Sound level A B or C
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3-1-165
(Weighted) Sound level A, B or C (in decibels)
Twenty times the logarithm to the base 10 of the ratio of the effective value of the sound pressure, this pressure being weighted to conform to the curves A, B or C of the sound level meter, to the reference pressure level (20 micronewtons per square metre or 2.10-4 microbar or 2.10-4 dyne per square centimetre).
Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)
