JPH06141103A - Speech monitoring method and its device - Google Patents

Abstract

PURPOSE:To reduce the cost and to miniaturize the size of a device by decreasing one of two isolation transformers having been required for a conventional method and eliminating the need for a relay circuit requiring high dielectric strength so as to attain simple circuit configuration with less number of components. CONSTITUTION:The method is constituted of a signal detection means 22 connected to a circuit in the inside of a terminal equipment and monitoring and detecting a specific signal code on a communication channel 5, a termination resistor 28 provided on a specific circuit in the inside of the terminal equipment, and an electronic controlled analog switch 27 controlling the connection of the termination resistor 28 to the communication channel 5. The electronic controlled analog switch 27 is switched by a detection signal from the signal detection means 22 to switch the communication mode to the exclusive communication mode with the circuit in the inside of the terminal equipment.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a call monitoring method and apparatus for monitoring the communication contents of a communication terminal adapter or the like installed between a telephone line and general telephone terminal equipment, and further communication. The present invention relates to a call monitoring method and apparatus for identifying general analog communication and data communication by monitoring contents.

[0002]

2. Description of the Related Art In general, among terminal devices that realize a telecommunication function by connecting to a wired telecommunication line, while realizing analog communication such as voice communication, the contents of the communication are monitored and specified inside the terminal device. If the communication partner can be identified by a method such as receiving the signal code of, the function to switch the communication to the modem etc. inside the terminal device as it is and continue the subsequent communication exclusively with the modem etc. inside the terminal device. A communication terminal adapter having is known.

The communication terminal adapter is installed between a telephone line and a general telephone terminal device, and selects a communication line by changing a dial number or the like. In addition, in the case of changing the charge system of the communication carrier that provides the communication line or changing the service, the line selection judgment data in the communication terminal adapter is changed, and the traffic information is notified to the communication carrier. It is necessary to carry out regular communication such as.

Conventionally, in these communications, the following 2
Two methods are taken. The signal switching configuration of the conventional communication terminal adapter shown in FIG. 3 will be described below. In the figure, 1 is a terminal device, 2 is a communication terminal adapter, 3 is a communication center, 4 is a telephone line, and 5 is a communication line.

The first method, as shown in FIG. 3A, is to automatically issue a report from the communication terminal adapter 2 so that the communication center 3 of the communication carrier and the communication terminal adapter 2 communicate with each other. It is something to do. In addition, the second method is shown in FIG.
As shown, from the communication center 3 of the communication carrier to the terminal device 1
Is issued to the user via the communication terminal adapter 2 as necessary.

After the terminal device 1 responds to the notification from the communication center 3, the communication terminal adapter 2 monitors a specific signal code sent from the communication center 3. When a specific signal code is issued from the communication center 3, the specific signal code is identified, the communication is switched to a modem or the like in the communication terminal adapter 2, and the connection with the terminal device is cut off. It is a dedicated communication with the communication center 3.

Then, the dedicated communication set between the communication terminal adapter 2 and the communication center 3 is used to change the line selection judgment data and notify the traffic information. In the second method, the notification of the communication center 3 is the same as other general communication for the terminal device 1, and
The communication terminal adapter 2 placed in the preceding stage is indistinguishable from other general communications.

Therefore, the communication terminal adapter 2 has a function of constantly monitoring the communication content of an incoming call and switching the communication between the terminal device 1 and the telephone line 4 to the communication terminal adapter 2 by receiving a specific signal code. There is a need. Next, according to the configuration diagram of the conventional communication terminal adapter of FIG.
The conventional call monitoring will be described.

In FIG. 4, 1 is a terminal device, 2 is a communication terminal adapter, 5 is a communication line, 21 is a terminal feeding circuit, and 22
Is a signal detection circuit, 23 is a modem circuit, 24 is a PB signal sending circuit, 25 is a DC loop sending circuit, 26 is a relay switching circuit, 29 is a transformer circuit, 61 is a hybrid transformer, and 62 is a relay circuit. In the configuration diagram of FIG.
The terminal power supply circuit 21 supplies a terminal current when a call is made from the terminal device 1, and also has a function of monitoring dial information as necessary. The relay switching circuit 26 switches between connecting the terminal device 1 to the terminal power feeding circuit 21 or directly connecting the terminal device 1 to the communication line 5.

