JP2007150616A - Interphone system for multiple dwelling house - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an interphone system for a multiple dwelling house whereby a resident easily selects which of a plurality of shared apparatuses to preferentially make a speech. <P>SOLUTION: When a house unit 2 making a speech with a lobby interphone 1A is selected (called) from another lobby interphone 1B, the house unit 2 can display a video image transmitted from the other lobby interphone 1B on a monitor 22 to confirm it while continuing a speech with the lobby interphone 1A. Thus, the resident can easily select which of the lobby interphone 1A and the lobby interphone 1B to preferentially make a speech and can alternatively make a speech with the lobby interphones 1A, 1B while respectively establishing communication paths, then the convenience is improved. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention includes a plurality of shared unit devices installed at a common entrance of an apartment house and provided with a camera, and by selecting and calling a dwelling unit installed in each dwelling unit from any of the shared unit devices, the shared unit device Related to intercom system for collective housing that establishes a communication channel between the unit and the dwelling unit, and the dwelling unit with the established communication channel receives the video signal from the common unit device and can communicate with the common unit device It is.

Conventionally, a common unit apparatus and a dwelling unit are provided by selecting and calling a dwelling unit installed in each dwelling unit from any one of the common unit devices, which is provided at a common entrance of the apartment house and equipped with a camera. An intercom system for collective housing is provided in which a communication path is established with a machine, and a dwelling unit with the established communication path receives a video signal from the common unit and can communicate with the common unit. (For example, refer to Patent Document 1). In the conventional example described in Patent Document 1, a plurality of shared unit devices can talk simultaneously with different dwelling units using different communication paths.
JP 2005-260359 A

  However, in the above conventional example, even if a plurality of shared unit devices try to talk to the same dwelling unit, a communication path is established between the shared unit device and the dwelling unit that are calling first, so that It is impossible to make a call and display a video with the shared unit device to be called, and it is impossible to select which shared unit device is preferred by the resident who is making a call using the dwelling unit.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide an intercom system for a collective housing in which a dweller can easily select which of a plurality of shared unit devices should be preferentially talked to. It is in.

  In order to achieve the above object, a first aspect of the present invention provides a plurality of common unit devices installed at a common entrance of an apartment house and capable of inputting and outputting audio and outputting images captured by a camera, and each dwelling unit of the apartment house Are connected to each other through a transmission line and are selected by a visitor operating a selection means of the shared device, and at least one of the shared devices is connected to the shared device. The transmission line includes a trunk line connected to the common device and a separate unit line connected to each unit, and the trunk line and the separate unit line are: At least a control line for transmitting a control signal that is generated in response to an operation of the selection means and instructing the start of a call, and a plurality of signal lines for frequency-division-multiplexing an audio signal and a video signal and transmitting them to each shared device Dwelling unit , A plurality of video / audio separation means for separating the audio signal and the video signal transmitted through each signal line, a switch means for opening / closing the connection with each signal line, and a signal line between each shared device. A communication means for making a call by an audio signal transmitted through the communication device, a display means for displaying an image by a video signal transmitted from each shared device through a signal line, and a switch means for controlling each signal line. Control means for individually opening and closing the connection state, the control means from the other shared device when transmitting the audio signal and the video signal via the signal line with the one shared device When the control signal transmitted through the control line is received, the switch means is controlled to establish a communication path with the other shared unit device and from the other shared unit device through the signal line. Displays the image of the transmitted video signal Wherein the display on the unit.

  According to a second aspect of the present invention, in the first aspect of the present invention, the control means transmits another audio signal and video signal to / from one shared device via a signal line. When the control signal transmitted via the control line is received, the control signal is transmitted by controlling the switch means while establishing a communication path with the shared device that was previously talking. A communication path is established with the shared unit.

  According to a third aspect of the present invention, in the first aspect of the invention, by establishing a communication path with the dwelling unit installed in the same dwelling unit, the communication with the common unit device and the shared unit device via the dwelling unit. 1 to a plurality of sub-dwelling units capable of displaying images captured by the camera, and the control means transmits audio signals and video signals to / from one shared device via signal lines. In some cases, when the control signal transmitted from another shared device via a control line is received, a communication path is established between the other shared device and the sub-dwelling unit.

