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
Fax. +44 207 542 2699
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Reuters Messaging. david.salter.reuters.com@...

-----Original Message-----
From: Florian Anwander [mailto: Florian.Anwander@... ]
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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