HPZ1 : LPZ1 : Filter : PureUGen : UGen : AbstractFunction : Object

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

// 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

);