JP3487871B2 - Call monitoring device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a call monitoring device for monitoring the communication content of a communication terminal adapter or the like installed between a telephone line and a general telephone terminal device, and further monitoring the communication content. by relates call audit MiSo location to perform identification of general analog communication and data communication.

[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.

Further, in the case of changing the charge system of a communication carrier providing a communication line or changing the service, the line selection judgment data in the communication terminal adapter is changed,
It is necessary to carry out regular communication such as notification to the carrier's tiger Fi-click information.

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, 5 is a communication line, and 6 is a modem .

[0008] The first method, as shown in FIG. 3 (a),
The communication terminal adapter 2 automatically issues a report to communicate between the communication center 3 of the communication carrier and the communication terminal adapter 2.

In the second method, as shown in FIG. 3 (b) , a communication center 3 of a telecommunications carrier issues a report to the terminal device 1 via the communication terminal adapter 2 as necessary. It is something to do.

After responding to the notification from the communication center 3 in the terminal device 1, the communication terminal adapter 2 monitors a specific signal code transmitted from the communication center 3. When a specific signal code is issued from the communication center 3, the specific signal code is identified, and the communication is switched to the modem 6 or the like in the communication terminal adapter 2 to disconnect the connection with the terminal device 1 ,
Dedicated communication is performed between the communication terminal adapter 2 and the communication center 3.

[0011] Then, the dedicated communication set between the communication terminal adapter 2 and the communication center 3 performs the change or line selection decision data, a notification such as tiger Fi click information.

In the second method, the notification from the communication center 3 is similar to other general communication to the terminal device 1, and the communication terminal adapter 2 placed in front of the terminal device 1 distinguishes it from other general communication. I can't get it.

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, conventional call monitoring will be described with reference to the configuration diagram of the conventional communication terminal adapter shown in FIG.

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
Signal detection circuit, 23 is a modem circuit, 24 a PB signal transmission circuit, 25 denotes a DC loop transmission circuit, 26 is a relay switching circuit, the transformer circuit 29, 61 is hybrid Tran <br/> scan, 62 relay circuit Is.

In the configuration diagram of FIG. 4, 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 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 feeding 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.

Further, the communication terminal adapter 2, in addition to the terminal power supply circuit 21, the communication center 3 determines between the data and tigers Fi Tsu modem circuit 23 for sending and receiving click information
And the dialing information required for the telephone line is DTMF (D
ual Tone MultiFreq u ency) PB signal transmission circuit 2 for transmitting a DTMF signal when the signal
4 has, these circuits are connected via the relay circuit 62 and the hard <br/>Iburi' de transformer 61.

[0019] Here, hybrid transformer 61, when receiving the dialing information and modem signals and the like from the communication terminal adapter 2, while achieving the insulation of a communication line 5, a low impedance circuit with constituting the channel It is a transformer circuit to supply. Further, the relay circuit 62 from the communication terminal adapter 2 when transmitting dialing information and the like, wherein a low impedance circuit required to take matching between the impedance of the communication line 5 hybrid tiger <br/> Nsu 61 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.

[0022] In FIG. 4 (a), with respect to the incoming call from the communication line 5 as indicated by arrow A, and the relay switch circuit 26 is switched to the side of connecting the terminal device 1 and the communication line 5 is directly There is. Since operations such as dialing conversion is not necessary, the direct current loop transmission circuit 25 does not constitute a direct current loop, also relay circuit 62 becomes a state of disconnecting the hybrid transformer 61 side, the modem circuit 23 and PB
The 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 device 1 as shown by the arrow B, and the communication line 5 side The presence or absence of a specific signal code from is constantly monitored.

[0024] Here, the signal detection circuit 22, when it receives a specific signal code predetermined showing the connection between the communication center 3, the communication between the terminal 1 and the communication center 3 in which thereafter becomes unnecessary, communication only communications for transmitting and receiving the decision data and tigers Fi Kkudeta between center 3 and the communication terminal adapter 2 is required. for that reason,
In FIG. 4 (b), as indicated by broken line arrow C,
Upon reception of the specific signal code of the signal detection circuit 22, a DC loop is formed by the DC loop sending circuit 25, and the relay switching circuit 26 and the relay circuit 62 are turned on.

