[sdiy] oscillator jitter / phase noise

[jbv]

Scott Gravenhorst a *crit :

> jbv <jbv.silences at club-internet.fr> wrote:
> >>
> >>
> >> This would then lead to very interesting phasing pattern,
> >> if two or more oscillators beat against each other.
> >> Obviously a quartz stabilised oscilator, DCO or software
> >> oscillator will not have this feature.
> >
> >this feature (phase noise/jitter) is very easy to implement
> >in a DCO or software oscillator, by simply adding the
> >output value of a random LFO to the phase accumulator...
> >of course, each oscillator needs its own random LFO...
>
> I would wonder, however, whether this would accurately (or
> accurately enough) simulate the conditions of an analog VCO.
>  As was pointed out, there are many factors which contribute
> to a VCO's non perfect nature.
>

Yep...
So why not add another random LFO to control frequency jitter,
and (why not) another random LFO to slightly modify the shape
of the waveform ?

What other parameters could be modified ?

JB