Error hidden frame reconstruction method based on overlap change compression code

A technology of compression coding and lap transform, applied in speech analysis, instruments, etc., can solve the problem that the effect is not as good as frequency domain interpolation.
CN101046964AInactive Publication Date: 2007-10-03TSINGHUA UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
TSINGHUA UNIV
Publication Date
2007-10-03
Estimated Expiration
Not applicable · inactive patent

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Abstract

The present invention belongs to the field of voice-frequency signal processing technology, it is characterized by that it successively contains the following steps: extracting time-domain transient characteristics in signal subband interior, and extracting interframe spectrum related characteristics; utilizing time-domain transient state and interframe spectrum related value to divide error frame into two stages according to the state, it contains 10 states; according to different error frame state selecting interpolation method to generate frequency spectrum coefficient and frequency domain phase of error frame, calculating time-domain signal and front and rear edge smoothing treatment.
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Description

technical field

[0001] The invention relates to digital processing and restoration of compressed audio signals, and its realization. The invention belongs to the field of audio signal processing. Background technique

[0002] Audio error concealment technology is a technology based on the characteristics of audio signals, combined with the characteristics of human physiological and psychological systems, to recover and estimate the lost information caused by transmission errors. The player uses audio error concealment processing to reduce the degree of sound quality damage and achieve the purpose of improving the audio quality of the receiving end.

[0003] In audio signal processing, subband coding and transform coding are usually used to achieve the purpose of compressing audio signals. The conventional digital audio signal coding and decoding devices using sub-band coding are shown in Fig. 1 and Fig. 3 . In the encoder, the analysis filter divides the input signal into...

Claims

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