CN216904988U

CN216904988U - Extension device for telephone exchange

Info

Publication number: CN216904988U
Application number: CN202220213321.XU
Authority: CN
Inventors: 沈洪
Original assignee: CIG Shanghai Co Ltd
Current assignee: CIG Shanghai Co Ltd
Priority date: 2022-01-26
Filing date: 2022-01-26
Publication date: 2022-07-05
Anticipated expiration: 2032-01-26

Abstract

The utility model discloses a telephone switchboard extension device, comprising: an input unit including a first signal input signal terminal for transmitting a first signal and a second signal input signal terminal for transmitting a second signal; the extension unit is respectively connected with the first input signal and the second signal input end, and is used for performing voltage transformation processing on the first signal and the second signal and outputting the first signal and the second signal; and the terminal unit is connected with the extension unit and used for receiving the first signal and the second signal output by the extension unit, and the terminal unit is grounded. The extension device of the telephone exchange isolates the telephone interface input from the outside from the telephone line extension interface output from the inside, and the constant current device is added between the terminal unit and the extension unit, so that the feed voltage or the feed current of the sound signal can be increased, and the function of realizing the long-distance work of the telephone exchange can be realized.

Description

Extension device for telephone exchange

Technical Field

The utility model relates to the technical field of telephone exchanges, in particular to a telephone exchange extension device.

Background

The ringing signal in the telephone exchange is a high-voltage and low-frequency alternating current signal sent to the called user telephone by the exchange, and the ringing signal has the function of ringing the called user to inform the called user that a call is made at the moment, the call can be realized after the called user is off-hook, the subscriber line of the telephone exchange is generally within 2 kilometers at present, and the feed current is generally within 20-30 Ma. It is difficult to satisfy clear ringing and sufficient loudness even at a long distance or with a large power supply capacity, and therefore, it is necessary to design a telephone exchange that can significantly increase the communication distance and the range of use of the wired telephone by increasing the feed voltage or the feed current of the constant current source.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects of the prior art, the utility model provides a telephone exchange extension device, which solves the problem that the prior telephone exchange can not realize long-distance work.

In order to realize the purpose, the utility model is realized by the following technical scheme: a telephone exchange extension apparatus comprising:

an input unit including a first signal input signal terminal for transmitting a first signal and a second signal input signal terminal for transmitting a second signal;

the extension unit is respectively connected with the first input signal input end and the second signal input end, and is used for performing voltage transformation processing on the first signal and the second signal and outputting the first signal and the second signal;

and the terminal unit is connected with the extension unit and used for receiving the first signal and the second signal output by the extension unit, and the terminal unit is grounded.

Preferably, the antenna further comprises a first blocking capacitor, and the first blocking capacitor is arranged between the first signal end and the extension unit.

Preferably, the mobile terminal further comprises a second blocking capacitor, and the second blocking capacitor is arranged between the terminal unit and the extension unit.

Preferably, the audio compensation device further comprises a compensation unit connected between the terminal unit and the extension unit for providing an audio compensation signal.

Preferably, the compensation unit is formed of a constant current device.

Preferably, the method further comprises the following steps:

the ringing detection circuit is used for outputting a current signal by the input unit and feeding the current signal back to the ringing exchange generator;

and the off-hook detection circuit is used for detecting the current of the ringing current switching generator.

Preferably, the ring current detection circuit comprises a ring current detection device for feeding back a ring current signal, and the ring current signal is fed back to the ring current switching generator.

Preferably, the off-hook detection circuit comprises an off-hook detection device for feeding back an off-hook detection signal, and the off-hook detection signal is fed back to the off-hook device.

The utility model has the following beneficial effects:

1. the extension units are arranged on the input unit and the terminal unit, the output signal passes through the isolation device formed by the transformer and the blocking capacitor, the blocking capacitor can filter the direct current voltage from the input unit, the transformer can realize the voice signal transmission of the first signal and the second signal from the input unit, the telephone interface of the external input is isolated from the telephone line extension interface of the internal output, and the remote communication action is realized.

2. By adding the constant current device between the terminal unit and the extension unit, the feed voltage or feed current of the sound signal can be increased, the loudness of the conversation sound is improved, and the function of realizing long-distance work of the telephone exchange is further realized.

