JP2000278426A - Intercom for multiple dwelling houses and intercom system for multiple dwelling houses using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the generation of unpleasant sidetone or hauling by matching an impedance generated on a speech line by discriminating a calling source, switching and controlling the impedance of a power source circuit corresponding to the discriminated result. SOLUTION: An intercom 1 for multiple dwelling house is electrically connected to a door phone 3 in a standby state. When a calling is received from a lobby intercom 2, a calling signal is sent from an alarm monitor panel 4 via a multiple transmission line L, a signal processing part 10 receives this signal and discriminates it as being a calling from the lobby intercom 2, a relay RY1 is closed to a side (b), a relay RY2 is closed to a side (a), the intercom 1 is connected to the lobby intercom 2, a capacitor is connected to a power source circuit 13 by closing the relay of an impedance change control means 15, and the impedance generated in the power source circuit 13 is reduced. When calling is received from the door phone 3, however, this call is discriminated from the voltage level drop of a notice line LS' and the electrical connection with the door phone 3 is maintained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intercom for a multi-family housing, which enables a user to talk comfortably without hearing unpleasant side sounds when answering either of the lobby intercom and the doorphone. Also, the present invention relates to an intercom system for a condominium house configured using the intercom.

[0002]

2. Description of the Related Art Conventionally, in an apartment house, an intercom system for an apartment house has been introduced, and an intercom for an apartment house installed in each dwelling unit is used. It responds to calls from the lobby intercom installed at the communal entrance and allows you to talk.

[0003] Such a multi-family intercom system is configured as shown in FIG. 4. A lobby intercom 200 is connected to the multi-family intercom 100 via a multiplex transmission line L and a communication line Ls. An alarm monitoring panel 400 is connected in front of the lobby intercom 200. Further, the intercom 100 for the apartment house is connected to the intercom 300 via the communication line Ls ′.

[0004] In this intercom system for multi-family dwellings, when intercom 100 for multi-family residence receives a call from lobby intercom 200 or intercom 300, it determines the calling source and makes an electrical connection to the determined calling source. Is switched. In order to enable such a switching operation, the apartment house intercom 100 is configured by a CPU or the like, and detects a decrease in the voltage level of the communication line Ls ′ with the signal processing unit 110 that controls the following units. A intercom call detection circuit 111 for detecting a call from the intercom 300, a multiplex transmission control unit 112 for receiving a call signal including the address of the intercom 100, which is transmitted via the multiplex transmission line L,
Switch SW1, diode D, capacitors C1, C
2. A power supply circuit 113 configured to combine the resistors R2 and R3 to supply power to a call circuit of the lobby intercom 200 or the doorphone 300 during a call, and a speaker for calling from the lobby interphone 200 or the doorphone 300. A ringing tone output unit 114 for outputting a ringing tone from SP ', a matching transformer T for matching the impedance generated in the power supply circuit 113, and amplifying the voltage level of the audio signal input from the microphone MI. It includes a transmitting amplifier Amp1, a receiving amplifier Amp2 for amplifying a voltage level of an audio signal to be output from the speaker SP, a handset H including a microphone MI and a speaker SP, and relay circuits RY1 and RY2.

The power supply circuit 113 has two power supplies V1 and V2 connected in parallel via a resistor R3. One power supply V1 has a hook switch SW1 and a diode D connected in series. The other power supply V2 is configured by interposing a parallel circuit of a resistor R1 and capacitors C1 and C2 in series. This intercom 100
In the standby state for the call, the relay RY1 is closed to the a side, and the relay RY2 is closed to the b side, so that the relay RY1 is electrically connected to the doorphone 300. A call signal is transmitted via the multiplex transmission line L, and the multiplex transmission control unit 112 receives the call signal. The signal processing unit 110 receives the call signal, determines that the call is from the lobby intercom 200, and switches the relay RY1. While closing to b side, relay RY2 is closed to a side, and intercom 100 is electrically connected to lobby intercom 200.

On the other hand, when a call is received from intercom 300, the voltage level of communication line Ls' drops, and intercom call detection circuit 111 detects this. It determines that the call is from 300, and maintains the electrical connection with the door phone 300 without operating the relays RY1 and RY2. However, in such a configuration, by matching the impedance generated in the power supply circuit 113 by the matching transformer T, a call can be made with the intercom 300 having a short communication line Ls ′ installed at the entrance of the dwelling unit. At this time, the transmission loss of the voice signal is eliminated so that a comfortable call can be made. However, if the size of the apartment building becomes large and the call line Ls of the lobby intercom 200 becomes long, the static electricity generated on the call line Ls will be generated. Since the capacitance increases and the impedance of the communication line Ls decreases, the impedance cannot be matched with the impedance generated in the power supply circuit 113.
When calling with 0, unpleasant sidetone (your voice is speaker SP
Sound) and howling had occurred.

