Noise-compensated speech recognition templates
US6381569B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 4, 1998 |
| Grant date | Apr 30, 2002 |
| Priority date | — |
| Expiry date | Feb 4, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L21/0216
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The speech recognition training unit is modified to store digitized speech samples into a speech database that can be accessed at recognition time. The improved recognition unit comprises a noise analysis, modeling, and synthesis unit which continually analyzes the noise characteristics present in the audio environment and produces an estimated noise signal with similar characteristics. The recognition unit then constructs a noise-compensated template database by adding the estimated noise signal to each of the speech samples in the speech database and performing parameter determination on the resulting sums. This procedure accounts for the presence of noise in the recognition phase by retraining all the templates using an estimated noise signal with similar characteristics as the actual noise signal that corrupted the word to be recognized. This method improves the likelihood of a good template match, which increases the recognition accuracy.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.