Acoustic properties of model human vocal folds
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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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Acoustic properties of model human vocal folds

Acoustic Properties of Model Human Vocal Folds

Phillip Robinson &

Professor Bodony


Background

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


Purpose

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


Research method

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


Results discussion

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


Results discussion cont

Results & Discussion cont.

  • Plot of min & max distance between VF as a function of time

  • Cases represent point at maximum and minimum distance


Results discussion cont1

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.


Maximum distance case

Maximum Distance Case


Minimum distance case

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


Conclusion

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


Acknowledgement

Acknowledgement

  • Professor Bodony for guidance and financial support

  • NASA Illinois Space Grant Consortium

  • National Science Foundation


References

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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