JP2002354135A - Multiple dwelling house hands-free interphone system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multiple dwelling house hands-free interphone system at a suppressed cost, which allows a living room master unit to easily discriminate a caller and a reception/transmission state, enhances the speech quality at establishment of a hands-free speech. SOLUTION: Each of living room master units 2a, 2b, etc., is provided with a living room master unit CPU 20 that allows a living room master unit speaker 21 to emit a call tone when called at the central entrance unit 1, detects an operation of a speech button 23 to establish a speech with the central entrance unit 1 with a resident in a house confirming the ringer tone of the living room master unit speaker, and transmits a speech control signal to a changeover circuit 24 that switches a speech path to the central entrance unit 1 to establish the speech and with an automatic speech circuit 25 having a signal level comparison section 25a that compares a signal level of a received signal from the central entrance unit 1 with a signal level of a transmission signal from the living room master unit when the speech between the central entrance unit 1 and the living room master unit is established by the speech control signal and having reception/transmission state changeover sections 25b, 25c that switch the reception state and the transmission state by taking precedence of the higher signal level over the other signal level.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hands-free intercom system for a dwelling house, and more particularly to a hands-free intercom system connected between a dwelling unit and a parent unit or a dwelling unit and a parent unit connected via a controller. And a hands-free intercom system capable of making a call / hands-free call between the same.

[0002]

2. Description of the Related Art Conventionally, as a hands-free intercom system of this type, a lobby intercom,
Japanese Patent Application Laid-Open No. Hei 9-112253 that prevents howling from occurring during a call established between a base unit of a dwelling unit and an alarm monitor panel and between a base unit of a dwelling unit and a slave unit (slave unit), thereby ensuring practical communication quality. A hands-free communication system for an apartment house described in Japanese Unexamined Patent Publication (Kokai) No. H10-26083 has been proposed.

[0003]

However, in the conventional hands-free call system for a collective housing, a conventional example of a hands-free communication system for a dwelling unit except for a hands-free call established between a dwelling base unit and a door phone slave unit (slave unit). In order to prevent howling from occurring in a hands-free call established between the handset and the lobby intercom, it must be performed via an echo canceller in the alarm monitoring panel. There were increasing difficulties.

[0004] Further, since the base unit of the dwelling unit is not provided with a call / call display function, it is possible to determine whether a call is made from a lobby intercom or a call from a door phone slave unit (slave unit) via an alarm monitoring panel. There was a difficulty that it was difficult to easily determine.

Further, when making a hands-free call, the microphone and the option button of the parent unit of the dwelling unit are provided on the same housing of the parent unit of the dwelling unit.
A click sound generated when the option button is operated is input to the microphone, and there is a problem that it is difficult to ensure good call quality due to the influence of the click sound.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned drawbacks. The present invention has been made to solve the above-mentioned drawbacks. It is an object of the present invention to provide a multi-unit hands-free intercom system that facilitates discrimination of a receiving / transmitting state, improves call quality when a hands-free call is established, and suppresses the cost of the system.

[0007]

In order to achieve the above object, a multi-family hands-free intercom system according to the present invention is installed in a multi-entry unit installed at an entrance of a multi-family residence and in each dwelling unit of the multi-family residence. A hands-free intercom system for a condominium that connects a parent device capable of hands-free calls through a controller and makes a call / hands-free call between the collective entrance device and the parent device. In order for the resident in the dwelling unit to hear a ringing tone from the main room speaker when a call is made from the collective entrance unit and confirm the ringing sound from the main unit speaker, a call with the collective entrance unit is established. The main room CPU which sends out a call control signal to a switching circuit for detecting the operation of the call button of the user and switching the call path to the collective entrance side and establishing a call.
And when the call control signal establishes a call between the main entrance unit and the parent room, the signal level of the reception signal from the main entrance unit and the signal level of the transmission signal from the main room unit are compared. It is characterized by comprising a signal level comparing section and an automatic alternating communication circuit having a receiving / transmitting state switching section for switching between a receiving state and a transmitting state by giving priority to a signal having a higher signal level.

[0008] Further, the multi-unit hands-free intercom system according to the present invention comprises a multi-entry unit installed at the entrance of the multi-unit apartment, and a main room unit installed in each dwelling unit of the multi-unit housing to enable hands-free communication. This is a multi-unit, hands-free intercom system that connects via a controller and makes calls and hands-free calls between the collective entrance unit and the parent unit in the living room.The parent unit in the living room is installed at the entrance of each dwelling unit. Connected to the main unit, and either one of the unit between the unit and the parent unit, or the unit between the unit and the parent unit in response to a call from the unit or the unit. A room base unit CPU for forming a communication path, a signal level of a reception signal from the dwelling unit base unit and a transmission signal from the room base unit when a call is established between the dwelling unit base unit and the room base unit. Signal level And an automatic alternating communication circuit having a receiving / transmitting state switching section for switching between a receiving state and a transmitting state by giving priority to a signal having a higher signal level. And

[0009] Further, in the living room master unit forming the hands-free intercom system of the apartment complex according to the present invention, the sound pressure level of the reception sound from the meeting entrance unit and the living room entrance slave unit sounded by the speaker of the living room master unit is fixed. Thus, a reception amplifier for adjusting the reception sound is provided in one of the communication paths of the collective entrance unit and the dwelling unit.

