Function iir_bandstop¶

`function` iir_bandstop(const zpk &, double, double, double) dsp ¶

zpk iir_bandstop(const zpk& filter, double lowfreq, double highfreq, double fs = 2.0)

Designs a digital bandstop (notch) IIR filter and returns ZPK coefficients.

Applies frequency pre-warping, lowpass-to-bandstop analog transformation, and bilinear transform.

Parameters
filter	Analog lowpass prototype (butterworth, chebyshev1, chebyshev2, bessel, or elliptic).
lowfreq	Lower cutoff frequency in Hz. If fs is omitted (left at its default of 2.0), frequencies are interpreted as normalized to Nyquist, so the valid range is 0..1.
highfreq	Upper cutoff frequency in Hz. See note on lowfreq.
fs	Sampling frequency in Hz (default 2.0, i.e. Nyquist = 1 Hz).

Returns
	Digital bandstop filter in ZPK form.

Fully qualified name: kfr::iir_bandstop(const zpk &, double, double, double)

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