Speech analysis method and device for supplying data to synthesize speech with diminished spectral distortion at the time of pitch change

Abstract

A method for speech analysis applicable to a speech analysis/synthesis system employed for producing a synthetic speech. Voiced and unvoiced segments of input speech signals X(n) are discriminated. An amplitude information A(ω) and a phase information P X (ω) are extracted from the voiced segments of the input speech signals. A pitch period is detected from the voiced segments of the input speech signals. A pulse train S(n) as a sound source information is generated so that its period corresponds on the time scale to the detected pitch period of the input speech signals. A phase information P S (ω) is extracted from the pulse train S(n). A difference P(ω) between the phase information P S (ω) of the pulse train S(n) and the phase information P X (ω) of the input speech signal is found and is supplied as the phase information of the desired one-pitch period within the input speech signals.