Voice-activated switch
US5430826A · kind A · utility
33Cited by
6References
28Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 13, 1992 |
| Grant date | Jul 4, 1995 |
| Priority date | — |
| Expiry date | Oct 13, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L25/15
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Human speech is detected in an audio signal by first providing a single autocorrelated signal indicative of the audio signal multiplied by a time-delayed portion of the audio signal, the delay being an amount of time indicative of a period corresponding to a first formant frequency. Portions of the autocorrelated signal are compared with a scaled noise value. Human speech is detected by examining whether a plurality of portions of the autocorrelated signal exceed the scaled noise value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.