Sound level A B or C

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)

English