Method for reducing noise distortions in a speech recognition system
US6173258A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Oct 22, 1998 |
| Grant date | Jan 9, 2001 |
| Priority date | — |
| Expiry date | Oct 22, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L21/0264
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method for reducing noise distortions in a speech recognition system comprises a feature extractor that includes a noise-suppressor, one or more time cosine transforms, and a normalizer. The noise-suppressor preferably performs a spectral subtraction process early in the feature extraction procedure. The time cosine transforms preferably operate in a centered-mode to each perform a transformation in the time domain. The normalizer calculates and utilizes normalization values to generate normalized features for speech recognition. The calculated normalization values preferably include mean values, left variances and right variances.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.