JP2002261954A - Interphone system for multiple dwelling house - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain speech quality equivalent to 2 person speech, in the case of 2+n person speech. SOLUTION: This interphone system is constituted by connecting a hall set 6, a plurality of living room base units 1 and a bus I/F module 3 for supplying power source with a common bus 5. The hall set 6 consists of a microphone M2 with which a plurality of switch modules 4 for selecting and calling a living room base unit are connected, and a speech module 2 for performing speech with a speaker S via amplifier 24, 22. The living room base unit 1 which is selected and called by the hall set performs speech to a hall subsidiary unit, with a microphone M1 and a speaker R via amplifiers 14, 12. The living room base unit and the hall set are provided with a hybrid balance circuits 13 and 22 for 2 wire/4 wire conversion between the common bus and the microphone and speaker, gain control circuits 11 and 21 for controlling amplifier gains, and control circuits 18 and 28 for detecting a 2 person speech state or a 2+n person speech state (n is an integer equal to 1 or higher) and controlling the hybrid balance circuit and the gain control circuit, respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intercom system for a multi-family house, and more particularly to an intercom system for a multi-family house that can provide the same call quality as a two-party call even in a 2 + n-party call.

[0002]

2. Description of the Related Art Conventionally, as this kind of intercom system for apartment houses, an intercom system for apartment houses as shown in FIG. 4 has been proposed. The intercom system for a condominium includes an entrance device 106 installed at an entrance of the condominium, a parent device 101 installed in each of a plurality of dwelling units of the condominium,.
, And a common bus 105 that connects the plurality of living room master units 101,..., And a power supply for supplying DC power to the entrance machine 106 and the plurality of living room master units 101,. And a bus I / F module 103 having a circuit 131.

The entrance unit 106 is connected to a common bus 105 and a dedicated power line 107 for calling and talking, and a plurality of switch modules connected to the calling module 102 and for selecting a main unit of a living room. 1
04,... Call module 1
Reference numeral 02 denotes an interface circuit 126 connected to the common bus 105 for multiplexing / demultiplexing various signals, a hybrid balance circuit 123 connected to the interface circuit 126 to perform 2-wire / 4-wire conversion, and a hybrid balance circuit 1
Microphone M connected to microphone 23 via microphone amplifier 124
102, a speaker S connected to the hybrid balance circuit 123 via the loudspeaker amplifier 122, a control circuit 128 connected to the interface circuit 126 via the data transmission / reception circuit 127, and a power supply circuit connected to the power line 107. 129. The control circuit 128 includes a microphone amplifier 124 and a loudspeaker amplifier 1.
22 are connected. The switch module 104
Switch control circuit 14 to which call switch 141 is connected
The switch control circuit 143 is connected to the control circuit 128 of the communication module 102. Also,
The switch module 104 has an illumination circuit 142. Note that the other plurality of switch modules 104,.
Indicates that the switch control circuits 143 are connected in series.

The parent room 101 is an interface circuit 1 connected to a common bus 105 for multiplexing and separating various signals.
16 and 2 wires /
A hybrid balance circuit 113 for performing 4-wire conversion, a microphone M101 of a handset connected to the hybrid balance circuit 113 via a microphone amplifier 114, and a receiver R of a handset connected to the hybrid balance circuit 113 via a loudspeaker amplifier 112; The control circuit 118 includes a control circuit 118 connected to the interface circuit 116 via the data transmission / reception circuit 117, and a power supply circuit 119 connected to the power line 107. The control circuit 118 includes the microphone amplifier 114 and the loudspeaker amplifier 11.
2 are connected to each other.

In the intercom system for an apartment house constructed as described above, when a call operation is performed by the call switch 141 of the switch module 104 that can call the room master device 101 of a predetermined dwelling unit at the entrance machine 106, a call data signal is generated. Call module 102 and common bus 1
The data is transmitted to the selected parent device 101 via the network 05.
Based on the call data signal, the control unit 118 of the living room master unit 101 sounds a calling speaker to notify the resident of the call from the entrance unit 106. When the resident performs a call operation on this call using the handset of the room master device 101, a communication path is formed between the selected room room master device 101 and the entrance device 106.

The hybrid balance circuit constants of the hybrid balance circuit 113 of the living room master unit 101, the amplifier gain constants of the amplifiers 114 and 112, and the entrance machine 10
The hybrid balance circuit constants of the hybrid balance circuit 123 and the amplifier gain constants of the amplifiers 124 and 122 are set for two-party communication to ensure good communication quality.

