HPZ2 : LPZ2 : Filter : PureUGen : UGen : AbstractFunction : Object

out(i) = 0.25 * (in(i) - (2 * in(i - 1)) + in(i - 2)).

// 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

);