JP3992047B2 - Intercom system for housing complex - Google Patents

Description

  The present invention is an assembly that enables communication by alternatively establishing a communication path between a common unit device installed at a common entrance of an apartment house and any one of the dwelling units installed in each dwelling unit. The present invention relates to a residential intercom system.

  Conventionally, a common unit (lobby intercom) installed at the common entrance of an apartment house and capable of voice input and output, and a common unit installed at each dwelling unit of an apartment house are connected via a transmission line and shared. A plurality of dwelling units (such as an interphone master unit and a housing information panel) that establish communication paths with the shared unit device when a visitor selects a selection means (such as a numeric keypad) that the unit device has. There is provided an intercom system for a collective housing provided with a doorphone handset installed in each dwelling unit of the housing complex and connected to the dwelling unit through a handset connection line for telephone calls. The transmission line includes a main line connected to the common unit and a plurality of separate units branched from the main line, and the main line and the separate unit line are generated at least when the selection unit is operated and instruct to start a call. A control line for transmitting a control signal to be transmitted and a speech line for transmitting a voice signal.

  By the way, the simplest system of this type has only one trunk line, and when multiple lobby intercoms are installed, no other lobby intercom can talk while one of the lobby intercoms is talking. become.

Therefore, conventionally, a control signal is transmitted via a control line by providing a call switching unit between a plurality of dwelling unit separate lines branched from a plurality of trunk lines each connected to a lobby intercom and a dwelling unit. By controlling the call switcher to selectively switch the telephone line of any one of the dwelling unit lines and connect it to the dwelling unit, a plurality of lobby intercoms can be It was made possible to talk with a machine (see, for example, Patent Document 1).
JP-A-1-196953

  However, in the above-described conventional system, the communication circuit is switched between the receiving circuit that receives the control signal via the control line, the control circuit that drives the switching element such as a relay based on the received control signal, and performs switching connection of the dwelling unit separate line. Since it was necessary to prepare for a telephone, a call switcher will become expensive. In addition, since such an expensive call switch is required for each of the plurality of dwelling units, there has been a problem that the cost of the entire system is significantly increased.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an intercom for collective housing that allows simultaneous calls between a plurality of common unit devices and dwelling units while suppressing an increase in cost as compared with the conventional case. To provide a system.

In order to achieve the above object, a first aspect of the present invention provides a plurality of common unit devices that are installed at a common entrance of an apartment house and are capable of inputting and outputting audio, and a plurality of common unit devices that are installed at each dwelling unit of the apartment house. And a plurality of dwelling units that are connected via transmission lines and that establish a communication path with the shared unit when selected by a visitor operating the selection means of each shared unit. The transmission line includes a plurality of trunk lines connected to a plurality of shared section devices and a plurality of dwelling unit separate lines branched from each main line, and the trunk line and the dwelling unit separate line are at least for the operation of the selection means. A control line that transmits a control signal that is generated along with an instruction to start a call and a call line that transmits a voice signal, and one of the call lines included in a plurality of separate units is selected as a dwelling unit. It has a call switcher that can be switched and connected, Talk switcher includes a plurality of sets of common contact connected to multiple switching contact and dwelling machine each call line of the plurality of dwelling units per line is connected, at the time of non-operation either the common contact of each pair of each set A plurality of switch elements for switching and connecting the common contact of each group to any other switching contact of each group during operation when power is supplied from the dwelling unit. Comprises a selecting means and a calling means for making a call with the dwelling unit via the communication path, and each dwelling unit makes a call with the shared device via the communication path. A communication means for performing, a control signal receiving means for receiving the control signal via a transmission line, and a communication path connected to the communication means are selectively switched and connected to any one of the plurality of sets of common contacts. a speech path switching means, control received by the control signal receiving means Residential units being branched call path switching means in response to a signal from any of the common contacts are connected to the selected source common unit device by turning on or off the power supply to the call switching unit causes the switching node mains It is characterized by comprising a separate line and a control means for switching and connecting the call means.

