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GepubliceerdElke Bosmans Laatst gewijzigd meer dan 9 jaar geleden
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Een nieuwe stem voor stemlozen fysica, biologie en techniek voor een stembandprothese Bart Verkerke Universitair Medisch Centrum Groningen
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After laryngectomy
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Clinical study
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Goal of the project Voice-producing prosthesis
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SCHEMATIC VIEW OF THE VOCAL SYSTEM Flanagan (1965)
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Source-filter theory Vocal folds Resonance cavities SOURCE FILTER exhalatory air primary voice signal final voice signal n Frequency (pitch) n Primary intensity (loudness) n Duration of phonation n Primary voice quality (breathiness, hoarseness,…) n Vowels + consonants n Final intensity (loudness) n Secondary voice quality (resonance, singer’s formant…)
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SOURCE FILTER THEORY VOWELS FORMANTS
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1 st and 2 nd formants in vowels
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Vocal cords / folds
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Demonstration of laryngeal videos Phonation and Inspiration Recording made by the National Center for Voice and Speech, Denver, CO, USA
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Pitch control Cricothyroid muscle (CT) Thyroid cartillage Cricoid cartillage Arytenoid cartillages From Svec (1996)
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Mechanism of vocal fold vibration From Svec (2000)
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Vocal fold visualization: stroboscopy Kay Elemetrics Demo examples on Stroboscope
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Design strategies voice producing element Electronically Mechanically: Flexible airway reduction in present shunt valves Three possible strategies
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Lip principle
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Verification with prototypes PolyUrethane Titanium
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Lung model
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Clinical study
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Membrane principle PU, Ti, Lead + gold
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Membrane principle
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Eureka project Newvoice
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Workshop Inleiding over stem en spraak Samenstellen klinkerdriehoek Simulatiemodel aanzetstuk Eisen aan de prothese Potentiële geluidsbronnen genereren Testen van potentiële geluidsbronnen Hoe dit onderwerp in het onderwijs in te bouwen
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VOCAL TRACT SHAPE Dedouch, Svec, Horacek, Krsek, Havlik & Vokral (2003)
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Requirements Geometry: in shunt valve Sound –fundamental frequency:110 Hz ♂, 210 Hz ♀ –SPL: 65 dB - 80 dB at 30 cm –Frequency-variation: +18%, -6% Energy source: 0.4 - 1.5 kPa, 180 - 320 ml/s Power spectrum: decay of 10-12 dB/octave Independent from subglottal and vocal tract High reliability
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BMT-onderwijs: de kunst van het beter maken
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International Biomedical Engineering
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