[sdiy] frequency shifter

[ColinMuirDorward]

Thanks everyone!
Has anyone seen this implemented in a digital FX unit?
Here <https://www.fullbucket.de/music/freqshifter.html>is a vst I'm looking
forward to trying out.
Richie, I agree, the terminology confused me. I might have preferred to
call it a frequenc*ies* shifter. Well, that's +1 for skipping english and
going straight to the maths. Yesterday I started trying to re-learn my
highschool pre-calc, so Dave's original explanation, which I see now tells
the entire story, is starting to look a little more penetrable.
-Colin

On Sat, Mar 14, 2020 at 8:55 AM Gordonjcp <gordonjcp at gjcp.net> wrote:

> On Wed, Mar 11, 2020 at 09:58:36PM -0700, David G Dixon wrote:
> > Also, the phase displacement network is not protected material.  It is
> well known.  That’s why there is a nice piece of software on the web for
> designing them (QuadNet from Tonne Software: www.tonnesoftware.com <
> http://www.tonnesoftware.com/>  ).  Also, there is a very good writeup of
> the whole Bode frequency shifter concept in Electronotes, although I’m not
> sure if it’s in the “public-domain” part of Electronotes or the part you
> have to buy from Bernie.  I had a complete collection of Electronotes for a
> while, and read all about it.  I chose not to use most of the suggested
> circuitry, but the concepts and ideas were all there.
> >
>
> If you want to see how to use a dome filter and some ring modulators to
> make a frquency shifter, any 1970s-1980s RSGB handbook will give you a fine
> set of circuit diagrams for a phasing-type SSB exciter.
>
> --
> Gordonjcp
>
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