Klarinet Archive - Posting 000139.txt from 2010/08

From: Jennifer Jones <helen.jennifer@-----.com>
Subj: Re: [kl] About clarinet acoustics
Date: Sun, 15 Aug 2010 15:32:23 -0400

On Sun, Aug 15, 2010 at 9:10 AM, Tony Pay <tony.p@-----.org> wrote:
> On 15 Aug 2010, at 12:35, Diego Casadei wrote:
> Mike also just wrote to me, about my 8cm worry:

[snip]

Mike McIntyre?
>> [You wrote:]

[snip]

>> So Diego's nonzero displacement and velocity at the reed
>> -- while certainly nonzero -- must be very small in comparison
>> to displacement and velocity at a displacement antinode. =A0This
>> in turn implies that the pressure antinode nearest the reed must
>> be correspondingly close to the reed: of course it would move
>> right up to the reed if you bit it completely closed.

The node would expand to fill the whole instrument and the antinode
would decay because biting stops the vibrations and hence, variations
in pressure (standing waves).

>> The only way out I can see is that the textbook "cylindrical bore"
>> is at best an approximation -- especially near the mouthpiece?
>> If the bore cross-section varies along its length, then that
>> shifts the node-antinode pattern, of course, as
---------------
>> with the extreme
>> case of oboes and saxophones. =A0If you tell me how the
>> cross-section varies I could think about this a bit more.

Conically?

-Jennifer
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