Speech detecting method
US4401849A · kind A · utility
16Cited by
4References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 23, 1981 |
| Grant date | Aug 30, 1983 |
| Priority date | — |
| Expiry date | Jan 23, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L25/00
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Speech signal presence is decided if total signal power is above a first threshold, and if either low or high frequency components exceed thresholds as a large fraction of the total power. Total power is calculated as the zero-order auto-correlation coefficient, and fractional power of frequency components is calculated as the first-order partial auto-correlation coefficient.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.