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Decibels

Decibels. 16.8. Decibels. Unit of measure to compare two sound intensities. Based on how human ear perceives loudness. If you double the intesity, I, the sound isn’t twice as loud. Use a logarithmic scale. Decibels. Where  = intensity level  I and I 0 are intensities of two sounds

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Decibels

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  1. Decibels 16.8

  2. Decibels • Unit of measure to compare two sound intensities. • Based on how human ear perceives loudness. • If you double the intesity, I, the sound isn’t twice as loud. • Use a logarithmic scale

  3. Decibels • Where •  = intensity level  • I and I0 are intensities of two sounds • I0 is usually 1.0 x 10-12 W/m2 • Unit: dB (decibel) • An intensity level of zero only means that I = I0 since log (1) = 0

  4. Intensity vs Loudness • Intensity can be measured • Loudness is simply how ear perceives • Doubling intensity does not double loudness

  5. Example • You double the intensity of sound coming from a stereo. What is the change in loudness? • 2 - 1 = 3 dB • Experiment shows that if the intensity level increases by 10 dB, the sound will seem twice as loud.

  6. Practice Problems • Let me listen to low dB of your working on these • 477 CQ 15, P 59 – 62 • Total of 5 Problems

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