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Lecture 2 Slides - Review Acoustics Oscillation Modes Back...

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Review Acoustics Scope CD z Oscillation - Back and forth motion corresponding to sound. Has frequency, amplitude and phase. z Modes - Natural frequencies at which objects oscillate. Unique to each object. z Superposition - Sum of oscillations. All complex sounds are a superposition of oscillations. z Diffraction - Bending of sound around objects z Reflection - Bouncing of sound off of objects z Interference - Interaction (sum) of two or more sounds How do we make sense of our surroundings from sound? Frequency Analysis Auditory Physiology: Some History z UW Dept of Neurophysiology z First recordings from auditory nerve z First recordings from hair cells z Tonotopic organization of cortex z Hair cell regeneration Three Major Subdivisions Concha Ossicles Outer Ear Middle Ear Inner Ear Oval Window Cochlea Pinna Ear canal Tympanic membrane Three Major Subdivisions Outer Ear Tour Structure Function\Description Pinna Sound localization, Directionally-dependent filter Concha, Ear Canal Funnels sound to amplify important speech frequencies.
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