Packet loss concealment for sub-band predictive coding based on extrapolation of sub-band audio waveforms
US8000960B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 15, 2007 |
| Grant date | Aug 16, 2011 |
| Priority date | — |
| Expiry date | Jun 2, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L19/04
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A technique is described for concealing the effect of a lost frame in a series of frames representing an encoded audio signal in a sub-band predictive coding system. In accordance with the technique, a first synthesized sub-band audio signal is synthesized, wherein synthesizing the first synthesized sub-band audio signal comprises performing waveform extrapolation based on a stored first sub-band decoded audio signal. A second synthesized sub-band audio signal is also synthesized, wherein synthesizing the second synthesized sub-band audio signal comprises performing waveform extrapolation based on the stored second sub-band decoded audio signal. The first synthesized sub-band audio signal and the second synthesized sub-band audio signal are combined to generate a synthesized full-band output audio signal corresponding to a lost frame.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.