According to a second aspect of the present invention, in the first aspect of the present invention, any one of a telephone device installed in a manager's room of an apartment house and connected to each dwelling unit via a transmission line, and a telephone line included in a plurality of trunk lines A trunk line switch that selectively switches one of them to a communication device, and the trunk line switch is connected to a plurality of switching contacts to which each of the plurality of trunk lines is connected and to the communication device. a plurality of sets of contacts, nonoperating to the common contact of each pair of each set one of switching the operation power is supplied from the communication device causes connected to contact point of each common contact of each pair set of other comprising a plurality of switching element that connects switching to any of the switching contact, the communication device includes a selection means for selecting one of dwelling unit, a communication path is established between the dwelling units machine selected by the selecting means Calling means for calling with the dwelling unit via The speech path switching means for alternatively switching connecting communication path which is connected to the speech unit to one of said plurality of sets of common contact, a common one of the communication path switching means in accordance with the selection result of the selecting means and characterized by comprising a control means for connection changeover trunk switching call line and the telephone unit of trunk lines connected to the dwelling unit of the other party by turning on or off the power supply to the exchanger with is switched for connection to the contact To do.

According to the first aspect of the present invention, the speech path switching means is switched and connected to one of the common contacts according to the control signal received by the control signal receiving means, and the power supply to the speech switch is turned on or off. Since the communication line and the communication means of the dwelling unit branch line branched from the trunk line connected to the common unit device of the selection source are switched and connected, a relay or the like according to the control signal receiving circuit or the control signal is provided as in the conventional example. It is not necessary to provide a control circuit or the like for driving control in the call switcher, and it is possible to make a call at the same time between a plurality of shared device and the dwelling unit while suppressing an increase in cost compared to the conventional one.

  According to the invention of claim 2, in addition to the effect of the invention of claim 1, the call device and the dwelling unit installed in the administrator room even during a call between the common unit device and the dwelling unit while suppressing an increase in cost. Calls can be made at the same time.

  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) 2 installed at a common entrance of an apartment house and a plurality of units (only four in the figure) installed in each unit are shown. The lobby intercom 2 and the dwelling unit 4 are connected to each other via a transmission line. Since the plurality of lobby intercoms 2 and dwelling units 4 have the same configuration, when not distinguishing each lobby intercom 2 and dwelling unit 4, “lobby intercom 2” and “dwelling unit 4” In order to distinguish between the lobby intercom 2 and the dwelling unit 4, “lobby intercom 2 ₁ ”, “lobby intercom 2 ₂ ”, “lobby intercom 2 ₃ ”, “lobby intercom 2 ₄ ” and “dwelling unit 4 ₁ ”. , “Dwelling unit 4 ₂ ”, “Dwelling unit 4 ₃ ”, and “Dwelling unit 4 ₄ ”. Transmission line, connected to the four systems trunk L1 ₁ ~L1 ₄ that are connected in four lobby interphone 2, the dwelling unit 4 via the call switch unit 5 to be described later is branched from the main line L1 ₁ ~L1 ₄ and a 4 line dwelling by line L2 ₁ ～L2 ₄ of which are further installed a call device management human room apartment (alarm monitoring panel 1) is connected to the main line L1 ₁ ~L1 _4. As this transmission line, a twisted pair cable having a pair of wires in a sheath is used. Although not shown, a plurality of systems (four systems in the illustrated example) transmit audio signals between the lobby intercom 2 and the dwelling unit 4. A pair line is used for each of the communication line La and the control line Lc for transmitting a control signal designating the dwelling unit 4 selected by the selection means (described later) of the lobby intercom 2.

  As shown in FIG. 3, the lobby interphone 2 is a microphone 24a and a speaker 24b for inputting / outputting voice, and a voice signal transmitted from the dwelling unit 4 via the telephone line La is signal-processed and output to the speaker 24b. A voice processing unit 25 that realizes a hands-free call by processing a voice signal input from 24a and sending it to the call line La; an operation switch unit 22 having a number key and a call button for designating a dwelling unit number; , A switch input unit 23 for sending an operation signal indicating the dwelling unit number designated by the operation switch unit 22, and a notification sound for generating a notification sound for notifying the operation of the operation switch unit 22 and outputting it to the speaker 24b The generation unit 26, the control unit 20 that controls the operation of each of the above-described units with the CPU as a main component, and the interface between the control unit 20 and the control line Lc And a transmitting transceiver 21 for performing. That is, when a visitor operates the number button of the operation switch unit 22 which is a selection means and selects a dwelling unit number to be visited, the call button is operated, and an operation signal is sent from the switch input unit 23 to the control unit 20 and the dwelling unit. The dwelling unit 4 corresponding to the number is selected. Here, the control unit 20 of the lobby intercom 2 sends a control signal (call command) to which the unique address assigned to the dwelling unit 4 corresponding to the selected dwelling unit number is added via the control line Lc. And send it out.

