An automatic method to estimate the time-based parameters of the glottal pulseform

A method of automatically extracting the time-based parameters (the fundamental period, the open quotient, the speed quotient, and the closing quotient) of the glottal waveform is presented. The only input that is needed in the analysis is the acoustical speech signal. In the first stage of the method an estimate for the glottal excitation is computed using iterative adaptive inverse filtering (IAIF). The extraction of the time-based parameters is then computed by using both the obtained glottal flow and its derivative. The method was tested with synthetic and natural speech of three different phonation types. The results show that the method gives good estimates for the time-based parameters of the glottal flow except for the analysis of speech that is produced using high fundamental frequency and pressed phonation