biquad_lowpass()

MAYAFLUX_API void MayaFlux::Kinesis::Discrete::biquad_lowpass	(	double	frequency,
		double	q,
		double	sample_rate,
		std::vector< double > &	a,
		std::vector< double > &	b
	)

Second-order lowpass coefficients.

Parameters

frequency	Cutoff in Hz, clamped to (0, sample_rate/2)
q	Quality factor; 0.7071 is maximally flat
sample_rate	Sampling rate in Hz
a	Denominator output, resized to 3, a[0] == 1.0
b	Numerator output, resized to 3

Definition at line 81 of file Coefficients.cpp.

{
    const auto t = terms(frequency, q, sample_rate);
    const double k = (1.0 - t.cosw0) * 0.5;
    emit(a, b,
        1.0 + t.alpha, -2.0 * t.cosw0, 1.0 - t.alpha,
        k, 1.0 - t.cosw0, k);
}

References a, b, frequency, k, and q.