Lpeak
Lpeak : The highest unweighted (linear) peak sound pressure level in decibels, and is ten times the logarithm, to the base ten, of the ratio of the square of the maximum instantaneous sound pressure to the square of the reference sound pressure (20 micropascals). It is determined by sound measuring equipment with 'P' time-weighting, as specified in the International Standard IEC 651:1979. NOTE: The maximum instantaneous sound pressure level (Lpeak) is not the same as the maximum rms level (Lmax)
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