JP2008047974A - Intercom system for multiple dwelling house - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a means for detecting contact abnormality of a relay. <P>SOLUTION: A voice communication device 1 has a test means 35 of making a house apparatus A switch a contact of a branch relay in a brancher B with a control signal sent through a control line Lc to transmit a voice signal to a desired house apparatus A and also sending out a predetermined test signal to the house apparatus A through a signal line Ld. In the house apparatus A, a CPU 21 has a function as a detecting means of detecting whether the test means 35 receives the test signal within a previously set test time after sending out the test signal, and reporting that a contact of a relay constituting the transmission line to the voice communication device 1 has abnormality when the test signal is not received. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention is for an apartment house such as a condominium that enables a telephone call between a telephone device installed in a common entrance or an administrator room and a plurality of dwelling units installed in each dwelling unit. It is related to the intercom system.

  Conventionally, as this type of apartment housing intercom system (hereinafter abbreviated as intercom system), a communication device (including a management room intercom and a lobby intercom) installed at a common entrance and a desired call called by the communication device The one that can make a call with other dwelling units is provided.

  In this intercom system, the transmission line connecting between the communication device and each dwelling unit consists of a main line connected to the call device, a dwelling unit line connected to each dwelling unit, and a main line and a dwelling unit line. And a plurality of branching devices interposed at each connection site. Each branching device has three terminals, an input terminal, an output terminal, and a branching terminal. The trunk on the communication device side is connected to the input terminal, and another branch is connected to the output terminal via the trunk on the sending side. A plurality of branching devices are connected in multiple stages. A dwelling unit is connected to the branch terminal via a dwelling unit separate line.

Here, each branching unit has a contact point that can be selectively switched between a state in which the trunk line on the communication device side is connected to the trunk line on the sending side and a state in which the trunk line on the communication device side is connected to the separate line for the dwelling unit. It has a relay equipped. Thus, when a desired dwelling unit is called by the call device, the contact point of the branching unit connected to the desired dwelling unit by a unit-specific line is connected to the call device side in accordance with a control signal from the call device. It switches to the state which connects a trunk line and a dwelling unit separate line (for example, refer patent document 1).
Japanese Patent No. 2655728 (page 3)

  By the way, in the intercom system described in Patent Document 1, since the branching device is connected in multiple stages between the communication device and the dwelling unit, the relay included in the branching device is contact-welded due to overload or short-circuit current. In this case, there is a possibility that not only the dwelling unit directly connected to the branching unit but also the dwelling unit connected to the subsequent stage of the branching unit may not establish a call with the calling device. There is a similar problem in an intercom system that includes a telephone device (among them, a management room interphone) in the manager's room. Therefore, when an abnormality such as welding occurs in the contact of the relay, it is desired to restore the intercom system by exchanging and repairing the corresponding relay at an early stage.

  However, the conventional intercom system does not have a means for detecting the relay contact abnormality, and the relay contact abnormality is detected only when the user recognizes that the call between the communication device and the dwelling unit is not established. Therefore, restoration of the intercom system may be delayed.

  The present invention has been made in view of the above-described reason, and an object thereof is to provide an intercom system for an apartment house provided with means for detecting a contact abnormality of a relay.

  According to the first aspect of the present invention, there is provided a communication device capable of inputting / outputting voice and a plurality of dwelling units connected to the communication device via transmission lines, and the transmission line is connected to the communication device. The main line, the separate line connected to each dwelling unit, and a plurality of branching devices respectively connected to the connecting part of the main line and each separate line, It is composed of a control line for transmitting a control signal for designating the dwelling unit and a signal line for transmitting an audio signal when making a call between the calling device and one dwelling unit. Each of the signal lines has a relay with a contact for switching between a state in which the trunk line on the communication device side is connected to the trunk line on the sending side and a state in which the trunk line on the communication device side is connected to the separate line for the dwelling unit. Control signal to enable transmission of audio signals to and from the dwelling unit A test unit that switches the contact of the relay to the desired dwelling unit and sends a predetermined test signal to the desired dwelling unit through a signal line, and after the test unit sends the test signal, It is detected whether or not the desired dwelling unit has received a test signal at the set test time. If the test signal is not received, the transmission line between the desired dwelling unit and the communication device is connected. A detecting means for notifying that there is an abnormality in the contact of the constituting relay is provided.

  According to this configuration, the communication device causes the dwelling unit to switch the contact of the relay by the control signal so that the audio signal can be transmitted to and from the desired dwelling unit, and is directed to the desired dwelling unit. Whether or not the desired dwelling unit has received the test signal at a preset test time after the test means has transmitted the test signal through the signal line and the test means has transmitted the test signal. If a test signal is not received, a detection means is provided for notifying that there is an abnormality in the relay contact that constitutes the transmission line between the desired dwelling unit and the communication device. Therefore, it is possible to detect that there is an abnormality in the contact of the relay. In addition, the range of relays with contact failure is limited to the relays that make up the transmission line between the dwelling unit and the communication device that could not receive the test signal, so there is an abnormal relay without checking all the relays. Can be specified. Therefore, when an abnormality occurs in the contact of the relay, it is possible to quickly restore the intercom system.

  The invention of claim 2 is the invention of claim 1, wherein the trunk line is provided with a plurality of systems, and the transmission line is connected between the trunk lines of the plurality of systems and the communication device. A path switch to be selected, and the path switch includes a relay having a contact for switching between a state in which the communication device is connected and a state in which the communication device is not connected with respect to each trunk signal line, and the test means includes the path switch For the relay, the contact point of the dwelling unit is switched so that an audio signal can be transmitted to and from the desired dwelling unit, and the detection unit is in advance after the test unit sends out the test signal. It is detected whether or not the desired dwelling unit has received a test signal at the set test time. If the test signal is not received, the transmission line between the desired dwelling unit and the communication device is connected. The branching device and the And notifies that there is an abnormality in the contact of at least one relay switch.

  According to this configuration, it is possible to detect that there is an abnormality in the contact not only for the branching relay but also for the path switching relay. Therefore, when an abnormality occurs in the contact of the relay including not only the branching unit but also the path switching unit, the intercom system can be quickly restored.

  According to a third aspect of the present invention, there is provided a communication device capable of inputting / outputting voice and a plurality of dwelling units connected to the communication device via transmission lines, and the transmission line is connected to the communication device. The main line, the separate line connected to each dwelling unit, and a plurality of branching devices respectively connected to the connecting part of the main line and each separate line, It is composed of a control line for transmitting a control signal for designating the dwelling unit and a signal line for transmitting an audio signal when making a call between the calling device and one dwelling unit. Each of the signal lines has a relay with a contact for switching between a state in which the trunk line on the communication device side is connected to the trunk line on the sending side and a state in which the trunk line on the communication device side is connected to the separate line for the dwelling unit. Control signal to enable transmission of audio signals to and from the dwelling unit A test means for switching a contact of the relay and sending a predetermined test signal through a signal line toward the desired dwelling unit, and is set in advance after the test means sends the test signal. It is detected whether or not the desired dwelling unit has received the test signal at the test time, and if the test signal is not received, the relay that constitutes the transmission line between the desired dwelling unit and the communication device is detected. A detecting means for notifying that there is an abnormality in the contact is provided.

