Method of accommodating for carbon/electret telephone set variab

Details Method of accommodating for carbon/electret telephone set variab Method of accommodating for carbon/electret telephone set variab

1993-11-19

1996-06-18

MacDonald, Allen R.

395 242, G01L 506

Patent

active

055287310

ABSTRACT:
In a speaker verification system, a method of compensating for differences in speech samples obtained during registration and those obtained during verification due to the use of different types of microphones is provided by filtering at least one of the samples such that the similarities of the two samples are increased. The filtered sample is used within the speaker verification matching process. A two-way comparison is disclosed in which both a verification speech sample and a reference sample are filtered with nonlinear microphone characteristics such as carbon microphone characteristics. A four-way comparison is also disclosed in which patterns produced from unfiltered verification and reference samples and patterns produced from the filtered verification and reference samples are compared to identify a match. A score is determined for each comparison. The comparison having the best score is used to determine if a match has occurred.

REFERENCES:
patent: 4631749 (1986-12-01), Rapaich
patent: 5185848 (1993-02-01), Anitsuka et al.
patent: 5201004 (1993-04-01), Fujiwara et al.
patent: 5206913 (1993-04-01), Sims

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