Characteristics of the glottal turbulent noise source

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Abstract
A reflectionless tube technique was used [in human] to obtain direct estimates of turbulent noise produced at the glottis during whispered vowels. The glottal turbulent noise source was previously described theoretically as a series pressure source having a spectrum that is relatively flat for 2 or 3 octave around a center frequency [Stevens, (1971)]. Center frequency was determined primarily by the area of the constriction at which turbulence was produced with the volume velocity of air flowing through the constriction. The present results substantiated this theoretically based description of the glottal turbulent noise source. There was no significant difference between the glottal turbulent noise spectra of male and female speakers. The application of these findings to the synthesis of whispered vowels is discussed.

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