Determining linear predictive coding filter parameters for encoding a voice signal
US6782359B2 · kind B2 · utility
3Cited by
21References
12Claims
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Key dates
| Filing date | May 28, 2003 |
| Grant date | Aug 24, 2004 |
| Priority date | — |
| Expiry date | May 28, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L19/09
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Linear predictive coding (LPC) filter parameters are determined for use in encoding a voice signal. Samples of a speech signal using a z-transform function are pre-emphasized. The pre-emphasized samples are analyzed to produce LPC reflection coefficients. The LPC reflection coefficients are quantized by a voiced quantizer and by an unvoiced quantizer producing sets of quantized reflection coefficients. Each set is converted into respective spectral coefficients. The set which produces a smaller lag-spectral distance is determined. The determined set is selected to encode the voice signal.
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