Topical Terminology > A-weighted Sound Pressure Level
A-weighted Sound Pressure Level
For A-weighted Sound Pressure Level we have a term and definition in Noise Control Engineering.
A-weighted Sound Pressure Level (Noise Control Engineering) 
Ten times the logarithm of the ratio of A-weighted squared sound pressure to the squared reference sound pressure of 20 micropascal, the squared sound pressure being obtained with fast (F) (125-ms) exponentially weighted time averaging. Alternatively slow (S) (1000-ms) exponentially weighted time averaging may be specified. Unit, decibel (dB); symbol, L{sub A}.
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