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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.

Inactive Publication Date: 2007-10-03
TSINGHUA UNIV
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Problems solved by technology

Compared with frequency domain interpolation, time domain interpolation method is simpler, but the effect is not as good as frequency domain interpolation

Method used

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  • Error hidden frame reconstruction method based on overlap change compression code
  • Error hidden frame reconstruction method based on overlap change compression code
  • Error hidden frame reconstruction method based on overlap change compression code

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Embodiment Construction

[0214] Take single frame errors as an example. When the error detection device indicates that there is an error (the present invention does not include the error detection part), the error flag is set, the decoding unit does not decode the error frame, and directly replaces it with an all-zero sequence, so the decoding in Figure 6 appears in the sub-band decoding frame. The phenomenon of the shaded part of the waveform in frame C.

[0215] As shown in Figure 6, when an error occurs in the F2 frame in the audio compression coded frame A, the dotted line part in the overlapped frame B will not be restored, which will result in Er1 and Er2 frame errors in the decoded frame C. During error frame reconstruction, in five frame buffers (shown in Fig. 7) that the present invention establishes, the deposit of data frame is decoded frame C among Fig. C1, B2, B3 store error frames Er1 and Er2, and B4 stores the adjacent correctly decoded frame C4 after the error frame.

[0216] In the ...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/02G10L19/005G10L19/018
Inventor 贾晓军窦维蓓张树华
Owner TSINGHUA UNIV
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