Method for flexible bit rate code vector generation and wideband vocoder employing the same
US7529663B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 30, 2005 |
| Grant date | May 5, 2009 |
| Priority date | — |
| Expiry date | Jun 13, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L19/24
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Provided are a flexible bit rate code vector generation method and a wideband vocoder employing the same. This invention implements a flexible bit rate by getting three code vectors which are composed of 24, 16, and 8 pulses, at a time in a search process, through improvement of an algebraic codebook search process in a wideband AMR-WB vocoder. The method includes the steps of: performing a preprocess, wherein the preprocess divides a sub-frame by tracks and decides a pulse position having a maximum value in each track; among a plurality of pulses to be searched, fixing a same number of pulses as the tracks to the position with the maximum value of each track sequentially, and searching optimal positions having a minimum error with a target signal by combining two pulses in two consecutive tracks for the remaining pulses; and creating a code vector with flexible bit rate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.