Patent ID: 8566084

Claim:
A speech signal processing system, comprising: a framing unit configured to divide an input speech signal into frames, wherein a pair of consecutive frames has a frame shift length equal to at least one fundamental period of the input speech signal, and the pair of consecutive frames has an overlap equal to at least a predetermined length; a discrete Fourier transform unit configured to apply a discrete Fourier transform to each of the frames and output a spectrum of the input speech signal; a Cross-Power Spectrum Phase (CSP) coefficient calculation unit configured to calculate a CSP coefficient of the spectrum of each pair of consecutive frames; a phase information obtaining unit configured to receive an output from the CSP coefficient calculation unit, and to search a predetermined search range for a maximum CSP coefficient value for each pair of consecutive frames, so as to obtain an index that maximizes the CSP coefficient value for each pair of consecutive frames; a time-series data generation unit configured to arrange the maximum CSP coefficient values for pairs of consecutive frames in the order in which the frames appear so as to generate time-series data; and a vowel identification unit configured to use the time series data of the maximum CSP values to identify vowel parts of the input speech signal.