  On the other hand, as shown in FIG. 2, the dwelling unit 4 includes a microphone 41a and a speaker 41b for inputting and outputting audio, and the microphone 41a and the speaker 41b are connected to the call processing unit 42, respectively. The call processing unit 42 is connected to a two-wire four-wire conversion unit (not shown) that converts each transmission path on the receiving side and transmission side and the two-wire communication line La to two-wire four-wire. The call processing unit 42 compares the level of the voice signal (received signal) transmitted via the call line La and the level of the voice signal (transmitted signal) output from the microphone 41a to determine the call state (received state or transmitted state). When a call state is estimated, a loss is inserted into the transmission path of the transmission signal, and when a transmission state is estimated, a loss is inserted into the transmission path of the reception signal. And an echo canceller for erasing acoustic echo generated by acoustic coupling between the microphone 41a and the speaker 41b. However, since such voice switches and echo cancellers are well known in the art, detailed illustration and description of the configuration and operation are omitted. Therefore, an audio signal can be exchanged between the lobby intercom 2 and the dwelling unit 4 through the communication line La, so that the visitor and the dwelling unit can live by using the lobby intercom 2 and the resident using the dwelling unit 4. Voice calls can be made with a person.

  In addition, the dwelling unit 4 is connected to the dwelling unit 4 by selectively switching the two separate lines L2a and L2b to transmission lines (hereinafter referred to as “calling paths”) of call signals (received signals and transmitted signals). The communication path switching unit 45 is provided, and the communication processing unit 42 is selected as the communication path switching unit 45 and the handset interface unit 44 for the communication path between the communication path switching unit 45 and the call processing unit 42. There is provided a door phone switching unit 43 for switching and connecting. The door phone sub unit 3 is connected to the sub unit interface unit 44 through a sub unit connection line L3. The intercom unit 3 is disposed at the entrance of each dwelling unit of the apartment house, and includes a microphone and a speaker. The sub unit interface unit 44 includes a voice bi-directional amplifier circuit and a telephone for communicating with the intercom unit 3. An open / close circuit for connecting the roads is provided. Therefore, in a state where the door phone switching unit 43 is switched and connected to the slave unit interface unit 44, a call can be made between the door phone slave unit 3 and the dwelling unit 4 via the slave unit connection line L3. The doorphone sub unit 3 is provided with a call button and has a function of sending a call signal to the sub unit connection line L3 when the call button is operated. The dwell unit 4 has a notification sound when the call signal is detected. The ringing tone generated by the generation unit 46 is transmitted from the speaker 41b.

  The dwelling unit 4 is provided with a control unit 40 having a CPU as a main component and controlling an internal circuit, and a transmission / reception unit 47 serving as an interface with the control line Lc is connected to the control unit 40. The transmission / reception unit 47 has a function of sending a control signal output from the control unit 40 to the control line Lc and delivering the control signal received from the control line Lc to the control unit 40. Further, the dwelling unit 4 includes an operation switch unit 48a including a response button operated when answering a call, and a switch input unit 48b for inputting an operation input corresponding to the operation of the operation switch unit 48a to the control unit 40. Is provided. Furthermore, although illustration is omitted, the dwelling unit 4 is provided with an interface between the control unit 40 and various security sensors (fire detector, gas leak detector, etc.) installed in the dwelling unit. That is, in the dwelling unit 4, when a detection signal notifying the occurrence of an abnormality such as a fire or a gas leak is input from the security sensor to the control unit 40, the control unit 40 notifies the notification sound generation unit 46 of the occurrence of the abnormality. Alarm sound and a warning message are generated and transmitted from the speaker 41b, and a control signal for notifying the occurrence of abnormality is transmitted from the transmission / reception unit 47 to the alarm monitoring panel 1 via the control line Lc. 1 is also configured to provide an alarm for occurrence of an abnormality. In addition, the dwelling unit 4 having the call function and the security function in this way is particularly called a housing information board.

