[sdiy] 2-Channel Frequency shifting

[Carles]

> This is just an idea at the moment.
>
> Has anybody tried a setup with two frequency shifters,
> where a signal is shifted up, then processed by some
> fixed filter, and then shifted down by the same amount
> as it was shifted up?

Hi Jürgen,
At the moment I'm doing a digital frequency shifter on the
Chameleon (www.soundart-hot.com). It's a stereo one, so in
fact all the building blocks except the quadrature oscillator
are duplicated.
The idea you describe is very nice. When my "standard" frequency
shifter works perfectly (it still doesn't, grrr..) I will give
it a try in the digital domain!