本标准定义了用于测试的首选频率和标称滤波器带中心频率 声学测量。恒定带宽百分比滤波器组的精确滤波器中心频率为 使用顺序整数带数计算。纯天然气首选频率之间的差异 描述了音调测量和恒定带宽百分比滤波器中心频率。

This standard defines preferred frequencies and nominal filter band center frequencies to be used for acoustical measurements. Exact filter center frequencies for constant percent bandwidth filter banks are calculated using ordinal integer band numbers. The differences between the preferred frequencies for pure tone measurements and constant percent bandwidth filter center frequencies are described.