Returns the median of the last length input points. This non-linear filter is good at reducing impulse noise from a signal.
| length |
Number of input points in which to find the median. Must be an odd number from 1 to 31. If |
| in |
The input signal. |
| mul |
Output will be multiplied by this value. |
| add |
This value will be added to the output. |
// a signal with impulse noise.{ Saw.ar(500, 0.1) + Dust2.ar(100, 0.9) }.play;// after applying median filter{ Median.ar(3, Saw.ar(500, 0.1) + Dust2.ar(100, 0.9)) }.play;// The median length can be increased for longer duration noise.// a signal with longer impulse noise.{ Saw.ar(500, 0.1) + LPZ1.ar(Dust2.ar(100, 0.9)) }.play;// length 3 doesn't help here because the impulses are 2 samples long.{ Median.ar(3, Saw.ar(500, 0.1) + LPZ1.ar(Dust2.ar(100, 0.9))) }.play;// length 5 does better{ Median.ar(5, Saw.ar(500, 0.1) + LPZ1.ar(Dust2.ar(100, 0.9))) }.play;// long Median filters begin chopping off the peaks of the waveform({ x = SinOsc.ar(1000, 0, 0.2); [x, Median.ar(31, x)]}.play;)// another noise reduction application:Synth.play({ WhiteNoise.ar(0.1) + SinOsc.ar(800,0,0.1) });// use Median filter for high frequency noiseSynth.play({ Median.ar(31, WhiteNoise.ar(0.1) + SinOsc.ar(800,0,0.1)) });(// use LeakDC for low frequency noiseSynth.play({ LeakDC.ar(Median.ar(31, WhiteNoise.ar(0.1) + SinOsc.ar(800,0,0.1)), 0.9)});)