digiana
digital LQ remake of a comparing amplifier/filter. module compares incoming audio with the filtered signal and adds/subtracts a digital value to/from the filtered signal input depending on whether the incoming audio signal is higher/lower then the filtered signal. saturate/volume control the clipping and volume of the signal rate controls the frequency of the lowpass filters.
Inlets
frac32buffer i1
Outlets
frac32buffer o1
Parameters
frac32.u.map saturate
frac32.u.map volume
frac32.s.map.pitch rate
Declaration
int32_t out;
int32_t val1;
int32_t val2;
int32_t val3;
int32_t val4;
int32_t in[4];
int32_t prev;
int32_t diff;
Control Rate
int32_t freq;
MTOFEXTENDED(param_rate, freq)
Audio Rate
// diff=(inlet_i1-prev)>>2;
in[0] = prev + ((inlet_i1 - prev) >> 2);
in[1] = prev + ((inlet_i1 - prev) >> 1);
in[2] = prev + (inlet_i1 - prev) * 3 / 4;
in[3] = inlet_i1;
out = (in[0] >> 2) > ___SMMUL(val1 << 3, (1 << 27) - param_saturate << 2)
? (param_volume)
: -(param_volume);
val1 = ___SMMLA((out - val1) << 1, freq, val1);
out = (in[1] >> 2) > ___SMMUL(val1 << 3, (1 << 27) - param_saturate << 2)
? (param_volume)
: -(param_volume);
val1 = ___SMMLA((out - val1) << 1, freq, val1);
out = (in[2] >> 2) > ___SMMUL(val1 << 3, (1 << 27) - param_saturate << 2)
? (param_volume)
: -(param_volume);
val1 = ___SMMLA((out - val1) << 1, freq, val1);
out = (in[3] >> 2) > ___SMMUL(val1 << 3, (1 << 27) - param_saturate << 2)
? (param_volume)
: -(param_volume);
val1 = ___SMMLA((out - val1) << 1, freq, val1);
val2 = ___SMMLA((val1 - val2) << 1, freq, val2);
outlet_o1 = val2;
prev = inlet_i1;