[0010] In addition, the living room master unit constituting the hands-free intercom system for a multiple dwelling house according to the present invention includes a call notification indicator for notifying a resident in the dwelling unit of a call from the multiple dwelling unit or the dwelling unit. The indicator light for call notification is a two-color LED that emits light in two colors, and an LED control unit for discriminating a call from any of the collective entrance unit and the dwelling unit and emitting light in a preset color. It is characterized by having.

[0011] In addition, the living room base unit constituting the hands-free intercom system for an apartment house according to the present invention may be provided from the living room base unit side to the collective entrance unit or the dwelling unit during a call established between the unit and the dwelling unit. It is characterized by having a transmission indicator light for detecting a transmission signal to the entrance cordless handset and emitting light as a transmission display when the transmission signal is being output.

In addition, the multi-unit hands-free intercom system according to the present invention provides a call notification indicator light for notifying a resident in the dwelling unit of a call from the multi-unit entrance unit or the sub-unit unit, and the multi-unit entrance unit or the multi-unit entrance. In order to detect the transmission signal from the main unit of the living room to the collective entrance unit or the entrance unit to the living room at the time of a call established with the child unit, and to emit light as a transmission display when the transmission signal is output A light emitting pattern is preset for one LED integrated so as to be able to call or notify according to the transmitting state of the transmitting indicator light, and for a calling notification and a transmitting state notification. And an LED control unit for causing the LED to emit light in response to the request.

[0013] In addition, the living room master unit constituting the multi-unit hands-free intercom system according to the present invention is provided with option buttons such as a security button and an electric lock button on a housing on which the living room master unit microphone is mounted. Uses the low click sound switch with a low click sound when operating the option button, so that the operation sound generated when the option button is operated in the main room unit is input to the main room microphone and not output from the collective entrance unit It is characterized by doing so.

[0014] Further, the living room master unit CPU constituting the hands-free intercom system of the multi-family housing according to the present invention is established with the collective entrance unit or the dwelling unit of the dwelling unit because the parent unit of the living room performs hands-free communication. In order to prevent the user from forgetting the call termination operation for terminating the current call, a timer function for forcibly terminating the call after a certain time has elapsed is provided.

[0015] According to such a multi-unit hands-free intercom system, the living room master unit, in which a communication path for establishing a hands-free call with the multi-entry unit or the sub-unit of the dwelling unit, is formed, The sound pressure level of the reception signal from the main unit or the entrance unit of the dwelling unit is compared with the sound pressure level of the transmission signal from the living room main unit, and the reception state and the transmission state can be switched by giving priority to the larger one. It is possible to suppress the occurrence of howling because the speaker of the living room main unit can output (sound) the sound pressure level of the reception sound from the collective entrance unit or the entrance unit of the dwelling unit at a constant level. Good call quality is ensured.

Also, the calling source is the collective entrance unit or the dwelling unit entrance unit, and the transmitting state of the living room parent unit in which a hands-free call is established between the unit and the dwelling unit entrance unit. The resident in the dwelling unit can be notified by using a visual display unit that emits an LED in a preset pattern.

[0017] Further, an option button of the parent device of the living room in which a communication path for establishing a hands-free call with the collective entrance device of the caller is operated, and an operation sound generated by operation of the option button is operated. Even if is input to the main unit microphone, the operation sound is a low click sound, so that the operation sound is not output (ringed) at the collective entrance device, and good call quality can be secured.

Further, a timer function is provided in the living room master unit CPU of the living room master unit in which a communication path for establishing a hands-free call with the caller's collective entrance unit or dwelling unit entrance unit is formed. Accordingly, even if the resident in the dwelling unit forgets to end the call, the hands-free call with the visitor at the collective entrance or the dwelling unit entrance can be forcibly terminated.

[0019]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a hands-free intercom system according to an embodiment of the present invention;

FIG. 1 is a circuit block diagram showing the configuration of an apartment house hands-free intercom system according to an embodiment of the present invention, which is installed at an entrance of an apartment house or the like (hereinafter referred to as an entrance hall) and called by a visitor. -From a paired line, a collective entrance device 1 capable of hands-free calls, and a plurality of main rooms 2a, 2b,... Installed in each dwelling unit of the apartment house and capable of hands-free calls by residents. Controller 3 for controlling a calling / hands-free call established between the collective entrance apparatus 1 and the parent rooms 2a, 2b,... Connected via the transmission paths L1 and L2.
A transmission line L3a (L3b,..., Partly not shown) which is installed at the entrance of each dwelling unit (hereinafter referred to as a dwelling unit entrance) and is capable of calling and hands-free communication by visitors and comprising a paired line. Are connected to the living room master units 2a, 2b,... Through the respective units (not shown).
It is composed of

In the collective entrance machine 1 shown in FIG. 1, a visitor at the collective entrance operates to call a resident in a specific dwelling unit among a plurality of dwelling units (selection calling). A call operation unit 10 composed of buttons and the like, a collective entrance unit microphone 11 and a collective entrance unit speaker 12 for inputting and outputting a voice for the visitor to establish a hands-free call with the resident, and input to the collective entrance unit microphone 11 The received speech signal (from the visitor) which has been subjected to signal processing and appropriately processed is converted into a 4-line / 2-line signal, and a transmission sound (from a resident) sounded by the collective entrance speaker 12. Hybrid circuit 13 for converting a transmission signal into two- or four-wire signals
And a multiplexing / demultiplexing circuit 14 for forming a signal transmission line between the calling operation unit 10 and the hybrid circuit 13 and the transmission line L1, and appropriately multiplexing / demultiplexing signals to be transmitted and received
And are provided.

