CELP vocoder with efficient adaptive codebook search
US5265190A · kind A · utility
34Cited by
16References
14Claims
0Family size
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Key dates
| Filing date | May 31, 1991 |
| Grant date | Nov 23, 1993 |
| Priority date | — |
| Expiry date | May 31, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L2019/0014
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A new method for Code Excited Linear Predictive (CELP) coding of speech reduces the computational complexity by removing a convolution operation from a recursive loop used to poll the adaptive code book vectors. In a preferred embodiment, an impulse function of a short term perceptually weighted filter is first convolved with perceptual weighted target speech and the result cross-correlated with each vector in the codebook to produce an error function. The vector having the minimum error function is chosen to represent the particular speech frame being examined.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.