Method for hiding redundant information in G.711 phonetic coding

A G.711, redundant information technology, applied in speech analysis, instruments, etc., can solve the problems of limited telephone bandwidth, uneconomical processing, large amount of calculation, etc., to achieve good voice quality, smooth voice, strong anti-transformation performance. Effect

Active Publication Date: 2009-12-16
网经科技(苏州)有限公司
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AI Technical Summary

Problems solved by technology

Algorithms such as frequency masking area hiding and cepstrum domain hiding have better hiding effects in theory, but the amount of calculation is large, and the bandwidth of the phone is too limited to be processed economically.

Method used

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  • Method for hiding redundant information in G.711 phonetic coding
  • Method for hiding redundant information in G.711 phonetic coding
  • Method for hiding redundant information in G.711 phonetic coding

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Embodiment Construction

[0032]Without changing the original G.711 voice data coding, transmission, and restoration methods, the voice information contains hidden redundant information through buffering and pre-processing before voice coding, and buffering synchronized with decoding is added at the decoding end Synchronous processing with post-processing to restore normal voice. When packet loss occurs, the data containing the characteristics of the lost packet in the adjacent packet is obtained from the buffer, and the main voice signal of the lost packet is reconstructed, so as to realize the compatibility on the basis of G.711 coding. On, enhance the anti-packet loss performance of the call.

[0033] Such as figure 1 As shown, the method for hiding redundant information in G.711 speech coding, the specific process is: ① carry out pre-processing to the speech signal, establish the speech transmission data buffer, transform each piece of speech signal in the buffer to the frequency domain , accordin...

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Abstract

The invention provides a method for hiding redundant information in G.711 phonetic coding. Pre-treatment is carried out before a phonetic packet is coded so that the phonetic packet is provided with hidden information insensitive to human ears, the information contains main features of adjacent other phonetic packets, then normal G.711 mode is used for coding and sending, the same back propagation is carried out for decoding and post-treatment at a receiving end, thus obtaining the original phonetic information. When the data packet is lost, the main phonetic features of the lost packet can be obtained from the adjacent data packets, thus restoring the main phonetic data of the lost packet. While for the device not knowing the hidden algorithm, normal G.711 mode can be directly used for decoding to obtain phonetics approaching the original state, thus the system can be compatible with G.711 code, and can greatly improve the capability of packet losing resistance of phonetic communication and improve communication quality.

Description

technical field [0001] The invention relates to a method for improving voice communication quality in a network packet loss environment and a method for feature extraction and information hiding in sound signals, in particular to a method for hiding redundant information in G.711 voice coding to improve voice anti-packet loss capability. Background technique [0002] VoIP refers to a voice communication technology that makes calls through a packet-switched IP data network. It has the advantages of saving bandwidth, reducing call charges, and being able to integrate with other data services. Due to the characteristics of packet transmission, there is a delay (delayed arrival of voice packets) ), jitter (unpredictable voice packet delay time and arrival sequence) and packet loss (voice packet loss) and other inevitable problems. The basic transmission process of VoIP is that after the sound is converted from analog to digital, the voice encoder converts the digitized voice sig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/00G10L19/02G10L19/005
Inventor 张格伟承成刘继明
Owner 网经科技(苏州)有限公司
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