The parent devices 2a, 2b,... Shown in FIG.
Each of them has the same configuration, and controls the circuit operation in the living room master unit and has a timer function (time keeping function). The living room master unit CPU 20 and the collective entrance unit in which the call operation unit 10 is operated by a visitor at the collective entrance unit. Call from one,
Alternatively, a ringing sound for notifying a resident in the dwelling unit of a call from the dwelling unit subunits 4a, 4b,... In which a call button 40 described later is operated by a visitor at the dwelling unit is sounded. Speaker 21 for sounding a reception sound from a visitor, microphone 22 for the living room main unit for inputting a transmission sound for the resident to establish a hands-free call with the visitor, and speaker 21 for the living room main unit. A call button 23 operated by a resident who confirms the ringing tone to operate to establish a hands-free call or to end the established hands-free call;
Is switched by a call control signal from the living room master unit CPU 20 which detects the operation of the living room master unit 20, and in response to a call from the meeting entrance unit 1 or the dwelling unit slave units 4a, 4b,... , During the dwelling unit 4a, 4b, ...
A switching circuit 24 having a reception line / transmission line switching switch 24a, 24b for forming either one of the communication paths (communication lines) between the telephone and the living room master unit and establishing a hands-free communication; When the communication line between the collective entrance unit 1 and the living room parent unit is formed by the switched receiving line / transmit line switch switches 24a and 24b of the switching circuit 24, the input is input to the collective entrance unit microphone 11. The sound pressure level of the received speech signal from the collective entrance device 1 is compared with the sound pressure level of the transmission signal input to the living room parent device microphone 21, while the dwelling units 4a, 4b,. In the case where a communication path is formed between the living room and the parent device, the living room entrance device 4 inputted to the living room entrance device microphone 41 described later
, 4b,... and the sound pressure level of the transmission signal input to the parent device microphone 21, and a signal level comparison unit 25 a Receiving / switching between the receiving state and the transmitting state by giving priority to the higher signal level detected at
An automatic alternate call circuit 25 having transmission state switching units 25b and 25c and a two-color LED that emits light in two colors, and calls from the collective entrance unit 1 or the dwelling units 4a, 4b,. .. Have a call notification indicator light 26a, 26b for notifying a resident in the office, and the collective entrance machine 1 or the dwelling unit entrance slave device 4a, 4b,. A single LED that is equipped with a transmission display function for notifying the resident in the dwelling unit of the transmission state to the user, and that can be notified according to the calling or transmission state
Under the control of the room main unit CPU 20, a light emission pattern is set in advance for a call notification and a transmission state notification, and the call notification display lamps 26a and 26b forming the LED 26 in accordance with the light emission pattern set in advance. An LED control unit 27 for emitting light, a detection voltage having a different level in each of a receiving state and a transmitting state as an output from the automatic alternating communication circuit 25, and a reference voltage divided via resistors R1 and R2. And a comparator 28 for outputting an LED control signal to the LED control unit 27 based on the compared magnitude difference, and a collective entrance unit microphone of the collective entrance unit 1 to be sounded by the living room main unit speaker 21 11 or dwelling unit 4a,
4b,... So that the sound pressure level of the reception sound from the dwelling unit microphone 41 of the dwelling unit becomes constant without being affected by the frequency characteristic attenuating in proportion to the line length of the transmission line L1 or the transmission line L2. , Collective entrance machine 1 and dwelling unit entrance slaves 4a, 4b, ...
To one of the call lines, in this embodiment, the dwelling unit
, a receiving amplifier 29 for adjusting the receiving sound provided on the communication line to each of the communication devices a, 4b,..., and the dwelling unit entrances of the dwelling unit speaker 12 of the dating unit 1 or the dwelling units 4a, 4b,. Living room master unit microphone 22 sounded by slave unit speaker 42
And the dwelling unit 4a so that the sound pressure level of the transmission sound from the telephone becomes constant without being affected by the frequency characteristic attenuating in proportion to the line length of the transmission line L1 or the transmission line L2. , 4b,..., In this embodiment, a transmission amplifier 30 for adjusting the transmission sound provided on the communication line to the dwelling unit 4a, 4b,. The housing of the parent device of the room in which the parent device microphone 22 is mounted (the same housing surface)
An option button 31 such as a security button, an electric lock button, etc., which is provided on the top and forms a low click sound switch which generates a low click sound when operated;
When a hands-free call is established between the telephone and the room master, the signal is inputted to the room master microphone 22 and appropriately signal-processed.
A transmission signal forming a transmission sound via (not described in detail) is a 4-wire / 2
In addition to the line conversion, a hybrid for converting the reception signal forming the reception sound to be sounded by the room main unit speaker 21 via the switching circuit 24 and the automatic alternating communication circuit 25 (not described in detail) into a two-wire / four-wire conversion. The circuit 32 and the dwelling unit 4a, 4
When a handset call is established between b,... and the room base unit, the signal is input to the room base unit microphone 22 and appropriately signal-processed. The transmission signal forming the transmission sound via the transmission amplifier 30 is converted to 4-line / 2-line, and the reception amplifier 29, the switching circuit 24, and the automatic alternating communication circuit 25 (not described in detail). A hybrid circuit 33 for converting a reception signal forming a reception sound to be sounded by the room main unit speaker 21 through the 2-line / 4-line system, a signal between the room room main unit CPU 20 and the hybrid circuit 32, and the transmission line L2. A multiplexing / demultiplexing circuit 34 for forming a transmission line and appropriately multiplexing / demultiplexing signals to be transmitted / received, and a signal transmission between the living room master unit CPU 20 and the hybrid circuit 33 and the transmission lines L3a, L3b,. Line Forms, as appropriate and a multiplexing and demultiplexing circuit 35 for multiplexing and demultiplexing is provided in a signal transmitted and received.

