Voice activity detector for speech signals in variable background noise
US5649055A · kind A · utility
115Cited by
9References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 29, 1995 |
| Grant date | Jul 15, 1997 |
| Priority date | — |
| Expiry date | Sep 29, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L2025/786
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A voice activity detector (VAD) which determines whether received voice signal samples contain speech by deriving parameters measuring short term time domain characteristics of the input signal, including the average signal level and the absolute value of any change in average signal level, and comparing the derived parameter values with corresponding thresholds, which are periodically monitored and updated to reflect changes in the level of background noise, thereby minimizing clipping and false alarms.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.