  According to this configuration, the communication device switches the contact of the relay by the control signal so that an audio signal can be transmitted to and from the desired dwelling unit, and passes through the signal line toward the desired dwelling unit. A test means for transmitting a test signal of the test unit, detecting whether the desired dwelling unit has received the test signal at a preset test time after the test means sends the test signal, When the test signal is not received, since the detecting means for notifying that there is an abnormality in the contact of the relay constituting the transmission line between the desired dwelling unit and the communication device is provided, the contact of the relay It is possible to detect that there is an abnormality. In addition, the range of relays with contact failure is limited to the relays that make up the transmission line between the dwelling unit and the communication device that could not receive the test signal, so there is an abnormal relay without checking all the relays. Can be specified. Therefore, when an abnormality occurs in the contact of the relay, it is possible to quickly restore the intercom system.

  According to a fourth aspect of the present invention, in the third aspect of the invention, the trunk line is provided with a plurality of systems, and the transmission line includes a trunk line connected to the communication device between the plurality of systems of trunk lines and the communication device. A path switch to be selected, and the path switch includes a relay having a contact for switching between a state in which the communication device is connected and a state in which the communication device is not connected with respect to each trunk signal line, and the test means includes the path switch The relay is also switched by a control signal so that an audio signal can be transmitted to and from the desired dwelling unit, and the detection means is set in advance after the test means sends out the test signal. It is detected whether the desired dwelling unit has received a test signal during the test time being set, and if no test signal is received, a transmission line is configured between the desired dwelling unit and the communication device. Said branching device and And notifying that the contacts of at least one of the relays of the road switch is abnormal.

  According to this configuration, it is possible to detect that there is an abnormality in the contact not only for the branching relay but also for the path switching relay. Therefore, when an abnormality occurs in the contact of the relay including not only the branching unit but also the path switching unit, the intercom system can be quickly restored.

  According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, the dwelling unit transmits a result signal indicating that the test signal has been received at least when the test signal is received to the communication device. It has a result reply means for replying.

  According to this configuration, since the communication device can detect whether or not the dwell unit has received the test signal, when the communication device transmits a test signal to the plurality of dwell units, the plurality of dwell units As for each, whether or not each received a test signal can be collected in a lump in the communication device.

  According to a sixth aspect of the present invention, in the fifth aspect of the present invention, the result returning means uses an audio signal transmitted through the signal line as the result signal.

  According to this configuration, since a voice signal used during a call is used as a result signal, a function as a result return means can be added to the dwelling unit by a simple change without using a dedicated device for generating the result signal. Can do.

  According to a seventh aspect of the present invention, in the sixth aspect of the present invention, the result return means sets the result signal to a frequency pre-assigned to each dwelling unit, and the call device is based on the frequency of the received result signal. It has a return origin identification means for identifying the dwelling unit that has returned the result signal.

  According to this configuration, since the communication device has the return source identification means for identifying the dwelling unit that has returned the result signal based on the frequency, even if the result signal is simultaneously returned from a plurality of dwelling units, the communication device The dwell unit that returned the result signal can be identified by decomposing the result signal into frequency components. Thus, the time required for transmission / reception of a result signal can be shortened because the communication device receives result signals from a plurality of dwelling units all at once.

  The invention according to claim 8 is the invention according to claim 5, wherein the result return means returns the result signal through the control line.

  According to this configuration, since the result signal is sent back through the control line, the result signal can also be sent back from the dwelling unit that could not receive the test signal. Based on this, it is possible to detect an abnormality of the relay. Therefore, if the result signal is not returned due to a communication error even though the dwell unit has received the test signal, it is possible to avoid erroneously determining that the relay is abnormal by returning the result signal again. Further, since the result signal does not pass through the signal line, there is an advantage that it is not necessary to prepare a special protocol for the result signal.

  According to a ninth aspect of the present invention, in any of the fifth to eighth aspects of the present invention, the call device has a result holding means for storing the content of the received result signal.

  According to this configuration, since the communication device has the result holding means for storing the contents of the result signal, when the test means sends a test signal to the plurality of dwelling units, the plurality of dwelling units reply. By storing the content of the result signal thus obtained in the result holding means, it is possible to collectively confirm the content of the result signal for each of the plurality of dwelling units. And by combining the contents of the result signals for each of the multiple dwelling units, the range of relays with abnormalities can be narrowed down, and when an abnormality occurs in the relay contacts, the intercom system is more quickly It is possible to recover. Moreover, if the result holding means is used, it is not necessary to check the contents of the result signal immediately after the result signal is returned. For example, a test signal is sent to the dwelling unit at midnight when the intercom system operation rate is low, and the next morning Thereafter, the contents of the result signal can be confirmed.

  According to a tenth aspect of the present invention, in the invention according to any one of the fifth to ninth aspects, the branching unit is provided between the trunk line on the communication device side and the dwelling unit separate line, and the contact of the relay. A test unit configured to transmit a test signal to a plurality of dwelling units through the bypass unit by using a bypass unit that is connected in parallel and allows an audio signal to pass; The test apparatus has two types of test modes: an individual test mode for individually transmitting a test signal to each dwelling unit by using a signal that does not pass the bypass means as a test signal. It has a result analysis means for narrowing down the range of relays having an abnormality by combining the received result signal and the result signal received for the individual test mode.

  According to this configuration, in the simultaneous test mode, the test signal is simultaneously transmitted to the plurality of dwelling units through the bypass means, so that the time required for transmitting and receiving the test signal can be shortened. Further, since the communication device has a result analysis means for narrowing down the range of relays having an abnormality by combining the result signal received for the simultaneous test mode and the result signal received for the individual test mode, the range of the relay having the abnormality can be reduced. It is possible to narrow down, and when an abnormality occurs in the contact of the relay, the intercom system can be restored more quickly.

  The invention according to claim 11 is the invention according to any one of claims 1 to 10, wherein the communication device receives a video signal of a video imaged by a camera when making a call with the dwelling unit. Video signal output means for transmitting through the signal line, and the test means uses at least one of a video signal and an audio signal transmitted through the signal line as the test signal.

  According to this configuration, since at least one of the video signal and the audio signal used at the time of a call is used as a test signal, the function as a test means can be achieved by a simple change without using a dedicated device for generating a test signal. It can be added to a call device.

  According to a twelfth aspect of the present invention, in the invention according to any one of the first to ninth aspects, the branching unit is provided between the trunk line on the communication device side and the dwelling unit separate line, and the contact of the relay. It has bypass means connected in parallel to pass audio signals, and the test means transmits the test signals simultaneously to the plurality of dwelling units through the bypass means by using the audio signals as the test signals. To do.

  According to this configuration, since the test signal is simultaneously transmitted to the plurality of dwelling units through the bypass means, the time required for transmitting and receiving the test signal can be shortened.

  According to a thirteenth aspect of the present invention, in the invention according to any one of the first to ninth aspects, the test means uses an audio signal transmitted through the signal line as the test signal.

  According to this configuration, since a voice signal used during a call is used as a test signal, it is possible to add a function as a test means to the call device by a simple change without using a dedicated device for generating a test signal. it can.

