Ls - Sound Exposure Level

Sound Exposure Level - Ls - describes noise from a varied source.

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The Environmental Protection Agency - EPA - has adopted a system of four "sound descriptors"

to summarize how sound is heard and measured, and to determine the impact of noise on health and welfare.

Sound Exposure Level - Ls

measures the sound's change from moment to moment when the sound varies. This varied duration measurement combines the maximum sound level with the length of time during which the sound level is greater than a certain number of decibels below the maximum level.

By summing the intensity by the exposure duration the total energy of the sound can be measured.

Sound Exposure Level - Ls - can be used to describe noise from a moving sources such as airplanes, trains, trucks, etc.

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Related Topics

  • Acoustics Room acoustics, acoustic properties - decibel A, B and C, Noise Rating (NR) curves, sound transmission, sound pressure, sound intensity, attenuation ..

Related Documents

  • Fans and Sound Power Generation The Sound Power Level from fans depends on the motor power and the capacity of the fan - the static pressure and/or the discharged volume. 

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