Klarinet Archive - Posting 000072.txt from 1999/01

From: David Renaud <studiorenaud@-----.com>
Subj: Re: [kl] re:Intonation training
Date: Sun, 3 Jan 1999 20:57:25 -0500

Edwin V. Lacy wrote:

> I believe it is accurate to say that acousticians who question
> whether it is possible to have inharmonic partials in a wind instrument
> readily acknowledge the phenomenon in the piano.
>

My original comments were a result of thinking on
someone's phrase "Tuning a piano out of tune". and explaining such
in terms of inharmonisity, which produces difficulties
tuning clarinet to piano.

As I said, the effect is probably negligible for clarinets,
thus discrepancies between clarinet and piano.
Neverless the cause for piano is inertia,
of this I am absolutely sure,
leaves me with questions for clarinet.

Edwin V. Lacy wrote:
However, this is due to the physics of the string itself. When the
vibrating medium is an air column, those physical principles would not
apply.

Inharmonisity is not unique to the piano, just pronounced.
Inertia is a property of nature, not just pianos.
>From reading these posts, there is obviously more to
consider, and other factors may override for wind
instruments.

There is some inertia in everything even air, and vibrating
clarinets, barrels, reeds, etc....so...........

QUESTIONS
Do acousticians believe this to have an immeasurable
effect on wind instruments, that it is so negligible??

If it is measurable---& clarinets do have
individual desities, and inertia, which appear to
effect their individual timbres (harmonic content).

Then clarinets with more or less inertia, more or less density,
should encourage in their corresponding timbers, more or
less distortion to their harmonics. Notes using more
or less tube, producing, more or less back pressure,
and air density, should show variations in the harmonic
content also.
Undercutting, probably reduces inertia to certain vibrations
at that point, giving space, effecting air pressure,
leaving the sound structure less distorted??

Just trying different classes of instruments, R13-
Prestige, etc., their density and corresponding harmonic
focus vary. Density does seem to effect
- hamonics--tone--intonation?-- something is going on.

Undercutting, probably reduces inertia to certain vibrations
at that point, providing some space, reducing air pressure,
leaving the sound structure less distorted??

I accept that the effects of inertia are probably negligible,
for wind instruments, and there are overriding factors
but I have problems with the concept,
that something so fundamental in nature, that has a profound
effect on a whole class of instruments, has absolutely no bearing,
on wind instruments, and is impossible.

David Renaud

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