.., Shown in FIG.
Have the same configuration, and a visitor at the entrance of the dwelling unit has a call button 40 operated to call a resident in the dwelling unit, and a voice for the visitor to establish a hands-free call with the resident. Input / output dwelling unit entrance unit microphone 41
In addition, the reception signal forming the reception sound (from the visitor) input to the dwelling unit entrance unit child speaker 42 and the dwelling unit entrance unit microphone 41 and converted into an electric signal is converted to 4-line / 2-line. A hybrid circuit 43 for converting a transmission signal, which is a transmission sound (from a resident) made by the speaker 42, into a 2-line / 4-line signal, a call button 40 and a hybrid circuit 43, and transmission lines L3a, L3b. , And a multiplexing / demultiplexing circuit 44 for appropriately multiplexing / demultiplexing signals to be transmitted / received.

The operation of the thus constructed multi-unit hands-free intercom system according to one embodiment of the present invention will be specifically described below.

First, as an operation of the first call / hands-free call, a visitor at a collective entrance calls a resident in a specific dwelling unit (selection call) to establish a hands-free call. This will be specifically described.

In the circuit block diagram of FIG. 1, a visitor at the collective entrance calls a resident in a specific dwelling unit, in this case, a resident in a dwelling unit in which the living room master unit 2a is installed (selects and calls). For this purpose, the call operation unit 10 of the collective entrance apparatus 1 is operated, for example, after inputting an address which is a room number pre-assigned to a called dwelling unit, and then operating a call button, a call signal containing these operation information is obtained. But multiple
The data is transmitted to the main room CPU 20 via the multiplexing / separating circuit 34 of the separation circuit 14, the transmission line L1, the controller 3, the transmission line L2, and the parent rooms 2a, 2b,.

The parent device C of each of the parent devices 2a, 2b,...
The PU 20 compares the address included in the call signal from the collective entrance device 1 with the address assigned to the terminal in advance, and if the addresses match, a ring tone for sounding a ring tone. The signal is sent to the room master speaker 21
, And sends an LED control signal for causing the call notification display lamp 26a forming the LED 26 to emit, for example, green light to the LED control unit 27. Here, each living room master unit 2a, 2b,... Of the room main unit CPU 20 of
Only the living room main unit CPU 20 of the living room main unit 2a has the same address, a ringing tone is sounded on the room main unit speaker 21 based on the ringing sound signal from the room main unit CPU 20, and the room main unit CPU 20 receives the ringing sound. The call notification display lamp 26a forming the LED 26 emits a green light under the control of the LED control unit 27 that has detected the LED control signal, so that the resident in the dwelling unit where the living room base unit 2a is installed visits the collective entrance. The call from the person is notified.

Further, based on the ringing tone sounded by the room main unit speaker 21 and the call notification indicator light 26a forming the LED 26 which emits green light, the room confirming the call from the visitor at the collective entrance. When the resident in the dwelling unit in which the base unit 2a is installed operates the talk button 23 to establish a hands-free call with the visitor, the call is switched by a call control signal from the living room base unit CPU 20 which detects this response operation. The reception line changeover switch 24a and the transmission line changeover switch 24b forming the circuit 24 are respectively switched,
The in-room parent device speaker 21 and the in-room parent device microphone 22 used by the resident, the reception state switching unit 25b and the transmission state switching unit 25c that form the automatic alternating communication circuit 25, the reception line switching switch 24a that forms the switching circuit 24, and the transmission A collective entrance used by a visitor via the line changeover switch 24b, the hybrid circuit 32, the multiplexing / demultiplexing circuit 34, the transmission line L2, the controller 3, the transmission line L1, the multiplexing / demultiplexing circuit 14 of the collective entrance unit 1, and the hybrid circuit 13. A communication line between the device microphone 11 and the collective entrance device speaker 12 is formed, and the living room parent device CPU 20 starts timing of a preset call time starting from the time when the above-described response operation is detected. .

The communication line as described above is formed, and the resident in the dwelling unit in which the living room master unit 2a is installed is set within the collective entrance during the talking time measured by the living room master unit CPU 20 of the living room master unit 2a. A signal level comparison unit 25a which forms an automatic alternating communication circuit 25 as a transmission signal converted into an electric signal is transmitted from the transmission sound input to the microphone 22 of the main room unit in order to establish a hands-free call with a visitor in the office. And transmitted to the transmission state switching unit 25c.

