AN AMPLITUDE WARPING APPROACH TO INTRA-SPEAKER NORMALIZATION FOR SPEECH RECOGNITION

摘要

Disclosed is an amplitude warping approach to intra-speaker normalization for speech recognition, which applies a recognition model suited for user's voice to a speaker recognition applied product and applies a speaker adaptive method to recognition device in order to improve recognition rate and reliance of the speaker recognition applied product by achieving amplitude normalization according to pitch alteration utterance through intra-speaker warping factor estimation for intra-speaker. Due to acoustic difference of a speaker occurred according to voiceprint and vocal tract, feature space of speech being not transformed from intra-speaker pitch alteration utterance is variously distributed. In order to prevent various distribution of feature space of speaker, reverse rate between input and reference pitches of speaker is applied to determine amplitude warping factor. Amplitude slope on total frequency axis is determined while adjusting height of triangle filter and amplitude.