Klarinet Archive - Posting 001030.txt from 2000/03

From: Jonathan Cohler <cohler@-----.net>
Subj: Re: [kl] Re: Reeds mode of Vibration
Date: Fri, 31 Mar 2000 10:02:29 -0500

Don,

What you said is not correct in general. It is true that at the point
where the reed BEGINS to touch the mouthpiece (i.e. the "mf" that I
described), then it only stays on the mouthpiece for a brief part of the
cycle. As the reed vibration amplitude increases, i.e. as one gets louder
than the "mf" point, it stays on the mouthpiece for a longer and longer
portion of the cycle, and the top of the wave is "cut off" more and more
(this is what generates the high frequency response). The longer this "cut
off" flat portion of the curve is, the brighter and louder the sound is.

---------------------
Jonathan Cohler
cohler@-----.net

At 8:45 AM -0500 3/31/0, Don Longacre wrote:
>Which was exactly the quote from Benade's work that I was about to contribute
>but Tony beat me to it. We must keep in mind too, that the reed at the top
>of its amplitude closing the mouthpiece window is virtually instantaneous in
>time. Its rebound is inherent in the potential energy and quality of A. donax
>fashioned as a reed valve. If we could envision a sine wave drawn finely
>enough and draw a line tangential to the peak amplitude and parallel to the
>zero axis we could graphically see how brief the moment of contact is. Much
>like the same sine wave passing through zero to the opposite side. I think
>many critics of reed closure with the mouthpiece envisioned the reed slamming
>shut on the rails with a significant airflow real time cutoff and were
>therefore
>uneasy with Benade's emperical observations.
>
>Don Longacre
>
>
>
>
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