JP3384169B2 - Intercom equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication device provided with an intercom, a terminal for communicating with the intercom, and a main unit for connecting the intercom with the terminal.

[0002]

2. Description of the Related Art Conventionally, as a communication device of this type, the impedance of a balance network included in a hybrid circuit is a value that is initially set, or a signal is input to the circuit and the level of the returned signal is measured. A configuration is known in which correction is performed. Hereinafter, each configuration will be described with reference to the schematic block diagrams shown in FIGS.

In FIG. 5, A is a main unit, B is a terminal, and C.
Is an intercom and a plurality of terminals B (1) to (N) are used. In the main device A, 1 is a hybrid circuit for transmitting / receiving a call signal to / from the intercom C, 2 is a hybrid circuit for transmitting / receiving a call signal to / from the terminal B, and has a balance network 2a. 3 is a transmission amplifier for amplifying a call signal from the intercom C, 4 is a reception amplifier for amplifying a call signal from the terminal B, 5 is a control signal transmission to the terminal B and the terminal B
A control signal transmitting / receiving unit for receiving a control signal from
Reference numeral 6 is a control unit for controlling the entire main device A and the terminal B, 7
Is a changeover switch for changing the impedance of the balance network 2a depending on the number of connected terminals B.

In the terminal B, 10a is a call circuit for transmitting / receiving a call signal to / from the intercom C, 10d is a microphone, 10e is a receiver, 10b is a control signal sent to the main unit A and other terminals B in the same system. And a control signal sending / receiving unit for receiving control signals from the main device A and other terminals B in the same system, 10 c is a control unit for controlling the entire terminal B, and 10 is a circuit included in the entire terminal B. Impedance. Note that the terminals B of (1) to (N) all have the same configuration.

In the above structure, the impedance of the balance network 2a set by the changeover switch 7 is fixed.

In the conventional example shown in FIG. 6, an oscillator 8 for sending a constant frequency signal to the main unit A and a level detector 9 for detecting the level of the signal sent back from the oscillator 8 are provided. In contrast to the conventional example described above, the other configurations are the same as those of the conventional example.

In the above structure, the impedance of the balance network 2a is corrected from the level detected by the level detector 9.

[0008]

However, in the former configuration of the above-mentioned conventional examples, the person must first count the number of connected terminals B and set the correction control of the balance network 2a according to the number. Since this is necessary, a trouble occurs in the intercom communication due to the trouble, the number of terminals B or the setting error, or the change in the number of terminals B connected after the setting. Further, when the circuit impedances of the terminals B are different from each other, it is not always possible to set the optimum correction control of the balance network simply by connecting only the number of connected terminals, so that stable intercom communication characteristics cannot be maintained. Further, since the changeover switch 7 has to be provided, there is a problem that the cost of the communication device itself increases.

On the other hand, in the latter configuration, the oscillator 8 and the level detector 9 are prevented from oscillating and the balance network 2a is provided.
Since it has to be provided only to correct the above, there is a problem that the cost of the communication device itself increases.

The present invention solves the above-mentioned conventional problems, and the main unit manages the number of connected terminals so that stable intercom communication characteristics are always maintained regardless of the number of connected terminals. It is an object of the present invention to provide a communication device that can perform automatic control for reducing the cost of the entire device.

[0011]

[Means for Solving the Problems] To achieve the above object
The communication apparatus of the present invention is the communication device, comprising: a door intercom, and a plurality of terminals that perform voice communication with the intercom, a main device and for connecting said plurality of terminals and said intercom, previous SL main unit, the correction control It has possible balance network, a hybrid circuit for performing a pre SL terminal and passing story,
A control signal transmitting and receiving means intends line and a control signal received from the control signal transmitted the previous SL terminal Previous SL terminal, said balance net
It controls the work and control signal transmission / reception means of the main device.
That a control means, before SL terminal comprises a line intends control signal transmitting and receiving means and the respective control signal transmission of the terminal to the control signal received in the previous Kinushi equipment before Kinushi instrumentation placed al, before Symbol main apparatus of
Control signal transmitting and receiving means each extension before SL terminal
Send a control signal to cause it to be transmitted from the terminal.
It recognizes the number of connected before SL terminal by receiving the control signal of the respective extension, control means of said main apparatus to perform the correction control of the previous SL balance network according <br/> connected units of the terminal It is equipped with.

[0012] communication apparatus of the present invention, the the intercom, and a plurality of terminals that perform voice communication with the de <br/> Ahon, and the intercom
In the communication device comprising a main device for connecting a plurality of terminals, before Symbol main unit has a possible balance network prevent oscillation control, and a hybrid circuit for performing a pre SL terminal and passing story, before Symbol a control signal transmitting and receiving means intends row control signals received from the control signal transmitted the previous SL terminal to the terminal, the roses
And a control signal transmitter / receiver for the main device.
And control means for controlling the stage comprises a pre SL terminal each control signal sending means for performing a control signal transmission of the terminal to the control signal received in the previous SL main unit from the front Symbol main unit, before Symbol main It transmits a control signal for controlling signal transmitting and receiving means of the device to transmit a respective extension number before Symbol terminals, all
If not receiving a control signal from the terminal, but having to carry out prevention control of the oscillation of the prior SL balance network.

