Intensity
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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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Presentation Transcript
Intensity
Intensity

  • Scales

  • Exponents

  • Logarithms

  • dB

  • dB SPL


Scales
Scales

  • Linear

  • Ratio


Exponents
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
Logarithms

  • Base 10 logarithms used in the decibel

  • Examples

    • 1000 = 10 4 = 4

    • 1 = 10 0 = 0

    • .001 = 10 -3 = -3


Decibel
Decibel

  • Standard measure of intensity

  • dB = 20 (log Po / Pr)

    • Where Po = pressure output

    • Where Pr = pressure reference


Db spl
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



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