Subband decoding method and apparatus
US5054075A · kind A · utility
66Cited by
11References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 5, 1989 |
| Grant date | Oct 1, 1991 |
| Priority date | — |
| Expiry date | Sep 5, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/667
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An subband coding system encoder is provided for improving the quality of a reconstructed speech signal. Briefly, the improved subband coding system encoder includes means for improving the selection of the waveform/noise fill gain factor. The improved selection method, according to the invention, is based on the quasi-stationary characteristic of speech, that is, that the short-time frequency spectrum of a speech signal varies slowly with time. Moreover, the amount of fill energy is adaptively determined for each subband according to the shape of the frequency spectrum for each speech frame.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.