By the way, the control signal sent from the lobby intercom 2 is transmitted to all the dwelling units 4 connected to the control line Lc. Here, an address (for example, a dwelling unit number) is individually set in the control unit 40 of the dwelling unit 4, and the address of the dwelling unit 4 is designated by selecting the address of the dwelling unit 4 on the lobby intercom 2. A control signal (call command) can be transmitted to all the dwelling units 4 via the control line Lc. If the address included in the control signal is its own address, the control unit 40 of the dwelling unit 4 causes the notification sound (calling sound) generated by the notification sound generation unit 46 to be transmitted from the speaker 41b. When the resident presses a response button provided on the operation switch unit 48a of the dwelling unit 4 in response to the ringing sound, the control unit 40 controls the door phone switching unit 43 to cause the call processing unit 42 to communicate with the call path. In addition to switching connection to the switching unit 45, the communication line switching unit 45 is controlled as will be described later, and the telephone line La of the trunk line L1 _k (k = 1 to 4) to which the lobby interphone 2 of the caller is connected is connected. The communication path can be established by switching connection to, so that only a call can be made between the lobby intercom 2 that is the caller and the selected dwelling unit 4. The state in which the dwelling unit 4 selected in the lobby intercom 2 has established a communication path with the lobby intercom 2 indicates that the call using the appropriate operation button is terminated in the calling intercom 2 or dwelling unit 4 It ends when it is detected.

  When the call button of the doorphone sub unit 3 is pressed and a call signal is sent to the sub unit connection line L3, the control unit 40 of the dwelling unit 4 that has detected the call signal causes the notification sound generation unit 46 to generate the call signal. A notification sound (ringing sound) is transmitted from the speaker 41b. When the resident presses the response button 48b of the dwelling unit 4 in response to the ringing sound, the control unit 40 controls the door phone switching unit 43 to connect the call processing unit 42 to the slave unit interface unit 44. By switching and establishing a communication path between the doorphone slave unit 3, a call can be made between the doorphone slave unit 3 and the dwelling unit 4.

The alarm monitoring panel 1 is installed in the manager room of the apartment house. As shown in FIG. 4, the alarm monitoring panel 1 inputs the call processing unit 14 for making a call using the handset 14a and the dwelling unit number of the dwelling unit 4. An operation switch unit 12 having a number key for generating an alarm sound, an alarm sound generation unit 15 for generating an alarm sound and an alarm message for notifying the occurrence of an abnormality in the dwelling unit 4, and transmitting the alarm sound from the speaker 15a; A switch input unit 13 that sends out an operation input according to an operation; a control unit 10 that controls the operation of each of the above-described units with the CPU as a main component; A communication path switching unit 16 for selectively switching and connecting the two systems of the communication lines La ₁ and La ₂ to the call processing unit 14 is provided, and each dwelling unit 4 is connected via the communication lines La ₁ and La _2. And a function of receiving a control signal for notifying the occurrence of an abnormality transmitted from the dwelling unit 4 via the control line Lc and issuing an alarm. For example, when the administrator operates the operation switch unit 12 to input a dwelling unit number and then lifts the handset 14a of the call processing unit 14 and goes off hook, the control unit 10 controls the dwelling unit 4 corresponding to the input dwelling unit number. A control signal (call command) is generated and transmitted from the transmission / reception unit 11 to the control line Lc, and the selected dwelling unit 4 and the alarm monitoring panel 1 are the same as when the lobby intercom 2 and the dwelling unit 4 are in communication. Calls can be made only via the call line La ₁ or La ₂ .