In addition, a visitor at the collective entrance is required to establish a hands-free call with a resident in the dwelling unit in which the parent device 2a is installed.
The received sound (from the visitor) input to 1 is received as a received signal converted into an electric signal as a hybrid circuit 13,
Multiplexing / demultiplexing circuit 14, transmission line L1, controller 3, transmission line L
2. Via the multiplexing / demultiplexing circuit 34, the hybrid circuit 32, and the receiving line changeover switch 24a forming the switching circuit 24 of the living room master unit 2a, the signal is transmitted to the signal level comparing section 25a and the receiving state switching section 25b forming the automatic alternating communication circuit 25. Is done.

Here, the signal level comparing section 25a forming the automatic alternating communication circuit 25 of the main room unit 2a is provided with a receiving line changeover switch 24a forming a switching circuit 24 with the sound pressure level of the transmission signal from the room main unit microphone 22. Is compared with the sound pressure level of the reception signal via the communication device 1, that is, the sound pressure level of the reception signal from the collective entrance apparatus 1, and the transmission state and the reception state are switched by giving priority to the signal having the higher sound pressure level. At the same time, it outputs a detection signal indicating each state to the comparator 28.

That is, the living room parent device microphone 22 of the living room parent device 2a
If the sound pressure level of the transmission signal from the telephone is greater than the sound pressure level of the reception signal from the collective entrance device 1, the transmission prioritized by the control of the signal level comparison unit 25a that has detected the transmission state. The signal is transmitted from the transmission state switching unit 25c and the switching circuit 24.
The transmission line changeover switch 24b, the hybrid circuit 32, the multiplexing / demultiplexing circuit 34, the transmission line L2, the controller 3,
The resident in the dwelling unit where the main room unit 2a is installed through the transmission line L1, the multiplexing / demultiplexing circuit 14 of the collective entrance device 1 and the hybrid circuit 13 to the collective entrance device speaker 12, where the parent device 2a is installed. , And the comparator 28 of the parent device 2a outputs (−)
The voltage level V1 of the detection signal from the signal level comparison unit 25a forming the automatic alternating communication circuit 25a input to the terminal and the voltage level of the reference voltage divided via the resistors R1 and R2 input to the (+) terminal V0 is compared, and based on the magnitude of the compared voltage level, it is detected which of the transmission state and the reception state. Here, an LED control signal that indicates V1> V0 and indicates a transmission state is output to the LED control unit 27, and the LED control unit 27 that has detected the LED control signal outputs
D26's transmission indicator light (call notification indicator light) 26b
For example, by emitting red light, the living room master device 2
The resident in the dwelling unit where a is installed is notified that the telephone is in the transmitting state.

On the other hand, the room main unit microphone 22 of the room main unit 2a
If the sound pressure level of the transmission signal from the telephone is smaller than the sound pressure level of the reception signal from the collective entrance device 1, the reception signal given priority by the control of the signal level comparison unit 25a that has detected the reception state Is transmitted to the main room main unit speaker 21 via the reception state switching unit 25b, and is sounded by the main room main unit speaker 21 as a reception sound from a visitor at the collective entrance, and the comparator 28 of the main room main unit 2a is The voltage level V2 of the detection signal from the signal level comparison unit 25a forming the automatic alternating communication circuit 25a input to the (-) terminal and the voltage level V of the above-described reference voltage input to the (+) terminal
0, and by detecting the receiving state based on the magnitude of the compared voltage level, here, V0> V2, and stopping the output of the LED control signal to the LED control unit 27,
Speech indicator light (indication light for call notification) 26 forming LED 26
b does not emit light, and the resident in the dwelling unit where the parent device 2a is installed is notified that the receiver is in the listening state.

Further, in order to terminate the hands-free call in which the occurrence of howling is suppressed by appropriately switching the transmission state and the reception state as described above, the in-room master unit CPU 20 of the in-room master unit 2a uses The resident in the dwelling unit operates the call button 23 again within the timed call time, or the timer of the above-mentioned call time is timed up, so that the living room master unit CP that has detected these times.
A receiving line changeover switch 24a and a transmission line changeover switch 24b forming a changeover circuit 24 based on the control of U20.
Is switched, and the room main unit speaker 21 of the room room main unit 2a is switched.
Also, since the communication line between the main unit microphone 22 and the collective entrance unit microphone 11 and the collective entrance speaker 12 of the collective entrance unit 1 is cut off, the resident in the dwelling unit forgets to operate the call button 23. However, it is possible to forcibly end a hands-free call with a visitor at the collective entrance.

Further, during the hands-free call established as described above, when the resident in the dwelling unit where the living room base unit 2a is installed confirms that the visitor at the collective entrance is a suspicious person, When an option button 30 such as a security button or an electric lock button is operated by unlocking an electric lock (not shown) installed at the entrance door of the collective entrance, a click sound is generated. Is low click sound, and even if the click sound is input to the room main unit microphone 22 together with the option button on the same housing surface (not shown) of the room main unit 2a, the collective entrance unit of the collective entrance unit 1 Good sound quality can be ensured without being sounded by the speaker 12.

Next, as an operation of the second call / hands-free call, an operation for a visitor at a specific dwelling unit to call a resident in the dwelling unit and establish a hands-free call will be specifically described. I do.

In the circuit block diagram of FIG. 1, a visitor at a specific dwelling unit entrance, here, a dwelling unit entrance where the dwelling unit child unit 4a is installed, is inside the dwelling unit, that is, a dwelling unit where the living room base unit 2a is installed. When the call button 40 of the dwelling unit 4a is operated to call a resident in the room, the calling signal is transmitted through the multiplexing / separating circuit 44, the transmission line L3a, and the multiplexing / separating circuit 35 of the room main unit 2a. Is transmitted to the machine CPU 20.

