TriPoleFilter.h File Reference

Namespaces
	sst
	Parent namespace for all Surge Synth Team code.
	sst::filters
	DSP code for Surge filters.
	sst::filters::TriPoleFilter
	This filter is an emulation of the "Threeler" VCF by Ian Fritz (https://ijfritz.byethost4.com/Threeler_board_doc.pdf).
	sst::filters::TriPoleFilter::OnePoleLPF
	sst::filters::TriPoleFilter::OnePoleHPF
	sst::filters::TriPoleFilter::OnePoleLPF_FB
	sst::filters::TriPoleFilter::OnePoleHPF_FB
	sst::filters::TriPoleFilter::ResWaveshaper

Macros
#define	F(a)   SIMD_MM(set_ps1)(a)
#define	M(a, b)   SIMD_MM(mul_ps)(a, b)
#define	D(a, b)   SIMD_MM(div_ps)(a, b)
#define	A(a, b)   SIMD_MM(add_ps)(a, b)
#define	S(a, b)   SIMD_MM(sub_ps)(a, b)
#define	N(a)   S(F(0.0f), a)

Enumerations
enum	thr_coeffs {   thr_b0 = 0 , thr_a0 , thr_b1 , thr_a1 ,   thr_b2 , thr_a2 , thr_k , n_thr_coeff }
enum	thr_state {   thr_z0 , thr_x0 , thr_z1 , thr_x1 ,   thr_z2 , thr_x2 , thr_fb , thr_fb1 }

Functions
template<typename TuningProvider >
void	makeCoefficients (FilterCoefficientMaker< TuningProvider > *cm, float freq, float reso, int, float sampleRate, TuningProvider *provider)
template<FilterSubType subtype>
SIMD_M128	process (QuadFilterUnitState *__restrict f, SIMD_M128 in)

Variables
constexpr float	res_gain = 1.5f
constexpr float	in_gain = 4.0f
constexpr float	out_gain = 1.0f / in_gain
constexpr int	nIterGlobal = 3
constexpr int	nIterStage = 1
constexpr float	ota1bp = 0.88f
constexpr float	ota1bn = 1.0f
constexpr float	ota2bp = 0.9f
constexpr float	ota2bn = 0.97f
constexpr float	ota3bp = 0.95f
constexpr float	ota3bn = 1.025f
constexpr float	Iabc = 8.0f
constexpr float	Rload = 220.0f
const auto	res_factor_db = std::log10(Iabc * Rload)
constexpr float	alpha = 1.0168177f
const float	log_alpha = std::log(alpha)
constexpr float	beta = 9.03240196f
const float	beta_exp = beta * log_alpha
constexpr float	c = 0.222161f
constexpr float	bias = 8.2f
constexpr float	max_val = 7.5f
constexpr float	mult = 10.0f
constexpr float	one = 0.99f
constexpr float	oneOverMult = one / mult
const float	betaExpOverMult = beta_exp / mult

Macro Definition Documentation

F

#define F

(

a

)

SIMD_MM(set_ps1)(a)

M

#define M	(		a,
			b
	)		SIMD_MM(mul_ps)(a, b)

D

#define D	(		a,
			b
	)		SIMD_MM(div_ps)(a, b)

A

#define A	(		a,
			b
	)		SIMD_MM(add_ps)(a, b)

S

#define S	(		a,
			b
	)		SIMD_MM(sub_ps)(a, b)

N

#define N

(

a

)

S(F(0.0f), a)