lphp1
1st order lowpass filter and high pass filter. Based on scale and square discretization (better HP filter).
Inlets
frac32buffer input
frac32.bipolar pitch
Outlets
frac32buffer output
frac32buffer hp
Parameters
frac32.s.map.pitch pitch
Declaration
int32_t lp;
Init
lp = 0;
Control Rate
// krate
uint32_t F;
MTOFEXTENDED(param_pitch + inlet_pitch, F);
int32_t a = (1 << 30) - (F >> (2 + 4));
for (int i = 0; i < 6; i++) {
a = ___SMMUL(a, a) << 2;
}
a = (1 << 30) - a;
Audio Rate
outlet_lp = lp = ___SMMLA(a, inlet_in - lp, lp >> 2) << 2;
outlet_hp = inlet_in - lp;