Dropped voice packet recovery technique based on edge information

A technology of loss recovery and one voice packet, which is applied in the field of signal processing, can solve the problems of high bandwidth overhead of PCM encoders, and achieve the effects of improving quality, reducing overhead, and greatly compressing

Inactive Publication Date: 2009-02-11
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0009] The present invention solves the problem that the PCM encoder has too much bandwidth overhead based on the packet loss recovery technology at the sending end, and provid

Method used

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  • Dropped voice packet recovery technique based on edge information
  • Dropped voice packet recovery technique based on edge information
  • Dropped voice packet recovery technique based on edge information

Examples

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Example Embodiment

[0029] The present invention will be further introduced below in conjunction with the drawings and embodiments.

[0030] Select a segment of 8s voice file from NTT-AT Chinese voice database. Using 8kHz sampling and 16bitPCM quantization, the size of each voice packet is 20ms. Manually generate packet loss, and use the method in this article to recover the packet loss.

[0031] figure 1 The method of the present invention shown includes virtual recovery at the sending end and extraction of redundant information and actual recovery at the receiving end.

[0032] Such as figure 1 As shown, the sender uses the two voice packets immediately before and after the current voice packet as side information, uses EC (error concealment) technology to perform virtual recovery of the current voice packet, and then uses the minimum mean square error criterion to obtain redundant information, and combines this The redundant information is packaged and transmitted with the latter voice packet; ...

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Abstract

The invention relates to a voice packet loss recovery technique based on side information. The voice packet loss recovery technique can be used in VoIP (Voice over IP) and belongs to the field of network communication. Aiming at a PCM vocoder, the technique integrates a forward error correction (FEC) technique based on a transmission terminal with an error concealment (EC) technique based on a receiving terminal to execute the following steps: selecting a front voice packet and a rear voice packet neighboring the current voice packet as the side information by the transmission terminal, carrying out virtual recovery of the current voice pocket by using the EC technique, acquiring a redundant information according to the least mean-square error rule, packing the redundant information with the rear voice packet and transmitting, and, if the current voice pocket is lost, actually recovering the lost current voice packet by using the side information (the front voice pocket and the rear voice pocket) at the receiving terminal, the redundant information (carried by the rear voice packet) and the EC technique, thereby effectively improving the voice communication quality of IP network under the condition of very small wideband cost.

Description

technical field [0001] The invention relates to the field of signal processing in network voice transmission, in particular to the voice packet loss recovery technology, which is mainly aimed at a PCM vocoder-based voice packet loss recovery technology based on side information. Background technique [0002] The worldwide rapid development of Internet and the advancement of voice signal processing technology have led to the rapid rise of voice services in IP networks. However, the IP protocol used for data packet exchange is not designed for the transmission of real-time data streams. It provides a "best effort" service. In addition to the delay and jitter generated by the network itself, there are also It will lead to the loss of voice packets, which will directly affect the quality of received voice at the receiving end. Therefore, it is very important to adopt an effective voice packet loss recovery technology to obtain high-quality voice services. [0003] Existing rec...

Claims

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Application Information

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IPC IPC(8): H04L1/00H04M7/00
Inventor 赵胜辉李忠博匡镜明王晶
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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