Patent Document ID: 20020052741
Application ID: 09953905
Patent Flag: 0

Claim One:
1. A voice recognition system, comprising: a voice model generated from voices being collected in advance and containing multiplicative distortions; a noise model generated from additive noise collected in advance; a first estimating section for estimating first estimated values of the multiplicative distortions contained in the voice model; a combined voice model generated on the basis of noise added voices which are obtained by processing to combine the voice model, the first estimated values of the multiplicative distortions, and the additive noise of the noise model; a calculating section for calculating a Jacobian matrix based on the additive noise of the noise model and the noise added voices; a second estimating section for estimating second estimated values of multiplicative distortions contained in utterance voices; a first operating section for obtaining noise variation by processing to combine additive noise produced in a non-utterance period, the additive noise of the noise model, and the second estimated values of the multiplicative distortions estimated by the second estimating section, the first operating section for simultaneously multiplying the noise variation by the Jacobian matrix calculated in the calculating section; an adaptive model generated by processing to combine the results of multiplication obtained by the first operating section and the combined voice model together; and a second operating section for generating an observation value series by processing to combine the utterance voice and the second estimated values of the multiplicative distortions estimated by the second estimating section; wherein voice recognition is carried out by collating the observation value series with the adaptive model.