初接触噪声和振动工程的同志,常对“分贝”这一单位感到生疏.不了解为什么要用分贝,运算时有些不习惯,对一些显然不同的量都用分贝来表示感到迷惑不解,对分贝究竟是一个绝对单位还是一个相对单位不甚明瞭等等.要讲清这一个问题,让我们先从声音强弱的“分等”、“分级”办法谈起吧! Comrades who came into contact with noise and vibration engineering often feel unfamiliar with the unit of “decibel.” I do not understand why decibels are used, and some are not used at the time of operation. I am puzzled by decibels in apparently different quantities. Decibel is an absolute unit or a relative unit is not clear, etc. To clarify this one issue, let us start with the voice of the “grading”, “graded” approach to talk about it!