Global masking thresholding for use in perceptual coding
US5717764A · kind A · utility
33Cited by
8References
8Claims
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Key dates
| Filing date | Sep 6, 1995 |
| Grant date | Feb 10, 1998 |
| Priority date | — |
| Expiry date | Sep 6, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/665
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A five-channel perceptual audio compression system which encodes five matrixed channels switches among a fourteen encoding modes each utilizing a respective different set of matrixed channels. Six of the modes are for encoding the three front channels and eight of the modes are for encoding the two back channels. The rate of perceptual encoding the matrixed channels is controlled by adjusting individual noise thresholds as a function of a global masking threshold.
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