The living room master unit CPU 20 of the living room master unit 2a detects a calling signal from the entrance door unit 4a of the dwelling unit, sends a ringing signal to the speaker 21 of the living room master unit and an LED 26.
An LED control signal for causing the call notification display light 26a to emit green light, for example, and the call notification display light 26b to emit red light, for example, red among the call notification display lights 26a and 26b, 27, a ringing tone is sounded on the room main unit speaker 21 based on the ringing sound signal from the room main unit CPU 20, and the LED control signal from the room main unit CPU 20 is detected.
Under the control of the D control unit 27, the call notification indicator light 26a, which constitutes the LED 26, emits green light, the call notification indicator light 26b emits red light, and the green and red lights are mixed, and the LED 26 emits orange light. A resident in the dwelling unit where the machine 2a is installed is notified of a call from a visitor at the dwelling unit entrance.

Further, based on the ringing tone sounded by the main room speaker 21 and the LED 26 illuminated in orange,
When the resident in the dwelling unit where the parent room 2a, which has confirmed the call from the visitor at the dwelling unit, is installed, operates the call button 23 to establish a hands-free call with the visitor, this response operation is performed. The reception line changeover switch 24a and the transmission line changeover switch 24b forming the switching circuit 24 are respectively switched by the detected call control signal from the room main unit CPU 20, and the main room speaker 21 and the main room microphone 22 used by the occupant are connected to each other. A receiving state switching unit 25b and a transmitting state switching unit 25c forming an automatic alternating communication circuit 25, and a receiving line switching switch 2 forming a switching circuit 24
4a and the transmission line switch 24b, the reception amplifier 29 and the transmission amplifier 30, the hybrid circuit 33, the multiplexing / demultiplexing circuit 35, the transmission line L3a, the multiplexing / demultiplexing circuit 44 of the unit 4a, and the hybrid circuit 43. A call line is formed between the entrance door unit microphone 41 and the entrance door unit speaker 42 used by the visitor, and the living room base unit CPU 20 is set in advance when the above-described response operation is detected. Start timing of the current talk time.

The communication line as described above is formed, and the resident in the dwelling unit where the living room master unit 2a is installed is moved to the entrance of the living room during the talking time measured by the living room master unit CPU 20 of the living room master unit 2a. A signal level comparison unit 25a which forms an automatic alternating communication circuit 25 as a transmission signal converted into an electric signal is transmitted from the transmission sound input to the microphone 22 of the main room unit in order to establish a hands-free call with a visitor in the office. And transmitted to the transmission state switching unit 25c.

In addition, a visitor at the collective entrance enters the microphone 41 of the dwelling unit 3a of the dwelling unit 4a in order to establish a hands-free call with a resident in the dwelling unit where the living room base unit 2a is installed. The received call sound (from the visitor) is converted into an electric signal as a received signal, as a hybrid circuit 43, a multiplexing / demultiplexing circuit 44, a transmission line L3a, a living room base unit 2a.
Is transmitted to the receiving amplifier 29 via the multiplexing / demultiplexing circuit 35 and the hybrid circuit 33, and the receiving amplifier 29 determines the sound pressure level of the received signal from the dwelling unit 4a by the line length of the transmitted path, that is, The amplified reception signal is amplified to eliminate the influence of the frequency characteristic in which the sound pressure level is reduced in proportion to the length of the transmission line L3a, and the amplified reception signal is passed through a reception line changeover switch 24a forming a switching circuit 24. The signal is transmitted to the signal level comparing section 25a and the receiving state switching section 25b constituting the automatic alternating communication circuit 25.

Here, the signal level comparison unit 25a forming the automatic alternating communication circuit 25 of the parent room 2a is connected to the sound pressure level of the transmission signal from the microphone 22 of the living room and the reception line switch 24a forming the switching circuit 24. , The sound pressure level of the reception signal from the dwelling unit 4a is compared with the sound pressure level of the reception signal, and the signal with the higher sound pressure level is given priority to change the transmission state and the reception state. Switching,
A detection signal indicating each state is output to the comparator 28.

That is, the room master unit microphone 22 of the room master unit 2a
If the sound pressure level of the transmission signal from the transmitter is higher than the sound pressure level of the reception signal from the dwelling unit 4a, the transmission is prioritized by the control of the signal level comparison unit 25a that has detected the transmission state. The speech signal is transmitted to the transmission amplifier 30 through the transmission state switching unit 25c and the transmission line switch 24b forming the switching circuit 24. The transmission amplifier 30 transmits the sound pressure level of the transmission signal. In order to eliminate the influence of the frequency characteristic in which the sound pressure level is reduced in proportion to the length of the line to the dwelling unit 4a, ie, the length of the transmission line L3a, the transmission signal amplified is amplified. The circuit 33, the multiplexing / separating circuit 35, the transmission line L3a, the multiplexing / separating circuit 44 of the doorway unit 4a, and the hybrid circuit 43 are transmitted to the speaker unit 42 at the doorway of the unit, and the speaker 42 at the doorway unit at the doorway. Base unit 2a is installed The transmitted sound from the resident in the dwelling unit is sounded, and the sound pressure level of the transmitted sound is equal to the sound pressure level of the transmitted sound inputted to the living room base unit microphone 22, and is sounded at a constant level. At the same time, the comparator 28 of the parent device 2a inputs the voltage level V1 of the detection signal from the signal level comparison unit 25a constituting the automatic alternating communication circuit 25a input to the (-) terminal and the (+) terminal. Resistance R
1. The voltage level of the reference voltage divided via R2 is compared with the voltage level V0, and the state of the transmission state or the reception state is detected based on the level of the compared voltage level. Here, V
1> V0, and an LED control signal indicating the transmission state is output to the LED control unit 27.
The ED control unit 27 causes the transmission indicator light (call notification indicator light) 26b, which constitutes the LED 26, to emit red light, for example, in red, so that the resident in the dwelling unit where the living room master unit 2a is installed is in a transmission state. You will be notified that there is.

