Voice data post-processing method capable of inhibiting network packet loss influences
A voice data and audio data packet technology, applied in voice analysis, instruments, etc., can solve problems such as large memory, affecting the real-time performance of voice playback, data packet loss, etc., achieving low complexity, improving subjective auditory experience, and low latency. Effect
Active Publication Date: 2013-06-12
ANHUI CREARO TECH
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Patent [1] is mainly based on identifying and replacing the wrong voice parameters for transmission to perform voice processing, while UDP-based data transmission is generally data packet loss, and the situation of data packet content error is very rare; patent [2], patent [ 3] The purpose is to reduce the impact of data packet loss, but the ideas adopted by these two methods are to restore the voice data of lost data packets through curve fitting, waveform interpolation, linear prediction and other methods. Such processing ideas are generally To buffer several data packets before and after the lost data packet for processing, more memory is required, and it will affect the real-time performance of voice playback
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[0017] A voice data post-processing method for suppressing the impact of network packet loss, characterized in that: comprising the following steps:
[0018] (1), record each audio data packet as P, each data packet is composed of M sampling points, and the amplitude of the mth sampling point is recorded as P(m), m=0,...,M-1 ;
[0019] (2) For a newly received data packet, if it judges that there is no data loss between the last received data packet and the last received data packet through the method of the data packet sequence number, the playback of this data packet will be played in the normal way. , and buffer this data packet; if this data packet is judged to have data loss between the last received data packet by means of the data packet sequence number, record the last received data packet as P B , record the data packet received this time as P N ;
[0020] (3), if the amplitude of a point m is greater than the amplitude of the two points before and after, we call i...
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The invention discloses a voice data post-processing method capable of inhibiting network packet loss influences, comprising the following main steps of: a, when a data packet is lost, selecting two appropriate extreme points in a cached data packet and the currently received data packet; b, respectively fitting the two selected extreme points by adopting a sine function; and c, correcting amplitude of a sampling point between the two extreme points by adopting linear combination of two fitted sine functions, and taking a corrected data packet as a playing data packet. By adopting the voice data post-processing method disclosed by the invention, high frequency noise introduced under the condition that the data packet is lost during a network transmission process can be inhibited, and subjective hearing experience is improved.
Description
technical field [0001] The invention relates to a voice data post-processing method, in particular to a voice data post-processing method for suppressing the influence of network packet loss. Background technique [0002] With the rapid development of the Internet in recent years, various applications and products based on network audio and video technology such as video conferencing, video surveillance, and VOIP have been rapidly promoted. When audio data is transmitted on the network, in order to ensure real-time performance, most applications are transmitted based on UDP. The characteristic of UDP transmission data is that the integrity of the load data cannot be guaranteed during transmission. Therefore, packet loss will inevitably occur in the transmitted audio data. If the data after packet loss is not processed, direct playback will introduce a lot of high-frequency noise, which will affect the subjective auditory experience. People have carried out relevant resear...
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IPC IPC(8): G10L21/0208G10L19/005G10L21/007
Inventor 何佳王小敏王大勇尼秀明
Owner ANHUI CREARO TECH