The highpass command applies a simple first-order lowpass RC filter to a signal or audio clip.
f:=unapply(periodic(sign(x),x,-1/880,1/880),x); s:=apply(f,soundsec(3)):; playsnd(highpass(createwav(s),5000)) |
Output: the sound of the periodic signal after applying a highpass RC filter with cutoff 5000 Hz.