本美国国家标准规定了确定声功率级或声音的方法 噪声源的声压级来自于在包围噪声的表面上测量的声压级 给定要求的测试环境中的源（机械或设备）。声音 产生的功率级（或者，在噪声爆发或瞬态噪声发射的情况下，声能级） 通过使用这些测量值计算应用了频率A加权的噪声源。

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 on a surface enveloping a noise source (machinery or equipment) in a test environment for which requirements are given. The sound power level (or, in the case of noise bursts or transient noise emission, the sound energy level) produced by the noise source with frequency A-weighting applied is calculated using those measurements.