Automatic speech recognition method and apparatus, using non-linear envelope detection of signal power spectra
US7877252B2 · kind B2 · utility
0Cited by
4References
28Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 18, 2007 |
| Grant date | Jan 25, 2011 |
| Priority date | — |
| Expiry date | Oct 30, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L19/02
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An automatic speech recognition method includes converting an acoustic signal into a digital signal; determine a power spectrum of at least one portion of the digital signal; and non-linearly determining envelope values of the power spectrum at a plurality of respective frequencies, based on a combination of the power spectrum with a filter function. Non-linearly determining envelope values involves calculating each envelope value based on a respective number of values of the power spectrum and of the filter function and the respective number of values is correlated to the respective frequency of the envelope value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.