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Study of evaluating and measuring method of impact sound.

冲击声评价与测量方法的研究。

基本信息

批准号：
60300003
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：
1985
资助国家：
日本
起止时间：
1985 至 1986
项目状态：
已结题

项目摘要

Impact sounds are such sound that are characterized by their high peak levels and short duration time. Thus, it is not appropriate to evaluate and to measure the loudness and the noisiness of impact sounds by conventional methods. We have studied how to evaluate the impact sounds in cooperation with ten laboratories in Japan by Grant-in-aid for Co-operative Research. As the first stage, a round robin test, in which all the participants conduct the same experiments under very similar listening condition, was carried out. In this test, we used repeated impact sounds which are generated by a mini-computer. The stimuli synthesized by a computer were recorded on magnetic tapes by using PCM. Then the tapes were distributed among researchers. This round robin test becomes a very large experiment where the number of the subjects were more than a hundred. The experimental results obtained by the test were as follows:(1) If we express a repeated impact sound in terms of the unweighted sound exposure level, the loudness of the impact sound show rather high relation coefficient(0.97). However, to evaluate the loudness more precisely, we have to consider some time constant which is consider to represent the integral characteristic of our hearing system.(2) As a result of the experiment for noisiness evaluation, the unweighted sound pressure level showed a very high relation coefficient(0.99). This means that this measure is quite effective to evaluate the noisiness of the repeated impact sounds.

撞击声是指峰值高、持续时间短的声音。因此，用传统的方法来评价和测量撞击声的响度和噪声是不合适的。我们在合作研究资助项目中与日本10个实验室合作，研究了如何评价冲击声。作为第一阶段，进行了一轮循环测试，所有参与者在非常相似的听力条件下进行相同的实验。在这次测试中，我们使用了由一台小型计算机产生的重复撞击声。用PCM技术将计算机合成的刺激记录在磁带上。然后将磁带分发给研究人员。这个循环测试变成了一个非常大的实验，实验对象的数量超过了一百。试验得到的实验结果如下：(1)如果用未加权的声暴露级来表示重复的撞击声，则撞击声的响度具有较高的相关系数（0.97）。然而，为了更精确地评估响度，我们必须考虑一些时间常数，它被认为是代表我们听觉系统的整体特性。(2)噪声评价实验结果表明，未加权声压级具有很高的相关系数（0.99）。这意味着该方法对于评价重复撞击声的噪声是非常有效的。