On the other hand, the room master unit microphone 22 of the room master unit 2a
Is lower than the sound pressure level of the reception signal from the dwelling unit 4a, the reception signal prioritized by the control of the signal level comparison unit 25a that has detected the reception state. Is transmitted to the main room speaker 21 via the reception state switching unit 25b.
Is sounded as a reception sound from a visitor at the entrance to the dwelling unit, and the sound pressure level of the reception sound is determined by the microphone 4
1 is sounded at a constant level which is equal to the sound pressure level of the received sound input to the unit 1, and the comparator 28 of the living room master unit 2a operates the automatic alternating communication circuit 25 input to the (-) terminal.
a, the voltage level V2 of the detection signal from the signal level comparison unit 25a and the voltage level V0 of the above-described reference voltage input to the (+) terminal are compared, and the magnitude of the compared voltage level, here, V0 > Detecting the receiving state based on V2 and
By stopping the output of the LED control signal to the ED control unit 27, the transmission indicator (call notification indicator) 26b, which is the LED 26, is maintained in red light emission,
The resident in the dwelling unit where a is installed is notified that it is in the receiving state.

In order to terminate the hands-free call in which the occurrence of howling is suppressed by appropriately switching the transmission state and the reception state as described above, the first
In the same manner as in the above operation, the resident in the dwelling unit operates the talk button 23 again within the talk time measured by the living room master unit CPU 20 of the living room master unit 2a, or the above-mentioned time counting of the talk time is up. By doing so, the reception line switch 24a and the transmission line switch 24b forming the switching circuit 24 are switched based on the control of the room master CPU 20 detecting these, and the room speaker 21 of the room master 2a and Since the communication line between the living room main unit microphone 22 and the dwelling unit sub unit microphone 41 and the dwelling unit sub unit speaker 42 of the dwelling unit sub unit 4a is cut off, the resident in the dwelling unit operates the call button 23. Even if you forget that, you can forcibly end the hands-free call with the visitor at the dwelling entrance.

The first and second embodiments according to the embodiment of the present invention are described below.
In each operation of (1), the collective entrance unit microphone 11 of the collective entrance unit 1 or the dwelling unit of the dwelling unit subordinate units 4a, 4b,. The sound pressure level of the reception sound from the entrance terminal microphone 41 is constant without being affected by the frequency characteristic attenuating in proportion to the line length of the transmission line L1, the transmission line L2, or the transmission lines L3a, L3b,. , A receiving line switching switch 24a and a hybrid circuit 33, which constitute a switching circuit 24 connected to a communication line to one of the dwelling units 4a, 4b,... However, it is also possible to interpose between the receiving circuit changeover switch 24a forming the switching circuit 24 connected to the communication line to the collective entrance apparatus 1 forming the other communication line and the hybrid circuit 32. so Ri, set entrance machine 1, dwelling entrance door station 4a,
4b,..., A single automatic alternating communication circuit 25 can be used.

[0047]

As is apparent from the above description, according to the multi-family hands-free intercom system of the present invention, a communication path for establishing a hands-free call with a multi-entry entrance unit or a dwelling sub-entry unit is established. In the formed living room master, the sound pressure level of the reception signal from the collective entrance unit or the dwelling unit is compared with the sound pressure level of the transmission signal from the living room base unit, and the larger one is prioritized. It is possible to switch between the reception state and the transmission state, and to output (sound) the sound pressure level of the reception sound from the collective entrance unit or the dwelling unit at the fixed level by the living room main unit speaker of the main room unit. As a result, it is possible to ensure good communication quality by suppressing the occurrence of howling and to eliminate the need for an echo canceller as in the conventional example, thereby reducing the cost of the system. It can also be.

Also, the calling source is a collective entrance unit or a dwelling unit entrance unit, and the transmitting state of the living room parent unit in which a hands-free call is established between the unit and the dwelling unit entrance unit, respectively. The resident in the dwelling unit can be notified by using a visual display unit that emits an LED in a preset pattern.

Also, in the main room unit in which a communication path for establishing a hands-free call with the calling entrance unit is formed, an option button mounted on the same housing surface as the main room unit For example, even if a security button or an electric lock button is operated and an operation sound generated by operation of the option button is input to the parent room microphone, this operation sound is a low click sound, so that And good communication quality can be secured.

Further, a timer function is provided in the living room master unit CPU of the living room master unit in which a communication path for establishing a hands-free call with the calling entrance collective entrance unit or the dwelling unit entrance entrance unit is formed. Accordingly, even if the resident in the dwelling unit forgets to end the call, the hands-free call with the visitor at the collective entrance or the dwelling unit entrance can be forcibly terminated.

