电声学测听设备第1部分:纯音和语音测听设备

[中文适用范围]： 本部分 IEC 60645 规定了用于确定相对于通过心理声学测试方法建立的标准参考阈值水平的听力阈值水平的听力计的一般要求，以及设计用于执行使用语音材料的心理声学测试的纯音听力计的特定要求。本标准的目的是确保： a) 在频率范围 125 Hz 至 16 kHz 内对给定人耳进行的听力测试，使用符合本标准的不同纯音听力计应基本给出相同的结果； b) 所获得的结果代表测试耳的听力与参考听力阈值之间的有效比较； c) 提供了一种以标准化方式向受试者呈现语音材料的手段。这将确保使用特定语音信号和特定信号呈现方式进行的听力测试，在使用符合本标准的不同听力计时，基本给出相同的结果； d) 根据听力计生成的测试信号范围、操作模式或它们测试的听觉功能范围的复杂性，对听力计进行分类。 [外文原描述]： IEC 60645-1:2017 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 60645-1:2017 specifies general requirements for audiometers designed for use in determining hearing threshold levels, relative to standard reference threshold levels established by means of psychoacoustic test methods, and those designed to perform psychoacoustic tests using speech material. The object of this standard is to ensure: a) that tests of hearing in the frequency range 125 Hz to 16 kHz on a given human ear, performed with different pure-tone audiometers which comply with this standard, give substantially the same results; b) that the results obtained represent a valid comparison between the hearing of the ear tested and the reference threshold of hearing; c) that a means of presenting speech material to a subject in a standardized manner is provided. This will ensure that tests of hearing using a specific speech signal and a specific manner of signal presentation, when performed with different audiometers which comply with this standard, give substantially the same results; d) that audiometers are classified according to the range of test signals they present, according to the mode of operation or according to their presumed primary application. This fourth edition cancels and replaces the third edition, published in 2012, and the first edition IEC 60645-2, published in 1993. This edition constitutes a technical revision. This edition now includes the requirements for both pure-tone (prior edition of IEC 60645-1) and speech audiometers (prior edition of IEC 60645-2) into a single document. The technical requirements in this edition remain similar to the intent of the prior two documents, but now eliminate technical and editorial contradictions caused by two separate standards with different review cycles applying to an audiometer.