Bode Barber Pole Phaser

[Don Tillman]

   Date: Fri, 24 Nov 2000 08:41:22
   From: Scott Gravenhorst <music.maker at gte.net>

   I have not seen nor heard the effect, but the mere name of
   it suggests, to me, a system similar to the Shepard function
   deal for VCOs but replacing the VCOs with phase shifters.

Functionally similiar, but Bode implements it more elegantly.  See the
patent.

   From: WeAreAs1 at aol.com
   Date: Fri, 24 Nov 2000 14:45:22 EST

   The way you make a barber pole phaser is to use the four outputs of
   a quadrature sawtooth LFO to modulate four separate phase shifters.
   That's the simple answer. 

That's one way, but Bode's approach is completely different.  Check
out US patent 4,399,326.

   From: Turner Wallace <Wallace.Turner at tms-ltd.com>
   Date: Mon, 27 Nov 2000 08:46:45 -0000

   Consequently, I am puzzled about the functionality of the barber
   pole phaser. By name a 'shepard tone' equivalent of phasing might
   be expected.  However, there are stories of frequency shifting too.

   Can anyone resolve this?

You can get a copy of the patent here:
http://www.delphion.com/details?&pn=US04399326__

  -- Don

-- 
Don Tillman
Palo Alto, California, USA
don at till.com
http://www.till.com