音响系统设备.第21部分:声学（基于输出）测量

[中文适用范围]： IEC 60268的这一部分规定了适用于电声换能器以及无源和有源音响系统@例如扬声器@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的声学测量方法。被测设备 (DUT) 可以由在无源致动器执行将电输入转换为声学输出信号之前执行模拟和数字信号处理的电子组件组成。本文档仅描述评估 DUT 在任意模拟或数字输入信号与系统近场和远场中任意点的声学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。在声音系统的物理评估中还可以考虑目标应用（例如汽车内饰）的声学边界条件的影响。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。注：本文件中定义的一些测量方法可适用于根据[1]1的耳机@耳机@耳机和耳塞。本文档不适用于麦克风和其他传感器。本文档不需要访问传感器电气端子处的状态变量（电压@电流）。灵敏度@电输入功率和其他基于电阻抗的特性将在专门用于电气和机械测量的单独的未来标准文件@IEC 60268-22@中进行描述。 [外文原描述]： 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.