The main focus of this master’s thesis in engineering acoustics was to uncover the underlying mechanisms of the modes of Complete Vocal Technique. The key result of the thesis is a set of three dimensional models, showing the geometry of the vocal tract. These models illustrate the geometry of the airway while singing in Neutral, Curbing, Overdrive and Edge. The models where used for further study of the acoustics, however without solid conclusions to what the precise mechanisms of the modes are. The collected data and knowledge in this thesis opens up the possibilities for more detailed study of the acoustics.

Through a study of the anatomy and physiology of the singing voice, the basic knowledge for approaching this problem was acquired. The technique could then be analysed for clues about the key factors, and it was stated that one of them was the aero-acoustic coupling between the vocal tract and the vocal folds. To analyse this hypothesis, data describing the geometry of the vocal tract was acquired through MRI scanning, which resulted in a set of simple one dimensional area function of the vocal tract, describing the cross-section from the vocal folds to the lips. The extraction of this area function was partly validated through simulation and experiments. After the process of acquiring the data for the model, little time was left for the actual study of the coupling. A preliminary study of the vocal tract impedance was performed and a simple model of the vibration and flow through the vocal folds coupled to the vocal tract was performed.

You can download the PDF here

Jesper Pedersen  Acoustic Engineer

Electroacoustic developer at Oticon A/S 2013 – Copenhagen, Denmark

Msc. Engineering Acoustics, DTU 2011-2013 – Copenhagen, Denmark

  • Advanced Acoustics
  • Electroacoustics
  • Vibroacoustics
  • Psychoacoustics
  • Room/Building Acoustics
  • Acoustic measurement technique

Bsc. Mechanical and Production Engineering, Aalborg University 2007-2010 – Aalborg, Denmark

Independent musician, singer and guitarist


+45 23 98 94 83


Written by Jesper Pedersen