JP5537575B2 - Intercom system for housing complex - Google Patents

Description

  The present invention provides an alternative communication channel between any one of a common unit device installed at a common entrance of an apartment house, a telephone device installed in a management room, and a dwelling unit installed in each dwelling unit. The intercom system for collective housing that enables communication by establishing a communication system, in particular, in addition to individual calls in which the common unit device and the communication device and one dwelling unit make a one-to-one call, to the plurality of dwelling units simultaneously by the calling device The present invention relates to an intercom system for collective housing that can broadcast.

  Conventionally, a communication path is alternatively set between any one of a common unit installed at a common entrance of a housing complex and a communication device installed in a management room and a dwelling unit installed in each dwelling unit. In addition to individual calls in which the common unit device and the call device and one dwelling unit call one-on-one, the collective housing can be broadcast to a plurality of dwelling units by the call device. An intercom system is provided (see Patent Document 1).

  FIG. 4 is a system configuration diagram showing a conventional example. A communication device (management room intercom) 100 installed in a management room of an apartment house includes a microphone 101a, a speaker 101b, a transmission amplifier 101c that amplifies the output (sending signal) of the microphone 101a, and an input (receiving signal) to the speaker 101b. A communication circuit 101 including a two-wire four-line conversion circuit 101e that performs two-wire four-line conversion between the two-line communication line La and the input lines and output lines of the two amplifiers 101c and 101d. I have.

  On the other hand, the dwelling unit 110 installed in each dwelling unit includes a microphone 111a, a speaker 111b, a transmission amplifier 111c that amplifies the output (transmission signal) of the microphone 111a, and a reception amplifier that amplifies the input (reception signal) to the speaker 111b. 111d, a call circuit 111 including a 2-line 4-line conversion circuit 111e for converting 2-line 4-line conversion between the 2-line call line La and the input lines and output lines of the two amplifiers 111c, 111d, and the call circuit 111 A connection switch 112 that switches between a state connected to the line La and a state not connected, and is connected when a call start instruction is received from the communication device 100 by a control signal transmitted via a control line (not shown). The switch 112 is closed and a communication path is established with the call device 100 to enable individual calls. Further, in the case where the communication device 100 performs simultaneous broadcasting for a plurality of dwelling units 110, in each dwelling unit 110 that has received an instruction to start simultaneous broadcasting from the calling device 100 by a control signal transmitted via a control line, Speakers of a plurality of dwelling units 110 for which a broadcast channel is established from the call device 100 via the call line La by closing the connection switch 112 and establishing communication paths with the call device 100. 111b is transmitted.

Furthermore, in the above conventional example, the main device 120 is provided on the call line La between the call device 100 and the dwelling unit 110 in order to broadcast simultaneously using the call line La for individual calls. The main device 120 includes an amplifier 121 that amplifies an audio signal at the time of broadcast, a matching transformer 122 for matching the impedance in the frequency band of the audio signal of the communication line La to which a plurality of dwelling units 110 are connected, and a matching A first changeover switch 123 that switches between a state in which the series circuit of the transformer 122 and the amplifier 121 is connected to the communication line La on the dwelling unit 110 side and a state in which the connection is not made, and the audio signal is the amplifier 121, the matching transformer 122, and the first changeover. And a second changeover switch 124 that selectively switches between a route passing through the switch 123 and a route not passing through the switch 123. That is, in the main apparatus 120, when the first changeover switch 123 is opened and the second changeover switch 124 is closed during the individual call, the audio signal is transmitted through a path that does not pass through the amplifier 121, the matching transformer 122, and the first changeover switch 123. When the first changeover switch 123 is closed and the second changeover switch 124 is opened during the broadcast, the audio signal is transmitted through the path passing through the amplifier 121, the matching transformer 122, and the first changeover switch 123. The telephone line La can be shared for broadcasting.

Japanese Patent Publication No. 8-28780

  However, in the above-described conventional example, since the broadcast audio signal is transmitted through the matching transformer 122 in the main device 120 with the impedance matched to the impedance of the communication line La or the reception impedance of the dwelling unit 110, As the number of dwelling units 110 increases, the attenuation of the audio signal increases, and there is a problem that the amplification degree of the amplifier 121 of the main device 120 must be increased to compensate for the attenuation.

  The present invention has been made in view of the above problems, and it is an object of the present invention to provide an intercom system for collective housing that can suppress the attenuation of audio signals during simultaneous broadcasting.

