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V <br /> ° ! <br /> Noise Event - A term referring to a single continuous noise <br /> emission. This most commonly is used in reference to aircraft <br /> but may indicate any other source of noise that begins and <br /> ends in a relatively short period of time. <br /> Peak Level - The highest level of sound reached instantaneously <br /> measured either in a weighted mode or unweighted mode. The ear <br /> will hear this level in the case of impulse noises while a <br /> sound level meter may not indicate this high a level if the <br /> operator is using only the "fast" or "slow" response. <br /> Sound Equivalent Level (SEL) , Single Event Noise Level (SENL) , <br /> Single Event Noise Equivalent Level (SENEL) - Integrated sound <br /> level for a period of time. This measure is defined by some <br /> as Lax. The period for this measure will have specific limits <br /> described by time and, and in most instances, by a sound level <br /> that has been exceeded. Remember, These levels are for <br /> Ft. sound energy affecting a location. <br /> F Sound Level Meter - An instrument for measurement of the level of <br /> sound. This may be a very simple meter with only two or three <br /> options for setting up the response modes or it may be a very <br /> complicated device that will retain a diverse group of <br /> measurements electronically. It is normally used for real time <br /> measurements. An environmental noise monitor will usually <br /> contain a sound level meter function. <br /> F. Sound Levels Exceeded (Ln) - See Levels Exceeded. <br /> Weighted Sound Level (A or C) - An artificial adjusting of the <br /> F": <br /> sound level to depict the ability of the human ear to deter- <br /> mine the sound level. Either weighting method reduces the <br /> value of lower frequency sound to account for the ear's <br /> ability to better hear these sounds. (See also "A" Weighting <br /> and "C" Weighting) . <br /> s <br /> F 10 <br />