armBPsvf
Bandpass filter, state-variable type, audiorate modulation inputs (use with complexSH oscillator and armMOD for complex filtering)
Inlets
frac32buffer filter input
frac32buffer pitch
frac32buffer reso
Outlets
frac32buffer filter output
Parameters
frac32.s.map.pitch pitch
frac32.u.map.filterq reso
int32 mode
Declaration
int32_t low;
int32_t band;
int32_t hp;
Init
low = 0;
band = 0;
Audio Rate
int32_t damp = (0x80 << 24) - (__USAT(inlet_reso + param_reso, 27) << 4);
damp = ___SMMUL(damp, damp);
int32_t alpha;
int32_t freq;
MTOFEXTENDED(param_pitch + inlet_pitch, alpha);
SINE2TINTERP(alpha, freq);
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 -
(___SMMUL(band << 1, ___SMMUL(band << 1, band << 1) << 4));
switch (param_mode) {
case 0:
outlet_out = low;
break;
case 1:
outlet_out = band;
break;
case 2:
outlet_out = high;
break;
case 3:
outlet_out = notch;
break;
}
hp += outlet_out - hp >> 9;
outlet_out -= hp;