  In order to achieve the above object, the first aspect of the present invention is a common unit device that is installed at a common entrance of an apartment house and can input and output voice, and an audio input and output unit that is installed in a management room of the apartment house. When the communication device and the common device installed in each dwelling unit of the apartment house and the communication device are connected via a transmission line and selected by operating the selection means of the common device or the communication device. A plurality of dwelling units that establish a communication path with the common unit device or the communication device, and the transmission line is a trunk line connected to the common unit device and the communication device and a separate line connected to each dwelling unit. The trunk line and the dwelling unit separate line are composed of at least a control line that is generated in response to the operation of the selection means and transmits a control signal that instructs the start of an individual call, and a signal line that transmits a voice signal. Between the dwelling unit Call means for making a call through a signal line, selection means for selecting a dwelling unit as a call partner, simultaneous broadcast start instructing means for instructing start of broadcast for a plurality of dwelling units, and selection means A control signal for instructing the start of an individual call to the dwelling unit selected in (1) is transmitted via the control line, and when the start of the simultaneous broadcast is instructed by the simultaneous broadcast start instructing unit, to a plurality of target dwelling units And a control unit that transmits a control signal for instructing the start of simultaneous broadcasting via a control line, and the dwelling unit performs a call through the signal line with each of the common unit device and the communication device. A communication unit, a dwelling unit control unit that establishes a communication path between the shared device or the communication unit and the dwelling unit according to a control signal transmitted via the control line, a dwelling unit separate line, and a dwelling unit calling unit Between shared equipment or An individual call path including a first voice transmission circuit having an impedance matched with an input impedance and an output impedance in the apparatus, and an input in the common unit apparatus or the communication apparatus provided between the dwelling unit separate line and the dwelling unit call means And a broadcast path including a second audio transmission circuit having an impedance higher than the impedance of the output, a state where the individual call path is connected to the dwelling line, and a state where the broadcast path is connected to the dwelling line Switching means comprising a first changeover switch for selectively switching, and opening / closing means comprising a second changeover switch for opening and closing a communication path for individual calls and simultaneous broadcasting, the first changeover switch and the second changeover switch The changeover switch is connected in series, and when the dwell unit control means receives the control signal instructing the start of the individual call, the dwell unit control means controls the switching means to control the individual call path and the dwelling unit. When the control signal for instructing the start of the individual call is not received and the individual call route is not connected to the dwelling unit separate line, and the start of the individual call or simultaneous broadcasting is instructed. When the control signal is received, the switching means is controlled to establish a communication path for individual call or broadcast, and when the control signal for instructing the start of individual call or broadcast is not received, the open / close means is controlled to control individual call and broadcast. Any broadcast channel is open.

  According to the first aspect of the present invention, since the audio signal is transmitted through the individual call path switched by the switching means at the time of the individual call, a call having a high resistance against inductive noise can be performed. Audio signal is transmitted through the broadcast channel, and the impedance of the broadcast channel is higher than the input and output impedances of the common unit or communication device even if multiple dwelling units are connected. Can be suppressed. In addition, since an audio signal is transmitted through the individual call path switched by the switching means at the time of the individual call and the connection is closed only with the dwelling unit selected by the opening / closing means, and the connection with the other dwelling unit is opened, Calls that are more resistant to inductive noise can be made, and during broadcast, audio signals are transmitted through the broadcast route switched by the switching means, and the impedance of the broadcast route is the same even when multiple dwelling units are connected Since it is higher than the input and output impedances in the shared device or the communication device, it is possible to suppress the attenuation of the voice signal. Furthermore, simultaneous broadcasting can be performed only for a specific plurality of dwelling units by the opening / closing means.

1 is a system configuration diagram showing Embodiment 1 of the present invention. It is a system block diagram which shows Embodiment 2 of this invention. It is a system block diagram which shows Embodiment 3 of this invention. It is a system configuration | structure figure which shows a prior art example.

