Patent Document ID: 6151573
Application ID: 09134775
Patent Flag: 1

Claim One:
1. An improved speech recognition system comprising: a speech recognizer; and a source normalization model coupled to said recognizer; said model derived by a method of source normalization training for HMM modeling of speech comprising the steps of: (a) providing an initial model; (b) on said initial model or following new models performing the following steps to get a new model: b.sub.1) estimation of intermediate quantities; b.sub.2) performing re-estimation to determine initial state probability, transition probability, mixture component probability and environment probability; b.sub.3) deriving mean vector and bias vector; b.sub.4) solving jointly for mean vector and bias vector using linear equations and determining variances and transformation; b.sub.5) replacing old model parameters for the calculated ones; and (c) determining after a new model is formed if it differs significantly from the previous model and if so repeating steps b.sub.1 -b.sub.5.