[0025] Thus, FIG. 4 the terminal device 1 as indicated by arrow D in (b) terminates the communication line 5 at a low impedance with is disconnected from the communication line 5, modems circuit 23 as indicated by arrow E To start dedicated communication with the communication center 3.

[0026]

[SUMMARY OF THE INVENTION However, said conventional apparatus, the circuit configuration for detecting a specific signal code composed of signal detection circuit and transformer circuit,
Modem circuit, hybrid transformer, and a communication center constituted by a relay circuit circuit configuration for communication terminal adapter communicates dedicated and are separately configured.

[0027] With this circuit construction is large isolation transformer needs two mounting area expensive that transformer circuit and the high <br/> Bridger de transformer, also a relay circuit having a high withstand voltage for disconnecting a low impedance circuit Will be needed.

Furthermore, the modem circuit for detecting a signal from the communication line, PB signal transmission circuit, hybrid transformer,
And a relay circuit and a first circuit group including a relay circuit and a second circuit group including a signal detection circuit and a transformer circuit are required.

Therefore, this structure is a problem to be solved in an apparatus which is low in price and requires miniaturization.

[0030] The present invention is to solve the problems described above, it is possible to simplify circuit configuration uses less parts, and to provide the call audit MiSo location that can be miniaturized at low cost .

[0031]

In order to achieve the above object, the present invention [1] is connected to a terminal device, monitors and detects a specific signal code on a communication line, and sets the communication mode to a communication terminal. adapter
And the call monitoring device for switching to a private communication with the communication center, and the terminal power supply circuit 21 for supplying a terminal current when it is calling from the terminal device 1, a specific signal code from the communication center 3 to the wear Shinko With the presence of
A signal detection circuit 22 connected via a transformer circuit 29 terminated with high impedance to prevent the influence on the terminal device 1 and the specific signal code are detected.
If not, connect the terminal device 1 directly to the communication line 5.
And when the specific signal code is received, the terminal
Switch device 1 to connect to the terminal power supply circuit 21
For example a relay switching circuit 26 for, as well as sends and receives decision data and traffic information between said communication center 3, the transformer circuit 29, the termination resistor 28 and the
If no specific signal code is detected
The modem circuit 23 connected to the communication line 5 via the analog switch 27 that is turned on when a specific signal code is received, and the specific signal code are received.
And a DC loop sending circuit 25 that constitutes a DC loop,
The required dial information is transmitted to the telephone line, and the transformer circuit 29, the terminating resistor 28 and the specific
If the signal code of the
The communication terminal adapter has a PB signal sending circuit 24 connected to the communication line 5 via an analog switch 27 which is turned on when the signal code of 1 is received .

[2] In the call monitoring device according to [1] above
The analog switch 27 is an electronically controlled analog
Switch.

[0033]

[Action] is connected to the terminal device monitors a specific signal code on a communication line, detect and, in a dedicated communication switching call monitoring and communications mode the terminal equipment, monitoring a specific signal code, detected to be detected The means is connected to a circuit inside the terminal device, the impedance of the circuit inside the terminal device is switched by the detection signal of the detecting means, and the communication mode can be switched to dedicated communication with the circuit inside the terminal device by this impedance switching. .

Further, the configuration of the present invention, a large insulating transformer mounting area with two expensive that the transformer circuit and hybrid transformer which is conventionally required, a relay circuit having a high withstand voltage for disconnecting a low impedance circuit It can be unnecessary.

[0035]

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 shown in FIG.

In FIG. 1, 1 is a terminal device, 2 is a communication terminal adapter, 3 is a communication center, 5 is a communication line, 21 is a terminal feeding circuit, 22 is a signal detection circuit, and 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, 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 power supply circuit 21, 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 includes a signal detection circuit 22 and a modem circuit 2 in addition to the terminal power feeding circuit 21.
3 and PB signal transmission circuit 24.

The signal detection circuit 22 is a circuit for identifying the presence or absence of a specific signal code from the communication center 3 for an incoming call, and is terminated with a high impedance to prevent the terminal device 1 from being affected. It is connected to the communication line 5 via the transformer circuit 29.

