IEC 60268-4:20 18 RLV包含国际标准及其红线版本。红线版本只有英文版本。Redline版本为您提供了一种快速简单的方法来比较该标准与其前一版本之间的所有变化。红线版本不是IEC官方标准，只有标准的当前版本才被视为官方文件。 IEC 60268-4:20 18规定了音响系统麦克风的电阻抗、灵敏度、方向响应模式、动态范围和外部影响的测量方法，还详细说明了制造商应指定的特性。它适用于所有语音和音乐应用的音响系统麦克风。它不适用于测量麦克风，但确实适用于具有一个以上声道的麦克风的每个音频声道，例如用于立体声或类似用途。它也适用于嵌入式麦克风和具有数字音频输出的麦克风的模拟特性。就本国际标准而言，麦克风包括所有此类设备，如变压器、前置放大器或构成麦克风整体部分的其他元件，直至制造商指定的输出端子。第6至21条考虑了麦克风的主要特性。附件A和附件C中考虑了附加特性。IEC 60268-4:20 18取消并取代了2014年发布的第五版。本版构成技术修订版。与上一版相比，此版本包括以下重大技术变更: (a)关于"持久性有机污染物"测量的第19.4款取代附件C； b)用于数字域噪声测量的新附录D。

IEC 60268-4:2018 RLV contains the International Standard and its Redline version. The Redline version is available in English only. The Redline version provides you with a quick and easy way to compare all the changes between this standard and its previous edition. The Redline version is not an official IEC Standard, only the current version of the standard is to be considered the official document.

IEC 60268-4:2018 specifies methods of measurement for the electrical impedance, sensitivity, directional response pattern, dynamic range and external influences of sound system microphones, and also details the characteristics to be specified by the manufacturer. It applies to sound system microphones for all applications for speech and music. It does not apply to measurement microphones, but it does apply to each audio channel of microphones having more than one channel, for example for stereo or similar use. It is also applicable to flush-mounted microphones and to the analogue characteristics of microphones with digital audio output. For the purposes of this International Standard, a microphone includes all such devices as transformers, pre-amplifiers, or other elements that form an integral part of the microphone, up to the output terminals specified by the manufacturer. The major characteristics of a microphone are considered in Clauses 6 to 21. Additional characteristics are considered in Annex A and Annex C. IEC 60268-4:2018 cancels and replaces the fifth edition published in 2014. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
a) subclause 19.4 on "pop" measurement replaces Annex C;
b) new Annex D for noise measurements in the digital domain.