Notch.hpp

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#pragma once
 
#include <AH/STL/cmath>
#include <Filters/FIRFilter.hpp>
 
 
template <class T = float>
FIRFilter<3, T> simpleNotchFIR(double f_n) {
    double cos_omega = std::cos(M_PI * f_n);
    double normalize = 2 - 2 * cos_omega;
    return {{
        T(1. / normalize),
        T(-2 * cos_omega / normalize),
        T(1. / normalize),
    }};
}