The Transient Theory of Human Voice Production with Dr Julian Chen
Sunday 16th April 2023, 5:00 PM - 7:00 PM (London Time)
This event is free-to-attend as part of our World Voice Day celebrations.
In 1957, French physiologist Philippe Fabre invented the electroglottograph, which can accurately determine the closing and opening instants of the glottis in vivo. In 1984, Donald Miller and Harm Schutte further placed two pressure sensors immediately above and below the glottis, measured the air pressures across the glottis.
This experimental evidence enabled a scientific understanding of human voice production.
And so a refined version of the transient theory of human voice production, the timbron theory, initially proposed by Leonhard Euler in 1727, is established. In this lecture, experimental output and the timbron theory of human voice production are presented in an easy to understand graphical format.
Content:
According to that theory, the time between two adjacent glottal closing instants accurately defines the pitch period, and the sound waveform in each pitch period contains full information on the timbre. A method of extracting glottal closing instants from sound waves and a graphical display, the pitch-synchronous spectrogram, are presented.
Among the samples of human voice, the sound recordings of Luciano Pavarotti are analyzed. Some characteristics of the master singer are shown, and hints of how to improve the quality and volume of voice are presented.
Finally, the theory and parametrization method for human voice developed in early 20th century, the source-filter theory and linear prediction coefficients (LPC), are outlined.
Comparing with the more accurate timbron theory and pitch-synchronous parametrization method, the deficiencies of the source-filter theory and the LPC method are discussed.
Dr Julian Chen
Julian Chen received a PhD in Physics from Columbia University in 1985, then joined IBM Research Division as a Research Staff Member...
World Voice Day
World Voice Day takes place on 16th April annually. It is acknowledged across the globe, with the main goal being to increase awareness of voice and voice issues.
Sorry, this is an archived short course...
We have plenty of upcoming short courses coming soon. See details of some of them below or look at the full list of short courses.
Tuesday 5th May 2026
2:00 PM - 4:00 PM
Tuesday 12th May 2026
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Tuesday 19th May 2026
2:00 PM - 4:00 PM
Tuesday 26th May 2026
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Tuesday 2nd June 2026
2:00 PM - 4:00 PM
Tuesday 9th June 2026
2:00 PM - 4:00 PM
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Voice pedagogy has advanced significantly in the last decades in relation to knowledge of the vocal apparatus (anatomy and mechanics), acoustics, and performance psychology (to name just a few subfields) – this is a wonderful thing! Nonetheless, musicianship and the foundations of music theory are still relevant to the teaching and coaching of singers and this course aims to empower voice teachers and coaches with skills to support the fundamental musicianship development of their students.
Thursday 21st May 2026
5:00 PM - 7:00 PM
(London Time)
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Louisa Morgan
This 2-hour interactive session is designed to help you make more deliberate, expressive choices in your speaking of the written word. It will involve plenty of practical exploration and will cover tips and techniques for working with the voice to lift the text off the page. Work with me to refine nuance, precision, and expressive range. We’ll explore a variety of text samples to cover a wide range of real-world situations, so you can get a feel for the different styles and approaches. If you want your spoken text to sound purposeful, engaging, and unmistakably yours, this session will invite you to play with some tools to do just that.
Tuesday 26th May 2026
5:00 PM - 7:00 PM
(London Time)
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