Just remembered, the Buchla 285 balanced modulator does this. Any
others

--- In Doepfer_a100@yahoogroups.com , "shm1400" <shm14@h...> wrote:
> By the way, I forgot to mention that my example below requires a
DC
> coupled ring modulator, so it will not work with the A114, though
it
> works with a PAIA 9710. It might also work with the Doepfer A-133
> Polarizer, though I don't have this module yet and haven't tried
> it. If anybody has a 133 one and feels like trying the patch,
> please let me know if it works.
>
> --- In Doepfer_a100@yahoogroups.com , "shm1400" <shm14@h...> wrote:
> > The recent poll on the Nord Modular style clocked random
generator
> > got me thinking about the Nord Modular's ring modulator. It has
> an
> > additional control that varies the modulation from ring to AM to
> > none, which can also be "voltage" controlled. This is extremely
> > useful and I don't know of an analog ring modulator that does
this
> > out of the box.
> >
> > I have been trying to do something similar using existing
> modules.
> > It is my understanding that ring modulation differs from AM in
> that
> > the carrier is inverted when the modulator is negative. Also, in
> the
> > Nord, when the control is zeroed and there is no modulation, it
> > simply passes the carrier unaltered.
> >
> > So, to model the nord's ring modulator, I have started by adding
> an
> > offset to the modulator so that it is all positive (or, better,
> > negative), then attenuating the signal with a VCA (this
> attenuation
> > is the "ring to am to nothing" control) then adding another
offset
> > to make the modulator AC again when the VCA is full open, and
> > sending that signal to the ring modulator's modulator input.
> >
> > Is this correct Does anybody have an easier way of
accomplishing
> > this same end Does anybody know of an analog ring modulator
that
> > does this without outboard stuff Hey, could this be an idea
for
> a
> > new module