Pattern matching vocoder
US5027404A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 11, 1990 |
| Grant date | Jun 25, 1991 |
| Priority date | — |
| Expiry date | May 11, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L19/0018
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A pattern matching vocoder includes first and second reference pattern memories, a pattern matching processor, and a frame selector. The first pattern memory stores reference vector patterns clustered by a distribution of the number of times of occurrence for spectral envelope vectors of an input speech signal. The second reference pattern memory stores reference vector patterns clustered by pole frequencies, pole bandwidths and a bandwidth of the input speech signal. The pattern matching processor divides the bandwidth of the speech signal into frequency regions and performs pattern matching using, as spectral envelope vectors, power ratios between the frequency regions. The frame selector performs frame selection using, as an evaluation value, a total distortion consisting of a vector distortion caused by pattern matching and a time distortion caused by frame selection with a DP (Dynamic Programming) scheme.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.