[0007]

However, in such a conventional intercom system for a condominium, since the hybrid balance circuit constant and the amplifier gain constant are set exclusively for two-party communication, for example, three-party communication is performed. In this case, there has been a problem that the communication quality as high as that of two-way communication cannot be obtained because the hybrid balance of the communication circuit is lost and the amplifier gain is insufficient.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned difficulties, and it is an object of the present invention to provide an intercom system for a multi-family housing that can provide a call quality equivalent to a two-party call even in a 2 + n-party call.

[0009]

According to the present invention, there is provided an intercom system for a multi-family residence, which is connected to a plurality of switch modules for selecting and calling a parent unit of a living room, and having a microphone and a speaker via an amplifier. And a channel with a call module to perform
A common bus is used for a plurality of living room main units, one of which is called by a microphone and a speaker through an amplifier to communicate with an entrance unit, and a bus I / F module for supplying power to the entrance unit and a plurality of main room units. An intercom system for a multi-family housing configured by connecting a bus, wherein a parent room unit and a front door unit use a hybrid balance circuit for converting between a common bus, a microphone, and a speaker into two or four wires, and an amplifier gain of an amplifier. Gain control circuit to control, two-party call or 2 + n between one or 1 + n (n is an integer of 1 or more) living room masters
And a control circuit for detecting any one of the telephone conversation states (n is an integer of 1 or more) and controlling the hybrid balance circuit and the gain control circuit.

According to the intercom system for a condominium, each control circuit controls each hybrid balance circuit and the gain control circuit in accordance with the number of living room master units that are in a talking state with the entrance device. 2 in the state
Call quality comparable to that of multi-user calls can be secured.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment to which the intercom system for an apartment house of the present invention is applied will be described below with reference to the drawings.

As shown in FIG. 3, the intercom system for an apartment house according to the present invention has an entrance machine 6 installed at the entrance of an apartment house and a living room master unit 1 installed in a plurality of dwelling units of the apartment house. , And a common bus 5 that connects the entrance device 6 and the plurality of living room master devices 1,..., And the entrance device 6 and the plurality of living room master devices 1 via the common bus 5.
..Bus I / F module 3 for supplying DC power
It is composed of

The entrance machine 6 is connected to the common bus 5 and
It is composed of a call module 2 for making a call, and a plurality of switch modules 4 connected to the call module 2 and for selecting a parent unit in the room.

As shown in FIG. 1, the communication module 2 has a multiplexing / demultiplexing circuit 25 connected to the common bus 5 via an impedance upper circuit 26 for increasing the input impedance to a high impedance. 2
5 is a hybrid balance circuit 2 that performs 2-wire / 4-wire conversion
3 and a data transmitting / receiving circuit 27 connected to the control circuit 28
And a power supply circuit 29 for supplying power to each circuit of the entrance machine 6 are connected to each other. On the 4-wire side of the hybrid balance circuit 23, a microphone M2 is connected via a microphone amplifier 24, and a speaker S is connected via a loudspeaker amplifier 22, and the microphone amplifier 24 and the loudspeaker amplifier 22 are connected to amplifiers of these amplifiers. It is connected to a gain control circuit 21 for controlling the gain. This gain control circuit 2
1 and the hybrid balance circuit 23 are connected to a control circuit 28, and this control circuit 28
Detects any one of + n (n is an integer of 1 or more) two-party calls or 2 + n-party calls (n is an integer of 1 or more) between the parent devices 1 and hybridizes according to the call status The balance circuit 23 and the gain control circuit 21 are controlled.
Specifically, the control circuit 18 detects whether the call is a two-party call or a 2 + n-party call based on the number of call data signals generated by a call operation by a call switch 41 of the switch module 4 described later.

As shown in FIG. 1, the switch module 4 includes a switch control circuit 4 to which a call switch 41 is connected.
3 and the switch control circuit 43 is connected to the control circuit 28 of the communication module 2. The switch module 4 also has an illumination circuit 42 for illuminating the switch module 4. In each of the other plurality of switch modules 4,..., The switch control circuits 43 are connected in series.

