[sdiy] VCO Linear FM input - DC or AC coupled?

Mattias Rickardsson mr at analogue.org
Mon Jun 26 20:49:11 CEST 2023


On Mon, 26 Jun 2023 at 20:39, ben gebhardt via Synth-diy <
synth-diy at synth-diy.org> wrote:

> Isn't this just the difference between phase modulation and frequency
> modulation?
>

No, there's a derivative involved.
Frequency is the derivative of phase. Hence,
PM with a signal is the same thing as FM with the derivative of the signal.

Having AC coupling on linear FM inputs is because any DC component will
bend the pitch away. Ideally I guess you want low enough DC-cutoff to leave
your modulating signal waveforms untouched, but fast enough to get rid of
DC components introduced while patching around... or something like that.
:-)

/mr
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