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class:: HPZ1
summary:: Two point difference filter
related:: Classes/LPZ1, Classes/HPZ2
categories:: UGens>Filters>Linear
Description::
A special case fixed filter. Implements the formula:
code::
out(i) = 0.5 * (in(i) - in(i-1))
::
Which is a two point differentiator.
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;
{ HPZ1.ar(WhiteNoise.ar(0.25)) }.play;
// HPZ1 is useful to detect changes in a signal:
// see also HPZ2
(
{
var changingSignal = LFNoise0.ar(1000);
var hpz1 = HPZ1.ar(changingSignal);
[hpz1, hpz1 > 0, hpz1.abs > 0]
}.plot
);
::
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