As shown in FIG. 1, the living room master unit 1 has a multiplexing / demultiplexing circuit 15 connected to the common bus 5 via an impedance upper circuit 16 for increasing the input impedance to a high impedance. The circuit 15 includes a hybrid balance circuit 13 that performs 2-wire / 4-wire conversion,
A data transmission / reception circuit 17 connected to the control circuit 18 and a power supply circuit 19 for supplying power to each circuit of the parent device 1 are connected to each other. On the 4-wire side of the hybrid balance circuit 13, a microphone M1 of the handset HS (FIG. 3) via the microphone amplifier 14 and a receiver (speaker) R of the handset HS (FIG. 3) via the loudspeaker amplifier 12, respectively. The microphone amplifier 14 and the loudspeaker amplifier 12 are connected to a gain control circuit 11 that controls the amplifier gain of these amplifiers. The gain control circuit 11 and the hybrid balance circuit 13 are connected to a control circuit 18. The control circuit 18 is connected to the entrance device 6 and one or 1 + n (n is an integer of 1 or more) living room master devices 1.
Any one of a two-party call and a 2 + n-party call state (n is an integer of 1 or more) is detected, and the hybrid balance circuit 13 and the gain control circuit 11 are controlled in accordance with the detected call state. Specifically, the control circuit 18 detects whether the call is a two-party call or a 2 + n-party call based on the number of call data signals generated by the call operation of the call switch 41 of the switch module 4 of the entrance device 6.

As shown in FIG. 1, the bus I / F module 3 includes an impedance upper circuit 32 connected to a DC power supply via a power supply circuit 31 to increase the output impedance to a high impedance.

The microphone amplifier 24 of such an entrance machine 6
The loudspeaker amplifier 22, the gain control circuit 21, the hybrid balance circuit 23 and the control circuit 28, the microphone amplifier 14, the loudspeaker amplifier 12, and the gain control circuit 1 of the parent room 1
1. Hybrid balance circuit 13 and control circuit 18
For example, as shown in FIG. 2, the specific circuit configurations of the microphone amplifiers 14 and (24) and the loudspeaker amplifiers 12 and (2)
2) uses an amplifying circuit composed of an operational amplifier, and a hybrid balance circuit 13,
(23) shows the microphone amplifier 14 and (2)
4) A variable resistor VR1 and a resistor R1 for generating a feedback audio voltage level fed back from the microphone amplifier 14 to the loudspeaker amplifier 22, a variable resistor VR2 for generating a feedback audio voltage level fed back from the (24), and a termination described later. It is constituted by a resistor R2. The input terminals of the microphone amplifiers 14 and (24) are connected to the microphones M1 and (M2), and the output terminals are the variable resistors VR of the hybrid balance circuit 13 and (23).
2 and the other end of the variable resistor VR2 is connected via a common bus 5 to a terminating resistor R2 based on a counterpart device (room master). Microphone amplifier 14, (24)
One end of the variable resistor VR1 is connected to a connection point between the variable resistor VR2 and the other end of the variable resistor VR1 is connected to a resistor R1 whose terminal is grounded. The connection point between the variable resistor VR1 and the resistor R1 is connected to the-
The positive input terminals of the loudspeaker amplifiers 12 and (22) are connected to a connection point between the variable resistor VR2 and the common bus 5. The output terminal of the loudspeaker amplifier is receiver R,
(Speaker S). Also, the control circuit 1
8, (28) is the hybrid balance circuit 13, (2
The control inputs of the variable resistors VR1 and VR2 of 3) are connected to the gain control circuits 11 and (21).

Next, the control operation of the gain control circuit, the hybrid balance circuit and the control circuit will be described based on the parent device 1 in the room. Note that the resistance R1,
The resistance value of the terminating resistor R2 based on the counterpart device (room master) is 100Ω.

For example, in the case of a two-party call, if the audio voltage level from the microphone M1 is 8 mV, the gain control circuit 1
1 increases the amplification gain of the microphone amplifier 14 to 10 times in the two-party communication control operation by the control circuit 18, so that the audio voltage level 8 mV is amplified to 80 mV and output to the hybrid balance circuit 13. The hybrid balance circuit 13 controls the variable resistors VR1 and V
Since both the resistance values of R2 are adjusted to 100Ω, the feedback voice voltage level input from the microphone amplifier 14 to the loudspeaker amplifier 12 via the variable resistor VR2 and the feedback voice voltage level input via the variable resistor VR1 become The voice voltages coincide with each other, that is, the same phase audio voltage level of 40 mV is input. Since the audio signals of the same phase and the same level are input to the + and-input terminals of the loudspeaker amplifier 12, the audio signal from the microphone M1 of the own room master unit 1 is not output to the receiver R. On the other hand, since the audio signal from the microphone M2 of the entrance device 6 is input to the loudspeaker amplifier 12 via the hybrid balance circuit 13, the audio signal can be input to the receiver R. Therefore, it is possible to eliminate the collapse of the hybrid balance and the lack of the amplifier gain in the communication circuit.

