[CTN] Applied Math Seminar of possible interest

[Sue Ann Campbell]

There is a seminar this Thursday in the Applied Math department which 
may be of interest.  See details below.

The speaker, Chris Bergevin, (https://www.yorku.ca/cberge/)
has done extensive work on modelling the biophysics of hearing and
sensory processing in the ear. If you are interested in speaking with him
while he is visiting Waterloo, let me know.

Regards,

Sue Ann Campbell


Applied Math Seminar 
Overtone focusing in biphonic Tuvan throat singing
Christopher Bergevin, Department of Physics and Astronomy, York University 
Thursday, November 14.
2:30 p.m.
MC 6460

Abstract

Khoomei is a unique singing style originating from the Central Asian republic of Tuva. Singers produce two pitches simultaneously: a booming low-frequency rumble alongside a hovering high-pitched whistle-like tone. The biomechanics of this biphonation are not well-understood.n Here, we use sound analysis, dynamic magnetic resonance imaging, and vocal tract modeling to demonstrate how biphonation is achieved by modulating vocal tract morphology. Tuvan singers show remarkable control in shaping their vocal tract to narrowly focus the harmonics (or overtones) emanating from their vocal cords. The biphonic sound is a combination of the fundamental pitch and a focused filter state, which is at the higher pitch (1-2 kHz) and formed by merging two formants, thereby greatly enhancing sound-production in a very narrow frequency range. Most importantly, we demonstrate that this biphonation is a phenomenon arising from linear filtering rather than a nonlinear source.


-- 
Dr. S.A. Campbell                   Professor
Department of Applied Mathematics   office: MC6132
University of Waterloo              email: sacampbell at uwaterloo.ca
Waterloo Ontario                    phone:(519)888-4567 x35461
N2L 3G1                             fax:(519)746-4319
Canada                              http://www.math.uwaterloo.ca/~sacampbe

----- End forwarded message -----

-- 
Dr. S.A. Campbell                   Professor
Department of Applied Mathematics   office: MC6132
University of Waterloo              email: sacampbell at uwaterloo.ca
Waterloo Ontario                    phone:(519)888-4567 x35461
N2L 3G1                             fax:(519)746-4319
Canada                              http://www.math.uwaterloo.ca/~sacampbe