  As described in the related art, the control line among the transmission lines transmits a control signal for the common unit device (lobby interphone) 1 and the communication device (management room interphone) 3 to select the other unit 2. Therefore, the circuit connected to the control line in the lobby intercom 1, the management room intercom 3, and the dwelling unit 2 must always be operated. That is, since the control signal including the address for the lobby intercom 1 and the management room intercom 3 to select the dwelling unit 2 is transmitted to all the dwelling units 2, the control signal for receiving the control signal in all the dwelling units 2 is used. A CPU that interprets the reception circuit and the control signal and performs necessary processing always operates. On the other hand, since the processing for the audio signal and the video signal may be performed after the selection of the dwelling unit 2, the audio signal and the video signal can be handled collectively, and the frequency band of the audio signal and the video signal is different. Since they are different (video signals have a sufficiently high frequency relative to audio signals), they can be multiplexed by frequency multiplexing techniques.

  Therefore, in the embodiment described below, multiplexing means for multiplexing the FM video signal transmitted from the lobby intercom 1 via the video line Lb into the audio signal transmitted from the management room intercom 3 via the call line La. Is provided in the trunk line device 4, and an example in which the number of lines used for the transmission line is reduced as compared with the conventional configuration after the trunk line device 4 will be described. The control signal is used not only for calling the dwelling unit 2 from the lobby intercom 1 and the management room intercom 3 but also for the purpose of instructing the start of simultaneous broadcasting by the management room intercom 3. A baseband signal may be used for this type of control signal. Since the baseband signal has a wide frequency band and is difficult to separate from an audio signal and a video signal, it is difficult to control the audio signal and the video signal. It is necessary to transmit the signals separately from the viewpoint of transmission quality.

(Embodiment 1)
A system configuration diagram of this embodiment is shown in FIG. In the present embodiment, a common unit device (lobby intercom) 1 installed at a common entrance of an apartment house, a communication device (management room intercom) 3 installed in a management room, and a plurality of units respectively disposed in each dwelling unit The dwelling unit 2 is provided, and the lobby intercom 1, the management room intercom 3, and the dwelling unit 2 are connected via a transmission line. The transmission line includes a trunk line L1 connected to the trunk line device 4, and a dwelling unit separate line L2 branched from the trunk line L1 and connected to each dwelling unit 2. As this transmission line, a multi-pair twisted pair cable having two or more pairs in the sheath is used. In the illustrated example, the camera provided in the lobby intercom 1 between the lobby intercom 1 and the dwelling unit 2 (see FIG. A control signal for designating the dwelling unit 2 selected by the selection means (described later) of the lobby interphone 1 or the control room interphone 3 and the signal line Ld for multiplexing and transmitting the video signal and the audio signal picked up in (not shown). A pair line is used for each of control lines (not shown) for transmitting. That is, in the illustrated transmission line, two pairs of pair wires are used. Here, the video signal transmitted through the signal line Ld is frequency-modulated in the lobby intercom 1, and the frequency-modulated video signal (hereinafter referred to as “FM video signal”) and the audio signal are multiplexed in the trunk device 4. It becomes. The FM video signal multiplexed and transmitted with the audio signal via the signal line Ld is separated by a demultiplexing circuit 20 provided in each dwelling unit 2 as will be described later, and then frequency demodulated by an FM demodulator 25a. And displayed on the monitor 22.

  The lobby intercom 1 includes a microphone (not shown) and a speaker (not shown) for inputting and outputting audio, a camera for imaging a visitor, and an FM modulation circuit (not shown) for frequency-modulating a video signal output from the camera. ) And a selection means (not shown) having a number key for designating a dwelling unit number and a call button, and the call button is operated after the visitor operates the number key to select the dwelling unit number to be visited Then, the dwelling unit 2 corresponding to the dwelling unit number is selected. Here, the lobby intercom 1 is connected to the management room intercom 3 via the call line La and the control line, and when the dwelling unit number selected on the lobby intercom 1 is transmitted to the management room intercom 3 via the control line. The management room intercom 3 sends a control signal (call command) to the dwelling unit 2 corresponding to the dwelling unit number via the control line. Also, an audio signal transmitted from the lobby intercom 1 via the communication line La via the management room intercom 3 and an FM video signal transmitted from the lobby intercom 1 via the video line Lb are multiplexed in the trunk device 4. And transmitted to each dwelling unit 2 via the signal line Lb. That is, on the side of the dwelling unit 2 from the trunk line device 4, the signal line Ld also serves as the call line La and the video line Lb.

