The decibel (dB) is a unit that indicates the ratio of a physical quantity (usually power or intensity) relative to a specified or implied reference level. Decibel is always a comparison between two values. As a result of this, even though the measured values differentiate, a decibel unit is the same. It is generally assumed to be a sound unit; but more accurately a decibel is used in acoustics to quantify sound pressures. In this literature, 0 dB is defined as the human threshold of hearing.
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