The vocal vibrate primarily because of the Bernoulli effect and the over pressure of the lungs.
Just vibrations alone, called the voice sources, carries almost none of the information that we use in speech. That information arises as the pressure wave goes up through the larynx tube and into the mouth (or up the nose in the case of nasals). It is possible to measure just the voice source by means of a laryngograph.
It seems there are several services already called "Vocafy" - plus one called "Vocalfy" - so you may want to reconsider the current name if you want this to become popular.
I've been working on a project to implement a vocal synthesizer in C. Specifically, based on Dr. Jordi Bonada's PhD thesis "Voice Processing and Synthesis by Performance Sampling and Spectral Models". In part of that paper, he discussed his "Wide-Band Voice Pulse Modeling" algorithm. In this post, I've presented a few ideas I've had to improve the algorithm (based on the flaws he noted), and some early test results of my implementation of them.
> Miku
Interestingly, the same researcher in charge of the VOCALOID software is now in charge of research for Voicemod.
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