JPH05207110A - Telephone system - Google Patents

Abstract

PURPOSE:To enable using an analog telephone set in a digital line by providing a conversion circuit impressing direct current on a telephone set and exchanging the circuit of the output of the telephone set and a switch changing over the telephone set and a transmitter-receiver. CONSTITUTION:When a telephone set (t) is selected by an analog line/digital line switching signal 116, a changeover switch 117 is connected with a telephone set (t). The signal input from the telephone set (t) impresses direct current on the telephone set (t), passes through a telephone set interface (i) changing a two-wire circuit signal to a four-wire circuit signal, is outputted to a calling circuit 107 and performs the calling signal interface with an exchange in a digital telephone line. When a transmitter 113 and a receiver 114 are selected by the signal 116, the contact point of the transmitter 113 and the receiver 114 sides are selected in the switch 117 and a digital telephone line interface with the exchange is performed. By such constitution, the telephone set (t) for analog line can be connected with the digital line to be used.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a telephone device for digital communication lines.

[0002]

2. Description of the Related Art FIG. 4 shows an example of the configuration of a telephone used for a digital line. Reference numeral 201 is a connection terminal to which a subscriber line is connected, 202 is a transmission terminal section, 203 is a line terminal section, 20
4 is a codec, 205 is a signal control unit, 206 is a changeover switch, 207 is a call circuit, 209 is a calling amplifier, 210 is a sounder, 212 is a push button dial,
Reference numeral 213 is a transmitter, 214 is a receiver, and 215 is a dual frequency generation circuit for the output analog signal.

If the push button dial 212 is pressed at the time of calling, the signal control unit 205 generates a selection signal of a digital signal corresponding to the pressed dial number, and the line termination unit 203 inserts this into the signal channel. Then, it is transmitted to the exchange through the transmission termination unit 202.

At the same time, a dual frequency signal corresponding to the pressed dial number is generated by the dual frequency signal generation circuit 215, and the changeover switch 206 is changed over to the opposite side under the control of the signal control unit 205.
The output of the two-frequency signal generation circuit 215 is given to the codec 204 instead of the transmission voice signal from the communication circuit 207, inserted into the voice channel in the line terminating unit 203, and then exchanged via the transmission terminating unit 202. Sent to.

The output of the two-frequency signal generation circuit 215 is switched to the transmission signal from the communication circuit 207 and is given to the codec 204, where it is digitized and transmitted to the other party.

In addition, the transmission termination unit 202 takes out power from the subscriber line, automates according to the characteristics of the subscriber line, establishes synchronization with the exchange side, and replaces the two-wire circuit with the four-wire circuit. Is going. The line terminating unit 203 assembles and disassembles a voice channel and a signal channel, a signal transmission speed and codec 204 on the subscriber line side, and a signal control unit 205.
The speed is converted to the signal transmission speed on the side. The codec 204 encodes the transmission voice signal from the transmitter 213 via the communication circuit 207 and supplies it to the line terminating unit 203, while decoding the reception encoded signal from the terminating unit 203,
It is given to the handset 214 via the call circuit 207. The signal control unit 205 drives the amplifier 209 in response to the ringing signal from the line terminating unit 203 and pushbutton dial 2
The selection signal corresponding to the operation of 12 is sent to the line sending end 203.

Next, FIG. 5 shows an example of the configuration of a telephone used for a general analog line. Reference numeral 301 is a connection terminal to which a subscriber line is connected, 302 is a hook switch, 303 is a line terminating unit, 305 is a signal control unit, 306 is a changeover switch, 307 is a communication circuit, 309 is an amplifier for calling, and 31
0 is a sounder, 312 is a push button dial, 313 is a transmitter, 314 is a receiver, and 315 is a two-frequency generation circuit.

The line terminating unit 303 is a hook switch 302.
The power is taken out from the subscriber line in response to the turning on of the line, the call level with the exchange side is adjusted according to the characteristics of the subscriber line, and the 2-wire circuit and the 4-wire circuit are exchanged.

The two-frequency signal corresponding to the selection signal corresponding to the operation of the push button dial 312 at the time of transmission is generated by the two-frequency signal generation circuit 315 to generate the two-frequency signal corresponding to the pressed dial number. The changeover switch 306 is changed over to the opposite side by the control.

When a voice signal is input from the transmitter 313, the voice signal is amplified through the communication circuit 307, and the line terminating unit 303 exchanges the 4-wire circuit signal with the 2-wire circuit and outputs it to the line. On the other hand, the received signal from the line terminating unit 303 is given to the handset 314 via the communication circuit 307, and the calling amplifier 309 is driven according to the calling signal from the line terminating unit 303 and the sounder 310 is operated. Is output to.

[0011]

As described above, the telephone for analog line is used by being connected to the telephone line by the two-wire circuit, whereas the input / output conditions of the handset for digital communication line are used. Has a drawback in that an analog telephone, which is a 2-wire circuit output, cannot be connected due to 4-wire input / output.

[0012]

The present invention has the object of overcoming such drawbacks. That is, an input / output terminal for connecting an analog telephone line telephone to a digital line handset terminal, a DC applying circuit for driving the analog telephone, and an analog telephone output from a two-wire circuit By having a switching circuit for switching to a wire circuit and a switch for switching between an analog telephone line and a handset for digital telephone by a digital / analog selection signal, by switching by a digital / analog selection signal during dial operation, The analog telephone is also used as a handset for a digital telephone line.

