Speech recognition
US6138095A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 3, 1998 |
| Grant date | Oct 24, 2000 |
| Priority date | — |
| Expiry date | Sep 3, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L15/08
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Speech recognition in which the log probabilities of the null and alternative hypothesis are computed for an input speech sample by comparison with specific stored speech vocabularies/grammars and with general speech characteristics. The difference in probabilities is normalized by the magnitude of the null hypothesis to derive a likelihood factor which is compared with a rejection threshold that is utterance-length dependent. Advantageously, a high-order polynomial representation of the rejection threshold length dependency may be simplified by a series of piece-wise constants which are stored as rejection thresholds to be selected in accordance with the length of the input speech sample.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.