The modal and spectral characteristic belongs among important human acoustic spaces of vocal tract. They occur at generating vowels and other acoustic aspects of human speech. We can observe the resonant phenomena of acoustic cavity of vocal tract in the human speech spectrum, primary however at vowels generation. However near vocal tract occurs series of frequency tops in the spectrum of vowels, which necessarily may not be resonant origin. That is why sometimes quite difficult assign is right frequency tops to resonant tops of acoustic cavity. It consist in operate of acoustic excitation of vocal tracts. The pronounced of vowels loudly and in a whisper has different excitation of vocal tract. At generating vowels loudly is excited by scheme of harmonic components outspread to fundamental frequency of glottis. At talking in a whisper is vocal tract excited by continuous spectrum generated by turbulent fluxion of exhaled flatus over glottis. We give a name "formant" to a frequency, at which happens to resonance of acoustic space. Aim of this work is analysis of Czech vowels formants generated loudly and in a whisper. Experimental metering of these formants was performed on human vocalic tract for all vowels. Further then on artificially created vocalic tracts for vowels A, I. Then were modal characteristics of vocal cavity for vowels A, I, tested by method of final elements with the help of computing program ANSYS. In this work were surveyed courses of acoustic pressures for individual formants, influence sizes vocal tract and influence of correct mouth opening on formants. Also has been effected computational simulation of harmonic excitation on tract by side of glottis.
| Identifer | oai:union.ndltd.org:nusl.cz/oai:invenio.nusl.cz:228247 |
| Date | January 2008 |
| Creators | Matug, Michal |
| Contributors | Vašek, Martin, Mišun, Vojtěch |
| Publisher | Vysoké učení technické v Brně. Fakulta strojního inženýrství |
| Source Sets | Czech ETDs |
| Language | Czech |
| Detected Language | English |
| Type | info:eu-repo/semantics/masterThesis |
| Rights | info:eu-repo/semantics/restrictedAccess |
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