[Brief description of the drawings]

FIG. 1 is a circuit block diagram showing a configuration of an apartment house hands-free intercom system according to an embodiment of the present invention.

[Explanation of symbols]

 1. Collective entrance machines 2a, 2b,. ···································································································································································································································································· Automatic alternating communication circuit 25a... Signal level comparing section 25b, 25c... Receiving / transmitting state switching section 26... LED 26a... ···································································································· Option button

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Kenji Matsuoka 2-18-18 Jinnocho, Atsuta-ku, Nagoya-shi, Aichi F-Term within Aiphone Co., Ltd. 5C054 CD06 CH05 DA01 DA08 EG02 HA22 5K027 AA09 BB14 DD07 HH01 5K038 AA01 CC12 DD08 FF10 FF13

Claims (8)

[Claims] 1. A collective entrance machine (1) installed at an entrance of an apartment house or the like, and a room main unit (2a, 2b,...) Installed in each dwelling unit of the apartment house and capable of hands-free communication. Is connected via a control device (3), and a calling / hands-free call is made between the collective entrance unit and the living room base unit. When called from the collective entrance unit, a ringing tone is sounded at the room main unit speaker (21), and the resident in the dwelling unit confirming the ringing tone from the living room main unit speaker talks with the collective entrance unit. The main room CPU which detects an operation of a call button (23) for establishing a call, switches a call path to the collective entrance, and sends a call control signal to a switching circuit (24) for establishing the call.
(20) when the call control signal establishes a call between the collective entrance and the living room master, the signal level of the reception signal from the collective entrance and the transmission level of the transmission signal from the living room master A signal level comparing section (25a) for comparing the signal level with a signal receiving / transmitting state switching section (25b, 25c) for switching between a receiving state and a transmitting state by giving priority to a signal having a higher signal level; A multi-unit hands-free intercom system comprising an automatic alternating communication circuit (25). 2. A collective entrance machine (1) installed at an entrance of an apartment house or the like, and a room main unit (2a, 2b,...) Installed in each dwelling unit of the apartment house and capable of hands-free communication. Is connected via a control unit (3), and a calling / hands-free call is made between the collective entrance unit and the living room base unit. A dwelling unit (4a, 4b,...) Installed at the entrance of the dwelling unit is connected, and the gathering unit and the living room master unit are called in response to the call from the gathering unit or the dwelling unit. And a living room master CPU (20) for forming any one of the communication paths between the living room entrance slave and the living room master, and a communication between the living room entrance slave and the living room master. When a call is established between the unit and the reception unit A signal level comparing section (25a) for comparing the signal level of the signal with the signal level of the transmission signal from the living room master unit, and for switching between the reception state and the transmission state by giving priority to the higher signal level A multi-unit hands-free intercom system, comprising: an automatic alternating communication circuit (25) having a reception / transmission state switching unit (25b, 25c). 3. The main entrance of the living room, wherein the main entrance of the living room and the main entrance of the living room have a constant sound pressure level of the reception sound from the sub-unit of the dwelling unit. The hands-free intercom system according to claim 1 or 2, further comprising a receiving amplifier (29) for adjusting a receiving sound on one of the communication paths of the main unit and the dwelling unit. 4. The call notification display lamps (26a, 26b) for notifying a resident in the dwelling unit of a call from the collective entrance unit or the dwelling unit entrance sub unit to the living room base unit.
And the call notification display lamp emits two colors L.
The ED, further comprising: an LED control unit (27) for judging a call from the collective entrance device or the dwelling unit and emitting light in a preset color. The multi-unit hands-free intercom system according to claim 1 or 2. 5. A communication between the living room master unit and the living room entrance unit during a call established between the living room parent unit and the living room entrance slave unit. A transmission indicator (2) for detecting a transmission signal and emitting light as a transmission display when the transmission signal is being output.
The multi-unit hands-free intercom system according to claim 1 or 2, further comprising 6b). 6. A call notification indicator light (26a, 26b) for notifying a resident in the dwelling unit of a call from the collective entrance machine or the dwelling unit, and the collective entrance device or the dwelling unit. During a call established between the main unit and the main unit side, the transmission signal to the collective entrance device or the dwelling unit is detected as a transmission signal from the living room parent device side as the transmission signal when the transmission signal is output. A single LED (26) integrated so as to be able to call a call indicator light (26b) to emit light or notify according to the call state, and a light emission pattern for call notification and call state notification in advance. 3. The hands-free intercom system according to claim 1, further comprising: an LED control unit configured to set and emit the LED according to the preset light emission pattern. Beam. 7. The living room base unit includes a living room base unit microphone (2).
2) An option button (30) such as a security button or an electric lock button is provided on a housing on which the option button is mounted, and a low click sound switch having a low click sound when operating the option button is used as the option button. 7. An operation sound generated when the option button is operated in the living room master unit is input to the living room master unit microphone and is not output from the collective entrance device. The multi-family hands-free intercom system according to any one of the above. 8. The room main unit CPU terminates a call established with the collective entrance unit or the dwelling unit entrance unit because the room main unit performs a hands-free call. To prevent you from forgetting the end call operation,
8. A system according to claim 1, further comprising a timer function for forcibly terminating a call after a predetermined time has elapsed.
The described multifamily hands-free intercom system.