Klarinet Archive - Posting 000480.txt from 2001/01

From: "Dee D. Hays" <deehays@-----.net>
Subj: Re: [kl] Register Key, Twelfth vs. Octave
Date: Mon, 15 Jan 2001 16:44:36 -0500

----- Original Message -----
From: "Sebastien Duguet" <sebastienduguet@-----.com>
Subject: [kl] Register Key, Twelfth vs. Octave

> Hello everyone!
>
> Can anybody give a complete explanation on why the use of the register key
> produces a twelfth and not an octave, as is the case for other wind
> intrument? I need to explain this in the pedagogy class I'm taking.
Thanks
> for any kind of help.

The clarinet acts like a cylindrical pipe *closed* at one end and open on
the other. This means that it is the odd number harmonics that are
available for note production. The 1st harmonic produces the fundamental
note. The third harmonic produces an interval of a 12th above the
fundamental.

By contrast, the flute acts as a cylindrical pipe open on both ends. Thus
both even and odd harmonics are available for note production. The 1st
harmonic produces the fundamental note. The 2nd harmonic produces the
octave. Oboes and saxophones act like conical pipes. For conical pipes,
again both the even and odd harmonics are available.

For more detailed explanations on cylindrical pipes closed on one end,
cylindrical pipes open on both ends, conical pipes, etc. a text on acoustics
would be required.

Dee Hays
Michigan

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