System and method for detecting a recorded voice
US6480825B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 29, 1998 |
| Grant date | Nov 12, 2002 |
| Priority date | — |
| Expiry date | Jan 29, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L17/00
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The present invention is a reliable system and method for detecting a recorded voice, which can be employed independently or to provide protection from fraudulent use of a recording to defeat an automatic speaker recognition system. Several techniques and systems are employed either independently or in combination to verify that a detected audio sample is live and not recorded. Temporal speech characteristics of an audio sample are analyzed to determine whether a sample under examination is so similar to a previous sample as to indicate a recording. Communications channel characteristics are examined to determine whether an sample was recorded on a different channel from a predetermined communications channel. A pattern classifier is trained to distinguish between live and recorded speech. Finally, an “audio watermark” is used to determine whether a detected audio sample is a recording of a previous communication by an authorized user. In addition, the various techniques of the present invention may be employed in serial or parallel combination with a variety of decisionmaking schemes to provide increased performance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.