Etude de l’influence du couplage acoustique source-conduit vocal sur F°des voyelles orales

With the aid of a two-mass model of the vocal source loaded by the input impedance of the vocal tract, we first study theoretically, then by simulation, the effects of source-vocal tract coupling on the intrinsic frequencies F0 of the French oral vowels. We explain the correlation which exists between F0 and the frequency of the first formant as well as the results from the experiment described by Ishizaka and Flanagan [1972]. In conclusion, we show that the acoustic coupling cannot explain the different values of F0, intrinsic in the vowels, but on the contrary, a physiological coupling has to compensate for the effects of acoustic coupling to explain the characteristics revealed in natural speech.