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Это уже понятнее :) dB(A)
A-weighted sound pressure level
Definition:
Twenty times the common logarithm of the ratio of the root-mean-square A-weighted sound pressure amplitude to the reference sound pressure 20 µPa, which corresponds approximately to the threshold of human hearing at 1000 Hz. Sound pressure level is usually reported as NN.N dB(A), where N are numeric values.
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