Name
Highpass -- high-pass filter: Single pole or RBJ biquad IIR
Synopsis
highpass [-1|-2] frequency[k] [width[q|o|h|k]]
Function
Apply a high-pass filter with 3dB point frequency. The filter can be either single-pole (with -1), or double-pole (the default, or with -2). Width applies only to double-pole filters; the default is Q = 0.707 and gives a Butterworth response. The filter rolls off at 6dB per pole per octave (20dB per pole per decade).

See also sinc for filters with a steeper roll-off.

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