Doppler puzzle

[John Delmore]

No dice, Amy, you can't use this dimensionless ratio in the Doppler
equation.  You have to have a frequency.  It DOESN'T matter what pitch
(frequency) you measure.  The problem comes when you try to use a
logarithmic scale (cents) in a linear equation (Hz in Doppler).
JD
  _____  

From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Amy Zilk
Sent: Wednesday, June 21, 2006 5:46 PM
To: Pianotech List
Subject: Re: Doppler puzzle
 
Try dividing any two frequencies that differ by 10 cents.  It's a constant.
Ten cents difference anywhere in the spectrum is a constant frequency ratio
of ~1.0579.  The doppler shift is found in terms of this ratio and you can
convert the 10 cents difference into the ratio of frequencies.  It's
counterintuitive for me (but not for Mark), that it doesn't matter which
pitch you are measuring but that's the way it works.
az
 
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