[sdiy] Additive Synthesis questions

[JH.]

PLL and frequency divider.

JH.


----- Original Message ----- 
From: "Ingo Debus" <igg.debus at t-online.de>
To: "synth diy" <synth-diy at dropmix.xs4all.nl>
Sent: Saturday, April 10, 2010 3:34 PM
Subject: Re: [sdiy] Additive Synthesis questions



Am 08.04.2010 um 20:54 schrieb David G. Dixon:

> The square waves can be generated in harmonic ratios off of a single
> VCO with dividers,

I've read in several postings here that harmonic ratios as required  
in additive synthesis (or created by a vibrating string) can be  
created by frequency division. Or am I misunderstanding?

But, but, but..
It cannot be done that way. For additive synthesis you need  
frequencies f, 2f, 3f, 4f, 5f and so on. With a frequency divider  
you'll get f, f/2, f/3, f/4, f/5...
This is very different. Even if you start with a fairly high master  
frequency, say 60f, you only get f, 2f, ... 6f. 7f doesnt work, you  
would need 420f as a master frequency then.

Am I missing the point?

Ingo
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