biquad_peaking()

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

Second-order peaking coefficients.

Parameters

frequency	Centre frequency in Hz
q	Bandwidth control; higher is narrower
gain_db	Boost (positive) or cut (negative) at centre, in dB
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 128 of file Coefficients.cpp.

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

References a, b, frequency, and q.