Another kind of Phasing

[Don Tillman]

   From: Haible Juergen <Juergen.Haible at nbgm.siemens.de>
   Date: Tue, 13 Jan 1998 17:47:27 +0100

   I didn't dare to write "new kind", but it was new to me at least.

This is interesting.  

I think what's happening here is that you've got a new implementation
of a motorized (ie., Shepard tone, barber pole, continuously
ascending) phase shifter.

You know how a classic phase shifter circuit has an LFO-controlled
frequency dependent phase shift network, and we mix that with the
original signal to get our notches?

Well here we have a fixed, frequency dependent phase shift network
(the quadrature filter) immediately followed by the frequency shifter
multipliers (continuously increasing/decreasing phase shift, frequency
independent).  So that's effectively the same as a continuously
changing phase shift network, and then you mix the original signal
back in. 

Very cool!

Is that what it sounds like to you?

  -- Don