Abstract
Linear predictive coding analysis (LPC) has been advanced as a technique for constructing an inverse filter which recovers the glottal airflow wave from the acoustic speech wave [D. Y. Wong, J. D. Markel, and A. H. Gray, Jr., IEEE Trans. Acoust. Speech Signal Process. ASSP‐27, 350–355 (1979); M. G. Berouti, D. G. Childers, and A. Paige, IEEE ICASSP, 33–36 (1977)]. Because of the problem of interaction of LPC analysis with the glottal source, the LPC analysis interval is restricted to the closed glottis interval. This requirement is a problem in analyzing breathy and falsetto voice in males and all voice types in females. A model reference technique has been developed which constructs the inverse filter from information contained in an entire pitch period. The technique computes the inverse filter by performing a joint optimization of a model of the glottal pulse together with the inverse filter coefficients. A striking comparison is obtained between the model reference technique and LPC applied to female voice and falsetto male voice. [Work supported by NIH.]
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