Voice activity detection process and means for implementing said process
US4672669A · kind A · utility
80Cited by
1References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 31, 1984 |
| Grant date | Jun 9, 1987 |
| Priority date | — |
| Expiry date | May 31, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04J3/175
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Speech signal presence is detected in a VAD (Voice Activity Detector) in two steps: (1) Signal energy above a threshold decides presence, below threshold decides ambiguity; (2) ambiguity is resolved by testing the rate of change of spectral parameters.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.