lp m a
2-pole resonant low-pass filter (biquad) Act inlet turns code on/off. This saves a few percentage of DSP.
Inlets
bool32 act
frac32buffer filter input
frac32 pitch
frac32 filter resonance
Outlets
frac32buffer filter output
Parameters
frac32.s.map.pitch pitch
frac32.u.map.filterq reso
Declaration
biquad_state bs;
biquad_coefficients bc;
Init
biquad_clearstate(&bs);
Control Rate
if (inlet_act) {
int32_t freq;
MTOF(param_pitch + inlet_pitch, freq);
biquad_lp_coefs(&bc, freq,
INT_MAX - (__USAT(inlet_reso + param_reso, 27) << 4));
biquad_dsp(&bs, &bc, inlet_in, outlet_out);
}