In FIG. 5, the present inventors conducted experiments on howling and side tone levels when the length of the communication line Ls was changed without changing the impedance generated in the power supply circuit 113. The results are shown. The results show that the howling and sidetone level increase each time the communication line Ls becomes longer. The sidetone cannot be ignored when the length is about 2 km, and howling also occurs when the length becomes about 2.5 km. If you can not ignore it and it becomes 3.5 km or more,
It can be understood that the level of both side sounds and howling has increased, making it difficult to make a comfortable call.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above circumstances, and provides for a case where the length of a communication line with a called party differs greatly between a door phone and a lobby intercom. When a call is received, the source of the call is determined, and according to the determination result, the impedance of the power supply circuit is switched and controlled, thereby matching with the impedance generated in the communication line, and causing unpleasant sidetones and the like. It is an object of the present invention to provide an intercom for a housing complex that can prevent occurrence of howling, and an intercom system for a housing complex using the interphone.

[0009]

According to a first aspect of the present invention, there is provided a multi-dwelling intercom according to the present invention, comprising: a signal processing unit for judging a call source when a call is received; Impedance change control means for varying the impedance of the power supply circuit of the matching transformer in accordance with the call source determined by the signal processing unit.

[0010] In the intercom unit for a multi-family housing according to the second aspect, the impedance change control means, when talking with the lobby intercom, switches the capacitor connected to the power supply circuit of the matching transformer from among capacitors having different capacitances. The configuration can be selected and set in advance. The intercom for a multi-family housing according to the third aspect has a configuration in which a multiplex transmission terminal connected to an alarm monitor panel and a multiplex transmission line is incorporated.

[0011] The intercom for a multi-family housing according to the fourth aspect is a hands-free type including a call switch and a hands-free microphone. According to a fifth aspect of the present invention, there is provided an intercom system for an apartment complex, wherein the intercom for an apartment complex according to any one of claims 1 to 4, the alarm monitor, and the lobby intercom are connected by a multiplex transmission line and a communication line. Have been.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram illustrating an example of a configuration of a main part of an intercom system for an apartment house according to the present invention, and FIG. 2 is a diagram illustrating an example of a specific configuration of an intercom system for an apartment house.

In such an intercom system for a condominium, a lobby intercom 2 is connected to the intercom 1 for a condominium via a multiplex transmission line L and a communication line Ls. Board 4
Is connected. In addition, the intercom 1 for a multiple dwelling house is connected to a door phone 3 via a communication line Ls ′. As shown in FIG.
A signal processing unit 10 configured by a CPU or the like and controlling the following units; a door phone call detection circuit 11 for detecting a call from the door phone 3 by detecting a decrease in the voltage level of the communication line Ls ′; A multiplex transmission control unit 12 for receiving a call signal including an address of the intercom 1 transmitted via the L, a hook switch SW1, a diode D, capacitors C1, C2, and resistors R2, R3 are combined. Then, during a call, a power supply circuit 13 for supplying power to a call circuit of the lobby intercom 2 or the doorphone 3 and a call sound from the speaker SP ′ for a call from the lobby interphone 2 or the doorphone 3 are provided. A matching transformer T for matching the ringing sound output unit 14 and the impedance generated in the power supply circuit 13
, A transmitting amplifier Amp1 for amplifying the voltage level of the audio signal input from the microphone MI, a receiving amplifier Amp2 for amplifying the voltage level of the audio signal to be output from the speaker SP, the microphone MI and the speaker SP And a relay circuit RY1 and RY2.

Here, the signal processing section 10 and the multiplex transmission terminal 12 constitute a multiplex transmission terminal, and the relay circuits RY1 and RY2 constitute switching means. The power supply circuit 13 includes two power supplies V1 and V2 via a resistor R3.
Are connected in parallel. A switch SW1 and a diode D are connected in series to one power supply V1, and a parallel circuit of a resistor R1 and capacitors C1 and C2 is connected in series to the other power supply V2. It is configured by inserting. Note that the power supply V2 may be a ground.

Further, impedance change control means 15
Is connected in parallel with the power supply circuit 13 with the capacitor C1 and the resistor R3.
, And by selectively adding capacitance to the power supply circuit 13, matching with the impedance generated in the communication line Ls is achieved. That is, as the length of the communication line Ls increases, the capacitance generated on the communication line Ls increases with the increase, and the impedance generated on the communication line Ls decreases, and the impedance matching with the impedance generated on the power supply circuit 13 is reduced. Because it can't be removed
The power supply circuit 1 is controlled by the impedance change control means 15.
3 by intentionally adding capacitance to the power supply circuit 13.
The impedance generated in the communication line Ls is reduced by reducing the impedance generated in the communication line Ls.

In order to enable such matching, the impedance change control means 15 has a structure as shown in FIG.
d to operate the capacitor C to be connected to the power supply circuit 13.
a to Cd (here, 0.2 μF and 0.3 μF, respectively)
Capacitors having capacitances of F, 0.4 μF, and 0.5 μF are provided. Note that the number of capacitors is not limited to four. ), The capacitance to be added to the power supply circuit 13 can be selected. When there is a call from the lobby intercom 2, the signal processing unit 10
However, the relay circuit RY3 is closed to connect the selected capacitors Ca to Cd to the power supply circuit 13. Note that the relay circuit RY3 is open in the standby state for calling, and the selected capacitors Ca to C
“d” is not connected to the power supply circuit 13.

