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Where Lpd2 is the sound strain level on the new distance from the noise source, Lpd1 is the sound strain degree on the original distance, d1 is the original distance, and d2 is the brand new distance. Occasionally, it’s essential to convert a

 

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set of octave band sound pressure levels into an equivalent A-weighted sound level. This is easily accomplished by making use of the A-scale correction components for the nine normal octave middle frequencies and mixing the corrected values by decibel addition. The A-scale correction factors are the values of the A-weighting

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