Speech detection in presence of noise by determining variance over time of frequency band limited energy
US5579431A · kind A · utility
22Cited by
7References
17Claims
0Family size
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Key dates
| Filing date | Oct 5, 1992 |
| Grant date | Nov 26, 1996 |
| Priority date | — |
| Expiry date | Oct 5, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L25/78
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The device detects the beginning and ending portions of speech contained within an input signal based on the variance of frequency band limited energy within the signal. The use of the variance allows detection which is relatively independent of an absolute signal-to-noise ratio with the signal, and allows accurate detection within a wide variety of backgrounds such as music, motor noise, and background noise, such as other speakers. The device can be easily implemented using off-the-shelf hardware along with a high-speed special purpose digital signal processor integrated circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.