Adapting noise masking level in analysis-by-synthesis employing perceptual weighting
US5845244A · kind A · utility
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Key dates
| Filing date | May 13, 1996 |
| Grant date | Dec 1, 1998 |
| Priority date | — |
| Expiry date | May 13, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L19/06
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
In an analysis-by-synthesis speech coder employing a short-term perceptual weighting filter with transfer function W(z)=A(z/.gamma..sub.1)/A(z/.gamma..sub.2), the values of the spectral expansion coefficients .gamma..sub.1 and .gamma..sub.2 are adapted dynamically on the basis of spectral parameters obtained during short-term linear prediction analysis. The spectral parameters serving in this adaptation may in particular comprise parameters representative of the overall slope of the spectrum of the speech signal, and parameters representative of the resonant character of the short-term synthesis filter.
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