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Acoustic Properties of Model Human Vocal Folds

Acoustic Properties of Model Human Vocal Folds. Phillip Robinson & Professor Bodony. Background. Sound is created in the larynx which is located in the neck Sound created through interruption of airflow by movement of vocal cords

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Acoustic Properties of Model Human Vocal Folds

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  1. Acoustic Properties of Model Human Vocal Folds Phillip Robinson & Professor Bodony

  2. Background • Sound is created in the larynx which is located in the neck • Sound created through interruption of airflow by movement of vocal cords • The sound travels from the larynx through the throat and out the mouth while being manipulated by features

  3. Purpose • Explore the geometry of the throat and how it affects sound propagation • Map out regions of the geometry where sound can be efficiently generated

  4. Research Method • Literature review from Ingo R. Titze’s Principles of Voice Production • Grid data supplied by Prof. Bodony examined with Tecplot • Animation of VF created • Selected cases were chosen for closer analysis using UIUC Turing Cluster

  5. Results & Discussion • Grid data provided illustration of VF during sound production • Vocal fold motion determined by eigenmode analysis of the vocal folds with realistic material properties • Eigenmode analysis was carried out by Professor R. Mittal at George Washington University

  6. Results & Discussion cont. • Plot of min & max distance between VF as a function of time • Cases represent point at maximum and minimum distance

  7. Investigation carried out on two cases Case 1. Max opening for the glottis Case 2. Min opening for the glottis Case 1. Glottis thickness is 1mm wide Sound propagation shown traveling through throat and interacting with VF Results & Discussion cont.

  8. Maximum Distance Case

  9. Minimum Distance Case • Thickness of glottis is 0.2mm • Sound propagates through glottis • Found general features were same • Efficient areas located within glottis as well as 1cm downstream of the glottis

  10. Conclusion • Sound propagation is complex process • Various areas of throat mapped • Approx 1 cm downstream of glottis is an efficient area to create sound • Both cases share similar findings • Future works include mapping throat in other types of situations

  11. Acknowledgement • Professor Bodony for guidance and financial support • NASA Illinois Space Grant Consortium • National Science Foundation

  12. References • http://training.seer.cancer.gov/ss_module06_head_neck/unit02_sec08_anatomy.html • Titze R., Ingo. Principles of Voice Production. National Center for Voice and Speech, New York 2000

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