Verification Process

Verification.  During a verification process, an individual makes a claim of identity (i.e. typically by saying or entering some kind of user ID) and then they are prompted to submit a speech sample. A temporary voiceprint is made from the speech sample and is then compared to the stored reference voiceprint for the individual.

Pre-Processing and Feature Extraction.  As with the enrollment process, the verification sample is evaluated with a number of audio quality tests. Once these tests have passed, features are extracted.

Comparison.  A temporary template (or voice print) is created. This temporary voice print is then compared to both the reference voice print for the user and "generic" voice print information from universal or cohort models. A score is derived for how closely the temporary print matches the reference voice print PLUS the relative score of the temporary print to the universal or cohort models. This dual scoring system provides greater matching accuracy.

Thresholds and Scoring.  The VMM-1™ engine is fully tunable and can operate at any desired confidence level. For instance, a client may wish to have a 99% match confidence for a particular group of users. So, VBG will configure the engine with the appropriate threshold for a 99% match confidence. As long as the score meets or exceeds this threshold value, a "pass" result is returned. Otherwise, a "fail" result is returned.