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Klarinet Archive - Posting 000840.txt from 2000/09

From: Bilwright@-----.net (William Wright)
Subj: Re: [kl] Reed behavior on mouthpiece
Date: Tue, 26 Sep 2000 12:57:47 -0400

If you would like to read Benade's assertions, they are in Chapter
21, "The Woodwinds: 1", section 21.3, of his larger book (Fundamentals
of Musical Acoustics).
Benade used a taragato and an oboe for some of his measurements,
but you'll see citations of results for clarinet as well.

Here's a quote:

"The simple relationship described in statement 1 between the
partials of a tone [my summary: the higher partials increase in
amplitude faster than the lower ones do] is observed only when the
motion of the reed-valve parts themselves is of small enough amplitude
that the variable, pulsating airflow through them is ever entirely shut
off. Once the blowing pressure is raised to the point where the reed
is blown entirely closed for a portion of each cycle of its oscillation,
the player notices a change of feel, the listener notices a change of
tone, and the higher partials tend to grow in a way that parallels [my
summary: at the same rate as] the growth of the fundamental."

Notice that Benade says that the sound wave's amplitude continues
to increase after the reed begins to close completely. Thus full
closure does not (according to Benade) limit the sound's volume.
Elsewhere in section 21.3, Benade talks about pressure, not
continuity of airflow or volume of airflow, as determining the sound's
amplitude.

Cheers,
Bill

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