  The management room intercom 3 includes a microphone 31a for inputting / outputting sound and a speaker 31b, and the microphone 31a and the speaker 31b are connected to the sound circuit 30 via amplifiers 32a and 32b, respectively. The voice circuit 30 includes a circuit that performs two-line and four-line conversion between the two-line call line La and the input lines and output lines of the two amplifiers 32a and 32b, and the voice signal input from the microphone 31a is transmitted to the call line La. It has a function of sending out and outputting an audio signal from the call line La to the speaker 31b side. The management room intercom 3 is provided with a CPU (not shown) for controlling an internal circuit, and a control signal transmission / reception circuit (not shown) serving as an interface with the control line is connected to the CPU. The control signal transmission / reception circuit has a function of sending a control signal output from the CPU to the control line and delivering the control signal received from the control line to the CPU. Although not shown in the figure, the management room intercom 3 is provided with a changeover switch for switching between a state where the telephone line La connected to the lobby intercom 1 is connected to a state where the telephone line La is connected to the main line device 4 and a state where it is not connected. Only when an individual call is made between the lobby intercom 1 and any one of the dwelling units 2, the call is switched on and the call line La connected to the lobby intercom 1 is connected to the trunk line device 4. It is connected to the line La.

The trunk line device 4 passes through the video amplifier 41 that amplifies the FM video signal transmitted from the lobby intercom 1 via the video line Lb, the FM video signal amplified by the video amplifier 41 and the management room intercom 3. A multiplexing circuit 40 that multiplexes a voice signal transmitted from the lobby intercom 1 via the telephone line La or a voice signal transmitted from the management room intercom 3 via the telephone line La is provided. The multiplexing circuit 40 includes a low-frequency passage unit 40a inserted between the call line La and the signal line Ld, and a high-frequency passage unit 40b inserted between the video amplifier 41 and the signal line Ld. In the illustrated example, an inductor is used as the low-frequency passage 40a, and a capacitor is used as the high-frequency passage 40b. However, a DC cut capacitor is inserted between the low-frequency passage portion 40a and the signal line Ld.

  The dwelling unit 2 includes a microphone 21a for inputting / outputting sound and a speaker 21b, and the microphone 21a and the speaker 21b are connected to an audio circuit 24c via amplifiers 24a and 24b, respectively. Here, as described above, the demultiplexing circuit 20 is provided in order to use the signal line Ld for both the audio signal and the video signal. The demultiplexing circuit 20 includes two low-frequency passage portions 20a inserted in parallel between the audio circuit 24c and the signal line Ld, and a high-frequency passage portion 20b inserted between the coupling transformer 25c and the signal line Ld. Consists of. The low frequency passing unit 20a uses a low impedance for the audio signal and a high impedance for the video signal, and the high frequency passing unit 20b has a high impedance for the audio signal and a low impedance for the video signal. Use one. In the illustrated example, an inductor is used as the low frequency passage 20a, and a capacitor is used as the high frequency passage 20b. In addition, a first audio transmission circuit 26a having an impedance (for example, 600Ω) matching the input and output impedances of the lobby interphone 1 or the management room interphone 3 is provided between the one low-frequency passage unit 20a and the audio circuit 24c. Is inserted between the other low-frequency passage unit 20a and the audio circuit 24c and has a higher impedance (for example, 10 kΩ) than the input and output impedances of the lobby intercom 1 or the management room intercom 3. An audio transmission circuit 26b is inserted. That is, a path including one low-frequency passage unit 20a and the first voice transmission circuit 26a corresponds to an individual call path, and a path including the other low-frequency passage unit 20a and the second voice transmission circuit 26b is broadcast simultaneously. It corresponds to the route for use. Further, between the point branching to the low frequency passage 20a and the high frequency passage 20b and one of the low frequency passages 20a, the individual call path and the signal line Ld are connected and not connected. A first changeover switch 29a to be switched is inserted, and the first changeover switch 29a corresponds to a switching unit, and is switched according to control from the CPU 27 of the dwelling unit 2 described later. In the state where the control by the CPU 27 is not performed, the first changeover switch 29a is opened, and the signal line Ld is connected to the broadcast channel and the high-frequency passage unit 20b.

  The audio circuit 24c includes a circuit that converts the two signal lines Ld and the input lines and output lines of the two amplifiers 24a and 24b into two lines and four lines, and demultiplexes the audio signal input from the microphone 21a. Is provided to the signal line Ld, and the audio signal from the signal line Ld separated by the demultiplexing circuit 20 is output to the speaker 21b side. Accordingly, voice signals can be exchanged between the lobby intercom 1 and the management room intercom 3 and the dwelling unit 2 through the signal line Ld, and a visitor uses the lobby intercom 1 and a resident uses the dwelling unit 2. A voice call can be made between the visitor and the resident, and a voice call can be made between the manager and the resident by using the management room intercom 3 and the resident using the dwelling unit 2 by the resident. Become.

