Name
Bandreject -- RBJ band-reject biquad IIR filter
Synopsis
bandreject frequency[k] width[h|k|o|q]
Function
Apply a two-pole Butterworth band-reject filter with central frequency frequency, and (3dB-point) band-width width. The filter rolls off at 6dB per octave (20dB per decade).

See also sinc for a bandpass filter with steeper shoulders.

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