Standardization of equal -loudness level characteristics

等响度特性标准化

基本信息

批准号：
02302049
负责人：
SONE Toshio
金额：
$ 1.28万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Co-operative Research (A)
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1991
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02302049/
关键词：
Equal-loudness level Equal-loudness level contours Loudness Threshold of hearing Head transfer function MAF Free field Loudness level 等ラウドネスレベル曲線

项目摘要

Hearing experiments to derive equal-loudness level contours were carried out in a large anechoic room. In the experiments, the equal-loudness level contours of pure tones at 20 phon, 40 phon and 70 phon as well as the threshold of hearing of pure tones in a free field were measured. We get the following results with the experiments.(1) The equal-loudness level contours at all the levels examined show discrepancy from the present international standard, ISO 226, by more than 10 dB in lower frequency range than 1 kHz. This means that the -present standard should be totally revised.(2) All the data of the threshold of hearing obtained were presented to TC43 of TSO (International Standardization Organization). It is decided that a new international standard ISO 226 Part 1 is to be published with other data and other data from Germany and Denmark. We contribute this standardization remarkably because only our group could present such data that covered all over the audible frequency range.(3) We found that a small peak of around 2 dB exists between 1 kHz and 2 kHz for both the equal-loudness contours and the threshold of hearing. Comparing this peak with individual head transfer functions (transfer function of a acoustic path from a sound source to the listener's external ear), we found that the peak can be explained by a corresponding dip in the head transfer functions. This shows that the head transfer functions is an important factor to determine individual equal-loudness contours and threshold of hearing.

听力实验是在大型的室内室内进行的，以得出相等的高度轮廓。在实验中，测量了在自由场中纯音调，40个Phon和70 Phon的纯音的相等级别轮廓以及听觉的阈值。我们从实验中获得以下结果。（1）在所有检查的水平上，相等的大通水平轮廓显示出与当前国际标准ISO 226的差异，在低频范围内超过10 dB，大于1 kHz。这意味着 - 应完全修订了 - 先验的标准。（2）将获得听证阈值的所有数据呈现给TSO（国际标准化组织）的TC43。决定新的国际标准ISO 226第1部分将与德国和丹麦的其他数据以及其他数据一起发布。我们非常贡献这一标准化，因为只有我们的小组才能提供在整个听觉频率范围内涵盖的数据。（3）我们发现，对于相等的大声轮廓和听证的阈值，在1 kHz和2 kHz之间存在一个约2 dB的小峰。将这个峰与单个头部传递函数进行比较（声路从声源到听众的外耳的传递函数），我们发现峰可以通过头部传递函数中的相应倾角来解释峰。这表明头部传递函数是确定个体相等的轮廓和听力阈值的重要因素。