DATE: Tue, 30 Nov 1993 08:06:17 CDT From: Robert Johnston Subject: glottal vibrato
>Sometimes it seems to me like my throat vibrato is tending to >actually stop the air flow for a miniscule time, as well as >staggering the amount of air going through the harp. This also >produces some little extraneous throat noises through my JT-30. >Can the glottis do the latter without any total momentary "shut off"? >Is the guy who observed his glottis by sticking a TV camera down >his nose out there to address this?
Indead Hank Bahnson did observe exacctly that. The Glottis opens and closes with the vibrato. But remember that the sub-glotal system ie. lungs wind pipe etc. are also an acoustic resonator. So as the glottis opens and closes the influence of this resonant system on the troat resonance also varies with the vibrato. This means that the overall vocal tract resonance is being modulated by the vibrato and therfore so is the playing pitch.
