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Klarinet Archive - Posting 000044.txt from 2010/12

From: Martin Marks <>
Subj: Re: [kl] kl] Snake Charmers
Date: Sat, 04 Dec 2010 15:27:26 -0500

This is a very impressive math exercise, however I have several Meyer's rec=
ordings and can't hear the doppler effect. =A0If we can't hear it, who care=
s? =A0I can't hear it on Frost's CD's either. =A0Are you using math to just=
ify your argument against motion?

On Dec 03, 2010, at 01:05 PM, Tim Roberts <> wrote:

"Jim Lytthans" <>
> 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 especial=
ly, =

> 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,
Providenza & Boekelheide, Inc.

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