  According to the present invention, the communication device causes the dwelling unit to switch the contact of the relay by a control signal so that the audio signal can be transmitted to and from the desired dwelling unit, and the signal line toward the desired dwelling unit. A test means for sending a predetermined test signal through the test means, and detecting whether or not the desired dwelling unit has received the test signal at a preset test time after the test means sends the test signal. If the test signal is not received, a detecting means for notifying that there is an abnormality in the contact of the relay constituting the transmission line between the desired dwelling unit and the communication device is provided. It is possible to detect that there is an abnormality in the contact point. In addition, the range of relays with contact failure is limited to the relays that make up the transmission line between the dwelling unit and the communication device that could not receive the test signal, so there is an abnormal relay without checking all the relays. Can be specified. Therefore, there is an advantage that the intercom system can be quickly restored when an abnormality occurs in the contact of the relay.

(Embodiment 1)
The intercom system for collective housing (hereinafter, abbreviated as intercom system) of the present embodiment includes a telephone device installed at a common entrance, an administrator room, etc. It is equipped with a single dwelling unit and is configured to allow calls between the two.

  As shown in FIG. 1, the transmission line between the communication device 1 and each dwelling unit A includes a trunk line L connected to the communication device 1, a separate line Lm connected to each dwelling unit A, and a main line. And a plurality of branching devices B interposed at each connection site between the L and the dwelling unit separate line Lm. As shown in FIG. 2, each branching device B has three terminals of an input terminal T1, an output terminal T2, and a branching terminal T3, and the trunk line L on the side of the communication device 1 is connected to the input terminal T1. In addition, the input terminal T1 of another branching device B is connected to the output terminal T2 via the sending-side trunk line L, and a plurality of branching devices B are connected in multiple stages. The dwelling unit A is connected to the branch terminal T3 via the dwelling unit separate line Lm. Here, the branching device B in which no other branching device B is interposed between the communication device 1 is the front stage, and the output terminal T2 of the last branching device B is connected to the output terminal T2 as a termination means via the trunk line L on the sending side. Terminal impedance or dwelling unit A is connected. Furthermore, in the present embodiment, a plurality of systems (here, two systems of the first trunk line L1 and the second trunk line L2) are provided for the trunk line L connected to the communication device 1, and the transmission line is the trunk line L1 of the plurality of systems. , L2 and the communication device 1 have a path switch S for selecting the trunk lines L1 and L2 to which the communication device 1 is connected.

  In the following, the branching device B provided on the first trunk line L1 is denoted as branching devices B11, B12,... From the previous stage side, and the branching device B provided on the second trunk line L2 is branched from the previous stage side. .., B21, B22,..., And B21, B22,..., B21, B22,. , ... Moreover, when not distinguishing the 1st trunk line L1 and the 2nd trunk line L1, it describes with the trunk line L, and when not distinguishing the branching devices B11, B12, ..., B21, B22, ..., it describes with the branching device B, When not distinguishing dwelling unit A11, A12, ..., A21, A22, ..., it describes with dwelling unit A.

  The communication device 1 includes a management room interphone 2 installed in a manager's room, a lobby interphone 3 installed in a common entrance, and a trunk line control device 4 connected to the path switch S. The management room intercom 2 includes a microphone and a speaker (not shown) as means for inputting / outputting voice, and designates the voice line La for transmitting voice signals and the dwelling unit A to be called to the trunk line control device 4. Are connected by a control line Lc for transmitting the control signal. The lobby intercom 3 includes a microphone and a speaker (not shown) as means for inputting and outputting audio, and a camera 40 that images a visitor, and is connected to the trunk line control device by the audio line La and the control line Lc via the management room intercom 2. 4 is connected. Further, the lobby intercom 3 has a video signal output means 41 for frequency-modulating and outputting a video signal output from the camera 40, and a video line Lb for transmitting the frequency-modulated video signal (FM video signal). Is directly connected to the main line control device 4.

  Here, the video signal output from the lobby intercom 3 uses a sufficiently high frequency band compared to the audio signal, and the trunk line control device 4 transmits from the lobby intercom 3 through the control room intercom 2 through the audio line La. And a video signal transmitted from the lobby intercom 3 through the video line Lb. Further, although not shown here, a plurality of transmission lines connected to the communication device 1 are provided. The main line control device 4 has a function of selectively selecting and switching one of the one to a plurality of path switches S (only one is shown in FIG. 1) according to the transmission line to be connected. Have.

  As will be described in detail later, in the intercom system of the present embodiment, in addition to a call between the lobby intercom 3 and one dwelling unit A selected by the lobby intercom 3, all dwelling units A from the control room intercom 2 It is possible to broadcast a sound such as a blame guidance all at once.

  The trunk line L and the dwelling unit separate line Lm include a control line Lc for transmitting a control signal and a signal line Ld for transmitting a voice signal, and the branching unit B and the path switch S are provided so as to be opened and closed only for the signal line Ld. Has been. When a call is made between the lobby intercom 3 and the dwelling unit A, the signal line Ld transmits a multiplexed audio signal and video signal. Thus, during a call between the lobby intercom 3 and the dwelling unit A, the audio signal and the video signal multiplexed through the signal line Ld are transmitted between the main line control device 4 and the dwelling unit A, At the time of a call between the management room intercom 2 and the dwelling unit A, only the audio signal is transmitted through the signal line Ld between the trunk line control device 4 and the dwelling unit A.

  The configuration of each dwelling unit A will be described below with reference to FIG. In addition, since the plurality of dwelling units A all adopt the same configuration, only one dwelling unit A12 will be described below.

  The dwelling unit A includes an audio circuit 9 to which a microphone 5 and a speaker 6 are connected via amplifiers 7 and 8 as means for inputting and outputting audio. The audio circuit 9 has a function of converting the audio signal from the two signal lines Ld and the input lines and output lines of the two amplifiers 7 and 8 into two lines and four lines, and the audio signal from the signal line Ld is a speaker. The signal is output to the amplifier 8 on the 6 side, and the audio signal from the amplifier 7 on the microphone 5 side is sent to the signal line Ld.

  Here, since the audio signal and the video signal are multiplexed and transmitted to the signal line Ld as described above, the low-pass filter inserted between the audio circuit 9 and the signal line Ld in the dwelling unit A. 10 and a demultiplexing circuit 13 including a high-pass filter 12 inserted between a monitor 14 (to be described later) and a signal line Ld. In the present embodiment, the low-pass filter 10 uses an inductor having a low impedance for the audio signal and a high impedance for the video signal, and the high-pass filter 11 has a high impedance for the audio signal and the video signal. In contrast, a low impedance capacitor is used. A similar demultiplexing circuit 13 is also provided in the main line control device 4.

  The dwelling unit A is connected to the signal line Ld through a demultiplexing circuit 13, a coupling transformer 11 for balanced-unbalanced conversion, an amplifier 14, and an FM demodulator 15 for frequency-demodulating the video signal. have. Thereby, the video imaged by the lobby intercom 3 can be displayed on the monitor 16 of the dwelling unit A.

  Between the low-pass filter 10 and the audio circuit 9, a trunk power supply superposition circuit 17 capable of applying a DC voltage is provided between the signal lines Ld, so that the DC voltage is not applied to the audio circuit 9. A pair of capacitors 18 for cutting a DC voltage and a coupling transformer 19 for passing an audio signal are inserted between the main power supply superimposing circuit 17 and the audio circuit 9. The trunk power supply superimposing circuit 17 outputs a DC voltage when switching a relay contact described later.

