Coding, decoding and transcoding methods
US6369722B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 17, 2000 |
| Grant date | Apr 9, 2002 |
| Priority date | — |
| Expiry date | Mar 17, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M7/42
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
On the basis of a portion of the signal, a coder selects a parameter vector belonging to a reference library containing 2Q vectors each designated by an address of Q bits. This coder, or a transcoder located downstream, forms a digital data stream (&PHgr;) containing an index deduced from the address of the vector selected. For each rate value corresponding to an integer p≧0, the index contained in the digital data stream is formed of Q−p bits which, completed by p bits of predetermined positions, define indices of Q bits representing a group of 2p addresses including that of the vector selected from the reference library. The decoder receiving the digital data stream, or a transcoder located upstream, is capable of reconstructing appropriate parameter vectors on the basis of the truncated index. Thus very fine steps are obtained in the adjustment of the transmission rate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.