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Klarinet Archive - Posting 000019.txt from 1999/01

From: David Renaud <studiorenaud@-----.com>
Subj: Re: [kl] re:Intonation training
Date: Sat, 2 Jan 1999 07:08:58 -0500

Very late-- Here's a copy with improved spelling

Edwin V. Lacy wrote: "
I have questioned many of them about precisely
this question, and their answer has always been That the partials *must*
be whole number multiples of the frequency of the fundamental."

This is probably negligible for wind instruments, where we are vibrating a
very free column of air, never less there is always some inertia, even in air,
and
clarinets.

Look up "inharmonicity" in any Piano Technicians manual.
I'll follow up with some titles and page #'s tomorrow.

The basic concept is that partials are only perfect multiples in
a perfect, friction less, world.
The more inertia the higher the "inharmonicity"
The stiffer the material being vibrated the higher the inertia.

Metal string is stiffer and"inharmonicity" is pronounced.
Older strings are more "inharmonic" , the elastic
metal has becomes brittle.
Ask any guitar player, and they will confirm that
very old strings are difficult to tune. The harmonics
don't line up anymore..

I've never seen numbers for a wind instrument, but
believe the deviations are very small. Looking at the
numbers for master test tunings on concert grand pianos,
the deviations can be very large.

Would love to see some numbers for a wind instrument.
Perhaps I'll borrow a reyburn cybertuner and take some
measurements of this. This is a recently developed program
used by some piano technicians, that will listen to over
20 harmonics, plot their relative volumes, and measure
the deviation of each one. Would make a neat little
clarinet project.

David Renaud

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