A-Weighting db(A)
A-weighting is the adaptation of objective sound level measurements (unit: dB) to a normal person's subjective sound sensation (unit: dB(A)) on the basis of an internationally standardized frequency weighting curve A. A-weighted values reflect more closely the actual (frequency-dependent) response of the human ear to a specific sound event. Most measurement devices already use A-weighting, but if this is not the case, A-weighting can be applied later using standard values.