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Method and device for concealing lost packages

A technology for concealing packet loss and losing signals, which is applied in the field of network communication, and can solve problems such as stiff and uniform sound, affecting audio quality, etc., and achieve the effect of quality improvement

Inactive Publication Date: 2011-09-14
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, in the process of completing the present invention, the inventor found that the prior art still has the following problems: since the existing packet loss concealment method is to generate the lost frame signal by repeatedly copying the pitch waveform of the historical signal, the lost frame The size of multiple pitch periods is still the same, and there is no "jitter" characteristic of human voice, that is, there is no gradual change in the pitch period, resulting in a relatively blunt, distorted sound, and even noise, which affects audio quality

Method used

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  • Method and device for concealing lost packages

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Embodiment 1

[0040] The embodiment of the present invention uses a non-equidistant interpolation method to perform interpolation processing on the reconstructed signal, so that the interval between interpolation time points is gradually reduced, and a reconstructed signal with a gradually larger pitch period is obtained; or the interval between interpolation time points is gradually increased , Get the reconstructed signal that the pitch period gradually becomes smaller; this can ensure the continuity of the frequency.

[0041] Embodiment 1 of the present invention provides a method for concealing packet loss, which implements waveform companding by setting the interpolation time point of the interval gradual change, which realizes the gradual change of the pitch frequency within the lost frame. In this embodiment, the first decoded signal and the second decoded signal respectively correspond to the intact signals on both sides of the lost frame after decoding, that is, the first decoded signa...

Embodiment 2

[0080] The embodiment of the present invention provides a method for concealing packet loss, which combines the pitch period of the signals on both sides of the lost frame and improves the calculation method of the phase difference so that the pitch period frequency of the lost frame signal and the adjacent intact frame maintains continuity. In this embodiment, the first decoded signal and the second decoded signal respectively correspond to the intact signals on both sides of the decoded lost frame. See Picture 10 ,Specific steps are as follows:

[0081] Step 201: Generate a synthesized signal according to the first decoded signal.

[0082] Step 202: Combining the pitch periods of the first decoded signal and the second decoded signal, determine the phase difference between the synthesized signal and the second decoded signal.

[0083] Step 203: Determine the interval of the interpolation time point according to the phase difference, and perform waveform compression on the synthes...

Embodiment 3

[0115] This embodiment combines the gradual interval interpolation of the synthesized signal in Embodiment 1, and the method of combining the pitch periods of decoded signals on both sides of the missing frame described in Embodiment 2 to achieve the continuity of the pitch period change within and outside the missing frame. Such as Figure 13 As shown, the specific steps are as follows:

[0116] Step 301: Generate a synthesized signal according to the first decoded signal.

[0117] Step 302: Determine the phase difference between the synthesized signal and the second decoded signal by combining the pitch periods of the first decoded signal and the second decoded signal.

[0118] Step 303: According to the phase difference, determine the interpolation time point at which the interval gradually changes, and perform waveform compression on the synthesized signal to obtain a reconstructed signal.

[0119] Step 304: Fill the reconstructed signal into the missing frame.

[0120] In step 302...

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Abstract

The invention discloses a method and a device for concealing lost packages, belonging to the field of network communication and comprising the following steps: generating a first composite signal according to a first decoded signal; determining the phase difference of the first composite signal and a second decoded signal; determining interpolation time points with gradually changed interpolationintervals according to the phase difference, and carrying out the wave shape companding of the first composite signal to obtain a first reconstruction signal; and reconstructing a lost signal betweenthe first decoded signal and the second decoded signal by the first reconstruction signal. The invention solves the problem of discontinuous fundamental period frequency inside a lost frame and enhances the quality of a recovered audio-frequency signal, thereby solving the distortion problem caused by longer lost signal or longer lost frame.

Description

Technical field [0001] The present invention relates to the field of network communication, in particular to a method and device for concealing packet loss in network communication. Background technique [0002] The IP network was originally designed to transmit data streams that contain large packets and do not require real-time reliable transmission, so the real-time and reliability requirements for data transmission are not high. The transmission of voice requires the reliable transmission of smaller packets in real time. In a VoIP (Voice Over Internet Protocal) system, the transmitted packets are small. When a voice packet is lost during transmission, there is usually no time. Retransmit lost packets. When a voice packet goes through a long route and cannot arrive in time when it needs to be played, the packet loses its meaning. Therefore, voice packets that cannot arrive or arrive in time are considered lost. Network packet loss is the main reason for the degradation of v...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/56H04L29/06H04M7/00G10L19/00G10L19/005G10L19/09
CPCG10L19/005G10L19/09
Inventor 詹五洲王东琦
Owner HUAWEI TECH CO LTD