“decibel”的概念、定义、习题解题方法及翻译-物理辞典

单词	decibel
释义	decibel A unit used to compare two power levels, usually applied to sound or electrical signals. Although the decibel is one tenth of a bel , it is the decibel, not the bel, that is invariably used. Two power levels P and P₀ differ by n decibels when n = 10log₁₀P/P₀ . If P is the level of sound intensity to be measured, P₀ is a reference level, usually the intensity of a note of the same frequency at the threshold of audibility. The logarithmic scale is convenient as human audibility has a range of 1 (just audible) to 10¹² (just causing pain) and one decibel, representing an increase of some 26%, is about the smallest change the ear can detect
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