By the way, in the dwelling unit 4 and the alarm monitoring panel 1, the communication path switching units 45 and 16 can be provided to selectively connect to the two trunk lines L1 ₁ and L1 _2. 4 provided with a call switching device 5 between the dwelling units machine 4 and trunk line L1 ₁ ～L1 ₄ so as to be alternatively switched for connection to the mains L1 ₁ ～L1 ₄ strains, alarm monitoring panel 1 and the main line L1 ₁ ~ It is provided mains switching device 5 'between L1 _4. The call switching unit 5 and the main line switching unit 5 ′ have the same configuration, and have a common contact 51a and two switching contacts (a normally closed contact 51b and a normally open contact 51c) as shown in FIG. two sets of relay 51 _1, 51 _2, a DC power source (direct current supplied through the feed line Ld from the power supply unit 17 provided in the power supply unit 49 or an alarm monitoring panel 1 provided on the dwelling unit machine 4 And a constant voltage circuit 52 for supplying an exciting current to the exciting coils L of the two sets of relays 51 ₁ and 51 ₂ . That is, when the DC voltage is not supplied from the power supply units 49 and 17, since no exciting current flows from the constant voltage circuit 52 to the exciting coil L, neither of the two sets of relays 51 ₁ and 51 ₂ operate. Each of the relays 51 ₁ and 51 ₂ maintains a state in which the common contact 51a is connected to the normally closed contact 51b, and when the DC voltage is supplied from the power supply units 49 and 17, the constant voltage circuit 52 supplies the exciting coil L. Since the exciting current flows, the two sets of relays 51 ₁ and 51 ₂ operate, and the common contact 51a is connected to the normally open contact 51c in each of the relays 51 ₁ and 51 ₂ . Therefore, the combination of the communication path switching unit 45 of the dwelling unit 4 and the communication path switching unit 16 of the alarm monitoring panel 1 with the call switching unit 5 and the main line switching unit 5 ′ allows the four trunk lines L1 _{1 to} L1 ₄ to be connected to the dwelling unit. 4 and the alarm monitoring panel 1 can be switched and connected alternatively.

Next, in the present embodiment, when a plurality of lobby intercoms 2 make a call to the dwelling unit 4 simultaneously, for example, when the lobby intercom 2 ₁ and the dwelling unit 4 ₂ are talking, the lobby intercom 2 ₂ is newly added. to explain an operation when a call with the dwelling unit 4 _1.

First, visitor control unit by operating the call button after selecting lobby interphone 2 ₂ of the operation switch section 22 number key operation to the visited dwelling unit number (dwelling units machine 4 ₁ address) from the switch input unit 23 Dispatched operation signal 20, the control line Lc of the control signal (call command) obtained by adding a unique address assigned to itself to dwelling units machine 4 ₁ the control unit 20 corresponding to a selected dwelling number To send out.

On the other hand, in the dwelling unit 4 _first callee, if the address included in the control signal received by the transmitting transceiver 41 matches its own address, the control unit 40 to generate a notification sound generation unit 46 notification sound (ringing Sound) is transmitted from the speaker 41b. Then, if the response buttons resident in accordance with the ringing tone is provided in the operation switch section 48a of the dwelling units machine 4 _1-press operation, call the call processor 42 control unit 40 controls the intercom switching unit 43 and switching connection to the road switching unit 45, to determine the main line L1 ₂ to lobby intercom 2 ₂ are connected on the basis of the further calling address included in the received control signal. In this case, the control unit 40 controls the speech path switching unit 45 for switching and connecting the connectable dwelling unit per line L2a in the trunk line L1 _2, direct current call switching device 5 from the power supply unit 49 via a feed line Ld Supply voltage. The DC voltage supplied from the power supply unit 49 causes the constant voltage circuit 52 to pass an exciting current through the exciting coil L, so that the two sets of relays 51 ₁ and 51 ₂ are driven, and the common contact 51a is normally opened from the normally closed contact 51b. It is switched to the contact 51c. As a result, trunk L1 _2, the call switch unit 5, dwelling by line L2a, the speech path switching section 45, a communication path through the intercom switching unit 43 between the dwelling units machine 4 ₁ call processing section 42 and the lobby interphone 2 ₂ Is formed, and the lobby intercom 2 ₂ and the dwelling unit 4 ₁ can communicate with each other. In the state where the communication path is established between the lobby intercom 2 ₂ and the dwelling unit 4 ₁ , the end of the call using an appropriate operation button is detected in the lobby intercom 2 ₂ or the dwelling unit 4 ₁ that is the call source. Then it ends. Here, the control unit 40 of the dwelling units machine 4 ₁ When the call is finished so stops the supply of the DC voltage via the power supply line Ld from the power supply unit 49, the exciting current does not flow to the call switch unit 5, the exciting coil L The two sets of relays 51 ₁ and 51 ₂ are not driven and the common contact 51a returns to the state of being connected to the normally closed contact 51b.

