JPH069250U - Call system for apartments - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a call system for an apartment house in which howling is unlikely to occur during a call. [Structure] In each of the communication lines 4 of a plurality of systems, main normally open contacts 11, 11 are interposed between a branch portion with another communication line 4 and an individual intercom 2 at the first stage.
A control means 12 for controlling opening / closing of the main normally open contacts 11, 11 is connected between the first and the first intercoms 2 and 11. When a specific individual intercom 2 is connected to a specific communication line 4, the specific communication line 4
Line voltage due to a call signal or the like is generated, the control means 12 detects the line voltage and closes only the main normally open contacts 11 and 11 provided in the specific call line 4. Then, only the specific communication line 4 is made conductive.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a call system for a housing complex, which includes a collective intercom installed at a collective entrance of a collective housing and a plurality of individual intercoms.

[0002]

[Prior art]

 FIG. 4 is a diagram showing a configuration of a conventional call system for a housing complex.

As shown in FIG. 4, a conventional call system for an apartment building has an intercom 1 installed at an entrance of an apartment such as a lobby of a condominium and a plurality of individual intercoms 2 installed at each dwelling unit. And is configured. Three lines of call lines 4 for bidirectionally transmitting a signal such as a call voice (hereinafter referred to as a "call signal") are branched and connected to the collective intercom 1. However, the communication line 4 is composed of a pair of two single-wire cables 4a, 4a. Also, one to a plurality of individual intercoms 2 are connected to each call line 4. However, the individual intercom 2 has built-in sub normally open contacts 5 and 5, and can be connected to the communication line 4 only when the sub normally open contacts 5 and 5 are closed. There is. In the present specification, “line connection” means connection with the telephone line 4 in a state capable of transmitting and receiving signals, and “connection” does not matter whether or not the “line connection” is present. Further, all the individual intercoms 2 and the collective intercom 1 are connected by an extension signal line 3 that transmits an extension signal for calling a specific dwelling unit.

When the extension number of the individual intercom 2 of the specific dwelling unit to be called is designated by the numeric keypad 1a or the like in the collective intercom 1, the collective intercom 1 is unique to the extension number of the individual intercom 2 of the specific dwelling unit. The extension signal is transmitted through the extension signal line 3. The individual intercom 2 of the designated specified dwelling unit responds only to the unique extension signal assigned to itself, and excites the built-in self-holding relay coil 6 to activate the built-in sub normally open contacts 5 and 5. Close it. As a result, the individual intercom 2 of the particular dwelling unit is connected to the call line 4 so that a call signal can be transmitted to and received from the collective intercom 1. When the telephone call is terminated by the operation of the handset 7 after that, the self-holding relay coil 6 is demagnetized and the sub normally open contacts 5 and 5 are opened to disconnect the line from the telephone line 4.

[0005]

[Problems to be Solved by the Invention]

 However, in the call system for housing complex represented by the above-mentioned conventional example, electrostatic capacitances C1, C2 and C3 are generated in each of the plurality of call lines 4 according to the length thereof. The larger the value of the capacitance, the more easily howling occurs during a call, which deteriorates the quality of the call. Therefore, it is necessary to make the capacitance as small as possible. However, in the case of the call system for collective housing of the conventional example, since the call lines 4 of a plurality of systems are branched and connected, all the call lines are provided between the set intercom 1 and the individual intercom 2 of the specific dwelling unit. Since the electrostatic capacitances of 4 are connected in parallel, a very large electrostatic capacitance is generated between the collective intercom 1 and the individual intercom 2 of the specific dwelling unit, so howling occurs during a call between the two. There was a problem that could not be ignored that was likely to occur.

The present invention has been made in view of the above problems, and an object of the present invention is to reduce electrostatic capacity generated in a communication line between a collective intercom and an individual intercom of a specific dwelling unit. Is to provide a call system for multi-family housing that makes it difficult to generate howling during a call.

[0007]

[Means for Solving the Problems]

 The present invention, which was made to solve the above-mentioned problems, is a call system for an apartment house that includes an intercom installed at the entrance of an apartment house and a plurality of individual intercoms. In an integrated residential communication system in which a communication line is branched and connected to the collective intercom, and the plurality of individual intercoms are connected to the plurality of communication lines, the communication lines are connected to the plurality of communication lines. A control means for controlling the switching means, which is provided with a switching means for connecting or disconnecting, and controls only the switching means provided in the communication line by detecting the line voltage of the communication line, It is characterized in that it comprises the control means for bringing only one into a conducting state.

[0008]

[Action]

 When a specific individual intercom is connected to a specific communication line, a line voltage due to a call signal or the like is generated in the specific communication line. The control means detects the line voltage. , And controls only the switching means provided in the specific communication line to bring only the specific communication line into the conductive state. At this time, since the call line of the other system is cut off, the call line of the other system is not connected to the specific call line between the individual intercom of the specific dwelling unit and the collective intercom. Capacitance generated between the intercom and the individual intercom of the specific dwelling unit can be reduced as compared with the conventional one.

[0009]

【Example】

 The present invention will be described below with reference to the drawings showing an embodiment thereof. The same components as those of the conventional example are designated by the same reference numerals.

FIG. 1 is a system configuration diagram showing an embodiment according to the present invention. The call system for a housing complex according to the embodiment of the present invention is configured to have the same collective intercom 1 as the conventional one and a plurality of the individual intercoms 2. The collective intercom 1 receives a call signal. Two or more communication lines 4 (a pair of two single-wire cables 4a and 4a) for bidirectional transmission are branched and connected in a plurality of systems (three systems in the embodiment), and each communication line 4 has one or a plurality of lines. Although the individual intercom 2 is connected, the call system for collective housing is further configured to include a call switching means 10 for selectively connecting or disconnecting the call lines 4 of the plurality of systems. Further, as in the conventional case, all the individual intercoms 2 and the collective intercoms 1 are connected by an extension signal line 3 for transmitting an extension signal for calling a specific dwelling unit.