  According to a fourth aspect of the present invention, in the first aspect of the present invention, the dwelling unit includes a recording unit and a recording unit that record an audio signal and a video signal transmitted to and from the shared device, and the control unit includes: When the control signal transmitted through the control line is received from another shared unit device while the audio signal and the video signal are transmitted to the shared unit device via the signal line, An audio signal and a video signal transmitted from the shared unit device or the other shared unit device are recorded on the recording unit and the recording unit, respectively.

  According to a fifth aspect of the present invention, in the first aspect of the present invention, the control means transmits another audio signal and video signal to the one shared unit device via a signal line. When the control signal transmitted through the control line is received, the communication means can make a call with the shared unit having a higher priority determined in advance.

  According to the first aspect of the present invention, when a dwelling unit that is in communication with one shared unit is selected from another shared unit, the dwelling unit continues to communicate with the previous shared unit. Since the video transmitted from the later shared device can be displayed and confirmed on the display means, it is easy for the inhabitant to make a call with priority between the earlier shared device and the later shared device. Can be selected.

  According to the second aspect of the present invention, it is possible to make a call alternatively with a plurality of shared unit devices while establishing communication paths, thereby improving convenience.

  According to the invention of claim 3, the sub-dwelling unit can make a call with the shared device, and convenience is improved.

  According to the fourth aspect of the present invention, since the audio signal and the video signal from the shared device that has not been selected are recorded in the recording unit and the recording unit, respectively, the recorded audio and video can be confirmed later and convenience is improved. To do.

  According to the invention of claim 5, since calls with a higher-priority shared unit apparatus are automatically selected when calls with a plurality of shared unit devices overlap in time, Convenience and safety are improved.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  An example of the system configuration of this embodiment is shown in FIG. In the present embodiment, a plurality of shared unit devices (lobby interphones) 1A and 1B installed at a common entrance of an apartment house and a plurality of dwelling units 2 respectively disposed in each dwelling unit are provided, and lobby intercoms 1A and 1B are provided. And the dwelling unit 2 are connected via a transmission line. The transmission line includes a trunk line L1 connected to the lobby intercoms 1A and 1B through the video control panel 3 and the alarm monitoring panel 5, and a separate line L2 connected to each dwelling unit 2. The trunk line L1 and each A branching device 7 is interposed between each unit separate line L2.

The transmission line includes a trunk line L1 and a dwelling unit separate line L2 that is branched from the trunk line L1 and connected to each dwelling unit 2. As this transmission line, a multi-pair twisted pair cable having two or more pairs in the sheath is used. Designate the signal lines Ld ₁ and Ld ₂ for multiplexing and transmitting the video signal and the audio signal picked up by each other (not shown) and the dwelling unit 2 selected by the selection means (described later) of the lobby interphones 1A and 1B. A pair line is used for each control line Lc for transmitting a control signal to be transmitted. That is, the transmission line of the illustrated example uses three pairs of pair wires. Here, the video signals transmitted through the signal lines Ld ₁ and Ld ₂ are frequency-modulated in the lobby intercoms 1A and 1B, and the frequency-modulated video signals (hereinafter referred to as “FM video signals”) and audio signals Since the frequency band is different (the frequency of the FM video signal is sufficiently higher than the audio signal), it can be multiplexed by a frequency division multiplexing technique. The FM video signal multiplexed and transmitted with the audio signal via the signal lines Ld ₁ and Ld ₂ is transmitted by video / audio demultiplexing units 201 ₁ and 201 ₂ provided in each dwelling unit 2 as will be described later. After being separated, the frequency is demodulated by the FM demodulation units 25 ₁ and 25 ₂ and displayed on the monitor 22.