  Further, the door phone slave unit 6 is connected to the audio circuit 24c via the slave unit interface circuit 23 and the slave unit connection line L3. The doorphone child unit 6 is arranged at the entrance of each dwelling unit of the apartment house and includes a microphone and a speaker. The child unit interface circuit 23 is a voice bidirectional amplification circuit or a voice for calling with the doorphone child unit 6. A switch circuit or the like for connecting the circuit 24c is provided. Therefore, a telephone call between the door phone slave unit 6 and the dwelling unit 2 is possible. The doorphone slave unit 6 is provided with a call button, and the slave unit interface circuit 23 also has a function of inputting a ringing tone to the voice circuit 24c when the call button is operated on the doorphone slave unit 6 and transmitting it from the speaker 21b. . The power of the door phone slave unit 6 is supplied from the slave unit power supply unit 28a built in the dwelling unit 2 through the power superimposing unit 28b. The power supply superimposing unit 28b is a circuit that increases the impedance with respect to the audio signal transmission band and superimposes the power supply on the slave unit connection line L3. Here, a cable having a sheath different from the transmission line is generally used for the slave unit connection line L3, but a pair of pair wires in the transmission line can also be used.

  In the dwelling unit 2, a liquid crystal display or a CRT is used for the monitor 22. The FM video signal inputted to the dwelling unit 2 through the signal line Ld is separated by the demultiplexing circuit 20, and then inputted to the amplifier 25b via the coupling transformer 25c for balanced-unbalanced conversion, and amplified by the amplifier 25b. After that, frequency demodulation is performed in the FM demodulator 25a. The video signal output from the FM demodulator 25 a is input to the monitor 22, thereby displaying the video on the screen of the monitor 22. That is, since the video of the visitor imaged by the camera of the lobby intercom 1 is displayed on the monitor 22 of the dwelling unit 2, the resident in the dwelling unit can confirm the visitor.

  The dwelling unit 2 is provided with a CPU 27 for controlling an internal circuit, and a control signal transmission / reception circuit (not shown) serving as an interface with the control line is connected to the CPU 27. The control signal transmission / reception circuit has a function of sending the control signal output from the CPU 27 to the control line and delivering the control signal received from the control line to the CPU 27.

  For the control line, the trunk line L1 and the dwelling unit separate line L2 are directly connected in the branching device 7. Therefore, the control signal sent from the management room intercom 3 is transmitted to all the dwelling units 2 connected to the control line. Here, an address (for example, a dwelling unit number) is individually set in the CPU 27 of the dwelling unit 2. For example, by selecting an address in the lobby intercom 1, a control signal (call command) for designating the address is managed It can be transmitted from the room intercom 3 to all the dwelling units 2 via the control line. If the address included in the control signal is its own address, the CPU 27 of the dwelling unit 2 closes the first changeover switch 29a and establishes a communication path between the lobby intercom 1 and the individual call path. The FM demodulator 25a and the monitor 22 are activated to display the visitor's image captured by the camera of the lobby intercom 1 on the monitor 22 of the dwelling unit 2, and further, a ringing tone is generated from the speaker 21b through the audio circuit 24c. It is configured.

  Next, the operation of this embodiment will be described. First, the case where an individual call is made between the lobby intercom 1 and one dwelling unit 2 selected by the lobby intercom 1 will be described. A control signal (calling command) is transmitted from the management room intercom 3 to the dwelling unit 2 selected by the lobby intercom 1 via the control line. In the dwelling unit 2 in which the addresses included in this control signal match, the CPU 27 Closes the first changeover switch 29a in response to the call command and causes the speaker 21b to send out a ringing tone through the voice circuit 24c. Further, in the dwelling unit 2 selected as the lobby intercom 1, the CPU 27 activates the FM demodulator 25a and the monitor 22, and the FM demodulator 25a demodulates the frequency of the FM video signal transmitted via the signal line Ld. A video of a visitor captured by one camera is displayed on the monitor 22. When the resident operates a response button (not shown) of the dwelling unit 2 in response to a call from the lobby intercom 1, the CPU 27 activates the voice circuit 24c.

