A two-stage procedure for phone based speaker verification

Abstract A two-stage procedure for text prompted speaker verification is presented. In this procedure, speech recognition (segmentation) and speaker verification are carried out separately. In the first stage, Hidden Markov Models are used for identifying phone segments; in the second stage, phoneme dependent Radial Basis Function networks are used for verifying the claimed speaker identity. Phone modelling is important, because different phonemes characterise different aspects of a speaker. It is found here that phone modelling makes it easier to reject impostors, because successful impostors are usually only successful for specific phonemes.

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