the signal output means and the video signal distributing means have a simpler circuit configuration than the frequency converter and the modulator / demodulator. Since it can be purchased at a low price, the device purchase cost can be significantly reduced compared to the conventional example.

[0008]

The present invention will be described in detail below with reference to the embodiments shown in the drawings. In FIG. 1, reference numeral 1 denotes a coaxial cable for transmitting a television signal, which includes a VHF antenna 4V, a UHF antenna 4U, a head end 5V, 5U, a mixer 6, and a distributor as a television signal distributing means provided in each dwelling unit. 7
Are connected. The mixer 6 is a device that mixes the signal from the VHF antenna 4V and the signal from the UHF antenna 4U, and the distributor 7 is a device that branches and outputs a television signal to each dwelling unit. The television receiver 9 for receiving the television broadcast of each dwelling unit is connected to the distributor 7 through a television terminal 17 and a dwelling unit mixer 8 as a signal mixing means. In addition, 2 is a coaxial cable for transmitting a video signal of a visitor, which is a coaxial cable for transmitting a video signal. The television camera 10 is provided at a common entrance of a housing complex, and the video signal from the television camera 10 is used to identify a particular television broadcast. A frequency converter 11 for converting into an empty channel signal and a relay unit 12 as a plurality of video signal distributing means provided for each dwelling unit are connected in series. This relay unit 1
2 outputs the video signal sent via the coaxial cable 2 for transmitting the video signal to the dwelling unit mixer 8 only while receiving the signal from the signal generator 16 described later. There is. Reference numeral 3 is an intercom telephone line (hereinafter, simply referred to as a telephone line), which is connected to an intercom 13 for an entrance provided at a common entrance, a telephone exchange 14, and a plurality of intercoms 15 for a dwelling unit provided for each dwelling unit. Further, a signal generator 16 as a signal output means is connected to the intercom 15 for dwelling units. The signal generator 16 outputs a signal to the relay unit 12 in response to a drive signal output by the intercom 15 for dwelling unit receiving a call signal from the telephone exchange 14.

Next, the operation of this embodiment will be described with reference to FIG. First, when the visitor enters the room number from the intercom 13 for entrance and specifies it, the intercom 13 for entrance
At the same time, an ON signal is sent from the TV camera 10 to the telephone exchange 14 and a signal representing the room number is sent to the telephone exchange 14. The TV camera 10 is turned on by the ON signal, starts shooting, and outputs a video signal to the frequency converter 11. The frequency converter 11 converts this video signal into a video signal of a frequency of a specific empty channel of television broadcasting, and sends it to the coaxial cable 2. On the other hand, the telephone exchange 14 sends a calling signal through the telephone line 3 to the designated intercom 15 for dwelling units when receiving the signal from the intercom 13 for entrance.

Upon receiving the calling signal, the dwelling unit intercom 15 causes the built-in sounding device to ring, and at the same time outputs a drive signal to the signal generator 16. The signal generator 16 receives the drive signal and outputs a signal to the relay unit 12. When the relay unit 12 receives this signal, the video signal sent via the coaxial cable 2 is supplied to the mixer 8 for a dwelling unit.
Output to. The video signal output to the dwelling unit mixer 8 is input to the television receiver 9 through the television terminal 17. The dwelling unit intercom 15 continues to send a drive signal to the signal generator 16 while being connected to the entrance intercom 13, and the signal generator 16 continues to send a signal according to this drive signal. Therefore, the occupant of the called-out dwelling unit adjusts the channel of the television receiver 9 to the above-mentioned specific vacant channel before picking up the handset or while talking to the visitor by picking up the handset, and thereby the television camera Images from 10 can be displayed on the television receiver 9. This allows the occupant to visually check the visitor before picking up the handset, pick up the handset as needed to talk to the visitor, and watch TV broadcast during the call. It is also possible. In a dwelling unit in which no call is made from the intercom 13 for entrance, the relay unit 12 does not operate, and the video signal from the TV camera 10 is not transmitted to the TV receiver 9.

