Klarinet Archive - Posting 000138.txt from 2009/09
From: "Peter Gentry" <peter.gentry@-----.uk>
Subj: RE: [kl] Acoustics of glissandi
Date: Mon, 28 Sep 2009 14:19:00 -0400
Dan
I believe vocal tract refers to the whole space from the lungs to the
mouthpiece within which there are several surfaces/organs capable of
vibration/resonance. I think the interference spoken of is coming from the
epiglottis area rather than the larynx and is associated with a general
loosening of the throat muscles as well as the embouchure. In an extreme
manifestation it would be agin to gargling.
Unfocussed because the sound spectrum is constantly changing either randomly
or "unmusically".
In extreme cases this makes a very unpleasant experience for the performer
as well as the listener.
I must add that this is all speculative on my part - the reference contains
direct measurements not conjecture.
Personally I have never managed to achieve a decent glissando. Since good
sound and intonation usually involves a firm embouchure there is little
scope to raise the pitch lowering just involves relaxation. That's OK for
bending a single note but not very easy to turn into a downward glissando.
I guess like circular breathing it will remain a closed book for me.
regards
Peter Gentry
-----Original Message-----
From: Dan Leeson [mailto:dnleeson@-----.net]
Sent: 28 September 2009 06:08
To: klarinet@-----.org
Subject: Re: [kl] Acoustics of glissandi
Peter that is fascinating. But can you tell me what you mean when you say
"vocal tract"? Do you mean the vocal chords or is it some other part of the
noise making box in the throat?
Dan Leeson
----- Original Message -----
From: "Peter Gentry" <peter.gentry@-----.uk>
To: <klarinet@-----.org>
Sent: Monday, September 28, 2009 9:24 AM
Subject: RE: [kl] Acoustics of glissandi
> Very interesting paper cited there. It needs a lot of study. However I
> posit
> that unfocussed sound is that obtained when the vocal tract starts to add
> a
> forcing frequency a bit like humming and whistling at the same time. Its
> only a suggestion though and comes with a health warning. It's also rather
> destructive on the vocal tract to over indulge in this.
>
> regards
> Peter Gentry
>
>
> -----Original Message-----
> From: Tony Pay [mailto:tony.pay@-----.com] On Behalf Of Tony Pay
> Sent: 28 September 2009 04:21
> To: klarinet@-----.org
> Subject: [kl] Acoustics of glissandi
>
> Any of the scientists here have a comment on:
>
> http://test.woodwind.org/clarinet/BBoard/read.html?f=1&i=311471&t=311426
>
> ?
>
> Tony
> --
> _________ Tony Pay
> |ony:-) 79 Southmoor Rd
> | |ay Oxford OX2 6RE
> tel/fax 01865 553339
> mobile +44(0)7790 532980 tony.p@-----.org
>
>
>
>
>
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