Decibel (dB) is a relative logarithmic quantity that numerically characterizes the ratio of two physical quantities. Usually, in decibels, the amplitude of the sound is measured. A difference of 6 dB means an amplitude difference of 2 times, of 12 dB – 4 times (that is, if A1 is one amplitude and A2 is another, then the difference in decibels X is calculated by the formula: X = 20 * log (A1 / A2) when lg is the base 10 logarithm. For 0 dB, they often take either the quietest sound a person can hear or (in digital audio) the loudest sound, not exceeding the allowable range of amplitudes.

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