Time-frequency analysis of the glottal opening

Wolfgang Wokurek Institut f ur Maschinelle Sprachverarbeitung Universit at Stuttgart, Azenbergstra e 12, 70174 Stuttgart, Germany [email protected] ABSTRACT Simultaneous recordings of the laryngograph signal and speech recorded in an non-reverberating environment are investigated for acoustic evidence of the glottal opening within the microphone signal. It is demonstrated that the high resolution time-frequency analysis of the microphone signal by the smoothed pseudo Wigner distribution (SPWD) shows responses of the vocal tract to both, the glottal closure and the glottal opening. Thus, a convolution-based model for the relation between the laryngograph signal and the microphone signal is evaluated. It turns out, that the microphone signal may be viewed as ltered version of a power function of the laryngograph signal. Hence, such a nonlinear processed laryngograph signal may be an appropriate model for the acoustic excitation of the vocal tract.