Systems and methods for access filtering employing relaxed recog

Details Systems and methods for access filtering employing relaxed recog Systems and methods for access filtering employing relaxed recog

1998-02-11

2000-08-22

Zimmerman, Brian

Communications: electrical

Continuously variable indicating

With meter reading

34082534, 704246, 704250, 704273, 704245, 382115, 382116, 382117, 382118, G06F 704

Patent

active

061079359

ABSTRACT:
A speaker recognition system for selectively permitting access by a requesting speaker to one of a service and facility include an acoustic front-end for computing at least one feature vector from a speech utterance provided by the requesting speaker; a speaker dependent codebook store for pre-storing sets of acoustic features, in the form of codebooks, respectively corresponding to a pool of previously enrolled speakers; a speaker identifier/verifier module operatively coupled to the acoustic front-end, wherein: the speaker identifier/verifier module identifies, from identifying indicia provided by the requesting speaker, a previously enrolled speaker as a claimed speaker; further, the speaker identifier/verifier module associates, with the claimed speaker, first and second groups of previously enrolled speakers, the first group being defined as speakers whose codebooks are respectively acoustically similar to the claimed speaker (i.e., cohort set) and the second group being defined as speakers whose codebooks are acoustically similar to the claimed speaker but not as acoustically similar as the codebooks of the speakers in the first group (i.e., legion set); and still further, the speaker identifier/verifier module verifies the requesting speaker by comparing the at least one feature vector of the requesting speaker to the codebooks of the previously enrolled speakers in the second group and, in response to such comparison, generates an indicator indicating that the requesting speaker is one of verified and not verified for access to one of the service and facility.

REFERENCES:
patent: 5510777 (1996-04-01), Pilc et al.
patent: 5897606 (1999-04-01), Kanevsky et al.

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