HPZ1 two point difference filter


HPZ1.ar(in, mul, add)


A special case fixed filter. Implements the formula:


out(i) = 0.5 * (in(i) - in(i-1))


which is a two point differentiator.

Compare:


{ WhiteNoise.ar(0.25) }.play;


{ HPZ1.ar(WhiteNoise.ar(0.25)) }.play;


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