As described above, the television / intercom system for housing complex of this embodiment transmits the video signal from the entrance television camera 10 through the coaxial cable 2 for transmitting the video signal, which is independent from the coaxial cable 1 for transmitting the television signal. At the same time, signal transmission between the intercom 13 for entrance and the intercom 15 for dwelling unit of each dwelling unit is performed by a telephone line 3 independent of the coaxial cable 2 for transmitting the video signal, and further,
A signal generator 16, a relay unit 12, and a dwelling unit mixer 8 are provided in each dwelling unit, and when the dwelling unit intercom 15 is called from the entrance intercom 13, only the television receiver 9 for receiving the television broadcast of the called dwelling unit. Since the image from the entrance TV camera 10 can be displayed on the TV, a mixer 49 for mixing the video signal and the audio signal is provided as in the conventional example of FIG. 2, or the video signal and the audio signal are mixed. It is not necessary to provide a branching device 45 for separating, a frequency converter 46 for selectively passing a television signal and a video signal, and a modulator / demodulator 47, 51 for modulating / demodulating an audio signal. Since the relay unit 12 has a simpler circuit configuration than the frequency converter 46 and the modulator / demodulator and can be purchased at a low price, the purchase cost of the equipment is significantly reduced as compared with the conventional example. Can be reduced.

In the above embodiment, the signal generator 16 is provided separately from the dwelling unit intercom 15, but it may be incorporated in the dwelling unit intercom 15. Further, the power of the TV camera 10 is turned on by an ON signal from the intercom 13 for the entrance, but a photoelectric switch or a treading switch for detecting a visitor is separately provided and the detection signal is used. You can

[0013]

As is apparent from the above, the television / intercom system for housing complex according to the present invention is provided at the common entrance with the television signal transmission cable for transmitting the television signal from the television broadcast receiving antenna to each dwelling unit. A video signal transmission cable for transmitting the video signal from the TV camera to each dwelling unit, and a telephone line for connecting the intercom for the entrance and the intercom for each dwelling unit are separately provided, and the intercom for the dwelling unit is the intercom for the entrance. Signal output means for outputting a predetermined signal only while connected, video signal distribution means for branching and outputting a video signal from the television camera only while receiving the signal output by the signal output means, and the video The video signal branched and output by the signal distribution means is mixed with the TV signal, and the mixed signal is received by the TV receiver for TV broadcasting reception. Since a signal mixing means for outputting to the machine is provided for each dwelling unit, a mixer 49 for mixing a video signal and an audio signal is provided or a frequency conversion for selectively passing a television signal and a video signal as in the prior art And a branching device 45 for separating the video signal and the audio signal from each other.
And a modulator / demodulator 47, 51 for modulating / demodulating an audio signal.
It is not necessary to provide the device, and the device purchase cost can be significantly reduced as compared with the conventional example.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

FIG. 2 is a block diagram of a conventional example.

[Explanation of symbols]

1 ... Television signal transmission coaxial cable, 2 ... Video signal transmission coaxial cable, 3 ... Telephone line, 4V ... VHF antenna, 4U ... UHF antenna, 5V, 5U ... Headend, 6 ... Mixer, 7 ... Distributor, 8 ... Mixer for dwelling unit, 9 ...
TV receivers for receiving TV broadcasts, 10 ... TV cameras,
11 ... Frequency converter, 12 ... Relay unit, 13 ... Entrance intercom, 14 ... Telephone exchange, 15 ... Dwelling unit intercom, 16 ... Signal generator, 17 ... Television terminal.

Claims (1)

[Claims] 1. A TV signal transmission cable for transmitting a TV signal from a TV broadcast receiving antenna to each dwelling unit, a video signal transmission cable for transmitting a video signal from a TV camera provided at a common entrance to each dwelling unit, and an entrance. Intercoms and telephone lines connecting each dwelling unit intercom are provided independently, and the video signal from the TV camera is converted into a video signal in the frequency band of the empty channel of TV broadcasting and sent to the video signal transmission cable. A frequency converter is provided, which outputs a predetermined signal only while the dwelling unit intercom is connected to the entrance intercom, and the frequency only while receiving the signal output by the signal output unit. Video signal distributing means for branching and outputting the video signal from the converter, and video signal for branching and outputting by the video signal distributing means And a signal mixing means for mixing the mixed signal with a television signal and outputting the mixed signal to a television receiver for receiving a television broadcast, each of which is provided for each dwelling unit.