[hatari-devel] YM2149 Anti-Alias Filter

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Hi Nicolas,

Here is an anti-alias filter for the YM2149.

This piecewise selective filter works by filtering the falling
edge of a sampled pulse-wave differently from the rising edge.

Piecewise selective filtering is effective because harmonics on
one part of a wave partially define harmonics on other portions.

Piecewise selective filtering can efficiently reduce aliasing
with minimal harmonic removal.

I disclose this information into the public domain so that it
cannot be patented. May 23 2012 David Savinkoff.


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