Efficient spectral envelope coding using variable time/frequency resolution and time/frequency switching
US7181389B2 · kind B2 · utility
32Cited by
10References
14Claims
0Family size
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Key dates
| Filing date | Oct 11, 2005 |
| Grant date | Feb 20, 2007 |
| Priority date | — |
| Expiry date | Oct 11, 2025 |
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.