The lobby intercoms 1A and 1B include a microphone and a speaker for inputting / outputting sound, a camera for imaging a visitor, an FM modulation circuit for frequency-modulating a video signal output from the camera, and a number key for designating a dwelling unit number, When the call button is operated after the visitor operates the number key to select the dwelling unit number to be visited, the dwelling unit 2 corresponding to the dwelling unit number is selected. Here, an alarm monitoring panel 5 is connected to the lobby intercoms 1A and 1B via the communication line La and the control line Lc, and the dwelling unit number selected on the lobby intercoms 1A and 1B is monitored via the control line Lc. When transmitted to the board 5, the alarm monitoring board 5 sends a control signal (call command) to the dwelling unit 2 corresponding to the dwelling unit number via the control line Lc. Also the audio signal transmitted through the call line La passing through the alarm monitoring panel 5 lobby interphone 1A, from 1B, the FM video signals transmitted via video lines Lb _1, Lb ₂ from the lobby interphone 1A, 1B Is provided between the lobby intercoms 1A and 1B and each dwelling unit 2.

On the other hand, as shown in FIG. 2, the dwelling unit 2 includes a microphone 21a and a speaker 21b for inputting / outputting sound, and the microphone 21a and the speaker 21b are connected to the call circuit unit 24c. Here, since the signal lines Ld ₁ and Ld ₂ are used for both the audio signal and the video signal as described above, the video control panel 3 and the dwelling unit 2 have the video / audio demultiplexing units 201 ₁ and 201 _{2, respectively.} Is provided. The video / audio demultiplexing unit used in each of the video control panel 3 and the dwelling unit 2 has the same configuration, and is a low-frequency passage unit inserted between the call circuit unit 24c and the signal lines Ld ₁ and Ld _2. (Not shown) and a high-frequency passage (not shown) inserted between the coupling transformer and the signal lines Ld ₁ and Ld ₂ (however, illustration of the video control panel 3 is omitted). . The low-frequency pass section uses a low impedance (for example, inductor) with respect to the audio signal and the video signal, and the high frequency pass section has a high impedance with respect to the audio signal Use low impedance (for example, capacitor). The call circuit unit 24c includes a circuit that converts the two signal lines Ld ₁ and Ld ₂ and the input and output lines of the microphone 21a and the speaker 21b into two lines and four lines, and converts the audio signal input from the microphone 21a into an image. / audio demultiplexer 201 _1, 201 sends ₂ to the signal line Ld _1, Ld ₂ via the video / audio demultiplexing unit 201 _1, 201 ₂ separate the signal line Ld _1, the audio signal from the Ld ₂ Is output to the speaker 21b side. Therefore, lobby intercom 1A, it is possible to transmit and receive voice signals through the signal lines Ld _1, Ld ₂ between 1B and dwelling unit 2, dwelling persons with visitor used lobby intercom 1A or 1B is a dwelling unit 2 By using it, a voice call can be made between a visitor and a dweller.

  The telephone intercom unit 6 is connected to the communication circuit unit 24c provided in the dwelling unit 2 through the sub unit connection unit 23 and the sub unit connection line L3. The doorphone sub-unit 6 is arranged at the entrance of each dwelling unit of the apartment house, and includes a microphone and a speaker. The sub-unit connection unit 23 is a voice bi-directional amplifier circuit for calling with the doorphone sub-unit 6 or a call. A switch circuit or the like for connecting the circuit unit 24c is provided. Therefore, a telephone call between the door phone slave unit 6 and the dwelling unit 2 is possible. The doorphone sub unit 6 is provided with a call button, and the sub unit connection unit 23 also has a function of inputting a ringing tone to the call circuit unit 24c when the call button is operated on the door phone sub unit 6 and transmitting it from the speaker 21b. Prepare.

In the dwelling unit 2, a liquid crystal display or a CRT is used for the monitor 22. The FM video signals input to the dwelling unit ₂ through the signal lines Ld ₁ and Ld ₂ are separated by the video / audio demultiplexing units 201 ₁ and 201 ₂ and then frequency demodulated by the FM demodulation units 25 ₁ and 25 ₂ . The video signals output from the FM demodulating units 25 ₁ and 25 ₂ are input to the monitor 22 so that the video is displayed on the screen of the monitor 22. That is, since the video of the visitor imaged by the cameras of the lobby intercoms 1A and 1B is displayed on the monitor 22 of the dwelling unit 2, the dweller in the dwelling unit can confirm the visitor.

