High-speed search method for LSP quantizer using split VQ and fixed codebook of G.729 speech encoder
US7389227B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 28, 2000 |
| Grant date | Jun 17, 2008 |
| Priority date | — |
| Expiry date | Feb 3, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L2019/0005
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A high-speed search method in a speech encoder using an order character of LSP (Line Spectrum Pair) parameters in an LSP parameter quantizer using SVQ (Split Vector Quantization) used in a low-speed transmission speech encoder, includes the steps of rearranging a codebook according to an element value of a reference row for determining a range of code vectors to be searched; and determining a search range by using an order character between a given target vector and an arranged code vector to obtain an optimal code vector. The method gives effects of reducing computational complexity required to search the codebook without signal distortion in quantizing the LSP parameters of the speech encoder using SVQ, and reducing computational complexity without loss of tone quality in G.729 fixed codebook search by performing candidate selection and search on the basis of the correlation value size of the pulse position index.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.