Speech playback speed change using wavelet coding, preferably sub-band coding
US6009386A · kind A · utility
19Cited by
13References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 28, 1997 |
| Grant date | Dec 28, 1999 |
| Priority date | — |
| Expiry date | Nov 28, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L25/27
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method of speeding up playback of a digitized audio signal without raising the pitch and without introducing discontinuities in the speech signal, comprises sub-band coding (SBC) consecutive blocks of the audio signal with standard SBC or wavelet compression to derive frames of data. Next periodic adjacent pairs of the frames are dropped to leave a stream of remaining frames. A sped up approximation of the digitized audio signal is then reconstructed by sub-band decoding consecutive remaining frames. The method can also be used to slow speech playback by replicating, rather than dropping, adjacent pairs of frames.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.