DISPERSION CORRECTION PARAMETER ESTIMATION DEVICE, VOICE RECOGNITION SYSTEM, DISPERSION CORRECTION PARAMETER ESTIMATION METHOD, VOICE RECOGNITION METHOD AND PROGRAM

摘要

PROBLEM TO BE SOLVED: To provide a dispersion correction parameter estimation device that stably and accurately estimates a dispersion correction parameter through discriminative learning.;SOLUTION: A dispersion correction parameter estimation device executes the steps of: generating a dispersion correction parameter; using the dispersion correction parameter to correct a dispersion parameter of a Gauss distribution included in a mixed Gauss distribution model; obtaining a degree of difference from a correct answer symbol series with a predetermined particle size, with respect to each opposing candidate symbol series to be obtained through voice recognition of a feature quantity of voice data for learning, on the basis of an acoustic model including the corrected dispersion parameter; obtaining a differential value when using the Gauss distribution dispersion correction parameter to differentiate an objective function of a discriminative learning criterion, on the basis of a language probability of the opposing candidate symbol series, an acoustic score to be obtained by an acoustic model on the basis of the feature quantity of voice data for learning and the opposing candidate symbol series and the degree of difference; and updating the Gauss distribution dispersion correction parameter by changing the Gauss distribution correction parameter according to the differential value.;COPYRIGHT: (C)2013,JPO&INPIT