[0013] communication apparatus of the present invention, a door phone, a plurality of terminals that perform voice communication with the de <br/> Ahon, and the intercom said
In a communication device including a main device that connects a plurality of terminals, the main device is a balance network capable of correction control.
And a hybrid for communicating with the terminal
A circuit and a circuit for each of the terminals,
Sends a control signal to generate the path impedance
However, the system that informs the circuit impedance from the terminal
Control signal transmitting / receiving means for receiving a control signal, and the balance
Controls the network and the control signal transmitting / receiving means
And control means, before SL terminal, the times from the main device
Receives a control signal for transmitting the path impedance
And, over the previous SL main unit, a control signal transmitting and receiving means for sending a control signal indicative of the circuit impedance, before
The control means of the main device transmits and receives the control signal of the main device.
By the circuit impedance received by the signal means to recognize the circuit impedance of the entire terminal, in which example Bei <br/> to perform correction control of the impedance of the balance network.

Further, the above technical means can be combined.

[0015]

According to the present invention configured as described above, by utilizing the transmission / reception means of the control signal between the main device and the terminal, which are usually provided as the communication device, and the correction control of the balance network is enabled. The main device can recognize the number of connected terminals only by connecting the terminal to the main device, and can always correct the balance network.

In addition, the use of a transmission / reception means for control signals between the main device and the terminal, which is usually provided as a communication device,
By enabling the transmission prevention control of the balance network, the main unit can constantly monitor the state of the number of connected terminals, and when it recognizes that it is not connected, it can prevent oscillation by controlling the balance network. .

In addition, a transmission / reception means for control signals between the main device and the terminal, which is usually provided as a communication device, is used,
Enabling correction control of the balance network,
The terminal is provided with a control signal sending means for notifying the main device of its own circuit impedance, and the main device is provided with means for recognizing the control signal of notifying the circuit impedance of each terminal in the same system. The main device can recognize the circuit impedance of the entire connected terminals regardless of the number of connected terminals, and can correct the impedance of the balance network to an optimum value.

[0018]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic block diagram showing a communication device according to an embodiment of the present invention. In FIG. 1, A is a main device, B is a terminal, C is an intercom, and a plurality of terminals B (1) to (N) are used. Main device A
In FIG. 1, 1 is a hybrid circuit for transmitting / receiving a call signal to / from the intercom C, 2 is a hybrid circuit for transmitting / receiving a call signal to / from the terminal B, and has a balance network 2a. 3 is a transmitting amplifier for amplifying a call signal from the intercom C, 4 is a receiving amplifier for amplifying a call signal from the terminal B, 5 is a control signal transmission to the terminal B and a control signal reception from the terminal B A control signal transmitter / receiver unit 6 for controlling the main device A and a control unit 6 for controlling the terminal B as a whole.

In the terminal B, 10a is a call circuit for transmitting / receiving a call signal to / from the intercom C, 10d is a microphone, 10e is a receiver, 10b is a control signal to the main unit A and other terminals B in the same system. And a control signal sending / receiving unit for receiving control signals from the main device A and other terminals B in the same system, 10 c is a control unit for controlling the entire terminal B, and 10 is a circuit included in the entire terminal B. Impedance. Note that the terminals B of (1) to (N) all have the same configuration.

The above construction will be described in more detail below with reference to the operation thereof with reference to the protocol diagrams for explaining the operation shown in FIGS.

In the example shown in FIG. 2, (1) to
A control signal for transmitting each extension number is transmitted to the terminal B of (N) via the control signal transmission / reception unit 5. The control unit 10c of each terminal B is the control signal sending / receiving unit 1
When the signal received via 0b is recognized, the extension number of itself is time-divided to the main device A via the control signal transmitting / receiving unit 10b so that signals are not overlapped between other terminals B in the same system. To send. The control unit 6 of the main apparatus A recognizes the number of connected terminal B from the extension number received the control signal via the control signal transmission / reception unit 5, and the balance network 2a
The impedance is controlled according to the number of connected terminals B.

In the example shown in FIG. 3, the control unit 6 transmits a control signal for transmitting an extension number to the terminal B via the control signal transmission / reception unit 5, and the control unit 6 controls the control signal. If the extension number to be received via the signal transmission / reception unit 5 cannot be recognized within a certain period of time, the terminal B recognizes that it is not connected, and performs call origination prevention control of the van balance network 2a.

In the example shown in FIG. 4, the control unit 6 outputs (1) to (1) to
A control signal for transmitting a control signal indicating the respective self-impedances is transmitted to the terminal B of (N) via the control signal transmission / reception unit 5. When the control unit 10c of each terminal B recognizes the signal received through the control signal transmission / reception unit 10b, the control unit 10c transmits a control signal indicating its own impedance via the control signal transmission / reception unit 10b to the main device A.
, The signals are transmitted in a time division manner so that signals do not overlap between other terminals B in the same system. The control unit 6 of the main device A recognizes the impedance of the entire terminal B in the same system from the respective impedance values received by the control signal transmission / reception unit 5 and sets the impedance of the balance network 2a to the optimum value. The correction control is performed according to.

