[sdiy] DCO

[Jerry Gray-Eskue]

For those out there that are wondering about this also..

I see why I did not run across a DCO as described by Tom.

I have done some looking on the web and found, listed by most common use.

(1) Digital Controlled Oscillator refers to a Square wave generated by a
programmable divider.
(2) Use of a Programmable Divider to step through a wave table, generating
an arbitrary wave form.
	In the Digisound this takes the form of a Voltage Controlled Digital
Oscillator Module 80-21
(3) Various wave shapers that modify a Square Wave.
(4) The most rare and no full implementations found is as described below.
	Apparently the Prophet 08 is setup this way but I have not been able to
locate the schematics.



-----Original Message-----
From: synth-diy-bounces at dropmix.xs4all.nl
[mailto:synth-diy-bounces at dropmix.xs4all.nl]On Behalf Of Jerry
Gray-Eskue
Sent: Wednesday, December 30, 2009 7:50 AM
To: Tom Wiltshire; Synth-diy at dropmix.xs4all.nl
Subject: [sdiy] DCO




Tom<<There are various reasons; DCOs generate genuine analogue ramps,
which is important to some people; Related is the fact that DCOs can
easily generate sync waveforms without aliasing, which is *hard* to
do with digital oscillators; DCOs have a relatively low processor
overhead, since you only have to deal with a timing reset pulse once
per wavecycle instead of dealing with generating a new sample at x
KHz. That leaves you time to do modulation processing on the same chip.>>

This sounds a lot like a design I have been finishing up.

I had not seen anything similar to my design and am now wondering if I have
reinvented the wheel.
What exactly is a DCO? Are there any schematics / info available on them?
What have they been used in?

- Jerry

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