  Further, a CPU 21 connected to the control line Lc via a control signal transmission / reception circuit 20 as an interface is provided, and the internal circuit of the dwelling unit A is controlled by the CPU 21. The control signal transmission / reception circuit 20 has a function of sending a control signal from the CPU 21 to the control line Lc and outputting a control signal received through the control line Lc to the CPU 21. The power for the internal circuit of the dwelling unit A including the CPU 21 is supplied from a power circuit 22 connected to a commercial power source.

  Furthermore, in the intercom system according to the present embodiment, a plurality of doorphone sub-units C installed respectively in front of the entrance doors of the individual dwelling units are provided. And the dwelling unit A is configured such that the voice circuit 9 is connected to the slave unit connection line Le connected to the door phone slave unit C via the slave unit interface circuit 23 and can communicate with the door phone slave unit C. Is done. Here, the dwelling unit A is provided with a handset power supply unit 25 connected to the handset connection line Le via a handset power supply superimposing circuit 24, and the power of the door phone handset C is supplied to the handset power supply unit 25. Is provided via a handset connection line Le. The doorphone sub-unit C is provided with a call button (not shown), and the sub-unit interface circuit 23 inputs a ringing sound to the voice circuit 9 when the call button is pressed by the doorphone sub-unit C. It has a function of outputting a ring tone from the speaker 6.

  By the way, regarding the control line Lc, the trunk line L and the dwelling unit separate line Lm are directly connected in the branching unit B, and the communication device 1 (the trunk line control device 4) and all the trunk lines L1, L2 are connected in the path switch S. Directly connected. Therefore, the control signal sent from the management room intercom 2 to the main line control device 4 is transmitted to all the dwelling units A. Here, the lobby intercom 3 is provided with operating means 33 having a number key and a call button for inputting an identifier for identifying the dwelling unit A (for example, a dwelling unit number of the dwelling unit in which the dwelling unit A is installed). When the call button is pressed after inputting the identifier with the number key, the dwelling unit A corresponding to the identifier is selected. When the identifier selected by the operation means 33 is transmitted through the control line Lc, the management room intercom 2 generates a control signal including an address (for example, a dwelling unit number) unique to the dwelling unit A corresponding to the identifier, The control signal is transmitted to the control line Lc of the transmission line through the control device 4.

  The CPU 21 of the dwelling unit A that has received the control signal including its own address closes the contact 26 of the dwelling unit relay inserted between the signal line Ld and the demultiplexing circuit 13 and thereby signals the audio circuit 9 and the signal. The communication path to the line Ld is established, and the image captured by the camera 40 of the lobby intercom 3 can be displayed by activating the FM demodulator 15 and the monitor 16, and the ringing sound is sent to the voice circuit 9. Is transmitted from the speaker 6 by transmitting. Furthermore, by driving the trunk power supply superimposing circuit 17 described above, a DC voltage is applied between the signal lines Ld of the dwelling unit separate lines Lm.

  On the other hand, the path switch S is inserted between the communication device 1 and the trunk lines L1 and L2 with respect to the signal line Ld, and the state in which the communication device 1 is connected to the signal line Ld of each of the trunk lines L1 and L2 Are provided with two relays (hereinafter referred to as “path switching relays”) each having contacts 27A and 27B that can be switched alternatively. The path switching relay includes a common contact 27a connected to the communication device 1, a normally open contact 27c connected to one of the trunk lines L1 and L2, and a DC cut capacitor to the trunk lines L1 and L2 different from the normally open contact 27c. The common contact 27a and the normally closed contact 27b are connected to any one of the normally closed contacts 27b connected via the reference numeral 28, and in a state where no DC voltage is applied to the drive units 29A and 29B described later. In a state where a DC voltage is applied to the drive units 29A and 29B, the common contact 27a and the normally open contact 27c are connected. With this configuration, whether or not the communication device 1 is connected to each of the trunk lines L1 and L2 can be switched depending on whether or not a DC voltage is applied to the drive units 29A and 29B of the path switching relay. The capacitor 28 is designed to have a low impedance with respect to the audio signal.

  Here, when no DC voltage is applied to any of the path switching relay drive units 29A and 29B, the first trunk line L1 is connected to the communication device 1 via the capacitor 28 and the path switching relay contact 27B. In addition to being connected, the second trunk line L2 is connected via the capacitor 28 and the contact point 27A of the path switching relay. Further, when a DC voltage is applied only to the drive unit 29A of one of the path switching relays, the first trunk line L1 is connected to the communication device 1 via the contact point 27A of the path switching relay, and the second trunk line. L2 is disconnected from the communication device 1. When a DC voltage is applied only to the drive unit 29B of the other path switching relay, the second trunk line L2 is connected to the communication device 1 via the contact point 27B of the path switching relay, and the first trunk line L1 is Disconnected from the communication device 1.

  The path switching relay drive units 29A and 29B include a pair of inductors 29a that block the passage of video signals, a diode bridge 29b having an AC input terminal connected to the signal line Ld of the trunk line L via the inductor 29a, and A drive circuit 29c that has high impedance to the audio signal, is connected between the DC output terminals of the diode bridge 29b, converts the DC voltage to a constant voltage, and applies an excitation current to an excitation coil of a path switching relay (not shown). ing.

  On the other hand, as shown in FIG. 2, the branching unit B is inserted into the branch points of the trunk lines L1 and L2 and the dwelling unit separate lines Lm with respect to the signal line Ld, and the signal line Ld of the trunk line L on the communication device 1 side is A contact 30 that can be selectively switched between a state in which the signal line Ld of the trunk line L on the sending side is connected and a state in which the signal line Ld of the trunk line L on the communication device 1 side is connected to the signal line Ld of the dwelling unit separate line Lm. It has a relay (hereinafter referred to as “branch relay”). Here, since the plurality of branching devices B are connected in multiple stages, the trunk line L on the side of the communication device 1 is connected to the preceding branching device B (the route switching device S in the first branching device B). The trunk line L means the trunk line L connected to the rear branching device B (the terminal equipment in the last branching device B). The branch relay includes a common contact 30a (corresponding to the input terminal T1) connected to the trunk line L on the side of the communication device 1, a normally closed contact 30b (corresponding to the output terminal T2) connected to the trunk line L on the sending side, and a dwelling unit. It is connected to any one of the normally open contact 30c (corresponding to the branch terminal T3) connected to the separate line Tm, and is normally connected to the common contact 30a in a state where no DC voltage is applied to the drive unit 31 described later. The closed contact 30b is connected, and the common contact 30a and the normally open contact 30c are connected in a state where a DC voltage is applied to the drive unit 31. With this configuration, whether to connect the dwelling unit separate line Lm to the trunk line L on the side of the communication device 1 can be switched depending on whether or not a DC voltage is applied to the drive unit 31 of the branch relay.

  Further, the branching device B of the present embodiment has a bypass circuit 32 (bypass means) that always connects only a sound signal separately from the contact 30 between the pair of common contacts 30a and the pair of normally closed contacts 30b. Yes. The bypass circuit 32 includes a pair of inductors 32a having a low impedance with respect to the audio signal and a high impedance with respect to the video signal, and a pair of capacitors 32b having a low impedance with respect to the audio signal and cutting direct current. It consists of a series circuit.

