Encoder of a multi-pulse type capable of optimizing the number of excitation pulses and quantization level
US4881267A · kind A · utility
9Cited by
2References
5Claims
0Family size
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Key dates
| Filing date | May 16, 1988 |
| Grant date | Nov 14, 1989 |
| Priority date | — |
| Expiry date | May 16, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L19/10
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
In a multipulse-excitation system, the number of pulses versus the number of quantization levels are adjusted as a function of speech signal power, for example, voiced sound is high power and needs only a few pulses, but large number of quantization levels, versus the reverse for unvoiced sound.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.