JPH0614745B2 - Intercom system for multiple dwelling houses - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to an intercom system for a housing complex, and in particular, a video signal sharing a coaxial line laid for a cable TV,
The present invention relates to an intercom system for an apartment house that allows a call signal to be transmitted.

[Technical background of the invention] Conventionally, an intercom system for a housing complex with a television as shown in Fig. 4 is known. In this type of intercom system 10 for housing complex, 1 is a controller for controlling the intercom system, 2 is a manager room, 3 is installed in a manager room 2 and is connected to the controller 1 by a plurality of pair wires 8. The administrator room master unit, 4 is the controller 1 and a plurality of pair wires 8,
A collective entrance with camera connected by a coaxial line 5, 5 is a floor terminal, and 7 is a room with a TV monitor installed in a dwelling unit 6.

Next, the operation of the intercom system for a housing complex with a television will be described with reference to FIG. First, when the caller enters the room number of the TV monitor-equipped room 7 that is about to call the TV camera-equipped collective entrance 4, the number information is transmitted to the controller 1. Then, the controller 1 decodes the number information and then transmits the information to the floor terminal 5 on the destination floor. Therefore, the floor terminal 5 designates the room machine 7 to be called based on the information and generates a ringing tone. At the same time, the shutter (not shown) of the TV camera installed in the collective entrance 4 is opened and the image of the caller is displayed on the TV monitor (not shown) of the called room 7.
In this state, if the called party picks up the handset (not shown), the call with the calling party becomes possible. In this case, the control signal and the call signal are transmitted by the pair line 8 and the video signal is transmitted by the coaxial line 9.

[Problems of background art] However, in this type of intercom system for a housing complex with a television, each dwelling unit must be equipped with a television monitor dedicated to the intercom as a means for displaying an image of a caller. Since paired wires and coaxial wires have to be laid, there is a problem that equipment purchase costs and construction costs generally increase.

[Object of the Invention] The present invention has been made in view of the above problems.
Use the coaxial cable for cable TV not only as a transmission path for general broadcasting TV signals but also as a transmission path for various signals used for intercom, and use the general broadcasting TV receiver of each unit for its original use. In addition to being provided, it can also be used as a TV monitor of an intercom to display the image of the caller on an empty channel of a TV receiver for general broadcasting, and a TV receiver dedicated to the intercom for housing can be deleted. The object is to provide a residential intercom system.

[Summary of the Invention] In order to achieve this object, according to the intercom system for a housing complex of the present invention, a control signal for selecting a room unit to be called is transmitted using a baseband band and frequency-modulated. The voice signal of the calling side is transmitted using the FM band, the voice signal transmitted from the called side using the FM band is demodulated, and the video signal of the caller is transmitted using the mid band. A housing unit equipped with a TV camera, a modulator for a mid band that modulates a video signal sent from a collective entrance, a control signal and an audio signal transmitted from the collective entrance, and a modulator for a mid band A mixer for mixing the received video signal with a television signal for general broadcasting transmitted using the VHF band and the UHF band, and the mixer for transmitting the signal via a coaxial cable for cable television. And a distributor for distributing various signals to each system formed by the group of room units, a serial unit connected to a predetermined number from the output end of the distributor and having a plurality of outputs, and a first output of the serial unit It is connected to the end and selected by the control signal,
It is connected to the room unit that demodulates the audio signal transmitted from the collective entrance machine and frequency-modulates the audio signal transmitted to the collective entrance machine to make a call, and is connected to the second output end of the serial unit and the baseband band. When the power is supplied from the indoor unit that has received the control signal from, the video signal that has been frequency-converted from the midband band to the specific UHF band signal and the VHF and UHF band general broadcast television signal are passed. , A frequency converter that passes only the VHF band and UHF band general broadcast TV signals when the power is not supplied, and a television receiver that receives the video signal output from the frequency converter and the general broadcast TV signal. It is equipped.

[Embodiment of the Invention] A preferred embodiment of the present invention will be described in detail below with reference to FIG. The intercom system 40 for a housing complex of the present invention includes a receiving antenna 41, a second mixer 42, a distributor 43, and a branching unit 4 as a series unit (DC penetration type series unit).
5, frequency converter 46, living room 47, television receiver 4
8, first mixer 49, modulator for midband 50, collective entrance machine with TV camera (hereinafter referred to as collective entrance machine) 5
1. Terminator 52, cable television coaxial line 53, control line 54
It is formed by and.