  The branch relay drive unit 31 includes a pair of inductors 31a having high impedance with respect to the video signal, and a diode bridge 31b having an AC input terminal connected to the signal line Ld of the dwelling unit line Lm via the inductor 31a. A drive circuit 31c that has high impedance with respect to the audio signal, is connected between the DC output terminals of the diode bridge 31b, converts the DC voltage to a constant voltage, and applies an excitation current to a not-shown branch relay excitation coil. ing.

  Next, in the intercom system having the above-described configuration, a normal operation at the time of an individual call in which a call is made between the lobby interphone 3 and one dwelling unit A selected by the lobby interphone 3 will be described.

  When one dwelling unit A is selected by the lobby intercom 3, a control signal including the address of the dwelling unit A is sent from the main line control device 4 to the control line Lc. When the CPU 21 of the corresponding dwelling unit A receives the control signal, the contact 26 of the dwelling unit relay is closed as described above, and a DC voltage is applied to the signal line Ld of the dwelling unit separate line Lm by the trunk power supply superimposing circuit 17. Applied. In the branching device B connected to the dwelling unit A, the contact point 30 of the branching relay is switched by receiving the DC voltage applied to the signal line Ld, and connects the trunk line L on the communication device 1 side and the dwelling unit separate line Lm. To do. When the trunk line L on the side of the communication device 1 and the separate line Lm are connected, the DC voltage applied to the signal line Lm of the separate line Lm is applied to the signal line Ld of the trunk line L. In the path switch S, the contact points 27A and 27B of the path switching relay are switched by receiving the DC voltage applied to the signal line Ld, and the trunk line L on the dwelling unit A side is connected to the communication device 1. Thereby, a transmission line (signal line Ld) between the lobby intercom 3 and the dwelling unit A is established, and an image captured by the camera 40 of the lobby intercom 3 is displayed on the monitor 16 of the dwelling unit A. Further, when a call button (not shown) provided on the dwelling unit A is pressed according to the ringing sound of the dwelling unit A, the voice circuit 9 of the dwelling unit A operates and the lobby intercom 3 and the dwelling unit A It becomes a state where a call can be made between.

  At this time, in the dwelling unit A that is not selected by the lobby intercom 3, the dwell unit relay contact 26 is not closed, and the trunk power supply superimposing circuit 17 does not operate. In the branching device B connected in (1), the common contact 30a and the normally closed contact 30b are connected. Furthermore, since no DC voltage is applied to the trunk line L to which only the dwelling unit A not selected by the lobby intercom 3 is connected, in the path switch S, the common contact 27a and the normally closed contact 27b are connected. Is in a state.

  The CPU 21 of the dwelling unit A receives the control signal, and when the preset call time elapses or when the call button of the dwelling unit A is pressed again in a state where a call is possible, the dwelling unit relay Are opened, the voice circuit 9 is stopped, and the trunk power supply superimposing circuit 17 is stopped, thereby terminating the individual call.

  Next, in the intercom system having the above-described configuration, a normal operation during simultaneous broadcasting in which sound is broadcast all at once from the management room intercom 2 to all the dwelling units A will be described. In this embodiment, all the dwelling units A are targeted for simultaneous broadcasting, but the dwelling units A targeted for simultaneous broadcasting may be limited.

  When a specific operation is performed by the operating means 34 provided in the management room intercom 2, a control signal (broadcast start command) for starting the broadcast is sent from the management room intercom 2 to the control line Lc. As a result, all the dwelling units A are designated as telephone conversation targets. When the CPU 21 of the dwelling unit A receives the control signal as the broadcast start command, the contact circuit 26 of the dwelling unit relay is closed to connect the audio circuit 9 to the signal line Ld of the dwelling unit separate line Lm. Further, the CPU 21 operates the voice circuit without waiting for the pressing operation of the call button.

  However, at this time, the CPU 21 does not operate the main power supply superimposing circuit 17. Therefore, the common contact point 30a and the normally closed contact point 30b are connected in all the branching devices B, and the common contact point 27a and the normally closed contact point 27b are also connected in the path switch S. As a result, the management room intercom 2 and all the dwelling units A are connected to only the audio signal via the bypass circuit 32 in the branching unit B and the capacitor 28 in the path switching unit S. From 2 the voice signal can be transmitted to all the dwelling units A.

  When the broadcast is to be ended, the operation means 34 of the management room intercom 2 is operated, and a control signal (broadcast end command) indicating that the broadcast is to be ended is transmitted to all the dwelling units A from the management room intercom 2. . The CPU 21 of the dwelling unit A that has received this control signal opens the contact 26 of the dwelling unit relay and stops the audio circuit 9.

  By the way, the above-described individual call and broadcast operations are performed when the interphone system is normal. However, due to overload or short-circuit current, the branch relay contact 30 in the branch B or the route switch S When an abnormality such as contact welding occurs at the contact points 27A and 27B of the path switching relay, the following abnormality occurs in the individual call or simultaneous broadcasting.

  That is, when the contact 30 of the branch relay of one branching device B is welded in a state where the common contact 30a is connected to the normally closed contact 30b, the housing connected to the branching device B by the housing separate line Lm. An individual call for the device A cannot be performed. Further, when the contact 30 of the branch relay of one branching device B is welded in a state where the common contact 30a is connected to the normally open contact 30c, the branching device B is separated from the branching device B by the dwelling unit. Neither of the dwelling units A connected by the line Lm can make individual calls and cannot broadcast simultaneously.

  When the contacts 27A and 27B of the path switching relay of the path switch S are welded with the common contact 27a connected to the normally closed contact 27b, the dwelling unit A connected to the trunk line L on the normally open contact 27c side. In either case, only an audio signal can be transmitted during an individual call. When the path switching relays 27A and 27B of the path switch S are welded with the common contact 27a connected to the normally open contact 27c, the dwelling unit A connected to the main line L on the normally closed contact 27b side. In either case, it is not possible to make individual calls and to broadcast simultaneously.

  Therefore, when an abnormality such as welding occurs in the relay contact of the branching device B or the path switching device S, the abnormality is detected at an early stage, and the interphone system is restored by exchanging / repairing the corresponding relay. It is desirable. Therefore, in the present embodiment, a configuration for performing a test for detecting an abnormality of the relay as described below is adopted.

  In other words, the lobby intercom 3 constituting the communication device 1 can transmit an audio signal to / from a desired dwelling unit A when a specific operation (for example, a specific command input) is performed on the operation means 33. A control signal (test start command) notifying the start of the test is transmitted from the control room intercom 2 to the desired dwelling unit A through the control line Lc, and a predetermined test is performed via the signal line Ld toward the desired dwelling unit A. The test means 35 has a function of transmitting a signal.

  In the intercom system of the present embodiment, the lobby intercom 3 performs a test in an individual test mode in which a test signal is individually transmitted to each dwelling unit A using the same route as that used during individual calls. Here, the CPU 21 of the dwelling unit A that has received the control signal as the test start command closes the contact 26 of the dwelling unit relay and applies a DC voltage to the signal line Ld of the dwelling unit separate line Lm by the trunk power supply superimposing circuit 17. Apply. Therefore, if all of the branching device B and the route switching device S are normal, a communication path using the signal line Lc is established between the dwelling unit A and the lobby intercom 3 as described above. However, in this embodiment, a video signal is employed as the test signal so that the test signal is not transmitted through the bypass circuit 32 in the branching device B and the capacitor 28 in the path switching device S.

