LING 330 Lecture Notes - Lecture 7: Sound, Sound Energy, Waves
14 Nov 2015
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Amplitude: the increase or decrease of air pressure at a given point during a sound (= the amount of acoustic energy present!) The greater the amplitude the higher the crest (and deeper the troughs) of the waves. The amplitude indicates the intensity of the sound. Velocity of particle movement must not be confused with velocity of sound wave propagation! Particles change velocity; sound wave movement is constant! At normal atmospheric conditions, sound travels through air at about. A waveform is an amplitude by time display. it represents particle motion it also represents pressure variation as a function of distance from the source. The movement of any particle, were it visible, would not look like a waveform by which it is traditionally represented. A waveform is an abstract representation of the displacement from rest which the particle (a) (b) (y or vertical axis) (x or horizontal axis) Study figure 10-4. undergoes during a certain time span.
