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Function butterworth¶

`function` butterworth(int) dsp ¶

zpk butterworth(int N)

Analog Butterworth lowpass filter prototype (normalized cutoff = 1 rad/s).

Returns the zeros, poles, and gain of an Nth-order analog Butterworth lowpass filter. The filter has no zeros and a maximally flat passband magnitude response.Uses a hardcoded table for orders 1-24; returns a gain-only filter for unsupported orders.Compatible with scipy.signal.butter with output='zpk' and analog=True.

Parameters
N	Filter order (must be 0-24). Returns a gain-only filter if N == 0 or N > 24.

Returns
	ZPK representation of the analog lowpass filter prototype.

Fully qualified name: kfr::butterworth(int)

Declared at dsp/iir_design.hpp:131

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