Method of distinguishing voice from noise
US4920568A · kind A · utility
15Cited by
6References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 11, 1988 |
| Grant date | Apr 24, 1990 |
| Priority date | — |
| Expiry date | Oct 11, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L25/78
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An inputted sound signal is sampled at intervals over a period and cepstrum coefficients are calculated from the sampled values. Cepstrum sum, distance and/or power are calculated and compared with appropriately preselected threshold values to distinguish voice (vowel) intervals and noise intervals. The ratio of the length of the voice intervals to the sampling period is considered to determine whether the sampled inputted sound signal represents voice or noise.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.