Low bit rate voice coding method and system
US4933957A · kind A · utility
33Cited by
4References
6Claims
0Family size
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Key dates
| Filing date | Mar 7, 1989 |
| Grant date | Jun 12, 1990 |
| Priority date | — |
| Expiry date | Mar 7, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L2019/0004
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
This low bit rate voice encoding involves short-term predictive filtering the voice signal s(n) using partial correlation related coefficients derived from pre-emphasized s(n), and deriving a short term signal r(n); then deriving a long-term residual signal e(n) by subtracting a delayed synthesized short term b.r'(n-31 M) from said r(n); and code excited encoding e(n) into codeword references k's and associated gains G's.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.