Patent ID: 6377924
Filing Date: 2002-04-23
Classification: G10L

Abstract:
A method of enrolling phone based speaker specific commands in a speech recognition system comprising the steps of:(a) providing an initial set of speaker-independent phone-based Hidden Markov Models H, and a grammar(G); (a1) receiving a first speech utterance U1 and a second speech utterance U2 from an enrollment speaker; (b) adjusting mean vectors of said initial set of speaker-independent phone-based Hidden Markov Models to suit the enrollment microphone and speaker characteristics and using the mean adjusted vectors of said set of speaker-independent phone-based Hidden Markov Models and phone loop grammar to produce a segmentation of the utterance U1; (c) generating a Hidden Markov Model Hâ€² for each phone segment based on the length of each phone segment and setting the variance of each state to the square root of the utterance U1; and (d) re-estimating the mean vectors of the set of phones models using utterances U1 and U2 to provide a new model set Hâ€² for speech recognition.