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Intensity

Intensity. Scales Exponents Logarithms dB dB SPL. Scales. Linear Ratio. Exponents. Shorthand method of displaying very large or small numbers Numbers greater than 1 involve positive exponents Numbers less than 1 involve negative exponents. Logarithms.

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Intensity

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  1. Intensity • Scales • Exponents • Logarithms • dB • dB SPL

  2. Scales • Linear • Ratio

  3. Exponents • Shorthand method of displaying very large or small numbers • Numbers greater than 1 involve positive exponents • Numbers less than 1 involve negative exponents

  4. Logarithms • Base 10 logarithms used in the decibel • Examples • 1000 = 10 4 = 4 • 1 = 10 0 = 0 • .001 = 10 -3 = -3

  5. Decibel • Standard measure of intensity • dB = 20 (log Po / Pr) • Where Po = pressure output • Where Pr = pressure reference

  6. dB SPL • Decibel Sound Pressure Level (dB SPL) • Standard reference level. • dB SPL = 20 (log Po / 20µPa) • Where Pa = Pascal (measure of force) • dB SPL = 20 (log Po / .0002 dynes/cm2) • Where dynes are a measure of force

  7. Summary

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