Transcoder for speech codecs of different CELP type and method therefor
US7472056B2 · kind B2 · utility
1Cited by
8References
9Claims
0Family size
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Key dates
| Filing date | Dec 30, 2003 |
| Grant date | Dec 30, 2008 |
| Priority date | — |
| Expiry date | Jun 24, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L19/12
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A transcoder for use between speech codecs using different Code-Excited Linear Prediction (CELP) type and a method therefor are disclosed. The transcoder includes a decoding unit of an input CELP codec, a transcoding filter, a transcoding filter design unit, and an encoding unit of an output CELP codec. By substituting a post-filter and a perceptual weighting filter of a prior art with one transcoding filter, the calculation amount of the transcoder is reduced, and speech quality decoded at a receiving end is improved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.