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15.2.9  Low-pass filtering: lowpass

The lowpass command applies a simple first-order lowpass RC filter to an audio clip.


Example.
Input:

f:=unapply(periodic(sign(x),x,-1/880,1/880),x);
s:=apply(f,soundsec(3)):;
playsnd(lowpass(createwav(s),1000))

Output:
The sound of the periodic signal after a simple first-order lowpass RC filter has been applied.


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