dBA — единица измерения громкости звука.
dBA, dBB, dBC, dBD — опорные уровни выбраны в соответствии с частотными характеристиками «весовых фильтров» в соответствии с кривыми равной громкости (см. Фон).
Environmental noise measurement - A-weighted decibels are abbreviated dB(A) or dBA. When acoustic (calibrated microphone) measurements are being referred to, then the units used will be dB SPL referenced to 20 micropascals = 0 dB SPL. dBrn adjusted is a synonym for dBA.
A-weighting is the most commonly used of a family of curves defined in the International standard IEC61672:2003 and various national standards relating to the measurement of sound pressure level, as opposed to actual sound pressure. The others are B, C, D and now Z weightings
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