  The dwelling unit 2 is provided with a CPU 20 that controls an internal circuit, and a control signal transmission / reception unit 26 serving as an interface with the control line Lc is connected to the CPU 20. The control signal transmission / reception unit 26 has a function of sending a control signal output from the CPU 20 to the control line Lc and delivering the control signal received from the control line Lc to the CPU 20. Further, the CPU 20 is provided with operation buttons such as response buttons operated by a resident, and an operation unit 27 that outputs an operation signal when these operation buttons are operated is connected. In addition, the internal power supply (DC power supply) of the dwelling unit 2 is created from a commercial power supply (AC 100V) by a power supply circuit (not shown).

Here, for the control line Lc, the trunk line L1 and the dwelling unit separate line L2 are directly connected in the branching unit 7. Therefore, the control signal sent from the alarm monitoring panel 5 is transmitted to all the dwelling units 2 connected to the control line Lc. Here, an address (for example, a dwelling unit number) is individually set in the CPU 20 of the dwelling unit 2. By selecting an address on the lobby intercom 1A, 1B, a control signal (call command) for designating the address is an alarm. It can be transmitted from the monitoring panel 5 to all the dwelling units 2 via the control line Lc. If the address included in the control signal is its own address, the CPU 20 of the dwelling unit 2 connects the trunk line L1 in the signal lines Ld ₁ and Ld ₂ of the dwelling unit separate line L2 and the video / audio demultiplexing units 201 ₁ and 201 ₂ . The relay contacts 29 ₁ and 29 ₂ of the dwelling unit relay inserted between them are closed to establish a communication path with the lobby intercoms 1A and 1B, and the FM demodulation units 25 ₁ and 25 ₂ and the monitor 22 are activated. Then, the video of the visitor captured by the cameras of the lobby intercoms 1A and 1B is displayed on the monitor 22 of the dwelling unit 2, and the ringing tone is transmitted from the speaker 21b through the call circuit unit 24c. A baseband signal may be used for this type of control signal. Since the baseband signal has a wide frequency band and is difficult to separate from an audio signal and a video signal, this also controls the audio signal and the video signal. It is necessary from the point of transmission quality to transmit signals separately.

By the way, the dwelling unit 2 in this embodiment has a plurality (two in the illustrated example) of video / audio demultiplexing units 201 ₁ and 201 ₂ corresponding to a plurality (two in the illustrated example) of the lobby interphones 1A and 1B. And FM demodulator units 25 ₁ and 25 ₂ , but only one communication circuit unit 24 c and one monitor 22, so two video / audio demultiplexing units 201 ₁ and 201 ₂ and FM demodulation are provided. A number of switching units are provided to connect the units 25 ₁ and 25 ₂ alternatively to the call circuit unit 24c or the monitor 22, respectively.

The first switching unit 202 is provided between one of the video / audio demultiplexing unit 201 ₁ and the telephone circuit unit 24c, a second switching unit 203 and other video / audio demultiplexer 201 ₂ first switching section 202 Between. By the first switching unit 202, the call circuit unit 24 c is selectively switched and connected to _one video / audio demultiplexing unit 2011 and the second switching unit 203, and the first and second switching units 202 and 203 , a state in which the other of the video / audio demultiplexing unit 201 ₂ is connected to the state and the third switching unit 204 connected to the speech circuit unit 24c is switched alternatively. The third switching unit 204 is inserted between the second switching unit 203 and the fourth switching unit 205, and the state in which the second switching unit 203 is not connected to the fourth switching unit 205 (hereinafter referred to as a holding state). .) Alternatively. The fourth switching unit 205 selectively switches and connects the third switching unit 204 to the recording unit 220 and the video / audio demultiplexing unit 221 (described later). The recording unit 220 has a function of recording (recording) an audio signal input via the fourth switching unit 205 and a function of outputting the recorded audio signal to the speaker 21b.

