Re: [stella] TIA Audio Polynomials

Subject: Re: [stella] TIA Audio Polynomials
From: Adam Wozniak <adam@xxxxxxxxxxxxxxxx>
Date: Wed, 19 Nov 2003 13:57:44 -0800 (PST)
On Wed, 19 Nov 2003, Eckhard Stolberg wrote:
> Isn't C=15 the same as C=7, except that it operates at
> CPUclock/114 instead of TIAclock/114? And I think C=7
> uses the same LSFR as C=9. But the output is somehow
> combined with a bit that is alternating at the same
> speed. I think this is what the "div 2" means that's
> listed in the table in the Stella programmer's guide.

C=9 is listed as "5 bit poly"
C=7 is "5 bit poly / 2"
C=15 is "5 bit poly / 6"

I don't believe it is a straight frequency division however, or I'd have
recognized the output for C=15 as being the same as C=9.  The tool I wrote
to pick out the patterns is frequency independant.  I haven't looked at
C=7 yet.

I'm away from my home today; I'll look more tomorrow or this weekend.

Will code for food.
"The dinosaurs are not around today because they did not have a space program."
  -- Arthur C. Clarke

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