音响系统设备 第7部分：耳机和耳塞机

[中文适用范围]： IEC 60268-7:2025适用于拟用于人耳内或耳上的耳机、耳塞、耳机套装及耳机组件。该标准也适用于构成耳机系统不可分割部分的设备，如前置放大器、无源网络和电源。本文件不涉及以下内容：- 安全方面，相关内容可参考IEC 62368-1或其他适用标准；- 耳机麦克风的特性，相关内容可参考IEC 60268-4；- 助听器使用的耳塞或其他设备，相关内容可参考IEC 60118-0；- 用于听力测试的耳机；- 虽然本文件中的某些规定可能适用，但用于主动耳保护系统的耳机及其他设备；- 由IEC 60268-24所涵盖的主动降噪特性。本文件规定了制造商在产品规格中所包含的特性及其相关的测量方法。它包括对不同类型耳机的分类，主要依据换能器与耳朵之间声学耦合的方式，并提供可用于标识的分类代码。本文件中制造商提供的额定条件和特性一般不用于外部验证。额定特性的测量方法为信息性内容，目的是为制造商提供可重复测试和数据对比的参考。所有其他规格和测试内容均用于制造商内部测试及外部测试与验证。本第四版取消并替代了2010年出版的第三版及2020年的第1号修正案。本版为技术修订版。与前一版相比，本版包括以下重大技术变更：- 与IEC 60268-7:2010/AMD1:2020合并；- 条款/子条款/附录重构和重新编号；- 增加了自由场/扩散场补偿频率响应的有效频率范围；- 更新了调制失真和差频失真测量方法；- 增加了双音失真测量的详细内容，见附录I；- 增加了立体声耳机左右跟踪响应的详细内容，见附录J。 [外文原描述]： IEC 60268-7:2025 is applicable to headphones, earphones, headsets and earsets, intended to be used on, or in, the human ear. It also applies to equipment, such as pre-amplifiers, passive networks and power supplies which form an integral part of the headphone system. This document does not deal with: - safety, for which reference is made to IEC 62368-1 or another appropriate standard; - the characteristics of microphones of headsets, for which reference is made to IEC 60268‑4; - earphones and other devices for hearing aids, for which reference is made to IEC 60118-0; - headphones for audiometry; - headphones and other devices which form part of an active ear-defender system, although some of the provisions of this document can be applicable; - active noise cancelation characteristics as covered by IEC 60268-24. This document specifies the characteristics which are included by the manufacturer in specifications, and relevant methods of measurement. It includes a classification of the different types of earphones, mainly characterized by the way in which the transducer is coupled acoustically to the ear, and a classification code which can also be used for marking. Rated conditions and characteristics in this document provided by the manufacturer are not generally intended for external verification. Measurement methods for rated characteristics are informative and are provided for the benefit of manufacturers for the purpose of test repeatability and data comparison. All other specifications and tests are provided for testing by the manufacturer and for external testing and verification. This fourth edition cancels and replaces the third edition published in 2010, and Amendment 1 of 2020. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: - consolidated with IEC 60268-7:2010/AMD1:2020; - clause/subclause/annex reconstruction and renumbering; - addition of effective frequency range of the free-field / diffuse-field compensated frequency response; - update of measurement methods of modulation distortion and difference-frequency distortion; - addition of details of two-tone distortion measurements, see Annex I; - addition of details of left-right tracking response for stereo headphones, see Annex J.