A 2-STAGE PROCEDURE FOR PHONE BASED SPEAKER VERIFICATION

A two-stage procedure for text prompted speaker verification is presen ted. In this procedure, speech recognition (segmentation) and speaker verification are carried out separately. In the first stage, Hidden Ma rkov Models are used for identifying phone segments; in the second sta ge, phoneme dependent Radial Basis Function networks are used for veri fying the claimed speaker identity. Phone modelling is important, beca use different phonemes characterise different aspects of a speaker. It is found here that phone modelling makes it easier to reject impostor s, because successful impostors are usually only successful for specif ic phonemes. (C) 1997 Elsevier Science B.V.