Vocal apparatus, Larynx, Modal voice, Falsetto voice, Phonation larynx fixation

The vocal apparatus serves phonation. It represents a biocybernetic self-regulating system, disposing of a feedback network of the central nervous system. The larynx, functioning as the phonation apparatus of the vocal apparatus, is a source of human voice. We were interested in changes of the larynx positions at intonation in the fundamental singing registers in professional male singers. We investigated changes in the position of the laryngeal structures simultaneously with the aid of an X-ray apparatus, the acoustic and mechanical signals registered by means of the acceleration recorder. It has been found that at phonation with the modal voice a change in the position of the laryngeal structures takes place in two different ways, whereas the larynx movements at falsetto remain the same. For the purpose of compiling the present pieces of knowledge in the field of human voice studies, we have made the software application on personal computers.