| 单词 | decibel |
| 释义 | decibel /des"euh bel', -beuhl/, n. Physics. 1. a unit used to express the intensity of a sound wave, equal to 20 times the common logarithm of the ratio of the pressure produced by the sound wave to a reference pressure, usually 0.0002 microbar. 2. a unit of power ratio, the number of units being equal to a constant times the logarithm to the base 10 of the intensities of two sources. 3. a unit used to compare two voltages or currents, equal to 20 times the common logarithm of the ratio of the voltages or currents measured across equal resistances. Abbr.: dB, db [1925-30; DECI- + BEL] |
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