ISO 389-7:2019 声学 校正听力设备的基准零级 第7部分：自由场和扩散场收听条件下的基准听阈

标准编号：ISO 389-7:2019

中文名称：声学 校正听力设备的基准零级 第7部分：自由场和扩散场收听条件下的基准听阈

英文名称：Acoustics — Reference zero for the calibration of audiometric equipment — Part 7: Reference threshold of hearing under free-field and diffuse-field listening conditions

发布日期：2019-10

标准范围

本文件规定了在下列条件下校准测听设备的参考听力阈值。a） 在没有听者的情况下，声场由自由渐进平面波（自由场）或漫反射声场组成，如ISO 8253-2所规定。在自由场的情况下，声源直接位于听者前面（正面入射）。b） 在自由场条件下，声音信号是纯（正弦）音调，在漫射场条件下，声音信号是三分之一倍频带（白色或粉色）噪声。c） 在没有听者的情况下，在听者头部中心的位置测量声压级。d） 倾听是双耳的。注1:ISO 8253-2给出了自由场听力条件下的听阈校正值，以及偏离正面入射的选定声入射角（45°和90°）。注2:参考文献[1]给出了其他条件。根据ISO 266，以数字形式给出了从20 Hz到16 000 Hz（包括20 Hz到16 000 Hz）的三分之一倍频程系列中的首选频率，以及高达18 000 Hz的一些中间测听频率的数据。阈值数据不同于ISO 389-1、ISO 389-2、ISO 389-5和ISO 389-8中规定的听力零点，因为后者指的是通过耳机进行的单耳听力，声压级指的是指定的耦合器和耳模拟器。因此，直接比较上述ISO 389部分和本文件中的数据是不合适的。

This document specifies a reference threshold of hearing for the calibration of audiometric equipment used under the following conditions.a) The sound field in the absence of the listener consists of either a free progressive plane wave (free field) or a diffuse sound field, as specified in ISO 8253？2. In the case of a free field, the source of sound is directly in front of the listener (frontal incidence).b) The sound signals are pure (sinusoidal) tones in the case of free-field conditions and one-third-octave bands of (white or pink) noise in the case of diffuse-field conditions.c) The sound pressure level is measured in the absence of the listener at the position where the centre of the listener's head would be.d) Listening is binaural.NOTE 1 Correction values for the threshold of hearing under free-field listening conditions and selected angles of sound incidence (45° and 90°) deviating from frontal incidence are given in ISO 8253-2 for information.NOTE 2 Other conditions are given in Reference [1].The data are given in numerical form for the preferred frequencies in the one-third-octave series from 20 Hz to 16 000 Hz inclusive in accordance with ISO 266 and, in addition, for some intermediate audiometric frequencies up to 18 000 Hz.The threshold data differ from the audiometric zero specified in ISO 389？1, ISO 389？2, ISO 389？5 and ISO 389？8, since the latter refer to monaural listening through earphones with sound pressure levels referred to specified couplers and ear simulators. Direct comparison between the data in the parts of ISO 389 mentioned above and in this document is therefore not appropriate.

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