Using word confidence score, insertion and substitution thresholds for selected words in speech recognition
US9478218B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 24, 2008 |
| Grant date | Oct 25, 2016 |
| Priority date | — |
| Expiry date | May 31, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L25/51
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method and system for improving the accuracy of a speech recognition system using word confidence score (WCS) processing is introduced. Parameters in a decoder are selected to minimize a weighted total error rate, such that deletion errors are weighted more heavily than substitution and insertion errors. The occurrence distribution in WCS is different depending on whether the word was correctly identified and based on the type of error. This is used to determine thresholds in WCS for insertion and substitution errors. By processing the hypothetical word (HYP) (output of the decoder), a mHYP (modified HYP) is determined. In some circumstances, depending on the WCS's value in relation to insertion and substitution threshold values, mHYP is set equal to: null, a substituted HYP, or HYP.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.