System and method for noise reduction using bi-orthogonal modified discrete cosine transform
US6636830B1 · kind B1 · utility
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Key dates
| Filing date | Nov 22, 2000 |
| Grant date | Oct 21, 2003 |
| Priority date | — |
| Expiry date | Feb 13, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B20/00007
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The invention provides a perceptual audio signal compression system and method. One aspect of the invention described herein includes transforming the signal into a plurality of bi-orthogonal modified discrete cosine transform (BMDCT) frequency coefficients using a bi-orthogonal modified discrete cosine transform; quantizing the BMDCT frequency coefficients to produce a set of integer numbers which represent the BMDCT frequency coefficients; and encoding the set of integer numbers to lower the number of bits required to represent the BMDCT frequency coefficients.
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