[sdiy] math question - somewhat OT

[Magnus Danielson]

From: jbv <jbv.silences at club-internet.fr>
Subject: [sdiy] math question - somewhat OT
Date: Tue, 21 Sep 2004 21:55:06 +0200
Message-ID: <41508719.F5D945EE at Club-Internet.fr>

> Hi folks,
> 
> I have a blank.
> I want to represent frequencies (partials of a sound
> for instance) on a linear scale (instead of exponential).
> IOW the distance between the following values :
> 220, 440, 880, 1760 should be equal (but the freqs
> aren't always perfect harmonics values).
> How do I compute that ?

If you want "equal distance" you GOT to do it on a logarithmic scale.
The only thing you do is to mark it by the non-logaritmized values.

So, let's say that 220 Hz is on the 3rd mark, 440 Hz is on the 4th mark and
880 Hz is on the 5th mark, each mark being say 1 cm apart, then you just write
220 Hz on the 3rd mark, 440 Hz on the 4th mark and 880 Hz on the 5th mark.
The scale is logarithmic, but the scale marking isn't. Ain't that confusing?

Now, is that what you are looking for (but maybe not expected)?

If not, describe better what you are after.

Cheers,
Magnus