Akso - Audio DSP Platform

kick drum

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Consistent kick drum object

Author: Sputnki

License: BSD

Github: sptnk/edrum/kick drum.axo

Inlets

bool32.rising trigger

frac32 pitch modulation

Outlets

frac32buffer audio output

Parameters

frac32.u.map amplitude decay

frac32.u.map pitch envelope decay

frac32.u.map pitch envelope amount

frac32.s.map.pitch basic tuning

frac32.u.map.gain amount of click at the beginning of the kick

Declaration

int32_t envcounter = 0;
int32_t pitchenvcounter = 0;

int32_t k_decay;
int32_t k_pitchdecay;
int32_t k_pitchenv;
int32_t k_basepitch;

int32_t pitch;
int32_t phasor = 0;
int32_t r;

bool ttrig = 0;

Control Rate

k_decay = ((8500000 - (param_decay >> 4)));
k_pitchdecay = ((8500000 - (param_pitchdecay >> 4)));
k_pitchenv = (param_pitchenvamt << 4);
MTOF(param_basepitch + inlet_pitch, k_basepitch);

if (inlet_t && !ttrig) {
  envcounter = (1 << 27);
  pitchenvcounter = (1 << 27);
  phasor = param_click >> 1;
  ttrig = 1;
} else if (!inlet_t)
  ttrig = 0;

Audio Rate

envcounter = ___SMMLS(envcounter, k_decay, envcounter);
pitchenvcounter = ___SMMLS(pitchenvcounter, k_pitchdecay, pitchenvcounter);

SINE2TINTERP(phasor, r);
r = ___SMMUL(r, envcounter);

pitch = ___SMMLA(pitchenvcounter, k_pitchenv, k_basepitch);
phasor += pitch;
outlet_out = r;

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