biquad_allpass()

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

Second-order allpass coefficients.

Unity magnitude at all frequencies with frequency-dependent phase shift. Useful for phase manipulation and dispersion without spectral change.

Parameters

frequency	Centre of phase transition in Hz
q	Sharpness of the phase transition
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 119 of file Coefficients.cpp.

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

References a, b, frequency, and q.