When the intercom 1 is in a standby state for a call, the relay RY1 is closed to the a side and the relay RY2 is closed to the b side, so that the intercom 1 is electrically connected to the doorphone 3 and receives a call from the lobby intercom 2. In this case, a paging signal is transmitted from the alarm monitoring panel 4 via the multiplex transmission line L and received by the multiplex transmission control unit 12, so that the signal processing unit 10 receives the While determining that it is a call, closing the relay RY1 to the b side,
The relay RY2 is closed to the side a, and the intercom 1 is electrically connected to the lobby intercom 2. At the same time, the relay circuit RY3 of the impedance change control means 15 is closed, and the capacitor C selected by the user in advance.
a to Cd are connected to the power supply circuit 13.

On the other hand, when a call is received from the intercom 3, the voltage level of the communication line Ls ′ decreases, and the intercom call detection circuit 11 detects this.
Receives this, determines that the call is from the intercom 3, and maintains the electrical connection with the intercom 3 without operating the relays RY1 and RY2. Here, the intercom 1 has a configuration including a handset H including a microphone MI and a speaker SP, but the present invention is not limited to this example, and a hands-free call type including a call switch and a hands-free microphone. It may be.

[0019]

As can be understood from the above description, in the multi-unit intercom according to the first aspect, when a call is received, the signal processing unit discriminates the call source, and determines the call source. In response, the impedance change control means changes the impedance of the power supply circuit of the matching transformer to match the impedance generated in the calling line of the caller, thereby preventing the occurrence of unpleasant sidetones and howling. , You can make a comfortable call.

[0020] In the intercom for a multi-family housing according to the second aspect, the impedance change control means sets the capacitor connected to the power supply circuit of the matching transformer at the time of communication with the lobby intercom, from among capacitors having different capacitances. Since the configuration can be selected and set in advance, the user can arbitrarily select the capacitance to be added to the power supply circuit according to the length of the communication line of the lobby intercom.

According to the third aspect of the present invention, the intercom for a housing complex has a built-in multiplex transmission terminal connected to an alarm monitoring panel and a multiplex transmission line, so that it can be applied to a multiplex transmission type house information panel. it can. The intercom for a multi-family housing according to claim 4 is a hands-free type including a call switch and a hands-free microphone.
Calling is convenient.

According to a fifth aspect of the present invention, there is provided an intercom system for multiple dwelling units, wherein the intercom for multiple dwelling units according to any one of the first to fourth aspects is connected to an alarm monitor and a lobby intercom by a multiplex transmission line and a communication line. Therefore, it is possible to provide an intercom system for a multi-family housing which exhibits the effect of any one of claims 1 to 4.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of a main configuration of an intercom system for an apartment house of the present invention.

FIG. 2 is a diagram showing an example of a specific configuration of an intercom system for an apartment house of the present invention.

FIG. 3 is a diagram illustrating an example of a configuration of an impedance change control unit.

FIG. 4 is a diagram showing an example of a configuration of a main part of a conventional intercom system for a condominium.

FIG. 5 is a diagram showing the results of an experiment on howling and sidetone levels when the length of the communication line is changed without changing the impedance generated in the power supply circuit.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Intercom for collective housing 2 ... Lobby intercom 3 ... Doorphone 4 ... Alarm monitor panel 10 ... Signal processing unit 12 ... Multiplex transmission control unit 13 ... Power supply circuit 15 ... · Impedance change control means L ··· Multiple transmission lines Ls, Ls' · · · Communication line T · · · Matching transformer RY1, RY2, RY3 · · · Relay circuit Amp1 · · · transmission amplifier Amp2 · · · reception amplifier MI: microphone SP: speaker Ca-Cd: capacitor (impedance change control means)

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kiyoshi Shibata 1048 Kadoma Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Works F-term (reference) 5K038 CC12 DD09 EE02 EE15 FF10 FF13

Claims (5)

[Claims] A matching transformer is built-in, and a primary side of the matching transformer is connected to a communication line to which a lobby intercom and a door phone are connected via switching means, and to a speaker via a receiving amplifier, The secondary side of the matching transformer is a signal processing unit for determining a calling source when the intercom receives a call, in a multi-housing intercom configured by connecting a microphone having a transmission amplifier. An intercom for a residential complex, comprising: impedance change control means for varying the impedance of the power supply circuit of the matching transformer according to the call source determined by the signal processing unit. 2. The system according to claim 2, wherein said impedance change control means is capable of selecting and setting in advance a capacitor connected to a power supply circuit of said matching transformer from capacitors having different capacitances during a call with said lobby intercom. The intercom for a dwelling house according to claim 1, wherein: 3. The intercom for a multi-family housing according to claim 1, wherein the multi-transmission terminal is connected to the alarm monitoring panel via a multi-transmission line. 4. A hands-free type having a call switch and a hands-free microphone.
3. The intercom for a multi-family house according to any one of 3. 5. An intercom system for a condominium, wherein the intercom for a condominium according to any one of claims 1 to 4, an alarm monitor, and a lobby intercom are connected by a multiplex transmission line and a communication line.