  On the other hand, in the management room intercom 3, after sending the call command, the CPU turns on a changeover switch (not shown) to connect the communication line La connected to the lobby intercom 1 to the communication line La connected to the trunk line device 4. As a result, a communication path is established between the lobby intercom 1 and the selected dwelling unit 2 so that an individual call can be made, and a visitor captured by the camera of the lobby intercom 1 only in the selected dwelling unit 2 Can be displayed on the monitor 22.

Next, a case where an individual call is made between the management room intercom 3 and one dwelling unit 2 selected by the management room intercom 3 will be described. A control signal (call command) is transmitted from the management room intercom 3 to the dwelling unit 2 selected by the management room intercom 3 via the control line, and in the dwelling unit 2 in which the addresses included in the control signal match, In response to the call command, the CPU 27 closes the first changeover switch 29a and sends a ringing tone from the speaker 21b through the voice circuit 24c. When the resident operates the response button of the dwelling unit 2 in response to the call from the management room intercom 3, the CPU 27 activates the voice circuit 24c. In the management room intercom 3, the CPU turns off a changeover switch (not shown) to disconnect the call line La connected to the lobby interphone 1 from the call line La connected to the trunk line device 4. As a result, a communication path via the individual call path is established between the management room intercom 3 and the selected dwelling unit 2, and individual calls are possible.

  Finally, a case where simultaneous broadcasting is performed to the plurality of dwelling units 2 from the management room intercom 3 installed in the management room of the apartment house will be described. When the manager operates a broadcast start button (not shown) provided on the management room interphone 3, the CPU of the management room interphone 3 connects the plurality of dwelling units 2 to be broadcasted via the control line. A control signal (broadcast start command) is transmitted, and in response to the broadcast start command, the CPUs 27 of all the dwelling units 2 that are the targets of the broadcast start the audio circuit 24c. Further, the CPU of the management room intercom 3 turns off a changeover switch (not shown) to disconnect the call line La connected to the lobby interphone 1 from the call line La connected to the trunk line device 4. As a result, a communication path is established between the management room interphone 3 and the plurality of dwelling units 2 via the simultaneous broadcast path, and simultaneous broadcasting from the management room intercom 3 to the plurality of dwelling units 2 becomes possible.

  As described above, in the case of an individual call, the trunk line L1 is connected to the individual call path of the selected dwelling unit 2 and the broadcast path of all the dwelling units 2, but the combined impedance is the individual call path. Since the voice signal transmission is performed between the devices that are higher than the input impedance and impedance matching between the devices that are the targets of individual calls, a call with high resistance to inductive noise can be performed. On the other hand, in the case of broadcast, the trunk line L1 is connected to the broadcast channel for all the dwelling units 2, but the combined impedance is sufficiently higher than the output impedance of the audio circuit 30, so Even when the number of dwelling units 2 is increased, the attenuation of the audio signal can be suppressed.

(Embodiment 2)
In the present embodiment, the first changeover switch 29a selectively switches between a state in which the signal line Ld is connected to the individual call path and a state in which the signal line Ld is connected to the broadcast path. There are features. Since the basic configuration of the present embodiment is the same as that of the first embodiment, the same components are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 2, the first changeover switch 29a in the present embodiment is inserted between the point B that branches into the low-frequency passage 20a and the high-frequency passage 20b and the low-frequency passage 20a. In accordance with the control, the signal line Ld is selectively switched so as to be connected to either the individual call path or the broadcast path. In a state where the control by the CPU 27 is not performed, the signal line Ld is connected to the broadcast channel and the high-frequency passage unit 20b.

Next, the operation of this embodiment will be described. First, the case where an individual call is made between the lobby intercom 1 and one dwelling unit 2 selected by the lobby intercom 1 will be described. A control signal (calling command) is transmitted from the management room intercom 3 to the dwelling unit 2 selected by the lobby intercom 1 via the control line. In the dwelling unit 2 in which the addresses included in this control signal match, the CPU 27 In response to the call command, the first changeover switch 29a is switched to connect the signal line Ld and the individual call path, and a ringing tone is transmitted from the speaker 21b through the voice circuit 24c. Further, in the dwelling unit 2 selected as the lobby intercom 1, the CPU 27 activates the FM demodulator 25a and the monitor 22, and the FM demodulator 25a demodulates the frequency of the FM video signal transmitted via the signal line Ld. A video of a visitor captured by one camera is displayed on the monitor 22. When the resident operates a response button (not shown) of the dwelling unit 2 in response to a call from the lobby intercom 1, the CPU 27 activates the voice circuit 24c.

