ISO 389-7:2005 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 389-7:2005

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：2005-11

标准范围

ISO 389-7:20 05规定了用于校准在以下条件下使用的测听设备的听力参考阈值。如ISO 8253-2中所规定的，在没有听者的情况下，声场由自由渐进平面波（自由场）或扩散声场组成。在自由场的情况下，声源在听者的正前方（正面入射）。在自由场条件的情况下，声音信号是纯（正弦）音调，在扩散场条件的情况下，声音信号是（白色或粉色）噪声的三分之一倍频程带。在听者不在的情况下，在听者头部中心所在的位置测量声压级。倾听是双耳的。ISO 389-7:20 05中的数据以数字形式给出了一个-根据ISO 266，从20 Hz到16 000 Hz的第三倍频程系列，此外，对于高达18 000 Hz的一些中间测听频率。阈值数据不同于ISO 389-1、ISO 389-2、ISO/TR 389-5和ISO 389-8中规定的测听零点，因为后者是指通过耳机进行单耳聆听，声压级参考指定的耦合器和耳朵模拟器。因此，上述ISO 389部分的数据与ISO 389-7:20 05中的数据之间的直接比较是不合适的。

ISO 389-7:2005 specifies a reference threshold of hearing for the calibration of audiometric equipment used under the following conditions.

1. 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).
2. 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.
3. 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.
4. Listening is binaural.

The data in ISO 389-7:2005 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/TR 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 that in ISO 389-7:2005 is therefore not appropriate.

标准预览图