In the case of a three-party call, the parent device 1
Therefore, the terminating resistance R2 based on the parent device 1 is 50Ω, and the audio voltage level from the microphone M1 is 8 m.
V, the gain control circuit 11 sets the amplification gain of the microphone amplifier 14 to 30 by the three-party call control operation by the control circuit 18.
Therefore, the audio voltage level of 8 mV is amplified to 240 mV and output to the hybrid balance circuit 13. The hybrid balance circuit 13 adjusts the resistance value of the variable resistor VR1 to 200Ω by the three-party communication control operation by the control circuit 18, so that the feedback audio voltage level input from the microphone amplifier 14 to the loudspeaker amplifier 12 via the variable resistor VR2 is ,
The feedback audio voltage levels input via the variable resistor VR1 match, that is, the audio voltage levels of the same phase are 8
The input will be 0 mV. Since the audio signals of the same phase and the same level are input to the + and-input terminals of the loudspeaker amplifier 12, the audio signal from the microphone M1 of the own room master unit 1 is not output to the receiver R. On the other hand, the audio signal from the microphone M2 of the entrance device 6 is input to the loudspeaker amplifier 12 through the hybrid balance circuit 13 because the same audio voltage level as in the two-way call is input to the receiver R.
Since the same audio voltage level as that of the two-party call can be input to the communication circuit, it is possible to eliminate the hybrid balance breakdown and the lack of the amplifier gain of the communication circuit.

In the entrance unit 6, the microphone amplifier 24, the loudspeaker amplifier 22, the gain control circuit 21, the hybrid balance circuit 23, and the control circuit 28 have the same configuration as that of the parent room unit 1. Shortage can be resolved.

In the intercom system for a condominium constructed as described above, when the call operation is performed by the call switch 41 of the switch module 4 which can call the room master unit 1 of the predetermined one dwelling unit at the entrance machine 6, the call data is obtained. The signal is transmitted to the selected parent device 1 via the communication module 2 and the common bus 5. The control circuit 18 of the room master unit 1 generates a call speaker CS based on a call data signal.
Make the ringer sound. When the resident performs a call operation with the handset HS of the living room master unit 1 in response to this call, a communication path is formed between the selected living room master unit 1 and the entrance unit 6, and the handset HS of the living room master unit 1 and the entrance are connected. Microphone M2 of machine 6,
A two-party call can be made with the speaker S by voice signals. At this time, the control circuit 18 of the parent room unit 1 controls the hybrid balance circuit 13 and the gain control circuit 11 for two-party communication based on the call data signal, and the control circuit 28 of the entrance device 6 also controls the two circuits based on the call data signal. The hybrid balance circuit 23 and the gain control circuit 21 are controlled for a user call. As a result, the hybrid balance circuit constant and the amplifier gain constant can be changed for two-party communication, so that it is possible to eliminate the hybrid balance breakdown and the insufficient amplifier gain of the communication circuit.

When a call operation is performed by each of the call switches 41 of the switch modules 4 and 4 that can call the room master units 1 and 1 of the predetermined two dwelling units at the entrance device 6, each call data signal is transmitted to each of the call modules. It is transmitted to each living room master unit 1, 1 selected via the common bus 2 and the common bus 5. Each control circuit 18 of these living room master units 1 and 1 emits a ringing sound at each calling speaker CS based on the calling data signal.
When each resident performs a call operation using the handset HS of each room master unit 1 in response to this call, a communication path is formed between the selected two room master units 1 and 1 and the entrance unit 6, and each room master unit Machine 1
, And the microphone M2 and the speaker S of the entrance device 6 allow a three-party call using voice signals. At this time, the control circuit 18 of the living room master unit 1 uses the hybrid balance circuit 13 for three-party communication based on the number of call data signals.
And the gain control circuit 11 and the control circuit 2 of the entrance machine 6
8 also controls the hybrid balance circuit 23 and the gain control circuit 21 for three-party communication based on the number of call data signals. As a result, the hybrid balance circuit constant and the amplifier gain constant can be changed for three-party communication, so that it is possible to eliminate the hybrid balance collapse and the amplifier gain shortage in the communication circuit.

