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VERSION:2.0
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PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-3482
DTSTART:20140930T170500Z
DTEND:20140930T180000Z
DTSTAMP:20260419T161516Z
LAST-MODIFIED:20140925T061640Z
LOCATION:4274 Chamberlin Hall (Refreshments will be served)
SUMMARY:The chaos in vocal fold vibration and sound production\, Chaos
  & Complex Systems Seminar\, Jack Jiang\, UW Department of Surgery
DESCRIPTION:Vocal fold vibration is key for human speech and communica
 tion. This vibration is driven by airflow and can be regular\, irregul
 ar\, or chaotic. Our study focuses on in what conditions vocal fold vi
 bration will be regular or irregular. Many voice disorders\, such as l
 esions or paralysis\, can lead to irregular voice. We can surgically i
 ntervene to restore healthy and more regular vibration. We also use ac
 oustic parameters\, such as perturbation analysis (jitter and shimmer)
  and nonlinear dynamic analysis (correlation dimension\, second order 
 entropy\, and Lyapunov exponents)\, to describe the irregularity of vo
 ice production. Clinically\, these chaotic parameters show discriminat
 ory power for pathological voice. Typically\, we classify four types o
 f voice: Type 1 (nearly periodic)\, Type 2 (contains strong modulation
 s or subharmonics)\, Type 3 (aperiodic)\, and Type 4 (predominated by 
 stochastic noise characteristics). The challenge is that when the voic
 e has too much turbulence the degree of freedom approaches infinity. S
 uch voice is difficult to quantitatively describe. 
URL:https://www.physics.wisc.edu/events/?id=3482
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