Low-delay transform coding using weighting windows
US8615390B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 18, 2007 |
| Grant date | Dec 24, 2013 |
| Priority date | — |
| Expiry date | Jun 23, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L19/022
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The invention relates to transform coding/decoding of a digital audio signal represented by a succession of frames, using windows of different lengths. For the coding within the meaning of the invention, it is sought to detect (51) a particular event, such as an attack, in a current frame (Ti); and, at least if said particular event is detected at the start of the current frame (53), a short window (54) is directly applied in order to code (56) the current frame (Ti) without applying a transition window. Thus, the coding has a reduced delay in relation to the prior art. In addition, an ad hoc processing is applied during decoding in order to compensate for the direct passage from a long window to a short window during coding.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.