Method for reducing influence caused by echo to subjective perception in VoIP communication

A technology of subjective feeling and communication mode, applied in the direction of telephone communication, two-way sound reinforcement telephone system, interconnection device, etc., it can solve the problem of complicated external lines, the echo canceler of the access equipment cannot converge well, and the echo path is nonlinear. And other issues

Active Publication Date: 2008-06-25
ZTE CORP
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0008] For the access device, the situation of the external line is very complicated. Even if the echo canceller of the access device conforms to G.16

Method used

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  • Method for reducing influence caused by echo to subjective perception in VoIP communication
  • Method for reducing influence caused by echo to subjective perception in VoIP communication
  • Method for reducing influence caused by echo to subjective perception in VoIP communication

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Embodiment Construction

[0026] First, let me introduce that there are currently many communication methods in the industry that can be used to exchange information between access devices, such as RTCP-APP packets, and RTP extension headers. The embodiment of the present invention adopts the RTCP-APP package to introduce, and expands the RTCP-APP package to an in-band communication mode, which is used for exchanging parameters related to media streams and control messages between access devices. Refer to attached Figure 4 It can be seen that the extended RTCP-APP packet consists of two parts: media stream parameters and control messages. The parameters of the media flow include the gain from the IP side to the TDM side, the gain from the TDM side to the IP side, ERL, and Acom. Control messages are divided into request, response, and empty; the function of the request message is to request the peer to adjust parameters, including reducing the packaging interval of media packets, reducing the jitter b...

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Abstract

The invention discloses a method to lower the influence of an echo on subjective sensation in VoIP communication, and solves the problem that the echo reflected back by a far-end Acom causes a passive influence on the hearing sense of a near-end user. The method includes the steps that device detection is cut in to detect the actual attenuation of the echo and the circulating time delay of the echo; when the cut-in device of the local end finds that the echo is higher, the cut-in device of the local end adjusts the own parameter, and informs the cut-in device of the opposite end through a band inside or a band outside communication way to adjust the parameter in order to lower the circulating time delay of the echo, and reduces the influence caused by the echo reflected back from the cut-in device of the opposite end on the subjective sensation of the local end user. The invention adopts the measures of adjusting the packaging interval of the medium packages and the size of a Jitter Buffer, switching a phonetic code-decode algorithm, and closing the silence detection, etc. to improve the passive influence of the echo on the user.

Description

technical field [0001] The invention relates to the technical field of VoIP communication, in particular to a method for reducing the influence of echo on the subjective experience of users during the VoIP communication process. Background technique [0002] In recent years, telecom operators have built many VoIP networks. Compared with the PSTN network, the VoIP network has the advantages of flexible networking and low cost. However, due to its own defects, such as long delay, packet loss and jitter, the voice quality carried by the VoIP network is worse than that of the PSTN network. In addition, some problems that could be ignored in the PSTN network have become prominent in the VoIP network. The echo generated by the mismatch between the terminal impedance and the input impedance of the 2 / 4 conversion circuit of the access device has always existed in the PSTN network. However, due to the low delay of the PSTN network, the echo reflected from the opposite end will affec...

Claims

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Application Information

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IPC IPC(8): H04M1/20H04M1/19H04M7/00H04M9/08H04B3/23
Inventor 汪涛
Owner ZTE CORP
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