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Method and device for realizing packet loss concealment

A technology for packet loss concealment and lost frames, which is applied in the field of network communication, can solve the problems of phase discontinuity, weak correlation, amplitude discontinuity, etc., and achieve the effect of eliminating frequency multiplication problems, enhancing correlation, and improving phase continuity

Active Publication Date: 2010-09-15
HUAWEI DEVICE CO LTD
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Problems solved by technology

Since the pitch period in the audio signal also changes gradually, the farther the data is from the lost frame, the weaker the correlation with the lost frame is, and only the data before the lost frame is used to compensate the lost frame, which may be between the lost frame and its Phase discontinuity occurs where the frames are connected
[0030] 3) When the lost frame occurs in a place where there is a voice gradient, only the previous pitch period data of the lost frame is used to restore the lost frame data, and the phenomenon of amplitude discontinuity will occur

Method used

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  • Method and device for realizing packet loss concealment
  • Method and device for realizing packet loss concealment
  • Method and device for realizing packet loss concealment

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Embodiment Construction

[0083] The embodiments of the present invention mainly improve the existing packet loss concealment technology, so as to reduce the problems of pitch period estimation error, phase discontinuity, and amplitude discontinuity when compensating for lost frames in the prior art.

[0084] Firstly, an embodiment of the present invention improving the existing pitch period estimation method will be described.

[0085] As mentioned earlier, voiced sound is periodic, and the period is P, that is, the pitch period is P, so in figure 2 , the periodicity of the sampling point data x in HB can be expressed by formula (5):

[0086] x(m)≈x(m+P) (5)

[0087] And because the autocorrelation function of the periodic function has the same periodic characteristics as the periodic function, the periodicity of the correlation function shown in formula (1) can be expressed by formula (6):

[0088] CR(k)=CR(k+P) (6)

[0089] Therefore, by figure 2 The best matching point found by the method sho...

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Abstract

The embodiment of the invention discloses a method and a device for realizing packet loss concealment. Correlation between recovered lost frame data and data after frame loss is enhanced by the technical scheme for recovering lost frames by combining the data before the frame loss with the data after the frame loss so as to improve the continuity of phases between the recovered lost frame data and the data after the frame loss and improve the quality of voice data.

Description

[0001] This application is a divisional application for the application file with the application number 200710126165.3, the application date is June 14, 2007, and the title is "a method and device for realizing packet loss concealment". technical field [0002] The invention relates to the technical field of network communication, in particular to a method and device for realizing packet loss concealment. Background technique [0003] Originally, IP networks were designed for transporting data streams that contained relatively large packets and did not require real-time, reliable delivery. And now the voice data is also transmitted in the IP network. Voice transmission requires real-time and reliable transmission of small voice packets. When a voice packet is dropped during transmission, there is usually no time to retransmit the dropped packet. In addition, when a voice packet has gone through a long route and cannot arrive in time when it needs to be played, this packet ...

Claims

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Application Information

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IPC IPC(8): G10L19/00G10L11/04G10L21/003
Inventor 詹五洲王东琦
Owner HUAWEI DEVICE CO LTD
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