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1.前言[略] 2.噪声基础知识 声量的表示方法有两种: a.直接用物理量表示的方法。 b.用与人耳感觉相应的量表示的方法。 b法,是在用a测定量里,通过随频率而不同的计权滤波器测定的量。这个滤波器的特性国际上有规定,分A、B、C三种。在噪声的评价中,一般认为用A计权最好。 有关声音的量,如表——1所示。各种量的标准量为X,则表示各种音量X的能级Y(分贝)用下列公式表示。
1. Foreword [Slightly] 2. Basic knowledge of noise There are two ways to represent the amount of sound: a. Direct physical quantities expressed. b. A method expressed in an amount corresponding to the human ear. The b-law is the amount measured by a weighting filter that varies depending on the frequency in the a-measurement. The characteristics of this filter international regulations, points A, B, C three. In the noise evaluation, it is generally considered the best weight with A. The amount of sound, as shown in Table - 1. The standard amount for each of the quantities is X, which means that the energy level Y (decibels) of the various volume levels X is expressed by the following formula.