Device for perceptual weighting in audio encoding/decoding

A perception and equipment technology, applied in the field of perception weighting equipment, can solve the problem of complex calculation time of filters
CN101385079AInactive Publication Date: 2009-03-11FRANCE TELECOM SA
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Applications(China)
Current Assignee / Owner
FRANCE TELECOM SA
Publication Date
2009-03-11
Estimated Expiration
Not applicable ยท inactive patent

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Abstract

The invention relates to a hierarchical audio encoder in a frequency band divided into a first sub-band and a second sub-band which are adjacent to each other, said encoder comprising: a core encoder (305) for encoding an original signal in the first sub-band of the frequency band; a calculation stage (306) for calculating a residual signal {e} from the original signal and from the signal supplied by the core encoder; and a device (307) for perceptual weighting of the residual signal {e}. According to the invention, the perceptual weighting device comprises a perceptual weighting filter (307) with gain compensation that can perform the spectral continuity between the signal at the output of the perceptual weighting filter with gain compensation and the signal in the second sub-band. The invention can be applied to the transmission and storage of digital signals, such as the audio-frequency signals of speech, music, etc.
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Description

technical field

[0001] The present invention relates to a perceptual weighting device for encoding / decoding audio signals in a given frequency band. It also relates to a hierarchical audio encoder and a hierarchical audio decoder comprising the encoding / decoding device of the invention.

[0002] The invention has particularly advantageous application in the transmission and storage of digital signals such as audio speech, music, etc. signals. Background technique

[0003] Various techniques exist for digitizing and compressing audio speech, music, etc. signals. The most common methods are:

[0004] "Waveform coding" methods such as PCM and ADPCM coding;

[0005] "parametric analysis / synthetic coding" methods, such as Codebook Excited Linear Prediction (CELP) coding;

[0006] โ€ข "Subband or Transform Perceptual Coding" method.

[0007] These conventional techniques for encoding audio-frequency signals are described in "Speech Coding and Synthesis", editors W.B. Kleijn and...

Claims

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