[sdiy] Buchla 295 10-band comb filter topology

[Matthew Arthur]

Phase modulation is applied to an existing signal, fm is done during the
generation of a signal. Although the math can appear identical on paper,
The implementations work differently


You can actually hear phase modulation if it is fast enough, because;

 as the rate of change of the phase is increased, the  frequency shift of
the input signal increases proportionally.

 With a fast enough phase modulation it becomes an audible frequency shift



On Fri, Nov 25, 2022, 9:02 PM David G Dixon via Synth-diy <
synth-diy at synth-diy.org> wrote:

> I've struggled with this idea of "phase modulation" -- I don't really get
> it.
>
> It seems to me that all you are doing is moving the waveform left and right
> in time, within the span of one or two wavelengths.  I don't know how to do
> that, but I suspect that it wouldn't sound like much unless it was done
> "against" another waveform which isn't being phase-modulated.
>
> Also, since one has to slightly speed up or slow down a waveform in order
> to
> move it left or right, even if just a little, it seems to me that phase
> modulation would always involve a very slight change in pitch.
>
> Hence, phase modulation is really just frequency modulation with a very
> constrained range of motion.
>
> Is any of that correct?  If not, then I'd very much appreciate an
> explanation of phase modulation -- specifically, what the hell is it?
>
> Thanks
>
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