Drawings

Fig. 1 is a circuit diagram of a telephone exchange extension apparatus provided in the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, the present invention provides a technical solution: a telephone exchange extension apparatus comprising:

the extension unit is respectively connected with the first input signal and the second signal input end, and is used for performing voltage transformation processing on the first signal and the second signal and outputting the first signal and the second signal;

The extension units are arranged on the input unit and the terminal unit, the output signal passes through the isolation device formed by the transformer and the blocking capacitor, the blocking capacitor can isolate the direct current voltage from the input unit, the transformer can realize the transformation processing of the first signal and the second signal from the input unit, the noise signal in the conversation process can be reduced, the telephone interface of the external input is isolated from the telephone line extension interface of the internal output, and the long-distance conversation work is realized.

In a preferred embodiment, the signal line further comprises a first dc blocking capacitor C1, the first dc blocking capacitor C1 is disposed between the first signal terminal and the extension unit, and a second dc blocking capacitor C2, the second dc blocking capacitor C2 is disposed between the terminal unit and the extension unit; the compensation unit is connected between the terminal unit and the extension unit and used for providing an audio compensation signal; the compensation unit is formed by a constant current device.

The first direct current blocking capacitor C1 is arranged between the first signal end and the extension unit, the first signal can directly isolate the direct current voltage coupling voice signal in the first signal under the action of the first direct current blocking capacitor C1, the first signal C1 is output, the second signal is output after signal coupling transformation processing through the transformer, the first signal is output through the second capacitor C2 in a coupling mode, and the constant current device is arranged between the terminal unit and the extension unit and is used for increasing the current signal, so that the effect of reinforcing the feed current can be achieved, the sound loudness of a user during conversation after off-hook is increased, and the function of realizing long-distance work of the telephone switchboard can be achieved even in a long-distance state.

In a preferred embodiment, the method further comprises: the ringing detection circuit is used for outputting a current signal by the input unit and feeding the current signal back to the ringing exchange generator; an off-hook detection circuit for detecting the current of the ringing current switching generator; the ring current detection circuit comprises a ring current detection device for feeding back a ring current signal, and the ring current signal is fed back to the ring current exchange generator; the off-hook detection circuit comprises an off-hook detection device for feeding back an off-hook detection signal, and the off-hook detection signal is fed back to the off-hook device.

When the ringing current detection circuit is connected, the input current signal passes through the input unit ringing current detection circuit, the ringing current detection circuit is used for feeding back the ringing current signal, the input current signal feeds back the ringing current signal to the ringing current exchange generator through the input telephone line, and the ringing current exchange generator generates ringing current to achieve the purpose of generating the ringing current signal. The off-hook detection circuit comprises an off-hook detection device used for feeding back an off-hook detection signal, the off-hook detection signal is fed back to the off-hook device and used for detecting the off-hook condition of the ringing signal during ringing, and when the circuit is in the off-hook condition, the telephone exchange realizes long-distance work.

The extension units are arranged on the input unit and the terminal unit, the output signal passes through the isolation device formed by the transformer and the DC blocking capacitor, the DC blocking capacitor can isolate the DC signal coupling voice signal, the transformer can realize the DC blocking transmission processing of the first signal and the second signal from the input unit, the noise signal in the conversation process can be reduced, the telephone interface of external input is isolated from the telephone line extension interface of internal output, the remote conversation action is realized, the constant current device is additionally arranged between the terminal unit and the extension units, the feed voltage or feed current of the voice signal can be increased, the loudness of conversation voice is improved, and further the function of realizing the remote work of the telephone switchboard is realized.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A telephone exchange extension apparatus comprising:

the extension unit is respectively connected with the first signal input signal end and the second signal input signal end, and is used for performing transformation processing on the first signal and the second signal and outputting the first signal and the second signal;

2. A telephone exchange extension arrangement according to claim 1, further comprising a first dc blocking capacitor, the first dc blocking capacitor being arranged between the first signal terminal and the extension unit.

3. A telephone exchange extension arrangement according to claim 2, further comprising a second dc blocking capacitor, the second dc blocking capacitor being arranged between the termination unit and the extension unit.

4. A telephone exchange extension device according to claim 1, further comprising a compensation unit connected between the terminal unit and the extension unit for providing an audio compensation signal.

5. A telephone exchange extension device according to claim 4, wherein the compensation unit is formed by a constant current device.

6. A telephone exchange extension apparatus according to claim 1, further comprising:

7. A telephone exchange extension means according to claim 6, wherein the ringing detection circuitry comprises ringing detection means for feeding back a ringing signal, which ringing signal is fed back to the ringing switch generator.

8. A telephone exchange extension device according to claim 6, wherein the off-hook detection circuit comprises off-hook detection means for feeding back an off-hook detection signal, the off-hook detection signal being fed back to the off-hook means.