VOCAL TRACT SPECTRUM EXTRACTION DEVICE, VOCAL TRACT SPECTRUM EXTRACTION METHOD AND PROGRAM

摘要

PROBLEM TO BE SOLVED: To extract an accurate vocal tract spectrum that receives no impacts of subglottal impedance from a speech signal.;SOLUTION: A vocal tract spectrum extraction device comprises: a speech section detection part 11; a fundamental frequency analysis part 12; a first LPC analysis part 13 for using window length based on a fundamental frequency to cut out a speech signal, applying an LPC analysis to the cut-out speech signal and obtaining an LPC residual signal; a pitch mark analysis part 14 for using both a pitch waveform generated according to a period of the fundamental frequency and the LPC residual signal to extract a pitch mark time group; a phase equalization speech generation part 15 for generating a phase equalization speech signal by applying a phase equalization filter, which is obtained by using the pitch mark time group and the LPC residual signal, to the speech signal; a first glottal closure section estimation part 16 for estimating a glottal closure section with setting the pitch mark time group as a starting point; a slope characteristic correction part 17 for obtaining a primary difference of the phase equalization speech signal; and a glottal closure section LPC analysis part 18 for applying the LPC analysis in the glottal closure section to the primary difference of the phase equalization speech signal and obtaining an LPC coefficient to minimize the LPC residual signal.;COPYRIGHT: (C)2013,JPO&INPIT