Klarinet Archive - Posting 000033.txt from 2010/12

From: Tim Roberts <timr@-----.com>
Subj: [kl] kl] Snake Charmers
Date: Fri, 03 Dec 2010 13:05:10 -0500

"Jim Lytthans" <lytthans@-----.net>
> I've been reading the many, many comments on moving clarinetists. My real
> issue with over-done movement with wind players is the Doppler effect. I can
> hear this moving train pitch shift on recordings of clarinetists especially,
> and also with flutists and oboists.

My initial reaction was to scoff at this. Intuitively, it seemed
impossible that a clarinetist could generate enough speed to Doppler
shift the pitch to a detectable degree. Being an engineer, I decided to
run the numbers.

I read that a frequency difference of 0.3% is detectable by the human
ear. Running that through the Doppler equations, it would require a
velocity of 0.5 meters per second to generate that difference.

So, I no longer scoff. It's quite possible for an over-enthusiastic
player to move their bell at a rate higher than 0.5m/s.

--
Tim Roberts, timr@-----.com
Providenza & Boekelheide, Inc.

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