音响系统设备第4部分:麦克风

[中文适用范围]： 本部分IEC 60268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，并详细说明了制造商应指定的特性。 它适用于所有用于语音和音乐的音响系统麦克风。不适用于测量麦克风，但适用于具有多个音频通道的麦克风的每个音频通道，例如用于立体声或类似用途的麦克风。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、前置放大器或其他构成麦克风组成部分的元素，直至制造商指定的输出端子。 麦克风的主要特性在第6至21条中考虑。附加特性在附录A、附录C和附录D中考虑。 注：本文件中规定的特性并未完全描述麦克风的主观响应。需要进一步的工作来找到新的定义和测量程序，以便以后引入至少用于描述麦克风性能的一些主观描述的客观特性。 [外文原描述]： IEC 60268-4:2018 RLV contains both the official IEC International Standard and its Redline version. The Redline version is available in English only and provides you with a quick and easy way to compare all the changes between the official IEC Standard and its previous edition. 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.