The fifth switching unit 206 is provided between _one FM demodulation unit 25 ₁ and the monitor 22, and the sixth switching unit 207 is provided between the other FM demodulation unit 25 ₂ and the fifth switching unit 206. The fifth switching part 206, a monitor 22 is connected to switch alternatively to one of the FM demodulation unit 25 ₁ and the sixth switching unit 207, the fifth and sixth switching unit 206 and 207, the other FM demodulator The state in which the unit 25 ₂ is connected to the monitor 22 and the state in which the unit 25 ₂ is connected to the seventh switching unit 208 are alternatively switched. The seventh switching unit 208 is inserted between the sixth switching unit 207 and the eighth switching unit 209, and the sixth switching unit 207 is connected to the eighth switching unit 209 and not connected (hereinafter referred to as a holding state). .) Alternatively. The eighth switching unit 209 selectively switches and connects the seventh switching unit 208 to the recording unit 222 and the video / audio demultiplexing unit 221. The recording unit 222 has a function of recording (recording) a video signal input via the eighth switching unit 209 and a function of outputting the recorded video signal to the monitor 22. The video / audio demultiplexing unit 221 multiplexes the audio signal input via the fourth switching unit 205 and the video signal input via the eighth switching unit 209 and outputs the multiplexed signal to the sub-dwelling unit connection line L4. It has a function of separating frequency-division multiplexed audio signals and video signals transmitted from the sub-dwelling unit 8 via the sub-dwelling unit connection line L4. The sub dwelling unit 8 is installed in a different location from the dwelling unit 2 in the dwelling unit, connected to the dwelling unit 2 by the sub dwelling unit connection line L4, and connected to the dwelling unit separate line L2 through the dwelling unit 2. It is possible to make a call with the lobby intercoms 1A and 1B and display images captured by the lobby intercoms 1A and 1B. However, since the structure of the sub dwelling unit 8 is basically the same as that of the dwelling unit 2, illustration and description of details are omitted.

Next, the operation of this embodiment will be described. First, a case where a call is made between any one of the lobby intercoms (for example, the lobby intercom 1A) and one dwelling unit 2 will be described. A control signal (call command) is transmitted from the alarm monitoring panel 5 to the dwelling unit 2 selected by the lobby intercom 1A via the control line Lc, and the dwelling unit 2 having the same address included in the control signal has the CPU 20 Closes the relay contact 29 ₁ of the dwelling machine relay in response to the call command and activates the FM demodulator 25 ₁ and the monitor 22, and switches the fifth switch 206 to connect the monitor 22 and the FM demodulator 25 ₁ . Then, the video of the visitor imaged by the camera of the lobby intercom 1A is displayed on the monitor 22 of the dwelling unit 2, and further a ringing tone is transmitted from the speaker 21b through the call circuit unit 24c. Then, in response to a call from the lobby intercom 1A, when a resident presses a response button (not shown) of the operation unit 27 of the dwelling unit 2, the CPU 20 of the dwelling unit 2 switches the first switching unit 202. to operate the speech circuit portion 24c with connecting the call circuit unit 24c and the video / audio demultiplexing unit 201 ₁ to call capable state. At this time, the other relay contact portion 29 ₂ remains open. On the other hand, in the dwelling unit 2 that is not selected as the lobby intercom 1A, the CPU 20 does not close the relay contacts 29 ₁ and 29 ₂ of the dwelling unit relay, so that the dwelling unit 2 selected as the lobby intercom 1A and the lobby intercom 1A eventually. A communication path is established only between the telephone and the telephone and video display is possible. In addition, since it is the same also when calling with the other lobby intercom 1B and any one dwelling unit 2, description is abbreviate | omitted.

