hear-loss-conduct-slides-080604-1

hear-loss-conduct-slides-080604-1 - Conductive Hearing Loss...

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Conductive Hearing Loss and Carhart’s Notch Mark Domanski, M.D. Tomoko Makishima, M.D., Ph.D University of Texas Medical Branch Department of Otolaryngology Grand Rounds Presentation June 4, 2008
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Conductive Hearing Loss and Carhart’s Notch Physics of Sound Physics of Conductive Hearing Tympanogram and the Acoustic Reflex Physiopathology of Carhart’s Notch Diagnostic Implications of Carhart’s Notch
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Conductive Hearing Loss and Carhart’s Notch Physics of Sound Physics of Conductive Hearing Tympanogram and the Acoustic Reflex Physiopathology of Carhart’s Notch Diagnostic Implications of Carhart’s Notch
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Frequency Wavelength Period Amplitude Intensity Speed Direction
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Frequency Wavelength Period Amplitude Intensity Speed Direction Cycles per second (Hz)
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Frequency Wavelength Period Amplitude Intensity Speed Direction distance between repeating units of a propagating wave
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Frequency Wavelength Period Amplitude Intensity Speed Direction Implication of a repeating event
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Frequency Wavelength Period Amplitude Intensity Speed Direction The amplitude is a nonnegative scalar measure of a wave's magnitude of oscillation
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Frequency Wavelength Period Amplitude Intensity Speed Direction intensity is a measure of the energy flux . "intensity" is not synonymous with "strength", "amplitude", or "level“
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Sound Intensity is Analogous to Electrical Flux •If a point source is radiating energy in three dimensions and there is no energy lost to the medium, then the intensity decreases in proportion to distance from the object squared http://web.ncf.ca/ch865/graphics/ElectricFlux
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Frequency Wavelength Period Amplitude Intensity Speed Direction distance such a wave travels per unit time speed 770 mph, or 1130 ft/s) in dry air at 70 degrees F speed of sound increases with the stiffness of the material decreases with the density
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Frequency Wavelength Period Amplitude Intensity Speed Direction
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Resonance: The tendency of a system to oscillate at maximum amplitude at certain frequencies Small periodic driving forces can produce large amplitude vibrations If the monkey pushes the ball at the natural frequency (fundamental frequency) of the swing, the ball will go higher and higher resonance no resonance
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Haunted Swing http:// www.youtube.com/watch?v=l54W2gM-gYM
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Pitch not an objective physical property a subjective psychophysical attribute perceived fundamental frequency of a sound perceived pitch may differ because of overtones, or partials, in the sound.
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Timbre Why two guitars sound different even when they play the same note “the psychoacoustician's multidimensional wastebasket category “ S McAdams , A Bregman, Hearing Musical Streams, Computer Music Journal, 1979.
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This note was uploaded on 12/28/2011 for the course STEP 1 taught by Professor Dr.aslam during the Fall '11 term at Montgomery College.

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hear-loss-conduct-slides-080604-1 - Conductive Hearing Loss...

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