Vowels OSC artifacts

[sovietpop]

Really like the vowels OSC but when using values above 95 i get
lots of artifacts, is this normal ?

[pichenettes]

Yes

Iirc it’s emulating slightly unvoiced sounds by randomly reseting the phase of the sound. That’s how SAM did it anyway!

[sovietpop]

Ok thanks for the quick answer !
I have found something about the vowels OSC in the forum:

Shruthi-Synthesizer and my "WAVE 1"

I found a bug in RenderVowel code from shruthi. // Interpolate formant amplitudes. for (uint8_t i = 0; i < 4; ++i) { uint8_t amplitude_a = ResourcesManager::Lookup<uint8_t, uint8_t>( wav_res_vowel_data, offset_1 + 3 + i); uint8_t amplitude_b = ResourcesManager::Lookup<uint8_t, uint8_t>( wav_res_vowel_data, offset_2 + 3 + i); data_.vw.formant_amplitude[i] = U8U4MixU8( amplitude_a, amplitude_b, balance); } False: “for (uint8_t i = 0; i < 4; ++i) {” Right: “for (uint8_t i = 0; i < 3;…

Looks like someone made a modification for the Shruthi, maybe i can patch the Ambika software.

[rolfdegen]

Hallo sovietpop…

I also had disturbances in the sound and I changed the code in my DE-GENERATOR.

Shruthi Code:
phase.integral += phase_increment_.integral;
int16_t phase_noise = int8_t(Random::state_msb()) *
int8_t(data_.vw.noise_modulation);
if ((phase.integral + phase_noise) < phase_increment_.integral) {
data_.vw.formant_phase[0] = 0;
data_.vw.formant_phase[1] = 0;
data_.vw.formant_phase[2] = 0;
}

Shruthi Vowels: https://soundcloud.com/rolf-degen/shruthi-vowels

DE-GENERATOR code:
phase_integral += phase_increment_integral;

		if (phase_integral < phase_increment_integral) {
			Osc.vw1_formant_phase[0] = 0;
			Osc.vw1_formant_phase[1] = 0;
			Osc.vw1_formant_phase[2] = 0;
		}

DE-GENERATOR vowels: https://soundcloud.com/rolf-degen/degenerator-vowels

[sovietpop]

rolfdegen
Thanks i will try that

[Bjarne]

For what it’s worth I added an alternative vowel oscillator without the phase noise to YAM.
Cheers

[sovietpop]

Awesome thanks !!