sum_lecture09

sum_lecture09 - T he Physics of L ight & Sound Sound...

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The Physics of Sound Waves Drs. Paulson and Scully GSCI 121 Spring 2011
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Sound Intensity I live near the Charlottesville Pavillion and frequently walk by concerts. As I get further away, the sound quality seems to get worse and worse. Why? Even the most basic stereos have “bass”and “treble” controls. More sophisticated equipment might have a 5 or 7 band equalizer. A very good amplifier will have a volume button not labeled “volume” but rather “loudness” that will change the volume of these different channels according to the previous chart.
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Quality of Sound We can connect the physical properties of waves to our perception of sound. Stimulus Perception Amplitude Loudness Frequency Pitch Wave Shape Timbre
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A sound must differ by a factor of at least 1.5x in loudness before humans can perceive it. (This is a change of about 1.7 dB) A pitch must be different by at least 0.3% before the human ear discerns it as different. Thus
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sum_lecture09 - T he Physics of L ight & Sound Sound...

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