Klarinet Archive - Posting 001067.txt from 2000/03

From: Don Longacre <nw2v@-----.com>
Subj: [kl] Re: Reeds mode of Vibration
Date: Fri, 31 Mar 2000 22:14:13 -0500

Jonathan Cohler <cohler@-----.net> writes:
>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:

Yes, yes, you are quite right. I should have elaborated on increased
amplitude and cutoff time. Sometimes radio frequency wave mechanics creep
into my generalities on sound-in-air acoustics. In rf,cut off of amplitude
modulated wave forms or "flat-topping" generate harmonic content for the
same reason but it is an undesirable attribute in radio, creating out-of-band
harmonics which are a no-no, not to mention power loss in the fundamental
frequency. This has been an interesting thread and your input has been
highly appreciated. I think it can be said that this topic is one whereby
the physics of sound and artistry merge.

Best wishes,

Don Longacre

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