[sdiy] PRN Noise Gennie Question

[Don Tillman]

   > Date: Mon, 28 Mar 2005 16:58:00 -0800
   > From: James Patchell <patchell at cox.net>
   > 
   > http://www.oldcrows.net/~patchell/synthmodulesII/200-1021.pdf
   > 
   > In the above schematic, I use a 32 bit PRN source, and tap off 8 bits to 
   > run to a DAC...on this application, I did it this way so I could use the 
   > DAC output got generate control voltages in predictable sized steps....

Jim,

Um, it's no longer white noise then, right?  Running the shift
register outputs to the DAC effectively creates a digital filter, so
the result is filtered white noise.  In this case a single pulse
through the shift register will show up as an exponentially decaying
impulse response.

I have not done the math so I don't know what the effect of this
filtering is.  (Anybody?)

But...  I'll bet there's a way to use this to your advantage and make
pink noise very easily with selected taps off the shift register.

  -- Don

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