In each of the communication lines 4 of the plurality of systems, main normally open contacts 11 and 11 (corresponding to switching means) are interposed between a branch part with another communication line 4 and the individual intercom 2 at the first stage. Further, the main normally open contacts 11, 11 are controlled to be opened and closed between the main normally open contacts 11, 11 and the first-stage individual intercom 2 for each of the plurality of communication lines 4 of the systems. The control means 12 is connected. The main normally-open contacts 11, 11 and the control means 12 constitute a system control means 17 for controlling conduction or interruption of each system of the call transmission line 4, and the call switching means 10 controls the system. Means 17 are provided for a plurality of lines of the communication line 4.

In the control means 12, 13 is a detection circuit. The detection circuit 13 detects a line voltage such as a call signal applied to the call line 4 by closing the sub normally open contacts 5 and 5 built in the individual intercom 2. The detection circuit 13 makes the transistor 14 conductive and excites the exciting coil 15 only while detecting the line voltage. The control means 12 closes the main normally open contacts 11, 11 only while the exciting coil 15 is in an excited state, that is, while the line voltage is being detected. Further, when the line voltage is no longer detected by the detection circuit 13, the transistor 14 is cut off, the exciting coil 15 is demagnetized, and the main normally open contacts 11, 11 are opened.

The multi-story residential call system configured as described above operates as follows. That is, during normal times when there are no visitors, the sub normally open contacts 5 and 5 of all the individual intercoms 2 are open, and all the individual intercoms 2 are not connected to the call line 4. When the extension number of the individual intercom 2 of the specific dwelling unit that the visitor or the like wants to call is designated by the numeric keypad 1a or the like on the collective intercom 1, the collective intercom 1 corresponds to the extension number of the individual intercom 2 of the specific dwelling unit. A unique extension signal is transmitted through the extension signal line 3. The individual intercom 2 of the specified specific unit excites the built-in self-holding relay coil 6 in response to only the peculiar extension signal assigned to the self-intercom 2, and the built-in sub normally open contacts 5 and 5 are activated. Close it. Thereby, the individual intercom 2 of the specific dwelling unit is connected to the call line 4. At this time, the individual intercom 2 other than the specific dwelling unit does not respond to the unique extension signal and is not connected to the call line 4. The control means 12 of the communication line 4 to which the individual intercom 2 of the specific dwelling unit is line-connected, the control means 12 of the communication line 4 applied by the individual intercom 2 of the specific dwelling unit by closing the sub normally open contacts 5 and 5. The line voltage is detected, the built-in exciting coil 15 is excited, and the main normally open contacts 11, 11 are closed. When the main normally open contacts 11 and 11 are closed, the communication line 4 becomes conductive. Therefore, the individual intercom 2 of the specific dwelling unit and the collective intercom 1 are connected to each other via the communication line 4 and are connected to each other. The call is ready. At this time, the communication lines 4 other than the communication line 4 1 to which the individual intercom 2 of the specific dwelling unit is connected are in the cutoff state by opening the main normally open contacts 11, 11. When the call is ended by operating the handset 7 thereafter, the sub normally open contacts 5 and 5 built in the individual intercom 2 of the specific dwelling unit are opened, and the control means 12 causes the individual intercom 2 to operate. Since the line voltage is no longer detected, the main normally open contacts 11, 11 are opened and the communication line 4 is cut off.

In the present invention, if the call switching means 10 is housed in one box as shown in FIG. 2 and configured as an integrated device unit, a call system for an existing housing complex shown in a conventional example is provided. By attaching the device unit, the call system for housing complex according to the embodiment of the present invention can be easily changed. Further, as shown in FIG. 3, if the system control means 17 is housed in one box and configured as an integrated device unit and provided in each of the communication lines 4 of the plurality of systems, Regardless of the number of call lines 4 of the call system, by installing the equipment unit for each call line in the existing call system for collective housing shown in the conventional example, it is easy to call for collective housing according to the embodiment of the present invention. Can be changed to the system.

[0015]

[Effect of device]

 According to the present invention constructed as described above, only the specific communication line to which the individual intercom of the specific dwelling unit that communicates with the collective intercom is connected and the communication line of the other system is cut off. Since the line is not connected to the call line of, the capacitance generated between the collective intercom and the individual intercom of the specified dwelling unit is less than that of the conventional system because the influence of the call lines of other systems is eliminated. Therefore, howling is reduced during the call, and thus howling is unlikely to occur during a call.

[Brief description of drawings]

FIG. 1 is a system configuration diagram showing an embodiment of the present invention.

FIG. 2 is a system configuration diagram showing an embodiment of the present invention.

FIG. 3 is a system configuration diagram showing an embodiment of the present invention.

FIG. 4 is a system configuration diagram showing a conventional example.

[Explanation of symbols]

 1 Collective intercom 2 Individual intercom 4 Call line 5 Sub normally open contact 11 Main normally open contact (switching means) 12 Control means

Claims (1)

[Scope of utility model registration request] 1. A call system for a housing complex comprising a collective intercom installed at a collective entrance of a collective house and a plurality of individual intercoms, wherein a plurality of communication lines are branched and connected to the collective intercom. Then, in a communication system for a housing complex in which the plurality of individual intercoms are connected to each of the plurality of communication lines, the plurality of communication lines includes switching means for connecting or disconnecting the communication lines. A control means for controlling the switching means, the control means for detecting a line voltage of the call line and controlling only the switch means provided in the call line to bring only the call line into a conductive state. A call system for a housing complex, which is characterized by comprising.