Verification score normalization in a speaker voice recognition device
US7409343B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 22, 2003 |
| Grant date | Aug 5, 2008 |
| Priority date | — |
| Expiry date | Dec 6, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L17/12
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
During a learning phase, a speech recognition device generates parameters of an acceptance voice model relating to a voice segment spoken by an authorized speaker and a rejection voice model. It uses normalization parameters to normalize a speaker verification score depending on the likelihood ratio of a voice segment to be tested and the acceptance model and rejection model. The speaker obtains access to a service application only if the normalized score is above a threshold. According to the invention, a module updates the normalization parameters as a function of the verification score on each voice segment test only if the normalized score is above a second threshold.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.