本美国国家标准规定了确定声功率级或声音的方法 来自混响试验室中测量的声压级的噪声源能量级。这个 声功率级（或者，在噪声爆发或瞬态噪声发射的情况下，声能量级） 由噪声源产生，在宽度为三分之一倍频程的频带内，使用以下公式进行计算: 测量，包括考虑到气象条件之间任何差异的修正 在试验的时间和地点，以及与参考特性阻抗相对应的时间和地点。 给出了直接法和比较法的测量和计算步骤 确定声功率级和声能级。

This American National Standard specifies methods for determining the sound power level or sound energy level of a noise source from sound pressure levels measured in a reverberation test room. The sound power level (or, in the case of noise bursts or transient noise emission, the sound energy level) produced by the noise source, in frequency bands of width one-third-octave, is calculated using those measurements, including corrections to allow for any differences between the meteorological conditions at the time and place of the test and those corresponding to a reference characteristic impedance. Measurement and calculation procedures are given for both a direct method and a comparison method of determining the sound power level and the sound energy level.