I could also imagine those more advanced filters just strip/filter the input signal to the base sound frequencies, and re-add vocal chord/tract like harmonics by themselves in a way or another. I’ve sometimes had the impression that certain advanced (commercial) vowel filters could have some fancy method of interresonating or whatever, creating the mentioned “dirt” by themselves, even from very clean signals that would sound very synthetic with a straight filter curve. Real spectral manipulation via an fft in high resolution sounds like not suitable for realtime audio, the latency would be too big.
#Sunvox cant hear free
Spectral stuff? Well I could imaging (not with the sunvox filter, but with the other free vst) that there can be some work done on the input signal before the filter to modulate it automatically into something closer to vocal chords pulses. How was the example posted above here actually generated? In sunvox, with what kind of synth/fx chain? It sounds very natural at least in the beginning. In some examples I’ve seen/heard the result also sounds very “synthetic”, this stuff is dependant on the input signal that’s filtered - if it’s very close the the base sound (and accompanying hiss/noise) the vocal chords produce, such filters sound very close to a real vocal, while very synthetic base sounds will mostly be modulated to a more “robot” type result. I’ve now heard examples of the sunvoc vocal filter, and it sounds like just an usual strong complex iir type filter, applying a frequency response of a vowel to the input sound. Note you can also use a vocoder with good quality, and feed it with loops of vowels, or samples of speech, maybe a granular sweeping synth of a recorded vowel transition is nice material for making vowel sweeps. Like it needs some “dirt” in the spectrum, and have enough harmonics, to have a satisfying effect. The opensource tool “praat” is cool stuff to analyse speech samples!Īlso it is important, that the base sound you’re filtering is suitable to such action. A male with a very dark voice has different response than a women with a high voice, or children. Transposing the formant frequencies in the right way can shift the impression of how the voice is percieved. Also native language makes a big difference. Note every person has his/her own formant response and frequencies.
Also the vocal tract will put dips in the resulting spectrum, like it is blocking certain frequencies, and emulating these will get things even closer. Boosting resonance will make the formants sound more sharp, intense, artificial etc. You can get recognisable results with 2 formants with fixed amplitude, but the closer to the natural thing the filter is, the more like real voice it will sound. Morphing the vowel means moving the frequencies and amplitudes of the formants.
Basically you can extract the “formants” from voice samples (it’s like up to 6-7 different resonators in our vocal tract), or find some table of the formant center frequencies and amplitudes, and put resonating bandpass filters in parallel for each formant’s frequency with the right amplitude. Vowel filters are just filters with the right frequency response mimicking the response of our vocal system.
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