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Method for automatically adapting levels of signal exchanged in communication network

A signal level, automatic ground technology, applied in the direction of telephone communication, electrical components, voice amplifier applications, etc., can solve the problems of no access, unsuitable compensation, etc.

Inactive Publication Date: 2003-12-10
THOMSON MULTIMEDIA SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] This solution is not suitable for compensating signals exchanged by digital equipment, which needs to be isolated from the user loop, so it does not have a direct voltage or current measurement through a transmission line impedance Z L Access

Method used

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  • Method for automatically adapting levels of signal exchanged in communication network
  • Method for automatically adapting levels of signal exchanged in communication network
  • Method for automatically adapting levels of signal exchanged in communication network

Examples

Experimental program
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Embodiment Construction

[0031] figure 2 A link connection between a subscriber's equipment 3 and a telephone exchange 4 via a transmission line 6 represented by its impedance ZL is schematically illustrated. The subscriber transmits a signal IN1 and receives a signal OUT2, while the telephone exchange 4 transmits a signal IN2 and receives a signal OUT1.

[0032] In order to avoid attenuation of the signals IN1 and OUT2 due to the impedance of the transmission line 6, and to maintain the transfer function of the signal IN1 at the node VL2, as well as the transfer function of the signal OUT2 independent of the line impedance, the method according to the invention comprises a digital entry The signal steps of the device, a step of estimating the transfer function K as a function of the exchanged signals OUT2 and IN1, followed by a step of multiplying each signal with an appropriate gain based on the previously determined value of the transfer function K.

[0033] When the signal IN1 is transmitted, th...

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Abstract

The invention concerns a method and a device for automatically adapting the levels of signals exchanged in a telephone network, between a first set and a second set. The method is characterised in that it consists in the following steps: digitising the signal (OUT2) coming from the transmission line (6) and received by the first set (2); on the basis of the digital data translating the signals (IN1, OUT2) exchanged with the transmission line (6), estimating the transfer function (K) equal to the ratio of the signal (OUT2) received by the first set over the signal (IN1) transmitted by the first set; respectively multiplying each of the exchanged signals (IN1, OUT2) by an appropriate gain (G1, G2) determined on the basis of the estimated value of said transfer function (K). The invention is particularly applicable to telephones, videophones, fax machines or computers connected to a communication network.

Description

technical field [0001] The invention relates to a method for automatically matching various devices, such as a telephone connected in a communication network, a video phone (a system for transmitting voice and video through a telephone network), a fax machine or a computer for exchanging signals level method. The invention also relates to an automatic matching device. [0002] In particular, the invention relates to a method for automatically adapting the switching signal level in a telephone network. Background technique [0003] figure 1 A schematic diagram of a subscriber loop 2 connecting a subscriber to a telephone exchange 4 is shown in a known telephone network configuration. The subscriber transmits a signal IN1 and receives a signal OUT2 via a transmission line 6 whose impedance is ZL. This impedance has an adverse effect on the signal exchange between the subscriber and the telephone exchange. [0004] One solution for correcting the distortion caused by an an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04M1/76H04B3/04H04M1/60H04M3/40H04M7/04H04Q1/54
CPCH04M3/40
Inventor 克里斯托夫·洛兰
Owner THOMSON MULTIMEDIA SA
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