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IIR filter and design functions

iir function

template <typename T, typename E1>
expression_handle<T, 1> iir(E1 &&e1, const zpk<T> &params)

Returns template expressions that applies biquad filter to the input.
Param e1 Input expression
Param params IIR filter in ZPK form
Details This overload converts ZPK to biquad coefficients using to_sos function at every call

iir_bandpass function

template <typename T>
zpk<T>
iir_bandpass(const zpk<T> &filter, identity<T> lowfreq,
             identity<T> highfreq, identity<T> fs = T(2.0))

Calculates zero-pole-gain coefficients for the band-pass IIR filter
Param filter Filter type: chebyshev1, chebyshev2, bessel, butterworth
Param lowfreq Low cutoff frequency (Hz)
Param lowfreq High cutoff frequency (Hz)
Param fs Sampling frequency (Hz)
Returns The resulting zpk filter

iir_bandstop function

template <typename T>
zpk<T>
iir_bandstop(const zpk<T> &filter, identity<T> lowfreq,
             identity<T> highfreq, identity<T> fs = T(2.0))

Calculates zero-pole-gain coefficients for the band-stop IIR filter
Param filter Filter type: chebyshev1, chebyshev2, bessel, butterworth
Param lowfreq Low cutoff frequency (Hz)
Param lowfreq High cutoff frequency (Hz)
Param fs Sampling frequency (Hz)
Returns The resulting zpk filter

iir_highpass function

template <typename T>
zpk<T> iir_highpass(const zpk<T> &filter,
                    identity<T> frequency,
                    identity<T> fs = T(2.0))

Calculates zero-pole-gain coefficients for the high-pass IIR filter
Param filter Filter type: chebyshev1, chebyshev2, bessel, butterworth
Param frequency Cutoff frequency (Hz)
Param fs Sampling frequency (Hz)
Returns The resulting zpk filter

iir_lowpass function

template <typename T>
zpk<T> iir_lowpass(const zpk<T> &filter,
                   identity<T> frequency,
                   identity<T> fs = T(2.0))

Calculates zero-pole-gain coefficients for the low-pass IIR filter
Param filter Filter type: chebyshev1, chebyshev2, bessel, butterworth
Param frequency Cutoff frequency (Hz)
Param fs Sampling frequency (Hz)
Returns The resulting zpk filter

Auto-generated from sources, Revision 6aea976a464de59d522d0c629e64bf0c044e6777, https://github.com/kfrlib/kfr/blob/6aea976a464de59d522d0c629e64bf0c044e6777/include/kfr/