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Approved noise, in dB

Approved noise, in dB

Decibels may lead to confusion as there are dozens of them! Why? It's a logarithmic ratio, a division with different denominators so you could count as many types of decibels as possible numbers to establish the reference.

A usual one is dBu, where the reference denominator is 0.7746 volts and the numerator is root mean square voltage. If you have 1 volt of RMS voltage, the calculation is:

20 * log10 ( 1 / 0.7746) = ~2.2185 dBu

The dB must be logarithmic as the ear system processes audio logarithmically!

Here are some common, rough values in dBA, the A-weighted decibels... This means how the human ear system perceives sound and it's corrected due to the lesser definition in low frequencies:

20 dB(A) Quiet room

60 dB(A) Normal conversation (without dishes flying)

90 dB(A) Electric hand tool, noisy

[ Protection very recommended ]

110 dB(A) Live concert

120 dB(A) Pain threshold

140 dB(A) Jet turbine, near

At residential areas, perhaps 65 - 60 dB are widely allowed, sometimes a bit more.

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