Doepfer

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?