Coding techniques using estimated spectral magnitude and phase derived from MDCT coefficients
US6980933B2 · kind B2 · utility
45Cited by
17References
44Claims
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Key dates
| Filing date | Jan 27, 2004 |
| Grant date | Dec 27, 2005 |
| Priority date | — |
| Expiry date | Feb 11, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L19/0212
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Estimates of spectral magnitude and phase are obtained by an estimation process using spectral information from analysis filter banks such as the Modified Discrete Cosine Transform. The estimation process may be implemented by convolution-like operations with impulse responses. Portions of the impulse responses may be selected for use in the convolution-like operations to trade off between computational complexity and estimation accuracy. Mathematical derivations of analytical expressions for filter structures and impulse responses are disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.