Subsequently, the operation when the alarm monitoring panel 1 and the dwelling unit 4 make a call when the lobby intercom 2 and the dwelling unit 4 are talking, for example, when the lobby intercom 2 ₁ and the dwelling unit 4 ₁ are talking. alarm monitoring panel 1 will be described an operation when a call with the dwelling unit 4 _2.

First, when the lobby intercom 2 ₁ and dwelling unit 4 ₁ is talking, lobby intercom 2 ₁ are connected by monitoring the control signal (call command) transmitted from the alarm monitoring panel 1 in the lobby intercom 2 ₁ The control unit 10 knows that the trunk line L1 ₁ is in use. Then, when the off-hook by lifting the handset 14a of the call processor 14 after the janitor entered a dwelling unit 4 ₂ dwelling units number of the called by operating the operation switch section 12 of the alarm monitoring panel 1, the alarm monitoring panel 1 The control unit 10 includes a control signal including a number designating any trunk line L1 (for example, L1 ₂ ) except the trunk line L1 ₁ currently in use, an input dwelling unit number, and an address assigned to itself. A call command is generated and transmitted from the transmission / reception unit 11 to the control line Lc. Further, the control unit 10 controls the communication path switching unit 16 to switch and connect to the designated communication line La ₁ that can be connected to the designated trunk line L 1 _2, and from the power supply unit 17 to the main line switch 5 ′ via the feeder line Ld. Is supplied with a DC voltage. The DC voltage supplied from the power supply unit 17 causes the constant voltage circuit 52 to pass an exciting current through the exciting coil L, thereby driving the two sets of relays 51 ₁ and 51 ₂ , so that the common contact 51a is normally opened from the normally closed contact 51b. It is switched to the contact 51c. As a result, the trunk line L1 ₂ and a specified call processor 14 of the alarm monitoring panel 1 is connected.

On the other hand, in the dwelling unit 4 ₂ callee, if the address included in the control signal received by the transmitting transceiver 41 matches its own address, the control unit 40 to generate a notification sound generation unit 46 notification sound (ringing Sound) is transmitted from the speaker 41b. Then, if the response buttons resident in response to the call tone is provided in the operation switch section 48a of the dwelling unit 4 _2-press operation, she calls the call processor 42 control unit 40 controls the intercom switching unit 43 and switching connection to the road switching unit 45 further determines trunk L1 ₂ to be used based on the specified number included in the received control signal. In this case, the control unit 40 controls the speech path switching unit 45 for switching and connecting the connectable dwelling unit per line L2a in the trunk line L1 _2, direct current call switching device 5 from the power supply unit 49 via a feed line Ld Supply voltage. The DC voltage supplied from the power supply unit 49 causes the constant voltage circuit 52 to pass an exciting current through the exciting coil L, so that the two sets of relays 51 ₁ and 51 ₂ are driven, and the common contact 51a is normally opened from the normally closed contact 51b. It is switched to the contact 51c. As a result, between the call processing unit 42 of the dwelling unit 4 ₂ and the alarm monitoring panel 1, the main line switch 5 ′, the main line L1 ₂ , the call switch 5, the dwelling unit separate line L2a, the call path switching unit 45, and the door phone switching unit. A communication path through 43 is formed, and the alarm monitoring panel 1 and the dwelling unit 4 ₂ can talk. The state where the communication path is established between the alarm monitoring panel 1 and the dwelling unit 4 ₂ is terminated when the end of the call using an appropriate operation button is detected in the alarm monitoring panel 1 or the dwelling unit 4 ₂ . To do. Since the call control unit 40 of the control unit 10 and the dwelling unit 4 ₁ alarm monitoring panel 1 and ends stops the supply of the DC voltage via the power supply line Ld from the power supply unit 17,49, trunk switching device In 5 ′ and the call switch 5, no exciting current flows through the exciting coil L, and the two relays 51 ₁ and 51 ₂ are not driven and the common contact 51a returns to the state of being connected to the normally closed contact 51b. .