The present invention also provides an input / output terminal for connecting an analog telephone line telephone to a digital line handset terminal, a DC application circuit for driving the analog telephone, and an analog telephone output. Has a conversion circuit for exchanging a 2-wire circuit into a 4-wire circuit, and an analog telephone
It is also designed to be used for handsets for digital telephone lines.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a first configuration example of a telephone according to the present invention. 101 is a connection terminal to which a subscriber line is connected, 10
2 is a transmission terminating unit, 103 is a line terminating unit, 104 is a codec, 105 is a signal control unit, 106 is a changeover switch, 107 is a communication circuit, 109 is a calling amplifier, and 11
Reference numeral 0 is a sounder, 112 is a push button dial, 113 is a transmitter, 114 is a receiver, 115 is a dual-frequency generation circuit whose output is an analog signal, and 101 to 115 have the same functions as 201 to 215.

The telephone t has the same function as that described in FIG.

Reference numeral 116 is an analog line / digital line switching signal, which is output by an operator's operation. A switch 117 is switched by the analog line / digital line switching signal 116.

The telephone interface i drives the telephone t, and the telephone t and the communication circuit 107 serve as a signal interface i. The telephone interface i is configured as shown in FIG. Reference numeral 401 denotes a driving DC applying circuit which supplies a driving current to the telephone t. DC drive circuit for driving 4
The AC output impedance of 01 is very large and can be ignored as the load impedance of the telephone t.

Reference numeral 402 is a telephone connection terminal for connecting the telephone t.

Reference numerals 403 and 404 denote capacitors which prevent the direct current for driving the telephone supplied from the direct current application circuit 401 from flowing into the communication circuit side.

A hybrid transformer 405 converts the 2-wire circuit signal sent from the telephone t into a 4-wire circuit signal, and converts the 4-wire circuit signal into a 2-wire signal for the telephone t. Is supplied to the telephone t.

Reference numerals 406, 407 and 408 are terminating resistors for converting the 2-wire to 4-wire circuit, and 409 and 410 are amplifiers, which are telephones t.
And the signal level of the communication circuit 107 are adjusted.

Here, when the telephone t is selected by the analog line / digital line switching signal 116, the changeover switch 117 changes the telephone t as shown in FIG.
Connected to. The signal input from the telephone set t passes through the telephone set interface i and is output to the call circuit 107 to perform a call signal interface with the exchange through the digital telephone line as in FIG.

Next, when the transmitter 113 or the receiver 114 is selected by the analog line / digital line switching signal 116, the changeover switch 117 is operated by the transmitter 11.
3. The contact point on the side of the handset 114 is selected, and the interface with the exchange is performed as in the case of FIG.

FIG. 3 shows a second configuration example of the present invention. 101
Is a connection terminal to which a subscriber line is connected, 102 is a transmission termination unit, 103 is a line termination unit, 104 is a codec, and 105
Is a signal control unit, 106 is a changeover switch, 107 is a call circuit, 109 is a calling amplifier, 110 is a sounder,
112 is a push button dial, 113 is a transmitter, 114
Is a receiver, 115 is a dual-frequency generation circuit whose output is an analog signal, and 101 to 115 have the same functions as 201 to 215.

The telephone t has the same function as that described in FIG.

The telephone interface i drives the telephone t, and the telephone t and the communication circuit 107 serve as a signal interface. The telephone interface i is configured as shown in FIG.

The signal input from the telephone set t connected as shown in FIG.
It is output to 07 and the call signal interface with the exchange is performed through the digital telephone line as in the case of FIG.

[0028]

As described above, according to the present invention, the analog telephone can be used for the digital line.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a first telephone that implements the present invention.

FIG. 2 is a configuration diagram of a telephone interface according to an embodiment.

FIG. 3 is a configuration diagram of a second telephone implementing the present invention.

FIG. 4 is a block diagram of a conventional digital telephone.

FIG. 5 is a configuration diagram of a conventional analog telephone.

[Explanation of symbols]

 102 Transmission Termination Unit 105 Signal Control Unit 106 Changeover Switch 107 Communication Circuit 112 Push Button Dial 113 Telephone Transmitter 114 Telephone Receiver 115 Dual Frequency Generation Circuit

Claims (2)

[Claims] 1. A connection terminal for connecting an analog telephone line telephone to a digital line handset terminal, a DC application circuit for driving the analog telephone line telephone, and an analog telephone line telephone output of a two-wire system. It has a conversion circuit for switching the circuit to a 4-wire circuit and a switch for switching between an analog telephone line and a handset for a digital telephone according to a selection signal. By switching according to the selection signal, the analog telephone line telephone is a digital telephone line. A telephone device characterized by being shared with 2. An input / output terminal for connecting an analog telephone line telephone to a digital line handset terminal, a DC applying circuit for driving the analog telephone, and an analog telephone output from a two-wire circuit to 4 A telephone device characterized by using an analog telephone as a digital telephone line handset by adding a conversion circuit for switching to a wire circuit.