Two-staged cohort selection for speaker verification system
US6205424A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 31, 1996 |
| Grant date | Mar 20, 2001 |
| Priority date | — |
| Expiry date | Jul 31, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L17/04
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Speech signals from speakers having known identities are used to create sets of acoustic models. The acoustic models along with their corresponding identities are stored in a memory. A plurality of sets of cohort models that characterize the speech signals are selected from the stored sets of acoustic models, and linked to the set of acoustic models of each identified speaker. During a testing session speech signals produced by an unknown speaker having a claimed identity are processed to generate processed speech signals. The processed speech signals are compared to the set of models of the claimed speaker to produce first scores. The processed speech signals are also compared to the sets cohort models to produce second scores. A subset of scores are dynamically selected from the second scores according to a predetermined criteria. The unknown speaker is validated as the claimed speaker if the difference between the first and a combination of the subset of scores is greater than a predetermined threshold value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.