  Further, the CPU 21 of the dwelling unit A according to the present embodiment opens the contact 26 of the dwelling unit relay and, when receiving a control signal as a test start command, when the preset test time has elapsed, the trunk power supply superimposing circuit 17. By stopping this operation, the operation in the individual test mode is terminated. However, the configuration may be such that the test is terminated when a control signal (test termination command) notifying the termination of the test is transmitted from the management room intercom 2 to the dwelling unit A.

  Here, even if the dwelling unit A receives a control signal as a test start command, it does not activate the FM demodulator 15 or the monitor 16 as in the case of an individual call, and outputs a ringing tone from the speaker 6. It is set as the structure which is not made to do.

  Next, in the intercom system according to the present embodiment, an example will be described in which a test is performed on one dwelling unit A12 in the individual test mode to detect an abnormality in a contact point of a branch relay or a path switching relay.

  When a specific operation is performed by the operation means 33 of the lobby intercom 3, the management room intercom 2 transmits a control signal serving as a test start command to the dwelling unit A12. The dwelling unit A12 receives this control signal and recognizes that the test will be started. Thereafter, the lobby intercom 3 transmits a video signal as a test signal to the dwelling unit A12 through the signal line Ld in the individual test mode.

  Here, when the contact 30 of the branch relay of the branching device B12 is welded in a state where the common contact 30a is connected to the normally closed contact 30b due to an overload or a short circuit current, the branch terminal T3 side of the branching device B12 The test signal is not transmitted to the dwelling unit A12.

  Even when the contact 30 of the branch relay of the branching device B11 is welded with the common contact 30a connected to the normally open contact 30c, the test signal is not transmitted to the output terminal T2 side of the branching device B11. The test signal is not transmitted to the dwelling unit A12.

  Furthermore, even when the contact point 27A of the route switching relay of the route switcher S is welded on the second trunk line L2, the test signal is not transmitted to the dwelling unit A12.

  From the above, when the dwelling unit A12 does not receive the test signal after receiving the control signal as the test start command, the relay contact between the lobby intercom 3 and the dwelling unit A12 (the branching devices B11 and B12). It can be determined that an abnormality has occurred in at least one of the branch relay contact 30 and the path switching relay contacts 27A and 27B) of the path switch S.

  In this embodiment, the function as a detecting means for detecting whether or not the dwelling unit A has received the test signal and notifying that there is an abnormality in the contact of the relay is the dwelling unit in this embodiment. A are provided respectively.

  That is, the CPU 21 of the dwelling unit A detects whether or not the test signal is received within the test time after receiving the control signal as the test start command. If the test signal is received, the test signal is received normally. If not, a function for displaying the test result (normal / abnormal) on the monitor 16 is added. The configuration may be such that the test result is notified by sound from the speaker 6. Further, a storage unit for storing the test result may be provided in the dwelling unit A so that the test result can be confirmed by display or sound on the monitor 16 at an arbitrary timing.

  The dwelling unit A may be configured to notify the test result only when the test result is abnormal, and further, a relay is made to a predetermined contact address such as a condominium management company via a public line. It is good also as a structure with the report function which reports that there is abnormality in automatically.

  In the present embodiment, a configuration is adopted in which a test is started by performing a specific operation with the operation means 33 of the lobby intercom 3, but a specific operation is performed with the operation means 34 provided in the management room intercom 2. The configuration for starting the test may be adopted. Further, the function of transmitting a control signal or a test signal as a test start command may be provided in any component of the communication device 1 (the lobby interphone 3, the management room interphone 2, and the main line control device 4).

  In the present embodiment, an example is adopted in which a branching device B and a path switching device S in which the relay contact is switched by a DC voltage applied from the dwelling unit A to the signal line Ld are switched to the dwelling unit A. However, the microcomputer (microcomputer) that can decode the control signal is added to the branching device B and the path switching device S, respectively, and the microcomputer receives the control signal from the communication device 1 and switches the contact of each relay. It is good.

(Embodiment 2)
The intercom system of the present embodiment detects whether or not the dwelling unit A has received the test signal, and if not, the interphone system has a function as the detection means 36 that notifies that there is an abnormality in the contact of the relay. It differs from the intercom system of Embodiment 1 in that it is provided in the management room intercom 2 as shown in FIG.

  In the present embodiment, the CPU 21 of the dwelling unit A is provided with a function as a result return means for returning the control signal (result signal) indicating the above test result to the communication device 1 and the test result received by the management room intercom 2 Based on the above, the presence or absence of abnormality is notified. Here, the dwelling unit A may be configured to return a control signal only when a test signal is received. In this case, the management room intercom 2 performs a result after sending the control signal as a test start command. The test result (normal / abnormal) is determined and notified depending on whether or not a control signal as a signal is received.

  That is, the management room intercom 2 displays the test result (normal / abnormal) on a monitor (not shown) so that it is normal if the test signal is received by the dwelling unit A and abnormal if the test signal is not received. Functions are granted. The configuration may be such that the test result is notified by sound from a speaker. In addition, the management room intercom 2 may be configured to notify the test result only when the test result is abnormal, and furthermore, to a predetermined contact address such as a condominium management company via a public line, etc. It is good also as a structure with the report function which reports that there is abnormality in a relay automatically.

  By the way, if a test in the individual test mode is performed for a plurality of dwelling units A, it is possible to narrow down relay candidates in which an abnormality has occurred. Therefore, in the present embodiment, the management room intercom 2 is provided with result holding means 37 for storing the contents of the test results for each of the plurality of dwelling units A as shown in FIGS. The test results for A can be collectively confirmed. In addition, if the result holding means 37 is used, it is not necessary to confirm the test result immediately after the test. For example, a test signal is sent to the dwelling unit A at midnight when the operation rate of the interphone system is low, and the test result is displayed after the next morning. The test can be performed efficiently such as checking.

  Below, with reference to FIGS. 3-5, the example which narrows down the candidate of the relay which has generate | occur | produced abnormality from the test result about the several dwelling unit A when it test | inspects in individual test mode is demonstrated. Here, it is assumed that the test in the individual test mode is performed for all the dwelling units A, and the test results for all the dwelling units A are obtained.

  As shown in FIG. 3, when the test results obtained are abnormal only for the dwelling units A14 to A16 (represented by “x” in the figure), the following two candidates are considered as possible relay abnormalities. Squeezed. That is, the branch relay contact 30 of the branching device B13 is welded in a state where the common contact 30a is connected to the normally open contact 30c, or all the branch relay contacts 30 of the branching devices B14 to B16 are connected to the common contact 30a. It is either welded in a state of being connected to the closed contact 30b.

  On the other hand, as shown in FIG. 4, when the obtained test result is abnormal only for the dwelling unit A14 (indicated by “x” in the figure), the branch relay contact 30 of the branching device B14 is a common contact. It can be determined that 30a is welded in a state of being connected to the normally closed contact 30b.

  In addition, as shown in FIG. 5, when all the dwelling units A <b> 11 to A <b> 16 on the first trunk line L <b> 1 side are abnormal (represented by “x” in the drawing), The following two candidates are selected as possible abnormalities. That is, the path switching relay contact 27A of the path switch S is welded with the common contact 27a connected to the normally closed contact 27b, or all the branch relay contacts 30 of the branching devices B11 to B16 are the common contact 30a. Is welded in a state of being connected to the normally closed contact 30b.

