VOICE RECOGNITION METHOD, ITS DEVICE AND PROGRAM AND ITS RECORDING MEDIUM

摘要

PROBLEM TO BE SOLVED: To precisely detect a voice interval and to make it to be hardly affected by environmental noise. SOLUTION: A power spectrum of input signals is computed (31) and average power of a noise interval is obtained (32). Based on the average power, noise is greatly suppressed for the power spectrum (34) and a voice/noise interval is detected from the suppressed power spectrum (35). Using the average power, noise is suppressed at a lower level for the power spectrum (42), a model of noise that has not been suppressed is constructed using the noise interval within the lowly suppressed power spectrum (36) and the noise model is synthesized into a clean voice model (38). A recognition process (17) is conducted for the voice interval in the lowly suppressed power spectrum employing the synthesized model. COPYRIGHT: (C)2006,JPO&NCIPI