IEC 60268-24:20 23适用于主动声学降噪耳机和耳机，其具有通过环境噪声检测麦克风和降噪信号处理电路产生的换能器的输出声音来降低用户听到的噪声的功能。 本文件规定了这类耳机或耳机的术语和定义、需要规定的特性以及测量和评估方法。 一个或多个噪声检测麦克风安装在耳机或耳机的主体中、表面上或附件上。信号处理电路是模拟和数字电子电路。 本文件不涉及用于听力保护的设备。 噪声消除特性测量方法可以应用于不具有主动噪声消除功能的头戴式耳机和耳机。

IEC 60268-24:2023 is applicable to active acoustic noise-cancelling headphones and earphones which have the function of reducing the noise heard by the user by the output sound from the transducer generated by the environment noise detection microphone and the noise reduction signal processing circuit.
This document specifies the terms and definitions of this type of headphones or earphones, the characteristics to be specified, and the measurement and evaluation methods.
The noise detection microphone or microphones are mounted in the body, on the surface, or on an accessory of the headphones or earphones. Signal processing circuits are analogue and digital electronic circuits.
This document does not deal with equipment intended for hearing protection.
The noise cancelling characteristic measurement methods can be applied to headphones and earphones having no active noise cancelling function.