  As described above, by combining test results that are centrally managed by the management room interphone 2, it is possible to narrow down candidates for relays in which an abnormality has occurred.

  In the present embodiment, an example in which the detection unit 36 and the result holding unit 37 are provided in the management room intercom 2 has been described. However, these may be provided in the lobby intercom 3, and in this case, the lobby intercom 3 It is conceivable that the test result is displayed on the monitor provided in, or the test result is notified by sound from the speaker of the lobby intercom 3. Other configurations and functions are the same as those of the first embodiment.

(Embodiment 3)
The intercom system according to the present embodiment transmits test signals to all the dwelling units A simultaneously using the same route as that used during simultaneous broadcasting (that is, through the bypass circuit 32 in the branching unit B and the capacitor 28 in the route switching unit S). The point that the test is performed in the simultaneous test mode is different from the intercom system of the second embodiment. In the simultaneous test mode, the target dwelling unit A may be limited as in the case of simultaneous broadcasting.

  In this embodiment, the CPU 21 of the dwelling unit A that has received the control signal as the test start command closes the contact 26 of the dwelling unit relay. Therefore, if all of the branching device B and the route switching device S are normal, all the dwelling units A and the lobby intercom 3 are connected to the bypass circuit 32 in the branching device B and the capacitor in the route switching device S as described above. 28, only the audio signal is connected, and the audio signal can be transmitted from the lobby intercom 3 to all the dwelling units A. Here, an audio signal is adopted as the test signal so that the test signal is transmitted through the bypass circuit 32 in the branching device B and the capacitor 28 in the path switching device S.

  Here, it is assumed that the dwelling unit A does not activate the voice circuit 9 unlike the simultaneous call even when receiving the control signal as the test start command.

  In the simultaneous test mode, the result signals from all the dwelling units A are returned all at once, so that the dwelling unit A that is the transmission source of the received result signals can be identified in the control room intercom 2. The dwelling unit A is configured to return an audio signal to which a different frequency is assigned for each address to the management room intercom 2 as a result signal. The dwelling unit A returns the result signal when it receives a test signal, and does not return the result signal when it does not receive a test signal. In other words, in the management room intercom 2, the received result signal is decomposed into frequency components using Fourier transform or the like, and the dwelling unit that has received the test signal by the return source identifying means 38 that discriminates the dwelling unit A that has returned the result signal. The machine A is identified and the test result is obtained.

  The CPU 21 of the dwelling unit A of the present embodiment operates in the simultaneous test mode by opening the contact 26 of the dwelling unit relay when a preset test time has elapsed after receiving the control signal as the test start command. Is configured to exit. However, the configuration may be such that the test is terminated when a control signal (test termination command) notifying the termination of the test is transmitted from the management room intercom 2 to the dwelling unit A.

  Next, an example of detecting an abnormality of a contact point of a branch relay or a path switching relay in the intercom system of this embodiment will be described.

  When a specific operation is performed with the operation means 33 of the lobby intercom 3, the management room intercom 2 transmits a control signal as a test start command to all the dwelling units A all at once. Receiving this control signal, each dwelling unit A recognizes that the test will be started. Thereafter, the lobby intercom 3 transmits an audio signal as a test signal to all the dwelling units A through the signal line Ld in the simultaneous test mode.

  Here, the dwelling unit A does not apply a DC voltage to the signal line Ld, and therefore, the switching of the contact 30 of the branch relay of the branching device B and the contacts 27A and 27B of the route switching relay of the path switching device S is not performed. However, since the audio signal can be transmitted through the bypass circuit 32 in the branching unit B and the capacitor 28 in the path switching unit S, all the test signals are obtained if the contacts of all the branching relays and path switching relays are normal. Is transmitted to the dwelling unit A.

  On the other hand, when the contact 30 of the branch relay of the branching device B is welded with the common contact 30a connected to the normally open contact 30c due to overload or short circuit current, When the contact points 27A and 27B are welded with the common contact point 27a connected to the normally open contact point 27c, the test signal may not be transmitted to some of the dwelling units A.

  Then, the management room intercom 2 receives the result signal returned only from the dwelling unit A to which the test signal is transmitted, and collects the test result information.

  Hereinafter, an example of narrowing down relay candidates in which an abnormality has occurred from the test results for all the dwelling units A when the test is performed in the simultaneous test mode will be described with reference to FIGS.

  As shown in FIG. 3, when the obtained test result is abnormal only for the dwelling units A14 to A16 (represented by “x” in the figure), the contact 30 of the branch relay of the branching device B13 is a common contact. It can be determined that 30a is welded in a state of being connected to the normally open contact 30c.

  On the other hand, as shown in FIG. 5, when all the dwelling units A11 to A16 on the first main line L1 side are abnormal (represented by “x” in the figure), the route switching is performed. It can be determined that the contact 27B of one path switching relay of the container S is welded in a state where the common contact 27a is connected to the normally open contact 27c.

  As described above, by conducting the test in the simultaneous test mode, it is possible to narrow down candidates of relays in which an abnormality has occurred.

  Other configurations and functions are the same as those of the second embodiment.

(Embodiment 4)
The intercom system of the present embodiment is described in the individual test mode in which the test signal is individually transmitted to each dwelling unit A using the same route as in the individual call as described in the second embodiment. As described above, Embodiment 2 adopts a configuration in which a test is performed in two types of test modes, that is, a simultaneous test mode in which test signals are transmitted simultaneously to all the dwelling units A using the same route as in simultaneous broadcasting. , 3 is different from the intercom system.

  The control signal as a test start command sent from the management room intercom 2 includes an identifier indicating one of these two types of test modes, and the CPU 21 of the dwelling unit A can determine which test by the received control signal. Identifies the mode. In the individual test mode, a video signal is used as the test signal, and in the simultaneous test mode, an audio signal is used as the test signal.

  By the way, if only the test result of the test in the individual test mode is the pattern shown in FIG. 3 as described in the second embodiment, the possibility of relay abnormality is detected. There are two possible candidates: an abnormality of the contact point 30 of the branch relay of the device B13 and an abnormality of the contact points 30 of all the branch relays of the branch devices B14 to B16. Therefore, it is not possible to identify a relay having an abnormality.

  Here, if the test is performed not only in the individual test mode but also in the simultaneous test mode, it is possible to narrow down the relays having an abnormality more strictly than in the case of performing the test only in the individual test mode. In particular, in a large-scale intercom system having a large number of dwelling units A, the number of branching units B increases, and it is more difficult to identify abnormal relays. The effect of narrowing down is great.

  Therefore, in the present embodiment, the function as the result analysis means 39 that narrows down the range of relays having an abnormality by combining the test result of the test in the individual test mode and the test result of the test in the simultaneous test mode is provided in the control room. It is provided in the intercom 2.

  That is, if the test result shown in FIG. 3 is obtained in the test in the individual test mode and the test result in FIG. 3 is obtained in the test in the simultaneous test mode, the management room intercom 2 branches the branching device B13. If it is determined that the relay contact 30 is welded with the common contact 30a connected to the normally open contact 30c, and if the test result of FIG. It is determined that the contacts 30 of all branch relays B16 are welded in a state where the common contact 30a is connected to the normally closed contact 30b.

