ANALYSIS OF INFLUENCE OF VOCAL FOLD –VOCAL TRACT MODELS CONNECTION BY USING FEM

Abstract eng:
The Source-filter theory does not take into account many important circumstances for generating of vowels, e.g. the effects of source on filter. One of these effects is investigated in this paper, specifically changing of the glottal gap. Modal analyses were performed using 2-D models comprising a part of trachea, the glottal gap and straightened simplified vocal tracts for various vowels. Based on the modal analyses, classification of each cavity mode (vocal tract/trachea modes) for various glottal gaps was recognized. The glottal gap size ranged between 0 to 10 mm. The results show that some of the first ten natural frequencies of the model are significantly dependent on the glottal gap and the other natural frequencies are almost independent. From the glottal gap size of 5 mm towards lower values, an abrupt change in acoustic pressure occurs in the glottal gap zone. At higher pressure this change is not apparent at all.

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