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Single Event Noise Exposure Level (SEL or LAX) |
| The Single Event Noise Exposure Level is the Aweighted level which, if maintained for a constant period of 1 s, would convey the same sound energy as is actually received from a given noise event. |
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Sensorineural hearing loss |
| An irreversible hearing loss involving the hair cells and nerves of the inner ear. |
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Sentence intelligibility |
| A measure of the comprehension of sentences which ranges from 0% to 100%. It depends strongly on the content and context of the sentence material. The articulation index can be used to estimate the sentence intelligibility. |
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Speech interference level (SIL, dB) |
| A measure of the ability of a sound to interfer with speech. It is the arithmetic average of the 500, 1000 and 2000 Hz octave-band sound pressure levels. |
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Sound power (W, watts) |
| The power which is radiated by a sound source. It is an extremely small power for most normal acoustical sources. |
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Sound pressure (p, pascals) |
| The fluctuations in pressure above and below normal atmospheric pressure caused by a sound wave. For normal sounds the variations in pressure are approximately one-millionth of an atmosphere. |
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Sound power level (Lw, dB re 10-12 watt) |
| The level in decibels of a sound power source. The reference power for the logarithmic scale for sound power level is 1 picowatt (10-12 watt). |
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