When the terminal device 1 is connected to the terminal power supply circuit 21, the dial information is monitored to realize functions such as dial conversion, and the terminal device 1 is connected to the communication line 5.
In the case of directly connecting to, the dial information from the terminal device 1 is directly sent to the communication line 5. In addition to the terminal power supply circuit 21 described above, the communication terminal adapter 2 includes a modem circuit 23 for transmitting and receiving determination data and traffic information to and from the communication center 3, and DTMF dial information required for a telephone line. (Dual Tone MultiFr
(equity) signal, P that sends out the DTMF signal
It has a B signal transmission circuit 24, and these circuits are connected via a relay circuit 62 and a hybrid transformer 61.

Here, the hybrid transformer 61 forms a communication path and supplies a low impedance circuit while insulating the communication line 5 when transmitting and receiving dial information, a modem signal and the like from the communication terminal adapter 2. It is a transformer circuit. The relay circuit 62 disconnects the hybrid transformer 61, which is a low impedance circuit required to match the impedance of the communication line 5 when sending dial information or the like from the communication terminal adapter 2. The relay circuit 62 disconnects the low impedance circuit when the terminal device 1 is directly connected to the communication line 5.

In addition to the above circuit, the signal detection circuit 22 is also provided.
Are connected via a transformer circuit 29. The signal detection circuit 22 is a circuit for identifying the presence or absence of a specific signal code from the communication center for an incoming call, and prevents the terminal device 1 from being affected by the transformer circuit 29 terminated with high impedance. is doing. Next, the operation of the conventional communication terminal adapter will be described with reference to FIG.

As shown by an arrow A in FIG. 4A, the terminal device 1 receives an incoming call from the communication line 5.
The relay switching circuit 26 is switched to the side to which the communication line 5 is directly connected. Since the operation such as dial conversion is not necessary, the DC loop sending circuit 25 does not form a DC loop, and the relay circuit 62 is also in the state of disconnecting the hybrid transformer 61 side.
The B signal transmission circuit 24 is in a non-connection state.

On the other hand, the signal detection circuit 22 is connected via a transformer circuit 29 with a high impedance termination so as not to affect the communication with the terminal equipment 1 as shown by an arrow B, and the communication line 5 side. The presence or absence of a specific signal code from is constantly monitored. Here, when the signal detection circuit 22 receives a predetermined specific signal code indicating the connection with the communication center, the communication between the terminal device 1 and the communication center 3 becomes unnecessary thereafter, and the communication with the communication center 3 is performed. Only communication for transmission / reception of judgment data and traffic data with the terminal adapter 2 is required. Therefore, as indicated by the broken arrow C in FIG. 4B, the direct current loop is formed by the direct current loop sending circuit 25 by the reception of the specific signal code of the signal detecting circuit 22, and the relay switching circuit 26 and the relay circuit 62. Is turned on.

As a result, the terminal device 1 is disconnected from the communication line 5 and terminates the communication line 5 with low impedance as shown by the arrow D in FIG.
Communication center 3 using the modem circuit 23 as shown in
Start dedicated communication with.

[0016]

However, in the above-mentioned conventional apparatus, a circuit configuration for detecting a specific signal code, which is composed of a signal detection circuit and a transformer circuit, and a modem circuit, a hybrid transformer, and a relay circuit, are used. The communication center and the circuit configuration for the communication terminal adapter to perform dedicated communication are different from each other.

This circuit configuration requires two expensive and large-sized insulating transformers, a transformer circuit and a hybrid transformer, and a relay circuit having a high withstand voltage for disconnecting the low impedance circuit. Further, there are two systems, a first circuit group including a modem circuit that detects a signal from a communication line, a PB signal transmitting circuit, a hybrid transformer, and a relay circuit, and a second circuit group including a signal detecting circuit and a transformer circuit. Will be needed.

Therefore, this structure is a problem to be solved in an apparatus which is low in price and requires miniaturization. SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems, to provide a call monitoring method and an apparatus therefor, which can use a simple circuit configuration with a small number of used parts and can be downsized at a low price.

[0019]

DISCLOSURE OF THE INVENTION The present invention provides call monitoring that monitors and detects a specific signal code on a communication line inside a terminal device and switches the communication mode to dedicated communication with a circuit inside the terminal device. In doing so, a detection means for monitoring and detecting a specific signal code connected to the circuit inside the terminal device, a terminating resistor provided in the specific circuit inside the terminal device, and a connection of the terminating resistor to the communication line are controlled. The switching means is switched by the detection signal from the detecting means to switch the communication mode to dedicated communication with the circuit inside the terminal equipment.

