PSY 3108 Lecture Notes - Density Of Air, Wave, Wind Wave
19 Aug 2014
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Chapter 5 in chaudhuri: philosophical aside: if a tree falls in the forest and no one is there to hear it, qualities of sound energy and sound, anatomy of the ear, auditory brain areas perception. Two waves with same frequency but different amplitudes. A tuning fork vibrates sinusoidally, thus producing a pure tone. Two waves with same amplitude but different frequency. Sound pressure level increase in subjective loudness: that is, log nature of the decibel scale compensates (roughly) for response compression in the auditory system. 1000: ambient (reference) pressure is 40 pa and a pressure wave is hitting your ear with an amplitude of 40000 pa. How many decibels is that? db = 20 x log10(40000/40) db = 20 x log10(1000) db = 20 x 3 = 60 db. Example for self-test: reference pressure is 20 pa and a pressure wave is hitting your ear with an amplitude of 20.
