dis lphp1
Dissymetric 1st order filter type = 0: rate switched on output sign (à la Salino) type = 1: rate switched on rising/decaying (à la Ralond) Used with a square wave input it models waveshapers found in early string machines.
Inlets
frac32 cutoff
frac32 cutoff
frac32buffer input
Outlets
frac32buffer low pass
frac32buffer high pass
Parameters
frac32.s.map bias
frac32.u.map freqUp
frac32.u.map freqDown
frac32.u.map type
int32_t y, ratef, ratef2;y = ratef = ratef2 = 0;int32_t rateUp, rateDown;
MTOF(param_freqUp + inlet_freqUp, rateUp);
MTOF(param_freqDown + inlet_freqDown, rateDown);
int32_t bias = param_bias >> 6;int32_t ref = ___SMMLA(inlet_in, param_type, bias) << 5;
outlet_lp = y =
___SMMLA((inlet_in - y) << 2, ((y < ref) ? rateUp : rateDown), y);
outlet_hp = (inlet_in - y) >> 1;