[sdiy] Walsh update

[Neil Johnson]

> > Thought I'd drop in on this thread :-)
>
> Why kill a thought provoking topic?

Kill?  On the contrary...

> Somewhere, I have a table of resistor coefficients from Walsh to
> summing opamps to produce f through 10f.

Yeh, on my site there's a table for producing saw, sine, triangle waves,
so just scale the coeffs to resistors and you'd have the same.

Its much trickier to say "changing this Walsh coeff is like changing
sinewaves like this..." because the Walsh-Fourire transform is as complex
as the Walsh transform (ie. sums over the entire range).  Not forgetting
pahse of course (a bit tricky in Walsh-domain, easy in Fourier-domain).

Neil

--
Neil Johnson :: Computer Laboratory :: University of Cambridge ::
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