Here, the collective entrance machine 51 transmits a control signal for selecting the room machine 47 to be called using the baseband band,
The frequency-modulated voice signal of the calling side is transmitted using the FM band, the voice signal transmitted from the called side using the FM band is demodulated, and the video signal of the calling party is captured in the mid-band band. Is to be transmitted. The mid-band modulator 50 modulates the video signal transmitted from the collective entrance 51. First mixer 49
Is for mixing the control signal and the audio signal transmitted from the collective entrance 51 with the video signal transmitted from the mid-band modulator 50. The second mixer 42 mixes the output signal of the first mixer 49 and a general broadcast television signal transmitted using the VHF band and the UHF band. Distributor 43
Is a coaxial line 53 for a cable TV from the second mixer 42.
The various signals transmitted via the are distributed to each system formed by the group of room units. The branching unit 45 has a plurality of outputs, each of which is connected to a predetermined number from the output end of the distributor 43, and at least one of the branching outputs is a direct current penetration type. The living room unit 47 is connected to the first output terminal of the branch unit 45, demodulates the voice signal transmitted from the collective entrance unit 51 selected by the control signal, and outputs the demodulated sound signal to the collective entrance unit 51. The voice signal to be transmitted is frequency-modulated to make a call. Frequency converter 4
Reference numeral 6 denotes a video signal and a VHF band which are frequency-converted into a UHF band signal while being connected to the second output end of the branching device 45 and being supplied with power by the living room unit 47. Passes UHF band general broadcast TV signals and VH when power is not supplied
Only the TV signals for general broadcasting in the F band and the UHF band are allowed to pass. The television receiver 48 receives the video signal and the general broadcast television signal output from the frequency converter 46. Receiving antenna 41
Receives a television signal for general broadcasting in the VHF band and the UHF band. The terminating device 52 terminates each system to a constant impedance. Coaxial line 53 for cable TV
Is to connect the above-mentioned devices and share the same line to transmit various signals. The control line 54 is used for controlling the power supply of the frequency converter 46 by the living room unit 47.

Next, the operation of the intercom system for housing complex will be described based on the first. First, the caller sets up a dwelling unit 44 at the set entrance 51.
When the room machine 47 is selected, a control signal as shown in FIG. 3 is transmitted from the collective entrance machine 51 to the room machine 47 using the baseband.

The code structure of the control signal in this case is as follows. That is, 30 is a sync pulse for synchronizing the entire code, 3
1 is a code representing the device number of the starting side, 32 is a code representing the device number of the receiving side, and 33 is the type of information content, that is, whether it is mere communication information, broadcast information, or confirmation information from the receiving side. 34 is 35
Is a code indicating the number of bytes that the information is composed of, 35 is transmission or reception data consisting of variable-length bytes, and 36 is an error correction used to identify whether or not there is an error in the information from 31 to 35. It is a code.

The control signal transmission path is 51-49-42-43-4.
It looks like 5-47. At this time, if the living room unit 47 is in the standby state, the living room unit 47 notifies the collective entrance unit 51 that it is in the standby state. The signal transmission path at this time is the reverse path when the control signal is transmitted. As a result, the collective entrance 51 controls a built-in ringing tone generation circuit (not shown) to generate a ringing tone. This calling signal is frequency-modulated and transmitted to the living room unit 47. At the same time, the collective entrance machine 51 opens a shutter (not shown) of its own camera and outputs a video signal photographed to the midband modulator 50. This video signal is modulated by the midband modulator 50 and transmitted to the frequency converter 46 through the route 51-50-49-42-43-45-46. On the other hand, the living room 47 demodulates the frequency-modulated ringing signal to cause a speaker (not shown) to ring and turn on the power of the frequency converter 46. Then, the video signal transmitted using the mid band is frequency-converted into a signal of a specific UHF band. At this time, if the called party who is called by the ringing tone turns on the switch of the television receiver 48 and sets it to a predetermined channel, the image of the calling party is displayed. Further, when the called party picks up the band set (not shown) of the living room 47, the frequency-modulated audio signal from the living room 47 is collected by the collective entrance 51.
Be transmitted to. On the other hand, in the collective entrance machine 51, the living room machine 4
When recognizing the information that the handset from 7 has been picked up, the voice signal from the office unit 47 is demodulated and the call between the calling party and the called party becomes possible.

Next, Fig. 2 shows the frequency spectrum used in the intercom system for housing complex. 20 is the spectrum of the control signal in the baseband, 21 is the spectrum of the FM signal transmitted from the collective entrance 51 to the room 47, 2
2 is a spectrum of an FM signal transmitted from the living room 47 to the collective entrance 51, 24 is a spectrum showing a low group in the VHF band of the television signal for general broadcasting, and 23 is a midband band from the collective entrance 51. Video signal, 2
5 is a spectrum showing a high group in the VHF band of the general broadcast TV signal, and 26 is UH of the general broadcast TV signal.
The spectrum showing the F band signal, 27 is the frequency converter 4
6 shows a video signal from the collective entrance 51 which has been converted into a TV signal in a specific UHF band among the outputs of FIG.