The modem circuit 23 is used in the communication center 3
Determining a circuit for transmitting and receiving data and tigers Fi click information, the transformer circuit 29, and is connected to the communication line 5 through a terminating resistor 28, and an electronic controlled analog switch 27 between the.

Further, in the PB signal transmission circuit 24, the dial information required for the telephone line is DTMF (Dual).
Tone is a circuit that sends the DTMF signal in the case of Multi Freq u ency) signal, connected to the communication line 5 wherein similarly to the modem circuit 23 transformer circuit 29, via a termination resistor 28 and the electronic controlled analog switches 27 Has been done.

Therefore, the communication terminal adapter 2 of the present invention
In the configuration of via one transformer circuit 29 to the communication times line 5, the signal detection circuit 22, the modem circuit 2
3 and the 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.

[0046] In FIG. 2 (a), with respect to the incoming call from the communication line 5 as indicated by the arrow F, with relay switching circuit 26 is switched to the side of connecting the terminal device 1 and the communication line 5 is directly There is. Since the operation such as dial exchange is unnecessary, the DC loop sending circuit 25 does not form a DC loop, and the electronic control type analog switch 27 does not need to terminate the communication line 5 with low impedance.
The terminating resistor 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 3, the communication between the terminal device 1 and the communication center 3 becomes unnecessary thereafter, and the communication is performed. only communications for transmitting and receiving the decision data and tigers Fi Kkudeta between center 3 and the communication terminal adapter 2 is required. for that reason,
As indicated by the dashed arrow H in FIG. 2 (a), constitute a direct current loop by DC loop transmission circuit 25 upon receipt of a specific signal code of the signal detecting circuit 22, a relay switching circuit 26 and the electronic controlled analog switches 27 is turned on.

As a result,TwoIndicated by arrow I in (b)
When the terminal device 1 is disconnected from the communication line 5
Both ends the communication line 5 with low impedance,Two
Use the modem circuit 23 as shown by arrow J in (b)
Communication centerThreeStart dedicated communication with.

As in the above configuration, the signal detection circuit 22 in which the signal flow directions are opposite to each other, the modem circuit 23 and the PB signal transmission circuit 24 are combined into one communication line 5 by a single transformer.
You can be connected to for the following reasons: (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 transmitted from the communication terminal adapter 2 only by switching the electronically controlled analog switch 27 without using a high breakdown voltage relay circuit, the terminating resistor 28 is connected to terminate with a 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.

[0053]

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. connection termination resistors to the use of such unwanted inexpensive electronic controlled analog switches of the high-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.

[0054] Therefore, as compared with the conventional call audit MiSo location, reduce the number of components used, low cost, and can be simplified, such as the monitoring circuit, it can be downsized at low cost call it is possible to provide a <br/> superintendent MiSo location.

[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 3 Communication Center 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 Electronic Controlled Analog Switch 28 Terminating Resistor 29 Transformer Circuit

Claims (2)

(57) [Claims] 1. A connected to terminal equipment, monitoring a specific signal code on a communication line, and detects the communication the communication mode terminal
In a call monitoring device for switching to dedicated communication between an adapter and a communication center , (a) a terminal power supply circuit that supplies a terminal current when a call is made from a terminal device, and (b) identification of an incoming call from the communication center. Signal code
The presence or absence of the
Transformer with high impedance termination to prevent
A signal detection circuit connected via a circuit, and (c) if the specific signal code is not detected,
If the terminal device is directly connected to the communication line,
When the No. code is received, the terminal device is fed with the terminal power.
Relay switching circuit that switches to connect to the circuit
And (d) transmitting and receiving determination data and traffic information to and from the communication center, and the transformer circuit,
When the termination resistance and the specific signal code are not detected
Is on when the specified signal code is received in the off state
A modem circuit connected to the communication line via an analog switch that is in a state, and (e) a DC loop is received when the specific signal code is received.
And (d) sending the required dialing information to the telephone line, and the transformer circuit, the terminating resistor and the specific signal.
If no code is detected, the specified signal
A call monitoring apparatus comprising: a communication terminal adapter having a PB signal sending circuit connected to the communication line via an analog switch which is turned on when a code signal is received . 2. The call monitoring device according to claim 1, wherein the analog switch is an electronically controlled analog switch.