Speech compression coding with discrete cosine transformation of stochastic elements
US5943644A · kind A · utility
3Cited by
16References
39Claims
0Family size
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Key dates
| Filing date | Jun 18, 1997 |
| Grant date | Aug 24, 1999 |
| Priority date | — |
| Expiry date | Jun 18, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L25/27
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A digital speech waveform is divided into frames and sub-frames. Spectrum envelope information, pitch elements and stochastic elements are extracted and coded for the frames and sub-frames. A second error signal is calculated as a result of subtracting, from the sub-frames, pitch component speech generated from the pitch elements and spectrum envelope elements. The second error signal is coded so as to obtain the stochastic elements as a result of transforming the second error signal into a signal of a frequency domain through discrete cosine transformation and coding coefficients of the transformed domain.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.