[sdiy] A different approach to frequency shifting?

[Magnus Danielson]

From: Thomas Hudson <thomas_hudson at mac.com>
Subject: [sdiy] A different approach to frequency shifting?
Date: Thu, 24 Apr 2003 12:28:30 -0700

Hi Thomas,

> I came across an article in CSound Magazine from Summer 2000 about an
> approach to frequency shifting I hadn't seen before. It uses a quadrature
> oscillator and two multipliers followed by two LP filters and then another
> quadrature oscillator and pair of multipliers. The difference in frequency
> between the two oscillators determines the shift:
> 
> http://www.csounds.com/ezine/summer2000/processing/index.html
> 
> It seems that this method would be simplest for thru-zero effects. The
> article is in the context of a digital implementation, but has anyone used
> this technique in the analog world?

Interesting article. Good reference in the end. Many thanks!

There exist yeat another form of frequency shifter, look at the Bode FS at my
site (under Moog). It is to some degree similar to this one, but still had the
dome-filter. This beat-frequency shares the dual oscillator setup that this
one has.

Cheers,
Magnus