Doepfer

Florian,
 
that's a good point, sine wave are always derived from a triangle.
 
I'll have to get hold of a copy of your book (even though I can't read
German).
 
It sounds interesting.
 
Rgds
 
David
 
 

David Salter 
Reuters Ltd 
UKI Project Management 
Tel. +44 207 542 2402 
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	-----Original Message-----
	From: Florian Anwander [mailto:Florian.Anwander@consol.de] 
	Sent: 25 June 2004 10:15
	To: Doepfer_a100@yahoogroups.com
	Subject: Re: [Spam] Re:[Doepfer_a100] Re: Audio Samples: My VCO
	
	
	David Salter wrote:
	
	> Florian,
	>  
	> My understanding (peter correct me if I'm wrong) is that any
VCO design
	> uses a primary oscillator (core) whose output will be a
waveform
	> (Triangle or sawtooth for example) and any other types of
waveform are
	> constructed from this primary waveform using waveshaping
circuits,
	> rectifiers etc.
	Ok, Then "core" is what I thought about it:
	>>       The basic waveform the bare VCO is producing (as the
Curtis
	>> CEM3340 does
	>>       triangle, the moogish  VCOs like the A110 does saw)?
	
	
	> It seems that whatever waveform you start with will impart a
timbral
	> characteristic on the other waveforms.
	>  
	> This is quite odd when you think about it as a sine wave is a
sine wave,
	> a waveshape that produces the fundamental with no harmonics.
	>  
	> However no waveshaper is perfect and that's why if you look at
two sine
	> waves from different VCO's on a scope (with enough resolution)
they are
	> never perfect just close. It's the imperfections that alter
the sound
	> characteristic.
	If a sine is produced via a waveshaper, it always is based on a 
	triangle. In some oscillators the triangle is the core-waveform,
in 
	others (most) cases the triangle is derived from the core saw.
	
	In my book there are two drawings, which show the output of an
FM'ed VCO 
	on the different Waveform-outs. Drawing one shows the output you
would 
	expect if the FM would be the core-waveform of the VCO; drawing
two 
	shows the real output, that is produced by an core-saw VCO
followed by 
	waveform converters. I don't remember the page at the moment.
	
	Florian
	
	
	
	
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