Efficient spectral envelope coding using variable time/frequency resolution and time/frequency switching
US6978236B1 · kind B1 · utility
121Cited by
7References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 26, 2000 |
| Grant date | Dec 20, 2005 |
| Priority date | — |
| Expiry date | Jan 26, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L25/18
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The present invention provides a new method and an apparatus for spectral envelope encoding. The invention teaches how to perform and signal compactly a time/frequency mapping of the envelope representation, and further, encode the spectral envelope data efficiently using adaptive time/frequency directional coding. The method is applicable to both natural audio coding and speech coding systems and is especially suited for coders using SBR [WO 98/57436] or other high frequency reconstruction methods.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.