[0025]

As described above, according to the present invention, the transmission / reception means of the control signal between the main device and the terminal, which is usually provided as the communication device, is used, and the correction control of the balance network is enabled. It is easy to correct the balance network, and it is possible to prevent the malfunction of the doorphone call due to the setting error of the number of terminals or the change of the number of connected terminals after setting, and since the circuit is not increased, the device itself The cost of can be reduced.

Further, by utilizing the transmission / reception means of the control signal between the main device and the terminal, which are usually provided as a communication device, and by enabling the transmission prevention control of the balance network,
Since there is no complicated circuit for preventing transmission of the balance network, the cost of the entire device can be reduced.

Further, by using the control signal transmitting / receiving means between the main device and the terminal, which are usually provided as a communication device, correction control of the balance network is enabled, and the terminal informs the main device of its own circuit impedance. By including a control signal transmitting means, the main device is provided with a means for recognizing a control signal for notifying the circuit impedance of each terminal in the same system, so that the main device recognizes the circuit impedance of all terminals in the same system, The impedance of the balance network can be corrected to an optimum value, and since the number of circuits is not increased, the cost of the device itself can be reduced.

[Brief description of drawings]

FIG. 1 is a schematic block diagram showing a communication device according to first to third embodiments of the present invention.

FIG. 2 is a schematic protocol diagram showing a communication device according to the first embodiment of the present invention.

FIG. 3 is a schematic protocol diagram showing a communication device according to a second embodiment of the present invention.

FIG. 4 is a schematic protocol diagram showing a communication device according to a third embodiment of the present invention.

FIG. 5 is a schematic block diagram showing a conventional general communication device.

FIG. 6 is a schematic block diagram showing a communication device in another conventional example.

[Explanation of symbols]

A main device B terminal C door phone 1 hybrid circuit 2 hybrid circuit 2a Balance network 3 transmitter amplifier 4 receiver amplifier 10 circuit impedance 10a call circuit 10b Control signal transmitter / receiver 10c control unit 10d microphone 10e receiver

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) H04M 9/00-9/10 H04M 11/00-11/10 H04M 1/00 H04M 1/24-1 / 253 H04M 1/58-1/62 H04M 1/66-1/82

Claims (3)

(57) [Claims] And intercom [1 claim], a plurality of terminals that perform voice communication with the intercom, the communication device comprising a main device for connecting the plurality of terminals and said intercom, previous SL main unit,
Have the potential balance network correction control, intends lines and hybrid circuit, and a control signal received from the control signal transmitted the previous SL terminal to the previous SL terminal for performing pre SL terminal and passing story
Control signal transmitting / receiving means , the balance network, and
And control means for controlling the control signal transmitting / receiving means of the main device
Preparative comprising a Kinushi instrumentation placed these control signals received before the previous SL terminal
Each of the control signals sent and the rows of the terminal Previous Kinushi equipment
Comprising a Cormorant control signal transmitting and receiving means, transmission control signal before Symbol main unit
Receiving means to transmit the respective extension number before SL terminal
It transmits a control signal for each of the extension from the terminal
Communication device to recognize the number of connected before SL terminal by receiving the control signal of the number, the control unit of the main device and performs the correction control of the pre-Symbol balance network according to the connection number of the terminal. 2. A door intercom, a plurality of terminals that perform voice communication with the intercom, the communication device comprising a main device for connecting the plurality of terminals and said intercom, previous SL main unit,
Have the potential balance network oscillation prevention control line before <br/> Symbol hybrid circuit for performing terminal and through talk, the control signal received from the control signal transmitted the previous SL terminal Previous SL terminal
Control signal transmitting / receiving means and the balance network
And a control hand for controlling the control signal transmitting / receiving means of the main device
And a stage provided with a pre-SL terminal each control signal sending means for performing a control signal transmission of the terminal to the control signal received in the previous SL main unit from the front Symbol main unit, transmission control signal before Symbol main unit
Transmits a control signal for receiving means to transmit the respective extension number before Symbol terminal, the control signal from any of the terminal
If not receiving the items, pre-Symbol communication device which is characterized in that the prevention control of the oscillation of the balance network. 3. A door intercom, a plurality of terminals that perform voice communication with the intercom, the communication device comprising a main device for connecting the plurality of terminals and the intercom, the main apparatus,
It has a balance network capable of correction control,
A hybrid circuit for talking with the end and the terminal
In contrast, the circuit impedance of each of the terminals
Send a control signal to cause the terminal to transmit the control signal from the terminal.
Control for receiving control signals indicating the circuit impedance
Signal transmitting and receiving means, said balance network and front
And control means for controlling the serial control signal transmitting and receiving means, before <br/> SL terminal, originating the circuit impedance from the main device
Receiving a control signal for signal, over the previous SL main unit,
A control signal transmitting and receiving means for sending a control signal indicative of the circuit impedance, the control unit of the main device,
The time received by the control signal transmitting / receiving means of the main device.
Communication device to recognize the circuit impedance of the entire terminal via road impedance, and performs correction control of the impedance of the balance network.