The switching means is composed of an electronically controlled analog switch, and the circuit inside the terminal equipment and the communication line can be connected via a transformer circuit.

[0021]

The specific signal code on the communication line is monitored and detected inside the terminal device, and the specific signal code is monitored and detected in the call monitoring in which the communication mode is switched to the dedicated communication with the circuit inside the terminal device. It is possible to connect the detection means to a circuit inside the terminal device, switch the impedance of the circuit inside the terminal device by the detection signal of the detection device, and switch the communication mode to dedicated communication with the circuit inside the terminal device by this impedance switching. it can.

The configuration of the present invention eliminates the need for two expensive and large-sized insulating transformers, a transformer circuit and a hybrid transformer, and a relay circuit having a high withstand voltage for disconnecting a low impedance circuit, which are conventionally required. Can be

[0023]

Embodiments of the present invention will now be described in detail with reference to the drawings. The call monitoring of the present invention will be described with reference to the block diagram of the communication terminal adapter of the present invention in FIG. In FIG. 1, 1 is a terminal device, 2 is a communication terminal adapter, and 5
Is a communication line, 21 is a terminal power supply circuit, 22 is a signal detection circuit, 23 is a modem circuit, 24 is a PB signal transmission circuit, and 25
Is a DC loop sending circuit, 26 is a relay switching circuit, 27 is an electronically controlled analog switch, 28 is a terminating resistor, and 29 is a transformer circuit.

In the configuration diagram of FIG. 1, the terminal feeding circuit 21
Supplies terminal current when a call is made from the terminal device 1, and also has a function of monitoring dial information as needed. The relay switching circuit 26 switches between connecting the terminal device 1 to the terminal feeding circuit 21 or directly connecting the terminal device 1 to the communication line 5.

When the terminal device 1 is connected to the terminal feeding circuit 21, the dial information is monitored to realize functions such as dial conversion, and when the terminal device 1 is directly connected to the communication line 5. , The dial information from the terminal device 1 is directly sent to the communication line 5. The communication terminal adapter 2 has a signal detection circuit 22, a modem circuit 23, and a PB signal transmission circuit 24 in addition to the terminal power feeding circuit 21.

The signal detection circuit 22 is a circuit for identifying the presence or absence of a specific signal code from the communication center 5 for an incoming call, and is terminated with a high impedance in order to prevent the terminal device 1 from being affected. It is connected to the communication line 5 via the transformer circuit 29. In addition, the modem circuit 23
Is a circuit for transmitting / receiving judgment data and traffic information to / from a communication center.
9, termination resistor 28 and electronic control unit analog switch 27
It is connected to the communication line 5 via.

Further, in the PB signal transmission circuit 24, the dial information required for the telephone line is DTMF (Dual).
A circuit for sending out the DTMF signal in the case of a Tone Multi Frequency signal, and like the modem circuit 23, the transformer circuit 29 and the terminating resistor 2
8 and an electronic control type analog switch 27, and is connected to the communication line 5.

Therefore, in the configuration of the communication terminal adapter of the present invention, the signal detection circuit 22 and the modem circuit 23 are provided to the communication circuit 5 via one transformer circuit 29.
And a PB signal detection circuit 24 are connected. Next, the operation of the communication terminal adapter will be described with reference to the operation diagram of the communication terminal adapter of the present invention in FIG.

In FIG. 2A, as shown by an arrow F, a terminal device 1 receives an incoming call from the communication line 5.
The relay switching circuit 26 is switched to the side to which the communication line 5 is directly connected. Since the operation such as dial exchange is not necessary, the DC loop sending circuit 25 does not form a DC loop, and the electronically controlled analog switch 27 does not need to terminate the communication line 5 with low impedance. 28 is turned off so as to be separated.

On the other hand, the signal detection circuit 22 is connected to the communication line 5 side through the winding of the transformer circuit 29 as shown by an arrow G in FIG. The presence or absence of is constantly monitored. The transformer circuit 29 has a high impedance termination so as not to affect communication with the terminal device 1. Here, when the signal detection circuit 22 receives a predetermined specific signal code indicating the connection with the communication center, the communication between the terminal device 1 and the communication center 3 becomes unnecessary thereafter, and the communication with the communication center 3 is performed. Only communication for transmission / reception of judgment data and traffic data with the terminal adapter 2 is required. Therefore, as indicated by the broken line arrow H in the figure, the direct current loop is formed by the direct current loop sending circuit 25 by the reception of the specific signal code of the signal detecting circuit 22, and the relay switching circuit 26 and the electronically controlled analog switch 27 are connected. Turn on.

