[sdiy] math question - somewhat OT

[Toby Paddock]

(I see it's been answered, but since I already wrote this, I'm sending it 
anyway)
I'm probably the last person that should be trying to answer a math question 
but...

If you want the linear scale to be octaves:

For ref_freq being where you want the scale to start.

octaves= ln(frequency/ref_freq)/ln(2)  

I THINK you could change the (2) to (10) for decades.

Someone please correct me if I'm wrong.

Toby

> 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 ?
> 
> Thanks,
> JB
> 
>