[sdiy] How DCOs work

[David G Dixon]

It seems to me (and, bear in mind that I know nothing about DCOs) that one
could use a standard VCO circuit to control the current to an integrator,
and use a digital circuit for the reset.  In this way, the only "tracking
error" would be a slight loss of amplitude at high frequencies, and FM would
still distort the slope.
 
What am I missing?


  _____  

From: Synth-diy [mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of
Adam Inglis
Sent: Tuesday, October 11, 2016 5:15 PM
To: synth-diy DIY
Subject: Re: [sdiy] How DCOs work




On 11 Oct 2016, at 12:52 AM, Colin f <colin at colinfraser.com> wrote:

straight ramp for every cycle, where a VCO would have a convex or concave
ramp shape dependent on the direction of pitch modulation.


This is really interesting. I'd never thought about it like that - so
frequency modulation distorts the waveform in a VCO but not in a DCO. 
What is the audible difference?


(I just know someone is going to use the c- word -- character!)

AI


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