  On the other hand, in the management room intercom 3, after sending the call command, the CPU turns on a changeover switch (not shown) to connect the communication line La connected to the lobby intercom 1 to the communication line La connected to the trunk line device 4. As a result, a communication path is established between the lobby intercom 1 and the selected dwelling unit 2 so that an individual call can be made, and a visitor captured by the camera of the lobby intercom 1 only in the selected dwelling unit 2 Can be displayed on the monitor 22. The individual call between the management room intercom 3 and the one dwelling unit 2 selected by the management room intercom 3 is almost the same as the individual call between the lobby intercom 1 and the dwelling unit 2. Since there is, explanation is omitted.

  Next, the case where simultaneous broadcasting is performed to the plurality of dwelling units 2 from the management room intercom 3 installed in the management room of the apartment house will be described. When the manager operates a broadcast start button (not shown) provided on the management room interphone 3, the CPU of the management room interphone 3 connects the plurality of dwelling units 2 to be broadcasted via the control line. A control signal (broadcast start command) is transmitted, and in response to the broadcast start command, the CPUs 27 of all the dwelling units 2 that are the targets of the broadcast start the audio circuit 24c. Further, the CPU of the management room intercom 3 turns off a changeover switch (not shown) to disconnect the call line La connected to the lobby interphone 1 from the call line La connected to the trunk line device 4. As a result, a communication path is established between the management room interphone 3 and the plurality of dwelling units 2 via the simultaneous broadcast path, and simultaneous broadcasting from the management room intercom 3 to the plurality of dwelling units 2 becomes possible.

  As described above, in the case of an individual call, since the simultaneous broadcasting route is not connected to the trunk line L1 in the selected dwelling unit 2, only the individual calling route is connected, and thus a decrease in input impedance of the dwelling unit 2 is suppressed. And compared with Embodiment 1, the number of the dwelling units 2 connected to a system can be increased.

(Embodiment 3)
The present embodiment is characterized in that the dwell unit 2 is provided with a second changeover switch 29b that opens and closes communication channels for individual calls and broadcasts. Since the basic configuration of this embodiment is the same as that of the second embodiment, the same components are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 3, the second changeover switch 29b is inserted between the signal line Ld in the dwelling unit 2 and the point c branched into the low frequency passage 20a and the high frequency passage 20b. According to the control, the communication path between the lobby intercom 1 or the management room intercom 3 and the dwelling unit 2 is switched and corresponds to an opening / closing means. When the control by the CPU 27 is not performed, the second changeover switch 29b is opened, and the communication path between the lobby intercom 1 or the management room intercom 3 and the dwelling unit 2 is not established.

Next, the operation of this embodiment will be described. First, the case where an individual call is made between the lobby intercom 1 and one dwelling unit 2 selected by the lobby intercom 1 will be described. A control signal (calling command) is transmitted from the management room intercom 3 to the dwelling unit 2 selected by the lobby intercom 1 via the control line. In the dwelling unit 2 in which the addresses included in this control signal match, the CPU 27 In response to the call command, the second changeover switch 29b is closed and the first changeover switch 29a is switched to connect the signal line Ld and the individual call path, and a ringing tone is output from the speaker 21b through the voice circuit 24c. Send it out. Further, in the dwelling unit 2 selected as the lobby intercom 1, the CPU 27 activates the FM demodulator 25a and the monitor 22, and the FM demodulator 25a demodulates the frequency of the FM video signal transmitted via the signal line Ld. A video of a visitor captured by one camera is displayed on the monitor 22. When the resident operates a response button (not shown) of the dwelling unit 2 in response to a call from the lobby intercom 1, the CPU 27 activates the voice circuit 24c.

  On the other hand, in the management room intercom 3, after sending the call command, the CPU turns on a changeover switch (not shown) to connect the communication line La connected to the lobby intercom 1 to the communication line La connected to the trunk line device 4. As a result, a communication path is established between the lobby intercom 1 and the selected dwelling unit 2 so that an individual call can be made, and a visitor captured by the camera of the lobby intercom 1 only in the selected dwelling unit 2 Can be displayed on the monitor 22. The individual call between the management room intercom 3 and the one dwelling unit 2 selected by the management room intercom 3 is almost the same as the individual call between the lobby intercom 1 and the dwelling unit 2. Since there is, explanation is omitted.