  In addition to the contact welding described above, the relay contact abnormality includes, for example, malfunction due to disconnection of the excitation coil, contact failure, and the like. In the interphone system of the present invention, such relay contact abnormality (non-operation, Poor contact) can also be detected. In other words, when not operating, the test results are the same as when the contacts are welded with the common contact connected to the normally closed contact, and when the contact fails on the normally closed contact side, the contact turns the common contact into a normally open contact. The test results are the same as when welding in the connected state, and in the case of contact failure on the normally open contact side, the test result is the same as when the contact is welded with the common contact connected to the normally closed contact side. It becomes.

It is a block diagram which shows the intercom system of Embodiment 1 of this invention. It is a circuit diagram which shows the structure of a branching device same as the above. It is explanatory drawing which shows the test result about several dwelling units in the intercom system of Embodiment 2 of this invention. It is explanatory drawing which shows the other test result same as the above. It is explanatory drawing which shows another test result same as the above.

Explanation of symbols

1 Calling device 21 CPU (result return means)
30 Contact of branch relay 32 Bypass circuit (bypass means)
35 Test means 36 Detection means 37 Result holding means 38 Reply source identification means 39 Result analysis means 40 Camera 41 Video signal output means 27A, 27B Route switching relay contacts A11, A12, A21 Dwelling units B11, B12, B21 Branch L1, L2 Trunk line Lc Control line Ld Signal line Lm Dwelling unit separate line S Path switch

Claims (13)

  A communication device capable of inputting and outputting voice; and a plurality of dwelling units connected to the calling device via transmission lines. The transmission line includes a trunk line connected to the calling device and each dwelling unit. Each having a separate unit connected to each other, and a plurality of branching units intervening at the connecting part between the main line and each separate unit, and the main line and the separate unit line are a communication device and one dwelling unit. A control line for transmitting a control signal for designating the dwelling unit and a signal line for transmitting an audio signal. Each of the communication devices has a relay with a contact for switching between a state in which the trunk line is connected to the main trunk on the sending side and a state in which the trunk line on the communication device side is connected to the separate line for the dwelling unit. The relay is connected to the dwelling unit by a control signal so that the signal can be transmitted. And a test time that is set in advance after the test means sends the test signal to the desired dwelling unit and has a test means for sending a predetermined test signal through the signal line toward the desired dwelling unit. Detecting whether or not the desired dwelling unit has received the test signal, and if the test signal is not received, the contact point of the relay constituting the transmission line between the desired dwelling unit and the communication device An intercom system for collective housing, characterized in that detection means for notifying that there is an abnormality is provided.   The trunk line is provided with a plurality of systems, and the transmission line has a path switch for selecting a trunk line connected to the communication device between the trunk lines of the plurality of systems and the communication device, A relay having a contact for switching between a state in which a communication device is connected and a state in which a communication device is not connected with respect to each main signal line, and the test means is also connected to the desired dwelling unit with respect to a relay of a route switcher. The dwell unit switches the contact so that an audio signal can be transmitted, and the detection unit performs a test at the desired dwell unit at a preset test time after the test unit sends the test signal. It is detected whether or not a signal is received, and when no test signal is received, at least one relay of the branching device and the path switching device constituting the transmission line between the desired dwelling unit and the communication device Different contact points Collective housing intercom system of claim 1, wherein the notifying that there.   A communication device capable of inputting and outputting voice; and a plurality of dwelling units connected to the calling device via transmission lines. The transmission line includes a trunk line connected to the calling device and each dwelling unit. Each having a separate unit connected to each other, and a plurality of branching units intervening at the connecting part between the main line and each separate unit, and the main line and the separate unit line are a communication device and one dwelling unit. A control line for transmitting a control signal for designating the dwelling unit and a signal line for transmitting an audio signal. Each of the communication devices has a relay with a contact for switching between a state in which the trunk line is connected to the main trunk on the sending side and a state in which the trunk line on the communication device side is connected to the separate line for the dwelling unit. Contact of the relay by a control signal so that the signal can be transmitted A test means for switching and sending a predetermined test signal through the signal line toward the desired dwelling unit, and after the test means sends the test signal, the desired test time is set at a preset test time. Detect whether the dwell unit has received the test signal, and if the test signal has not been received, there is an abnormality in the contact of the relay that constitutes the transmission line between the desired dwell unit and the communication device An intercom system for collective housing, characterized in that detection means for notifying is provided.   The trunk line is provided with a plurality of systems, and the transmission line has a path switch for selecting a trunk line connected to the communication device between the trunk lines of the plurality of systems and the communication device, A relay having a contact for switching between a state in which a communication device is connected and a state in which a communication device is not connected with respect to each main signal line, and the test means is also connected to the desired dwelling unit with respect to a relay of a route switcher. The contact point is switched by a control signal so that an audio signal can be transmitted, and the detection unit detects the test signal from the desired dwelling unit at a preset test time after the test unit sends the test signal. If the test signal is not received, the relay of at least one of the branching unit and the path switching unit constituting the transmission line between the desired dwelling unit and the communication device is detected. To contact Collective housing intercom system of claim 3, wherein the notifying that always there.   The said dwelling unit has a result return means for returning a result signal indicating that the test signal has been received at least when the test signal is received to the call device. The intercom system for apartment buildings according to claim 1.   6. The collective housing intercom system according to claim 5, wherein the result return means uses an audio signal transmitted through the signal line as the result signal.   The result reply means sets the result signal to a frequency pre-assigned to each dwelling unit, and the call device identifies a return source that identifies the dwelling unit that returned the result signal based on the frequency of the received result signal. The intercom system for collective housing according to claim 6, further comprising means.   6. The intercom system for an apartment house according to claim 5, wherein the result return means returns the result signal through the control line.   The intercom system for an apartment house according to any one of claims 5 to 8, wherein the communication device includes a result holding unit that stores the content of the received result signal.   The branching unit includes a bypass unit that is connected in parallel with the contact of the relay and passes a voice signal between the trunk line on the communication device side and the dwelling unit separate line. By using the test signal as a test signal, a simultaneous test mode for simultaneously transmitting a test signal to a plurality of the dwelling units through bypass means, and for each dwelling unit by using a signal that does not pass through the bypass means as a test signal There are two types of test modes: an individual test mode for transmitting a test signal to the communication device, and the communication device combines the result signal received for the simultaneous test mode with the result signal received for the individual test mode. The intercom system for an apartment house according to any one of claims 5 to 9, further comprising a result analysis means for narrowing a range of a certain relay. .   The call device includes a video signal output unit that transmits a video signal of a video captured by a camera to the dwell unit through the signal line when calling with the dwell unit. The intercom system for an apartment house according to any one of claims 1 to 10, wherein at least one of a video signal and an audio signal transmitted through a line is used as the test signal.   The branching unit includes a bypass unit that is connected in parallel with the contact of the relay and passes a voice signal between the trunk line on the communication device side and the dwelling unit separate line. The intercom system for an apartment house according to any one of claims 1 to 9, wherein a test signal is simultaneously transmitted to a plurality of the dwelling units through a bypass means by using the signal as the test signal. .   The collective housing intercom system according to any one of claims 1 to 9, wherein the test means uses an audio signal transmitted through the signal line as the test signal.

Images