Coding techniques using estimated spectral magnitude and phase derived from MDCT coefficients
USRE42935E1 · kind E1 · reissue
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Key dates
| Filing date | Dec 21, 2007 |
| Grant date | Nov 15, 2011 |
| Priority date | — |
| Expiry date | Dec 21, 2027 |
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- Technology area (CPC —)General
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.
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