PSY280H1 Lecture : PSY 280 L09.26
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PSY280H1 Full Course Notes
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Document Summary
Sounds are created when objects vibrate: vibrations of object cause molecules in object"s surrounding medium to vibrate as well, which causes pressure changes in medium, longitudinal direction, speed of sound depends on density of medium. Basic qualities of sound waves: amplitude magnitude of displacement of a sound pressure wave, intensity amount of sound energy falling on a unit area. Measured in decibels sound pressure level (db spl: decibels ratio between the pressure of some sound and the pressure of a reference sound p0 (~minimum) Db = 20*log(p/p0); e. g. , 20*log(2) = 6: loudness the psychological aspect of sound related to perceive intensity or magnitude. Humans can hear across a wide range of sound intensities: ratio between faintest and loudest sounds is more than one to one million, Basic qualities of sound waves (2: frequency for the sound, the number of times per second that a pattern of pressure change repeats.
