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Packet loss hiding method

A packet loss and voice fragment technology, applied in the field of IP network, can solve the problems of voice quality affecting and complex implementation, achieving the effect of small calculation amount, simple implementation and avoiding BEEP

Inactive Publication Date: 2008-02-13
BEIJING SAMSUNG TELECOM R&D CENT +1
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] 3) The extended two reverse pitch cycles require complex processing such as OLA (Overlap Add);
[0010] 4) The implementation is complex and has an impact on voice quality

Method used

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Embodiment Construction

[0038] Experiments show that for a short loss (for example, 10ms), a single Pitch can be simply used to repeatedly construct the required PLC frame (just as G.711Appendix I constructs a 10ms method), but for a long loss, if only a single Pitch is still used to repeat To construct the required PLC frame, the BEEP phenomenon will appear. Experiments show that selecting multiple Pitches to generate the required longer PLC frames can improve the speech quality.

[0039] Therefore a kind of new packet loss concealment PLC method based on multiple Pitch proposed by the present invention, referred to as PLC_MP (Packet Lost Concealment based on Multiple Pitches) method, with reference to Fig. 2, mainly comprises the following steps at the receiving end:

[0040] In step 201 of said figure: for a good speech frame, the result after preserving the speech decoding can be preserved in a circular history buffer (buffer);

[0041] In the 202 steps of described figure: for the first loss fr...

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Abstract

A concealing method of package loss includes five steps. Firstly, for good voice frames, the result of voice decoding is saved; secondly, for a first lost frame, the Pitch is detected in the saved voice data; thirdly, multiple suitable Pitch cycles are selected to construct the lost voice segment L; fourthly, a suitable voice data section and a tail data section in the lost voice segment L are selected to be smoothly processed, and the tail data in the lost voice segment L is replaced; finally, by utilizing the lost voice segment L, a composite PLC frame U corresponding to the first lost frame is generated. Compared with the method recommended by the ITU-T Recommendation G.711-Appendix I, the concealing method has the advantages of simple realization, small amount of computing, no destruction of Pitch cycles and avoidance of phenomena, such as BEEP, converse order, etc. By applying the present invention, the normal calls of a VoIP system can tolerate package loss rate over ten percent. The method disclosed by the present invention not only can be used in a VoIP system but also can be used in other voice-related systems or systems needing to generate lost voice.

Description

technical field [0001] The invention relates to an IP (Internet Protocol) network, in particular to a packet loss concealment method in a real-time multimedia transmission system based on the IP network. Background technique [0002] Real-time transmission of multimedia data on the Internet, such as audio or video streams, is relatively difficult. IP networks are not designed for real-time applications, so network delays, packet loss, and delay jitter all have a serious impact on voice quality. These parameters are related to the location of the sender and receiver. The typical packet loss rate is 0-20%, and the one-way delay is generally 5-500ms. In a normal voice call, some relevant research shows that when the packet loss rate is greater than 5%, and the one-way delay exceeds 400ms, the call becomes more difficult. Therefore, in a VoIP (Voice over IP) system, how to ensure the voice quality of calls is a key issue and also a technical difficulty. In order to solve the a...

Claims

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Application Information

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IPC IPC(8): H04L12/56H04L1/00H04L12/70
Inventor 王春花王炜杨武学
Owner BEIJING SAMSUNG TELECOM R&D CENT
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