[sdiy] jitter in oscillators for music purposes

[Magnus Danielson]

From: "Colin f" <colin at colinfraser.com>
Subject: RE: [sdiy] jitter in oscillators for music purposes
Date: Mon, 12 Jul 2004 17:37:22 +0100
Message-ID: <000901c4682e$81b120f0$152ca8c0 at ZEN>

> 
> > > Now, as Magnus said, the voltage noise on the comparator input
> > > certainly leads to frequency modulation. Even if it is white,
> > > the laws of small frequency modulation will shape the spectrum
> > > accordingly. So we only need to compute the total noise
> > > voltage at this point, following traditional methods.
> > 
> > I prefer to use phase modulation, since that is also what 
> > really happends.
> > This is also supperiour in most analysis forms. 
> 
> ...and presumably amplitude modulation too, of a fixed amount per oscillator
> cycle. As with the frequency/phase modulation the amount is only altered at
> the instant of reset when the noise at the comparator input is 'sampled'.

You are correct, the phase modulation and the amplitude modulation will occur
with the same signal.

Cheers,
Magnus