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 23rd June 2026
5:00 PM - 7:00 PM
(London Time)
Introduction to Vocal Psychotherapy: Songs of the Self
Dr. Diane Austin
This presentation draws on the methods and techniques of Vocal Psychotherapy, a new in-depth model of music psychotherapy developed by Dr. Austin, that incorporates breath work, natural sounds, vocal improvisation, and songs and dialogue within a client and therapist relationship to facilitate intrapsychic and interpersonal change and growth.
Thursday 2nd July 2026
5:00 PM - 7:00 PM
(London Time)
Unclenching the Jaw: Options from the Physio Lens
Walt Fritz
“Jaw tension” is one of many potential problems facing the singer, and can cause a direct negative impact on the performance in both direct and indirect ways. The underlying cause of jaw issues is attributed to numerous factors (technique, posture, strength, range of motion, etc.), making it often difficult to identify common denominators. Join Walt Fritz as he examines the evidence supporting stretching, strengthening, and manual therapy interventions to address jaw-related concerns in vocal performers, taking into account their unique needs.
Monday 6th July 2026
5:00 PM - 7:00 PM
Friday 10th July 2026
5:00 PM - 7:00 PM
Monday 13th July 2026
5:00 PM - 7:00 PM
Friday 17th July 2026
5:00 PM - 7:00 PM
Monday 20th July 2026
7:00 PM - 7:00 PM
Friday 24th July 2026
5:00 PM - 7:00 PM
(London Time)
Certificate in Foundations of Vocology with Adam Roberts
Adam Roberts
This 30-hour Vocology Cohort Intensive provides a comprehensive overview of basic vocal anatomy, physiology, and theories of voice production & perception, fundamentals of vocal health, pathology, evaluation, performance, and habilitation of the speaking and singing voice, and a survey of research, resources, and professional opportunities. Each week, advanced students contribute to cohort-centred learning with additional resources, discussion facilitation, and critical analysis. The course assessment will also be useful for those who wish to prepare for the PAVA recognised designation.