Sound - Ls - Exposure Level
The Environmental Protection Agency - EPA - has adopted a system of four "sound descriptors"
- A-weighted sound level
- Sound Exposure Level - Ls
- Equivalent Sound Level - Leq
- Day-Night Sound Level - Ldn
to summarize how sound is heard and measured and to determine the impact of noise on health and welfare.
Sound Exposure Level - Ls
The Sound Exposure Level - Ls - measures the sound change from moment to moment with variable sound. The maximum sound level and the length of time with the sound level greater than certain sound pressure levels are measured.
By accumulating intensity and exposure duration the total sound energy can be measured.
Sound Exposure Level - Ls - can be used to describe noise from moving sources such as airplanes, trains, trucks, etc.
Related Topics
• Acoustics
Room acoustics and acoustic properties, decibel A, B and C, Noise Rating (NR) curves, sound transmission, sound pressure, sound intensity and sound attenuation.
Related Documents
Decibel A, B and C
Sound pressure filters that compensates for the hearing sensed by the human ear.
Fans - Noise Power Generation
The sound generated by a fan depends on the motor power, the volume capacity, the static pressure increase and the discharged volume.
NC - the Noise Criterion
Noise Criterion - NC - level is a standard uesd to describe the relative loudness of a space within a range of frequencies.
Noise - Acceptable dBA Level
Acceptable noise - dBA - level at typical common locations.
Sound - Ldn - Day and Night Level
The EPA A-weighted sound level day and night equivalent definition - Ldn - for a 24 hour period.
Sound - Leq - Equivalent Level
The EPA Equivalent Sound Level - Leq - quantifies the noise environment to a single value of sound level for any desired duration.
Sound Pressure Level - OSHA A-Weighted per Day
OSHA maximum A-weighted sound pressure levels allowed per day.