Perceptual, scalable audio compression

Details Perceptual, scalable audio compression Perceptual, scalable audio compression

2006-03-03

2010-11-16

Lerner, Martin (Department: 2626)

Data processing: speech signal processing, linguistics, language

Speech signal processing

Psychoacoustic

C704S229000, C704S501000

Reexamination Certificate

active

07835904

ABSTRACT:
The perceptual scalable audio coding/decoding technique lies in the use of a psychoacoustic mask to guide residue coding in enhancement layer coders. At the encoder, a psychoacoustic mask is calculated for the enhancement layer coders or is simply extracted from the coded base layer bitstream. One can also decode the coded base layer bitstream into the audio waveform, and calculate the psychoacoustic mask from the decoded base layer waveform. Furthermore, a predictive technology can be used to refine the psychoacoustic mask derived from the base layer bitstream to form a more accurate psychoacoustic mask of the enhancement layer. In addition, one can calculate the enhancement layer psychoacoustic mask from the original audio, and send the difference between the enhancement layer psychoacoustic mask and the base layer psychoacoustic mask as side information to the decoder. This psychoacoustic mask may then be used for the perceptual coding and decoding of the residue.

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