Adaptive method and apparatus for coding speech
US4790016A · kind A · utility
100Cited by
7References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 14, 1985 |
| Grant date | Dec 6, 1988 |
| Priority date | — |
| Expiry date | Nov 14, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L19/02
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
In a speech coding system, scale factors are generated and encoded for each of a plurality of subbands of a Fourier transform spectrum of speech. Based on those scale factors, the spectrum is equalized. Coefficients of a limited number of subbands determined by the scale factors are encoded. The number of bits used to encode each coefficient of each transmitted subband is determined by the scale factor for each subband. At the receiver, coefficients of subbands which are not transmitted are approximated by means of a list replication technique.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.