Abstract
The volume velocity function of the glottis can be computed from a pitch-synchronous spectral analysis of the speech pressure wave. The method consists of computing the Fourier coefficients of a pitch period, locating the formant frequencies, removing the formant poles from the spectrum, and regenerating the glottal waveform from the residual by Fourier synthesis. To obtain accurate results it is necessary to record the original speech without phase distortion while maintaining at least 55–60 db signal-to-noise ratio. The data reported here were derived from recordings originating with a WE-640-AA condenser microphone in a free-space room feeding a digital tape recorder. Two male speakers uttered six vowel sounds between h and d at different pitches and intensities. The glottal waveforms were examined to determine both shape and phase with respect to the speech wave as a function of the sound, the pitch and the intensity. Sequences of periods were studied for variations from period to period.
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