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 28th July 2026
5:00 PM - 7:00 PM
(London Time)
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Robert Edwin
The Balancing Act Model encourages singers to explore the extremes of singing, and from those extremes, establish their most efficient (balanced) voice and performance techniques. Join the renowned singer/actor and author Robert Edwin as he covers many aspects of the singing process including breathing, phonation, resonation, articulation, and attitude. If you’re involved in music theater or opera, you’ll find the Model to be especially helpful in developing character voices for roles such as Nathan and Adelaide in Guys and Dolls. If you’re just looking to find out what your body and voice can do, The Balancing Act Model can provide many answers!
Thursday 30th July 2026
2:00 PM - 4:00 PM
(London Time)
A VOICE FOR THE VOICELESS | Person-Centred Singing Teaching
William Leigh Knight
Only around 3% of the population fall into the category of amusia while over 17% consider themselves ‘tone-deaf’; and this does not account for non-singers, a wider group sometimes described as ‘tuneless’. So, who are ‘the voiceless’? Join William Leigh-Knight as he unpicks this question and considers the purpose of training a voice, when it is considered such a natural human attribute, and he expands on the principles that drive his own practice, which may be summarised as ‘person-centeredness’
Monday 3rd August 2026
1:30 PM - 2:30 PM
Tuesday 4th August 2026
1:30 PM - 2:30 PM
Wednesday 5th August 2026
1:30 PM - 2:30 PM
Thursday 6th August 2026
1:30 PM - 2:30 PM
Friday 7th August 2026
1:30 PM - 2:30 PM
(London Time)
Level Two Certificate in Accents and Phonetics with Louisa Morgan
Louisa Morgan
Build on your foundational knowledge of accents and phonetics in this week‑long lunchtime course designed specifically for voice teachers. Whether you have completed our Level 1 Certificate or already possess a basic working knowledge of phonetics and accent work, this Level 2 course will help you deepen your skills, sharpen your analytical ear, and expand your practical toolkit for teaching.