class a
"Class A" distortion. Class A refers to an amplifier topology, with asymetrical overdrive properties. This object adds variable DC offset, a subtle highpass filter can be useful before further processing.
Inlets
frac32buffer input
Outlets
frac32buffer output
Parameters
frac32.u.map overdrivel level
Declaration
int32_t prev = 0;
int32_t prev2 = 0;
int32_t prev_in = 0;
Control Rate
int i;
int32_t drive_complement = (1 << 27) - param_drive;
int32_t drive_complement_square = ___SMMUL(drive_complement, drive_complement)
<< 2;
drive_complement = drive_complement >> 1;
for (i = 0; i < BUFSIZE; i++) {
int32_t mul1 = ___SMMUL((inlet_in[i] + prev_in), prev + prev2);
int32_t biased1 =
__SSAT(___SMMLA(param_drive << 4, mul1 + 0x00800000 + drive_complement,
drive_complement_square),
26)
<< 5;
prev2 = prev;
prev = biased1;
outlet_out[i] = mul1;
prev_in = inlet_in[i];
}