How to call this measure. (Pawel Kusmierek )

Subject: How to call this measure.
From:    Pawel Kusmierek  <pq(at)NENCKI.GOV.PL>
Date:    Fri, 9 Aug 2002 14:08:30 +0200

Dear list,

I had to compare spectra produced by three different loudspeakers.  I
played white noise through the speakers, recorded the outpput to
computer and made 1/3 octave spectra.

In order to compare them quantitatively, I calculated a measure which
decribes whether the spectrum goes monotonically up from lowest band
to a maximum and then down to the highest band, or it wanders up and
down (has troughs and peaks).  Now I do not know how to call the
measure.  My best idea so far is 'spectrum irregularity'. Can anyone
suggest a good name?

Here is desription how it is calculated (from the manuscript):
Moreover, [NAME] measure of the spectra was calculated as the mean of
the absolute differences between neighbouring 1/3-octave bands.  This
measure was then normalised by dividing by the sum of ascending and
descending vertical (sound pressure level) ranges of the spectra.  The
ranges were computed by subtracting the value in the first band and
the value in the last band, respectively, from the spectrum maximum.


Best regards,

Pawel
=================================

Pawel Kusmierek
Department of Neurophysiology
Nencki Institute of Experimental Biology
3, Pasteur St., 02-093 Warsaw, Poland

tel. (48-22) 659 85 71 ex 379
fax  (48-22) 822 53 42
E-mail: pq(at)nencki.gov.pl
or: kusmierek(at)yahoo.com, pq(at)poczta.gazeta.pl
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