  Next, the case where simultaneous broadcasting is performed to the plurality of dwelling units 2 from the management room intercom 3 installed in the management room of the apartment house will be described. When the manager operates a broadcast start button (not shown) provided on the management room interphone 3, the CPU of the management room interphone 3 connects the plurality of dwelling units 2 to be broadcasted via the control line. A control signal (broadcast start command) is transmitted, and in response to the broadcast start command, the CPUs 27 of all the dwelling units 2 subject to the simultaneous broadcast close the second changeover switch 29b and the audio circuit 24c. Start up. Further, the CPU of the management room intercom 3 turns off a changeover switch (not shown) to disconnect the call line La connected to the lobby interphone 1 from the call line La connected to the trunk line device 4. As a result, a communication path is established between the management room interphone 3 and the plurality of dwelling units 2 via the simultaneous broadcast path, and simultaneous broadcasting from the management room intercom 3 to the plurality of dwelling units 2 becomes possible.

  As described above, in the case of an individual call, the trunk line L1 is connected only to the individual call path of the selected dwelling unit 2, so that impedance matching between the call target devices becomes more accurate, and thus guidance is performed. Calls with higher noise immunity can be made. Further, by switching the second changeover switch 29b, the communication path is established only with the selected plurality of dwelling units 2, and the communication path with the other dwelling units 2 is not established, so that all dwelling units In addition to simultaneous broadcasting to the machine 2, it is also possible to perform broadcasting to a specific plurality of dwelling units 2.

1 Lobby intercom (common equipment)
2 dwelling unit 3 management room intercom (communication device)
L1 Trunk line L2 Dwelling unit separate line 26a First voice transmission circuit 26b Second voice transmission circuit 29a First changeover switch (switching means)
29b Second changeover switch (opening / closing means)

Claims (1)

A common unit installed at the common entrance of the apartment building and capable of voice input / output, a communication device installed in the management room of the apartment complex and capable of voice input / output, and a common unit installed in each unit of the apartment The communication device and the communication device are connected to each other via a transmission line and, when selected by operating a selection unit included in the common device or the communication device, establishes a communication path with the common device or the communication device. With multiple dwelling units,
The transmission line includes a common line device and a trunk line connected to the communication device, and a separate line connected to each dwelling unit, and the trunk line and the separate dwelling line are generated by at least the operation of the selection means and are used for individual calls. It consists of a control line that transmits a control signal instructing start, and a signal line that transmits a voice signal
The call device instructs a call means for making a call with a dwelling unit via a signal line, a selection means for selecting a dwelling unit as a call partner, and a start of simultaneous broadcasting for a plurality of dwelling units. The broadcast start instruction means transmits the control signal for instructing the start of the individual call to the dwelling unit selected by the selection means via the control line, and the broadcast start instruction means instructs the start of the broadcast. Control means for transmitting a control signal for instructing the start of simultaneous broadcasting to a plurality of target dwelling units via a control line,
The dwelling unit includes a dwelling unit communication means for making a call through the signal line between the common unit device and the communication device, and a common unit device or the communication device and the dwelling unit according to a control signal transmitted through the control line. A dwell unit control means for establishing a communication path with the communication device, and a second unit provided between the dwelling unit separate line and the dwell unit call means and having an impedance matched with the input and output impedances in the common unit device or the call device. A second voice having an impedance higher than the impedance of the input and output in the shared device or the communication device provided between the individual communication path including one audio transmission circuit and the dwelling unit separate line and the dwelling unit communication means A first switching switch that selectively switches between a broadcast path including a transmission circuit, a state in which an individual call path is connected to a separate line, and a state in which the broadcast path is connected to a separate line. And a switching means comprising a second switching switch for opening and closing a communication channel for individual calls and broadcasts, wherein the first switching switch and the second switching switch are connected in series to control the dwelling unit. When the means receives a control signal instructing the start of an individual call, it controls the switching means to connect the individual call route and the dwelling unit separate line, and does not receive the control signal instructing the start of the individual call. When the control signal instructing the start of the individual call or the broadcast is received and the communication path for the individual call or the broadcast is established, the individual call or the broadcast line is established by controlling the opening / closing means. An intercom system for collective housing, characterized in that, when a control signal instructing the start of an individual call or broadcast is not received, the communication means of the individual call and broadcast is opened by controlling the opening / closing means. Temu.

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