Next, an operation in the case where the dwelling unit 2 in communication with one lobby intercom 1A is selected by the other lobby intercom 1B will be described. When a control signal (call command) is transmitted from the alarm monitoring panel 5 to the dwelling unit 2 selected by the lobby intercom 1B (dwelling unit 2 in communication with the lobby intercom 1A) via the control line Lc, the dwelling unit in machine 2, the FM demodulation unit 25 ₂ start and fifth switching part 206 and the sixth switching unit 207 as well as close the relay contacts 29 ₂ dwelling units machine relay according to CPU20 control signal (call command) The monitor 22 and the FM demodulator 25 ₂ are switched to display the visitor image captured by the camera of the lobby intercom 1B on the monitor 22 of the dwelling unit 2. In other words, the dweller who was talking to the lobby intercom 1A can check another visitor by the image captured by the camera of the lobby intercom 1B that called later and displayed on the monitor 22. Then, when press operation response button of the operation unit 27 in order to talk with a visitor after the dwelling person, CPU 20 may first switching unit 202 and the second switching unit remains closed relay contact portions 29 ₁ connect the video / audio demultiplexing unit 201 ₂ to the speech circuit unit 24c switches the 203, it is possible to call the communication path is established between the lobby interphone 1B.

On the other hand, another dweller can use the sub dwelling unit 8 to talk to a later visitor. Although not shown, the dwelling unit 2 and the sub dwelling unit 8 are connected by a control signal line, and the CPU 20 of the dwelling unit 2 that has been selected from the lobby intercoms 1A and 1B and has received a control signal (call command). Transfers the calling command to the sub dwelling unit 8 in the dwelling unit via the control signal line, and also sounds the calling sound in the sub dwelling unit 8. When the response button of the sub-dwelling unit 8 is pressed according to the ringing tone, a control signal (response command) is returned from the sub-dwelling unit 8 to the CPU 20 of the dwelling unit 2 via the control signal line. dwelling unit 2 CPU20 is second to fourth switching unit 203 to 205 as well as the sixth to eighth and controls the switching unit 207 to 209 video / audio demultiplexing unit 201 ₂ and the FM demodulation unit 25 ₂ and the image according to / If the audio demultiplexing unit 221 is connected, a communication path is established between the sub dwelling unit 8 and the lobby intercom 1B via the sub dwelling unit connection line L4 and the dwelling unit separate line L2, so that calls and video can be displayed. It becomes.

Further, when a call with the previous lobby intercom 1A is continued, it is possible to record the audio signal transmitted from the later lobby intercom 1B in the recording unit 220 and record the video signal in the recording unit 222. . That is, when the dwelling people recording recording mode by operating the operation button of the operation unit 27 is selected, CPU 20 may record unit video / audio demultiplexer 201 ₂ switches the second to fourth switching unit 203 to 205 220, the audio signal transmitted from the lobby intercom 1B is recorded by the recording unit 220, and the sixth to eighth switching units 207 to 209 are switched to connect the FM demodulation unit 25 ₂ to the recording unit 222. The video signal transmitted from the lobby intercom 1B is recorded by the recording unit 222. The audio signal recorded in the recording unit 220 and the video signal recorded in the recording unit 222 can be reproduced on the speaker 21b and the monitor 22 by operating the operation buttons of the operation unit 27, respectively.

  Thus, according to the present embodiment, when the dwelling unit 2 talking with one lobby intercom 1A is selected (called) from another lobby intercom 1B, the dwelling unit 2 is connected to the previous lobby intercom 1A. Since the video transmitted from the later lobby interphone 1B can be displayed and confirmed on the monitor 22 while continuing the telephone call, a call is preferentially made to either the previous lobby interphone 1A or the subsequent lobby interphone 1B. This makes it possible for a resident to easily select the phone number, and to make an alternative call with a plurality of lobby intercoms 1A and 1B being established, thereby improving convenience. In addition, the sub-unit 8 installed in the dwelling unit can also communicate with the lobby intercoms 1A and 1B, and further record audio signals and video signals from the lobby intercom 1B in the recording unit 220 and the recording unit 222, respectively. Therefore, there is an advantage that the recorded audio and video can be confirmed later and convenience is improved.

