IEC 60268-21:2018规定了一种适用于电声换能器以及无源和有源音响系统的声学测量方法，如扬声器、电视机、多媒体设备、个人便携式音频设备、汽车音响系统和专业设备。被测器件（DUT）可以包括在无源致动器执行将电输入转换成声输出信号之前执行模拟和数字信号处理的电气部件。本文件仅描述了评估DUT在任意模拟或数字输入信号与系统近场和远场中任何点的声输出之间的传输行为的物理测量。这包括在小信号域和大信号域中操作DUT。目标应用的声学边界条件的影响（e。 g.汽车内部）也可以在音响系统的物理评估中考虑。本文件不评估再现声音的感知和认知评估以及感知声音质量的影响。

IEC 60268-21:2018 specifies an acoustical measurement method that applies to electro-acoustical transducers and passive and active sound systems, such as loudspeakers, TV-sets, multi-media devices, personal portable audio devices, automotive sound systems and professional equipment. The device under test (DUT) can be comprised of electrical components performing analogue and digital signal processing prior to the passive actuators performing a transduction of the electrical input into an acoustical output signal. This document describes only physical measurements that assess the transfer behaviour of the DUT between an arbitrary analogue or digital input signal and the acoustical output at any point in the near and far field of the system. This includes operating the DUT in both the small and large signal domains. The influence of the acoustical boundary conditions of the target application (e.g. car interior) can also be considered in the physical evaluation of the sound system. This document does not assess the perception and cognitive evaluation of the reproduced sound and the impact of perceived sound quality.