Transform speech signal coding with pitch controlled adaptive quantizing
US4184049A · kind A · utility
111Cited by
2References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 25, 1978 |
| Grant date | Jan 15, 1980 |
| Priority date | — |
| Expiry date | Aug 25, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L19/00
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
To improve the speech quality at lower bit rates within a digital communication system in which the coefficients of a frequency transform (e.g. discrete cosine transform) are adaptively encoded with adaptive quantization and adaptive bit-assignment, the adaptation is controlled by a short-term spectral estimate signal formed by combining the formant spectrum and the pitch excitation spectrum of the coefficient signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.