Multi-state speech encoder and decoder
US4704730A · kind A · utility
23Cited by
7References
26Claims
0Family size
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Key dates
| Filing date | Mar 12, 1984 |
| Grant date | Nov 3, 1987 |
| Priority date | — |
| Expiry date | Mar 12, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L19/08
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Audio signals are analyzed for predictable components (reflection coefficients) and non-predictable (residual) components. The original signal state, over a short-term interval of samples (packet) is defined as one of four states: Silence, Hiss, Sigma, or Peaky. The state determines the step-size encoding of the residual quantized signal, which can therefor be encoded more efficiently.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.