As described above, according to the present embodiment, the dwelling unit 4 and the alarm monitoring panel 1 that can be connected to the two systems of trunk lines L1 are connected to the four systems of trunk lines L1 _{1 to} L1 using the call switch 5 and the trunk switch 5 ′. ₄ , and the switching of the trunk lines L1 _{1 to} L1 ₄ in the call switching unit 5 and the trunk switching unit 5 ′ is performed by the power supply units 49 and 17 provided in the dwelling unit 4 and the alarm monitoring panel 1. Since the DC voltage supply is turned on / off, the control signal receiving circuit and the control circuit for driving and controlling the relay in accordance with the control signal as in the conventional example are switched to the call switch 5 and the main line switching. It is not necessary to prepare for the device 5 ', and it is possible to make a call simultaneously between the plurality of lobby interphones 2 and the dwelling unit 4 while suppressing an increase in cost as compared with the prior art, and during a call between the lobby intercom 2 and the dwelling unit 4 Alarm monitoring panel 1 and residence A call can be made with the door unit 4 at the same time.

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. It is a block diagram of the lobby intercom in the same as the above. It is a block diagram of the alarm monitoring board in the same as the above. It is a block diagram of the call switch and main line switch in the same as the above.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Alarm monitoring board 2 Lobby intercom 4 Dwelling unit 5 Call switch 5 'Trunk line switch L1 Trunk line L2 Dwelling unit separate line La Call line Lc Control line

Claims (2)

A plurality of common unit devices installed at the common entrance of an apartment house and capable of voice input and output, and a plurality of common unit devices installed at each dwelling unit of the apartment house are connected to each other via a transmission line. And a plurality of dwelling units that establish a communication path with the shared device when the visitor selects the selection means that the device has, and the transmission line is divided into a plurality of shared devices. Including a plurality of connected trunk lines and a plurality of dwell unit separate lines branched from each main line, and the main line and the dwell unit separate line transmit at least a control signal that is generated in accordance with the operation of the selection means and instructs the start of a call. A communication line comprising a control line and a communication line for transmitting audio signals, and having a call switching unit for selectively switching one of the communication lines included in a plurality of separate units to the unit. The switch is connected to each telephone line of multiple units separate lines. A plurality of sets of common contact connected to multiple switching contact and dwelling unit that, during operation of the power supply from the dwelling unit with connecting the each set of common contact during periods of inactivity in any one of switching contact of each pair is supplied A plurality of switch elements that switch-connect the common contact of each set to any other switching contact of each set , and each shared device is connected to the selection unit and the dwelling unit via the communication path Each dwelling unit receives the control signal via a transmission line and a call means for making a call with a shared device via the communication path. According to the control signal received by the control signal receiving means, the communication path switching means for selectively switching and connecting the call path connected to the call means to any one of the plurality of common contacts. any of the common contact of the speech path switching means Te Control means for a call line and call means dwelling-specific lines from on or trunk line connected to the selected source common unit device by turning off is branched power supply to the call switching unit is switched for connection with be switched for connection to An intercom system for collective housing, characterized by comprising Select one of the telephone equipment connected to each dwelling unit installed in the manager's room of the apartment house via a transmission line and the telephone lines included in multiple trunk lines. and a trunk switching device for, trunk switching unit includes a plurality of sets of common contact connected to multiple switching contact and call apparatus each call line of the plurality of trunk lines are connected, each set of common contact during periods of inactivity and a plurality of switching element to switch connects each set of common contact during operation power is supplied from the communication device to any other switching contact of each pair together is connected to either the switching contact of each pair The communication device includes: a selecting unit that selects any dwelling unit; and a calling unit that calls the dwelling unit via a communication path established between the dwelling unit selected by the selecting unit. , wherein the plurality of sets of speech path connected to the call unit A speech path switching means for alternatively switching connection to one of the common contact, the power supply to the mains switching device causes are switched for connection to the common contact of either the speech path switching means in accordance with the selection result of the selecting means 2. The intercom system for an apartment house according to claim 1, further comprising a control means for switching and connecting a trunk telephone line connected to a dwelling unit of a telephone partner and a telephone means by turning on or off.

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