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now it should hopefully work with the new math

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This commit is contained in:
Dimas Leenman 2022-07-24 12:16:39 +02:00
parent 612660852a
commit 8bb075e23e
1 changed files with 11 additions and 12 deletions
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23
src/dsp/node_formant.rs
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@ -69,29 +69,26 @@ impl DspNode for Formant {
let decay_freq = denorm::Formant::dcy(decay_freq, frame);
// where the two decays meet
let carrier_center = decay_freq / (attack_freq + decay_freq);
let carrier_center = attack_freq / (attack_freq + decay_freq);
// where they meet in amplitude
let carrier_lowest_amplitude =
(-std::f32::consts::TAU * base_freq * carrier_center * decay_freq).exp();
(-(std::f32::consts::PI * carrier_center * decay_freq) / base_freq).exp();
// turn it into a triangle wave
let carrier_attack = (1.0 - self.phase) / carrier_center;
let carrier_decay = self.phase / (1.0 - carrier_center);
// actual triangle wave
let carrier_base = 1.0 - carrier_attack.min(carrier_decay);
// make a triangle wave, with the peak at carrier center
let carrier_base =
(self.phase / carrier_center).min((1.0 - self.phase) / (1.0 - carrier_center));
// smoothstep
let carrier =
carrier_base * carrier_base * (3.0 - 2.0 * carrier_base) * carrier_lowest_amplitude
+ (1.0 - carrier_lowest_amplitude);
let carrier = 1.0
- ((1.0 - carrier_lowest_amplitude)
* (carrier_base * carrier_base * (3.0 - 2.0 * carrier_base)));
// multiple of the frequency the modulators are at
let multiple = formant_freq / base_freq;
// round them to the closest integer of the formant freq
let freq_a = multiple.floor();
let freq_a = multiple.floor().max(1.0);
let freq_b = freq_a + 1.0;
// and how much to lerp between them
@ -106,6 +103,8 @@ impl DspNode for Formant {
// increment phase (very imporant)
self.phase += base_freq * self.inv_sample_rate;
// wrap around
self.phase = self.phase.fract();
out.write(frame, wave);