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class:: HPZ2
summary:: Two zero fixed midcut.
related:: Classes/BPZ2, Classes/BRZ2, Classes/LPZ2, Classes/HPZ1
categories:: UGens>Filters>Linear
Description::
A special case fixed filter. Implements the formula:
code::
out(i) = 0.25 * (in(i) - (2 * in(i - 1)) + in(i - 2)).
::
classmethods::
method::ar, kr
argument::in
The input signal.
argument::mul
Output will be multiplied by this value.
argument::add
This value will be added to the output.
Examples::
code::
// Compare:
{ WhiteNoise.ar(0.25) }.play;
{ HPZ2.ar(WhiteNoise.ar(0.25)) }.play;
// HPZ2 is useful to detect changes in a signal:
// see also HPZ1
(
{
var changingSignal = LFNoise0.ar(1000);
var hpz2 = HPZ2.ar(changingSignal);
[hpz2, hpz2 > 0]
}.plot
);
::
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