Patent ID: 8438014

Claim:
A speech processing device comprising: an input unit configured to input a speech signal; a marking unit configured to assign a pitch mark representing a representative point in a fundamental period to the speech signal for each fundamental period; an extractor configured to window a part of the speech signal and extract a partial waveform that is a speech waveform of the windowed part; a calculator configured to perform frequency analysis of the partial waveform to calculate a frequency spectrum; an estimator configured to generate an artificial waveform that is a waveform according to an interval between the pitch marks for each harmonic component having a frequency that is a predetermined multiple of a fundamental frequency of the speech signal and configured to estimate harmonic spectral features representing characteristics of the frequency spectrum of the harmonic component from each of the artificial waveforms; and a separator configured to separate the partial waveform into a periodic component produced from periodic vocal-fold vibration as an acoustic source and an aperiodic component produced from aperiodic acoustic sources other than the vocal-fold vibration by using the respective harmonic spectral features and the frequency spectrum of the partial waveform.