CMD 276 Lecture Notes - Lecture 1: Auditory System, Simple Harmonic Motion, Ambient Pressure
26 Jan 2017
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Document Summary
Cmd 276 - lecture 1 - hearing and speech science. Series of vibrations of molecules in a medium. Waves of tiny fluctuation in air pressure that radiate from the source. Eardrums vibrate when those pressures reach our ears. Auditory system converts pressure waves to neural impulses that the brain processes, interprets, and classifies. Pressure changes from sound waves localized disturbances from atmospheric/ambient air pressure. Atmospheric = molecules moving at their own, natural rate. When something disturbs molecules, pressure is changed no longer atmospheric. Relationship between the volume of air and pressure. At a constant temperature, when volume decreases air pressure in a container increases proportionately. Air molecules become more tightly packed as pressure increases. As volume increases, pressure and density decrease. A tuning fork vibrates and causes localized air pressure changes. Displaces the molecules next to the tines and pushes them together. Sets up a wave of energy of small increases and decreases in the ambient pressure.