As described above, various signals are frequency-division-multiplexed as shown in FIG. 2, so that the intercom system for collective housing can be made to function by sharing the coaxial line for cable television. In addition, in the above-mentioned embodiment, although the collective entrance machine and the living room machine are installed, in addition to this, if there is a manager room machine,
It becomes possible to make calls and exchange images between the gathering entrance machine and the management room machine, and between the living room machine and the management room machine.

[Effects of the Invention] As is apparent from the above embodiments, according to the intercom system for an apartment house of the present invention, the control signal for selecting the room unit to be called is transmitted using the baseband band and the frequency is transmitted. The modulated voice signal of the calling side is transmitted using the FM band, the voice signal transmitted from the called side using the FM band is demodulated, and the video signal of the image of the calling party is transmitted in the mid band band. Collective front door with TV camera to transmit using, modulator for mid band that modulates video signal sent from collective entrance, control signal and audio signal transmitted from collective entrance and modulation for mid band Mixer for mixing the video signal transmitted from the mixer with the television signal for general broadcasting transmitted using the VHF band and the UHF band, and the mixer transmits the signal via the coaxial cable for cable TV. A distributor that distributes the various signals that have been transmitted to each system that is formed by a group of room units, a serial unit that is connected from the output end of the distributor by a predetermined number and each has a plurality of outputs, and a first serial unit. Connected to the output terminal of the, and demodulated the voice signal transmitted from the collective entrance machine, selected by the control signal, frequency-modulate the audio signal transmitted to the collective entrance machine When the video signal is converted from the mid band to a signal of a specific UHF band when the power is supplied from the room unit connected to the second output terminal of the unit and receiving the control signal in the base band, VHF band and UHF band general broadcast television signals are passed, and VHF is supplied when power is not supplied.
Since it is provided with a frequency converter that passes only the television signal for general broadcasting of the UHF band and the UHF band, and a television receiver for receiving the video signal and the television signal for general broadcasting output from the frequency converter, the cable television The coaxial cable can be used not only as a transmission path for general broadcasting TV signals but also as a transmission path for various signals for intercoms, and it becomes possible to display the image of the caller on the empty channel of the general broadcasting TV receiver, This has the effect of removing the TV set for exclusive use of the intercoms for apartment buildings.

[Brief description of drawings]

FIG. 1 is a block diagram of an intercom system for an apartment house according to the present invention, and FIG. 2 is a frequency arrangement diagram of various signals used in the intercom system for an apartment house according to the present invention.
FIG. 3 is a code configuration diagram of control signals used in the intercom system for collective housing according to the present invention, and FIG. 4 is a block diagram of a conventional intercom system for collective housing. 40 …… Intercom system for housing complex 42 …… Second mixer 43 …… Distributor 45 …… Splitter (series unit) 46 …… Frequency converter 47 …… Room unit 48 …… TV receiver 49 …… 1st mixer 50 ... Modulator for mid band 51 ... Collective entrance with TV camera 53 ... Coaxial line for cable TV

Claims (1)

[Claims] 1. A coaxial cable for cable television is laid, and a control signal for selecting a room unit to be called is transmitted using a baseband band, and a frequency-modulated voice signal on the calling side is transmitted by F.
In an intercom system for a housing complex that transmits using the M band, demodulates the voice signal transmitted from the called side using the FM band, and transmits the video signal of the image of the caller using the mid band A collective entrance with a television camera, a mid-band modulator for modulating the video signal sent from the collective entrance, the control signal and the audio signal and the mid transmitted from the collective entrance A mixer for mixing the video signal transmitted from the band modulator and a general broadcast television signal transmitted using the VHF band and the UHF band, and the mixer from the mixer via the wired television coaxial line. A distributor that distributes various signals transmitted by each unit to each system formed by a group of residential units, and a predetermined number of connected output terminals of the distributor each have a plurality of outputs. Connected to the serial unit and a first output terminal of the serial unit, and demodulates the audio signal transmitted from the collective entrance machine selected by the control signal and transmitted to the collective entrance machine. A frequency is used when power is supplied from a living room unit that performs frequency modulation on the audio signal and a second output terminal of the serial unit that receives the control signal in the baseband and is powered by the living room unit. Passes the video signal converted from the midband band to the specific UHF band signal and the TV signal for general broadcasting of VHF band and UHF band, and for general broadcasting of VHF band and UHF band when power is not supplied Select a frequency converter that passes only the television signal and a channel of the video signal that has become the signal of the specific UHF band output from the frequency converter. Intercom system for collective housing, characterized by comprising a television receiver for receiving a video signal and general broadcast television signal when it is 予Jime switch ON and.