Adaptive hybrid transform for signal analysis and synthesis
US7516064B2 · kind B2 · utility
39Cited by
10References
24Claims
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Key dates
| Filing date | Feb 19, 2004 |
| Grant date | Apr 7, 2009 |
| Priority date | — |
| Expiry date | Jan 30, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/60
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Analysis and synthesis filter banks such as those used in audio and video coding systems are each implemented by a hybrid transform that comprises a primary transform in cascade with one or more secondary transforms. The primary transforms for the filter banks implement an analysis/synthesis system in which time-domain aliasing artifacts are cancelled. The secondary transforms, which are in cascade with the primary transforms, are applied to blocks of transform coefficients. The length of the blocks is varied to adapt the time resolution of the analysis and synthesis filter banks.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.