EUROSPEECH 2003 - INTERSPEECH 2003
We present a new method for estimating the vocal-tract area functions from speech signals. First, we point out and correct a long-standing sign error in some literature related to the derivation of the acoustic reflection coefficients of the vocal tract from a speech signal. Next, to eliminate the influence of the glottal wave on the estimation of the vocal-tract filter, we estimate the vocal-tract filter and the derivative of the glottal wave simultaneously from a speech signal. From the vocal-tract filter obtained, we derive the vocal-tract area function. Our improvements to existing methods can be seen from the vocal-tract area functions obtained for vowel sounds /(textscripta)/ and /i/, each produced by a female and a male subject. They are comparable with those obtained using the magnetic resonance imaging method. The derivatives of the glottal waves for these sounds are also presented, and they show very detailed structures.
Bibliographic reference. Deng, Huiqun / Beddoes, Michael / Ward, Rabab / Hodgson, Murray (2003): "Estimating the vocal-tract area function and the derivative of the glottal wave from a speech signal", In EUROSPEECH-2003, 2437-2440.