In the intercom system for a multi-family house having a stable communication quality function irrespective of the number of living room master units which are in a communication state with the entrance device, the stabilized DC power supply is provided by the impedance of the bus I / F module 3. Upper circuit 32
Are supplied to the power supply circuit 29 and the power supply circuit 19 through the impedance upper circuit 26 of the entrance device 6 and the impedance upper circuit 16 of the plurality of living room master devices 1,. When power is supplied to the common bus 5 by the bus I / F module 3, power is supplied through the impedance upper circuit 32 that performs a constant current operation, and the power is supplied to the entrance machine 6. When receiving power, the impedance upper circuit 26 of the entrance device 6 performs constant current operation when the impedance upper circuit 16 of the room master device 1 receives power from the room master device 1, so that the common bus 5 , A bus I / F module 3, an entrance device 6, and a plurality of living room master devices 1, ...
Can be prevented from lowering the AC impedance of the common bus 5. Therefore, the transmission loss of the common bus 5 can be reduced, and the transmission state of the data signal and the audio signal can be stabilized.

As shown in FIG. 1, a multi-unit intercom system having a call quality function comparable to that of a two-party call even in the 2 + n-party call state, as shown in FIG. Circuit 32
Are supplied to the common bus 5 from the power supply circuit 29 and the power supply circuit 19 through the impedance upper circuit 26 of the entrance device 6 and the impedance upper circuit 16 of the plurality of living room master devices 1,. Since the power is received as power at the time of reception, when power is supplied to the common bus 5 by the bus I / F module 3, power is supplied through the impedance upper circuit 32 that performs a constant current operation, and When the power is received, the impedance upper circuit 26 of the entrance device 6 performs a constant current operation when the impedance upper circuit 16 of the living room master device 1 performs the constant current operation when the power is received by the living room master device 1. Bus I / F at 5
Module 3, entrance machine 6 and multiple room master machines 1, ...
.. Can be prevented from lowering the AC impedance of the common bus 5. Therefore, the transmission loss of the common bus 5 can be reduced, and the transmission state of the data signal and the audio signal can be stabilized.

[0027]

As is apparent from the above description, according to the intercom system for a multiple dwelling house of the present invention, each control circuit is provided with a hybrid balance circuit and a hybrid balance circuit in accordance with the number of living room master units which can communicate with the front door. Since the gain control circuit is controlled, it is possible to ensure the same call quality as the two-party call even in the 2 + n-party call state.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a preferred embodiment of a multi-dwelling intercom system according to the present invention.

FIG. 2 is a specific circuit diagram applied to the entrance device and the parent device of the room intercom system of the present invention.

FIG. 3 is an overall configuration diagram showing an intercom system for an apartment house of the present invention.

FIG. 4 is a block diagram showing a configuration of a conventional intercom system for a condominium.

[Explanation of symbols]

 1 ···· Living room master unit 2 ····· Call module 3 ····· Bus I / F module 4 ····· Switch module 5 ····· Common bus 6 ····· Entrance machine 11, 21 ... Gain control circuit 13, 23 ... Hybrid balance circuit 12, 22 ... Loudspeaker amplifier 14, 24 ... Microphone amplifier 18, 28 ... ..Control circuits M1, M2... Microphones S.... Speakers R.... Receivers (speakers)

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Tatsu Shinozaki 2-18, Jinnocho, Atsuta-ku, Nagoya-shi, Aichi F-term in Aiphone Co., Ltd. (reference) 5K038 AA07 CC05 DD03 EE03

Claims (1)

[Claims] 1. A plurality of switch modules (4,...) For selecting and calling a parent device of a living room are connected to a microphone (M).
2) An entrance machine (6) composed of a communication module (2) for making a conversation with the speaker (S) via the amplifiers (24, 22), and one aircraft selected and called by the entrance machine Are microphones (M1) and speakers (R) are amplifiers (14, 1
A plurality of living room master units (1,...) Communicating with the entrance machine via 2), and a bus I / F module (3) for supplying power to the entrance room and the plurality of living room master units. And an intercom system for a condominium, which is connected to a common bus (5) by a bus, wherein the living room master unit and the entrance device connect the common bus, the microphone, and the speaker with two or four wires. A hybrid balance circuit (13, 23) for conversion, a gain control circuit (11, 21) for controlling the amplifier gain of the amplifier, between the entrance device and one or 1 + n (n is an integer of 1 or more) living room master units And a control circuit (18, 28) for detecting any one of a two-party call state and a 2 + n person talk state (n is an integer of 1 or more) and controlling the hybrid balance circuit and the gain control circuit. Collection characterized by that Intercom system for housing.