Patent ID: 6208958
Filing Date: 2001-03-27
Classification: G10L

Abstract:
A pitch determination apparatus using spectro-temporal autocorrelation, comprising:a formant bandwidth extension unit for extending a formant bandwidth to reduce the influence of a first formant with respect to an input voice;a temporal autocorrelation calculation unit for calculating an autocorrelation value of a time axial voice within a candidate pitch range with respect to a time axial speech signal output from the formant bandwidth extension unit;a spectral autocorrelation calculation unit for transforming the time axial speech signal output from the formant bandwidth extension unit into a frequency axial signal, and calculating an autocorrelation value between frequency axis amplitude spectrums within the candidate pitch range;an autocorrelation value synthesis unit for summing the autocorrelation values obtained by the temporal and spectral autocorrelation calculation units and obtaining a spectro-temporal autocorrelation value; anda pitch determination unit for determining a pitch having a maximum spectro-temporal autocorrelation value as a final pitch.