As a result, the terminal device 1 is disconnected from the communication line 5 and terminates the communication line 5 with a low impedance as shown by the arrow I in FIG. 2B, and the arrow J in FIG. As shown, the modem circuit 23 is used to initiate dedicated communication with the communication center. As in the above configuration, the signal detection circuit 22 in which the signal flow direction is opposite
The reason why the modem circuit 23 and the PB signal sending circuit 24 can be connected to the communication line 5 by one transformer is as follows. (1) The condition that the low impedance termination is required is only when the communication terminal adapter 2 sends out some signal such as a dial signal or a modem transmission signal.
When the incoming call from the communication line 5 is handled by directly connecting the communication line 5 with the communication line 5, it is not necessary to terminate with low impedance. (2) To detect a specific signal code from the communication line 5,
The AC signal voltage generated in the communication line 5 is monitored, and it may be terminated with high impedance.

Therefore, when a certain signal is sent from the communication terminal adapter 2 by simply switching the electronically controlled analog switch 27 without using a high voltage relay circuit, the terminating resistor 28 is connected to terminate with low impedance. Further, when the signal detection circuit 22 detects a specific signal code from the communication line 5, the terminating resistor 28 is used.
Can be separated and terminated with high impedance, and further, two transformers, which were conventionally required, can be combined into one.

The present invention is not limited to the above embodiments, but various modifications can be made based on the spirit of the present invention, and these are not excluded from the scope of the present invention.

[0034]

As described above in detail, according to the present invention, one communication isolation transformer, which is necessary when transmitting a signal from a communication terminal adapter, is efficiently used, and the transformer secondary side is used. Connect the terminating resistance of the device by using an inexpensive electronically controlled analog switch that does not require high withstand voltage specifications.
By controlling, it is possible to switch the low impedance circuit, monitor a specific signal code from the communication line, and transmit / receive a modem signal or the like.

Therefore, as compared with the conventional call monitoring method and its apparatus, the number of parts used can be reduced, the cost can be reduced, and the monitoring circuit can be simplified, and the price can be reduced and the size can be reduced. A call monitoring method and its device can be provided.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a communication terminal adapter of the present invention.

FIG. 2 is an operation diagram of the communication terminal adapter of the present invention.

FIG. 3 is a configuration diagram of signal switching in a conventional communication terminal adapter.

FIG. 4 is a configuration diagram of a conventional communication terminal adapter.

[Explanation of symbols]

 1 Terminal Equipment 2 Communication Terminal Adapter 5 Communication Line 21 Terminal Feeding Circuit 22 Signal Detection Circuit 23 Modem Circuit 24 PB Signal Sending Circuit 25 DC Loop Sending Circuit 26 Relay Switching Circuit 27 Electronically Controlled Analog Switch 28 Terminating Resistor 29 Transformer Circuit

Claims (4)

[Claims] 1. A call monitoring method for monitoring and detecting a specific signal code on a communication line inside a terminal device and switching a communication mode to dedicated communication with a circuit inside the terminal device, comprising: A detection means for monitoring and detecting a signal code is connected to a circuit inside the terminal equipment, (b) impedance switching of a circuit inside the terminal equipment is performed by a detection signal of the detection means, and (c) the impedance switching means A call monitoring method, characterized in that the communication mode is switched to dedicated communication with a circuit inside the terminal device. 2. A call monitoring device that monitors and detects a specific signal code on a communication line inside a terminal device and switches the communication mode to dedicated communication with a circuit inside the terminal device, wherein: (a) the terminal device. Detection means for monitoring and detecting the specific signal code connected to an internal circuit; (b) a terminating resistor provided in the specific circuit inside the terminal device; (c) the communication line of the terminating resistor. And (d) switching the switching means in response to a detection signal from the detecting means, thereby switching the communication mode to dedicated communication with a circuit inside the terminal device. Call monitoring device. 3. The call monitoring device according to claim 2, wherein the switching means is an electronically controlled analog switch. 4. The call monitoring device according to claim 2, wherein a circuit inside the terminal device is connected to a communication line via a transformer circuit.