Method of calculating line spectral frequencies
US6760740B2 · kind B2 · utility
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5References
14Claims
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Key dates
| Filing date | Jul 2, 2001 |
| Grant date | Jul 6, 2004 |
| Priority date | — |
| Expiry date | May 3, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L25/24
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
In a method of encoding a source signal by determining Line Spectral Frequencies (LSFs) for representing Linear Predictive Coding (LPC) filter coefficients, real zeros are determined in associated polynomials P″ and Q″ in cos(m&ohgr;), with each polynomial being a series of Chebyshev polynomials, a search for real zeroes being performed by evaluating the associated polynomials in a series of steps of a real variable u, an approximation of cos(m&ohgr;) as a function of the real variable u being employed.
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