Open mouth overtones

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I could ask this direct from Rollin or Wolfgang but maybe somebody else is also interrested.

If we filter overtones in mouth by tonque, we get low overtones from large space and high overtones from small mouth. Makes sense, longer waves fit in large space. But when I filter overtones by opening mouth, I get high overtones by opening my mouth wide open and low by closing it. Understand? What is the physical explanation?

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    David Stuetzel

    kind of video respose ;-)

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    Sauli Heikkilä

    Thanks for responding and specially Daniels video, which did not give answer but great ideas. And no, Jens, I am still looking for it. Formant-theory is good, but I have to try it to get full understanding. Thanks again.

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    Marco Tonini

    Wolfgang Saus said:

    Hi Marco,
    where does this theory with the converse volumes in two-cave-techniques come from? My own investigations show a significant lowering of the 3rd formant when rising the tongue tip to the pallet. Not effect on the first formant.

    Hi Wolfgang, this is part of a more complex phoniatric theory, advocated by Dr. Franco Fussi, Dr. Franco Ferrero (dead, RIP), Dr. Mauro Uberti, me and others. In any case you know the rule: large cavity developes low resonances, small cavity developes high resonances. Teorically the 3rd formant is in relation with lips, the first with mouth opening and oral cavity, the 2nd with oral cavity. So moving the tip of the tongue we change the resonance of F1 and F2; while one increases its peak, the other one decreases its peak. Sorry, I know I wasn't clear enough, I need more time to explain better but you know, my tinnitus doesn't allow my brain to stay awake/reactive for too much time