Method for high quality audio transcoding
US8150685B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 29, 2011 |
| Grant date | Apr 3, 2012 |
| Priority date | — |
| Expiry date | Apr 29, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L19/173
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for a voice transcoder that converts a bitstream representing frames of data encoded according to a first voice compression standard to a bitstream representing frames of data according to a second voice compression standard using perceptual weighting that uses tuned weighting factors, such that the bitstream of a second voice compression standard to produce a higher quality decoded voice signal than a comparable tandem transcoding solution. The method includes pre-computing weighting factors for a perceptual weighting filter optimized to a specific source and destination codec pair, pre-configuring the transcoding strategies, mapping CELP parameters in the CELP parameter space according to the selected coding strategy, performing Linear Prediction analysis if specified by the transcoding strategy, perceptually weighting the speech using with tuned weighting factors, and searching for adaptive codebook and fixed-codebook parameters to obtain a quantized set of destination codec parameters.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.