AUDIO SIGNAL ANALYSIS METHOD, VOICE RECOGNITION METHODS USING SAME, THEIR DEVICES, PROGRAM, AND RECORDING MEDIUM THEREOF

摘要

PROBLEM TO BE SOLVED: To correct influences of multiplication distortion and addition distortion, on the basis of noise or the like. SOLUTION: An audio signal analysis method comprises dividing a voice signal into a plurality of band signals by a filtering bank 11; finding non-periodic component powers (13, 14 and 15A) and periodic component powers (15F and 16) of each band signal; converting the periodic component and non-periodic component powers into discrete cosines (17P and 17A); and vector-coupling these discrete cosine coefficients (18). The audio signal analysis method comprises finding at least a partial dispersion value (or standard deviation) in an hour and/or a vector element of a characteristic parameter obtained above, dividing (normalizing) the corresponding element of a coupling vector by the dispersion value (22b) and correcting the influence of the multiplication distortions and the addition distortions. COPYRIGHT: (C)2006,JPO&NCIPI