softquant
A "soft" quantizer with a filter to smoothly morph between unquantized (original) and quantized signal. The filter LP-filter dampens the offset that is created by the quantizer in comparison with the original signal.
Inlets
frac32buffer i1
frac32 quant
frac32 damp
Outlets
frac32buffer o1
Parameters
frac32.u.map Turn up quant to quantize the signal. Note that "damp" should be opened at least a bit to have quantizing effect
frac32.s.map.pitch Damps the quantizing. When fully damped, original signal will come. Note though, that the quantizing could generate a DC-offset
bool32.tgl sets the filter mode: OFF=normal 6dB filter without resonance, ON=SVF with resonanc
frac32.u.map.filterq filter resonance amount when mode is ON.
int32_t LP;
int32_t prv;
int i;
int32_t low;
int32_t band;
int32_t notch;
int32_t high;
int32_t SVF(int32_t IN) {
band -= ___SMMUL(___SMMUL(band << 2, band << 2), band << 2);
notch = IN - (___SMMUL(res, band) << 1);
low = low + (___SMMUL(freq, band) << 1);
high = notch - low;
band = (___SMMUL(freq, high) << 1) + band;
}
int32_t freq;
int32_t res;int32_t quant = param_quant + inlet_quant;
quant = quant & ((1 << 28) - 1);
quant = quant > (1 << 27) ? (1 << 28) - quant : quant;
quant = ___SMMUL(quant << 3, quant << 2) + 1;
int32_t dmp;
if (param_mode == 0) {
MTOF(param_damp + inlet_damp, dmp)
} else {
res = (0x80 << 24) - (param_res << 4);
res = ___SMMUL(res, res);
int32_t alpha;
MTOFEXTENDED(param_damp + inlet_damp, alpha);
SINE2TINTERP(alpha, freq);
}int32_t diff = inlet_i1 - prv;
int32_t out;
for (i = 0; i < 2; i++) {
int32_t i1 = prv + diff * i;
int32_t o1 = i1 / quant * quant;
int32_t d1 = i1 - o1;
if (param_mode == 0) {
LP = ___SMMLA((d1 - LP) << 1, dmp, LP);
out = o1 + (d1 - LP);
} else {
SVF(d1);
out = o1 + high;
}
}
outlet_o1 = out;
prv = inlet_i1;