DB(A) DB(A)

DB(A) - Definition and Overview
The title given to this article is incorrect due to technical limitations. The correct title is dB(A).


DBA.gif
Image:DBA.gif

dB(A) or dBA stands for decibels adjusted. It is the weighted absolute, calculated in dB (SPL) (decibels referenced to the sound pressure level SPL of 20 micropascal = 0 dBA).

Usually the dBA is used for determining the sound exposure of humans. The A indicates a certain frequency weighting representative for the noise sensitivity of the human ear. In Europe, the dBA is generally used in all sorts of noise regulations. dB(B) and dB(C) are similar measurements using different weighting curves.

Note: The use of F1A-line or HA1-receiver weighting must be indicated in parentheses as required. A sound level of 0.63 pascal 1000 Hz tone will read +90 dBA, but the same sound pressure as white noise, randomly distributed over a 3 kHz band (nominally 300 to 3300 Hz), will read +82 dBA, due to the frequency weighting.

Manufacturers give the dBA rating for each appliance. The lower, the rating the quieter the appliance when it is operating.

Synonym: dBrn adjusted.

Source: from Federal Standard 1037C and from MIL-STD-188, plot of the filtercurve from J. Wolfe, University of New South Wales (http://www.phys.unsw.edu.au/~jw/dB.html)

Example Usage of DB(A)
HALKA797: これ本当にすごいことだと思いますhttp://gyazo.com/e0aa3087dacd8fa6e5dee4a050db7845.png
toddymatt: @Elsey_Who_Else. Tell DB Mackems not racists. Sad scum need to take a look at themselves.
cthomas18: @dughall I liked the styling of DB Primary when I saw a flyer, but ideally we want a platform that will aid transition to secondary.
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