[sdiy] analogue phase modulation

[Mike]

I rememebr getting involved with complex analogue FM patches quite a long
time ago, right down to building 'scaling' control voltage processors.

One problem we hit at the time was that the whole technique was a good
recipe for 'drift multiplication'. If an oscillator drifted a bit, the
effect on the output was seriously magnified. I clearly remember some
patches that would stay stable for minutes. I christened one patch 'The
Butterfly', after it gave us a great illustration of Lorenz's small changes
effect. Figuring out which oscillator was responsible was fun too. The
remedy at the time was to use CSound, though with an early pentium this was
fun as well, (like overnight compile runs). Interesting times.

||\/||ike
----- Original Message ----- 
From: "John Mahoney" <jmahoney at gate.net>
To: <>
Sent: Thursday, January 11, 2007 12:23 AM
Subject: Re: [sdiy] analogue phase modulation


> At 07:11 PM 1/10/2007, JH. wrote:
> > > What about the whole "through-zero" business? Not important?
> >
> >This _is_ thru zero stuff!
> >
> >When the phase is modulated back faster than it would advance from the
> >carrier frequency, you're approaching negative momentary frequency range!
> >
> >JH.
>
> Oh!
> --
> john
>
>