Your Sound Detector: The Ear.

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Your Sound DetectorThe Ear.

• Perception of Sound Waves
• (vs. Reality of Sound Wave)

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The Ear
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Perceived Sound Levels
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Note vertical scales Left scale deciBel,
linearRight Scale Intensity, logarithmic
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Let sound level equal 30 dB
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• So if several frequencies are played at a
  constant level of 30 dB (or 10-9 W/m2)
• Pitches below 130 Hz cannot be heard.
• Pitches above 14,000 Hz cannot be heard.
• Pitches between 2000 Hz and 4000 Hz will
  perceived as louder than frequencies outside that
  range.