  By the way, one of the plurality of lobby intercoms 1A and 1B (for example, the lobby intercom 1A) is mainly used by a normal visitor, and the other (for example, the lobby intercom 1B) is mainly used by a visitor having an urgent requirement (an emergency). In the case of use by a member, fire brigade, police officer, etc.), the latter lobby intercom 1B is set higher in priority than the former lobby intercom 1A and is recorded in the memory (not shown) of the CPU 20 and is recorded as described above. If the CPU 20 automatically selects a call with the lobby intercom 1B according to the priority when a call is received from the other lobby intercom 1B during a call with the one lobby intercom 1A, the convenience In addition, there is an advantage that safety can be improved.

  In the present embodiment, the lobby intercoms 1A and 1B are described as two units. However, the present invention is not limited to this, and three or more lobby intercoms 1 may be provided.

It is a system configuration figure showing an embodiment of the present invention. It is a block diagram of the dwelling unit in the same as the above.

Explanation of symbols

1A, 1B Lobby intercom (shared equipment)
2 dwelling unit L1 trunk L2 dwelling by line Ld _1, Ld ₂ signal line Lc control line

Claims (5)

A plurality of common unit devices installed at the common entrance of the apartment building that can input and output audio and output video captured by the camera, and a plurality of common unit devices installed at each dwelling unit of the apartment house each have a transmission line. And a plurality of dwelling units that establish a communication path with at least one of the shared unit devices when selected by a visitor operating the selection means of the shared unit device. ,
The transmission line includes a trunk line connected to the common unit device and a separate line connected to each dwelling unit, and the trunk line and the separate dwelling line are generated at least by the operation of the selection means and instruct the start of the call. A control line for transmitting a control signal, and a plurality of signal lines for frequency-division-multiplexing an audio signal and a video signal to transmit between each shared device,
The dwelling unit has a plurality of video / audio separation means for separating the audio signal and the video signal transmitted through each signal line, a switch means for opening / closing a connection with each signal line, and each shared device. Call means for making a call by an audio signal transmitted via a signal line, display means for displaying an image by a video signal transmitted from each shared device via a signal line, and a switch means for controlling each signal Control means for individually opening and closing the connection state with the wire,
The control means receives the control signal transmitted from another shared unit device via the control line when transmitting an audio signal and a video signal to the one shared unit device via the signal line. In such a case, the switch means is controlled to establish a communication path with the other shared unit apparatus and the display unit displays an image based on the video signal transmitted from the other shared unit apparatus via the signal line. This is an intercom system for collective housing.   The control means receives the control signal transmitted from another shared unit device via the control line when the audio signal and the video signal are transmitted to the one shared unit device via the signal line. In this case, the communication path is established with the shared section device that has transmitted the control signal by controlling the switch means while establishing the communication path with the shared section apparatus that has been in communication. The intercom system for collective housing according to claim 1 characterized by the above-mentioned. One or more capable of establishing a communication path with a dwelling unit installed in the same dwelling unit and making a call with the common unit device and displaying images captured by the camera of the common unit unit via the dwelling unit. Equipped with
The control means receives the control signal transmitted from another shared unit device via the control line when the audio signal and the video signal are transmitted to the one shared unit device via the signal line. When it does, the communication path is established between the said other shared part apparatus and a sub dwelling unit, The intercom system for housing complexes of Claim 1 characterized by the above-mentioned. The dwelling unit includes a recording unit and a recording unit that record an audio signal and a video signal transmitted to and from the shared unit device,
The control means receives the control signal transmitted from another shared unit device via the control line when the audio signal and the video signal are transmitted to the one shared unit device via the signal line. The intercom for collective housing according to claim 1, wherein the audio signal and the video signal transmitted from the one shared unit device or the other shared unit device are recorded in the recording unit and the recording unit, respectively. system.   The control means receives the control signal transmitted from another shared unit device via the control line when the audio signal and the video signal are transmitted to the one shared unit device via the signal line. In such a case, the intercom system for an apartment house according to claim 1, wherein a call means can be used to communicate with a shared unit apparatus having a higher priority determined in advance.

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