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add ring modulation capabilities

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This commit is contained in:
Chris
2024-10-01 08:42:20 +02:00
parent 4dbf88afcb
commit 9b3e4deb30
1 changed files with 57 additions and 26 deletions
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83
synth/tx_voice.h
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@@ -8,8 +8,9 @@
namespace trnr { namespace trnr {
enum mod_dest { enum mod_dest {
out = 0, mod_dest_out = 0,
fm, mod_dest_fm,
mod_dest_am
}; };
template <typename t_sample> template <typename t_sample>
@@ -28,8 +29,8 @@ public:
float velocity = 1.f; float velocity = 1.f;
float additional_pitch_mod = 0.f; // modulates pitch in frequency float additional_pitch_mod = 0.f; // modulates pitch in frequency
mod_dest op3_dest; mod_dest op2_dest = mod_dest_fm;
mod_dest op2_dest; mod_dest op3_dest = mod_dest_fm;
float pitch_env_amt; float pitch_env_amt;
float feedback_amt; float feedback_amt;
@@ -62,24 +63,14 @@ public:
float pitch_env_signal = pitch_env.process_sample(gate, trigger) * pitch_env_amt; float pitch_env_signal = pitch_env.process_sample(gate, trigger) * pitch_env_amt;
float pitched_freq = frequency + pitch_env_signal; float pitched_freq = frequency + pitch_env_signal;
float op3_signal = process_op3(pitched_freq); float signal = process_operators(pitched_freq);
float op2_pm = op3_dest == fm ? op3_signal : 0.f;
float op2_signal = process_op2(pitched_freq, op2_pm);
float op1_pm = op2_dest == fm ? op2_signal : 0.f;
float op1_signal = process_op1(pitched_freq, op1_pm);
float signal_mix = op1_signal;
if (op3_dest == out) { signal_mix += op3_signal; }
if (op2_dest == out) { signal_mix += op2_signal; }
// reset trigger // reset trigger
trigger = false; trigger = false;
redux(signal_mix, bit_resolution); redux(signal, bit_resolution);
_outputs[0][s] += signal_mix / 3.; _outputs[0][s] += signal / 3.;
_outputs[1][s] = _outputs[0][s]; _outputs[1][s] = _outputs[0][s];
} }
} }
@@ -113,25 +104,65 @@ private:
float process_op3(const float frequency) float process_op3(const float frequency)
{ {
float fb_freq = frequency * op3.ratio; float fb_freq = frequency * op3.ratio;
float fb_mod_index = (feedback_amt * MOD_INDEX_COEFF); float fb_mod_index = feedback_amt * MOD_INDEX_COEFF;
float fb_signal = feedback_osc.process_sample(trigger, fb_freq) * fb_mod_index; float fb_signal = feedback_osc.process_sample(trigger, fb_freq) * fb_mod_index;
float op3_Freq = frequency * op3.ratio; float op3_Freq = frequency * op3.ratio;
float op3_mod_index = (op3.amplitude * MOD_INDEX_COEFF); return op3.process_sample(gate, trigger, op3_Freq, velocity, fb_signal) * op3.amplitude;
return op3.process_sample(gate, trigger, op3_Freq, velocity, fb_signal) * op3_mod_index;
} }
float process_op2(const float frequency, const float phase_mod = 0.f) float process_op2(const float frequency, const float modulator)
{ {
float op2_freq = frequency * op2.ratio; // if patched, op3 modulates the phase of op2
float op2_mod_index = (op2.amplitude * MOD_INDEX_COEFF); float pm = op3_dest == mod_dest_fm ? modulator : 0.f;
return op2.process_sample(gate, trigger, op2_freq, velocity, phase_mod) * op2_mod_index;
float adjusted_freq = frequency * op2.ratio;
float signal = op2.process_sample(gate, trigger, adjusted_freq, velocity, pm * MOD_INDEX_COEFF) * op2.amplitude;
// if patched, op3 modulated the amplitude of op2
if (op3_dest == mod_dest_am) ring_mod(signal, modulator, op3.amplitude);
return signal;
} }
float process_op1(const float frequency, const float phase_mod = 0.f) float process_op1(const float frequency, const float modulator)
{ {
// if patched, op2 modulates the phase of op1
float pm = op2_dest == mod_dest_fm ? modulator : 0.f;
float op1_freq = frequency * op1.ratio; float op1_freq = frequency * op1.ratio;
return op1.process_sample(gate, trigger, op1_freq, velocity, phase_mod) * op1.amplitude; float signal = op1.process_sample(gate, trigger, op1_freq, velocity, pm * MOD_INDEX_COEFF) * op1.amplitude;
// if patched, op2 modulates the amplitude of op1
if (op2_dest == mod_dest_am) ring_mod(signal, modulator, op2.amplitude);
return signal;
}
float process_operators(float frequency)
{
float op3_signal = process_op3(frequency);
float op2_signal = process_op2(frequency, op3_signal);
float op1_signal = process_op1(frequency, op2_signal);
float signal_mix = op1_signal;
if (op3_dest == mod_dest_out) { signal_mix += op3_signal; }
if (op2_dest == mod_dest_out) { signal_mix += op2_signal; }
return signal_mix;
}
void ring_mod(float& carrier, float modulator, float blend)
{
float dry_lvl = 1.f - blend;
float wet_lvl = blend;
float dry_signal = carrier;
float wet_signal = carrier * modulator * 1.5f;
carrier = dry_lvl * dry_signal + wet_lvl * wet_signal;
} }
float redux(float& value, float resolution) float redux(float& value, float resolution)