Akso - Audio DSP Platform

multimode svf m

$\text{[math]}$

multimode filter, state-variable type, modulation inputs

Author: Johannes Taelman

License: BSD

Github: filter/multimode svf m.axo

Inlets

frac32 pitch

frac32 resonance

frac32buffer filter input

Outlets

frac32buffer highpass filter output

frac32buffer bandpass filter output

frac32buffer lowpass filter output

Parameters

frac32.s.map.pitch pitch

frac32.u.map.filterq reso

Declaration

int32_t low;
int32_t band;

Init

low = 0;
band = 0;

Control Rate

int32_t damp = (0x80 << 24) - (__USAT(inlet_reso + param_reso, 27) << 4);
damp = ___SMMUL(damp, damp);
int32_t alpha;
int32_t freq;
int32_t pitch = __SSAT(param_pitch + inlet_pitch, 28);
MTOFEXTENDED(pitch, alpha);
SINE2TINTERP(alpha, freq);

Audio Rate

int32_t in1 = inlet_in;
int32_t notch = inlet_in - (___SMMUL(damp, band) << 1);
low = low + (___SMMUL(freq, band) << 1);
int32_t high = notch - low;
band = (___SMMUL(freq, high) << 1) + band; // - drive*band*band*band;
outlet_lp = low;
outlet_hp = high;
outlet_bp = band;

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