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本文介绍了精确测量电声器件或设备的指向性因子的测量原理和方法，并对声级计的指向性因子进行了测量，提供了一个非旋转对称的设备的指向性因子的精确测量的例子。
This article describes the measurement principle and method for accurately measuring the directivity of an electroacoustic device or device and measures the directivity of the sound level meter to provide an example of an accurate measurement of the directivity of a non-rotationally symmetric device .