Study in the Selection of Optimum Hearing Aids with the Computer and the Practical Application of the Method in the Educational Field

建立了当今常用助听器数据库。检索项为：频率响应的编码类型、最大功率输出和最大增益。根据患者的听力阈值水平数据，测试了几种选择最佳助听器的标准，最终采用了“言语水平法”。语音电平法是选择频率响应和增益，使平均语音频谱电平达到患者最舒适的水平。然而，在我们的程序中，引入了几个新的修改。(1)根据患者听力水平的严重程度，逐步提高作为放大目标的言语水平。(2)选择助听器时频率的权重根据患者的损伤程度进行调整。对于严重受损的人来说，低频区域的权重更大。我们检查助听器是否合适的方法也来源于这项研究。对几个声源进行了检测，结果采用了带噪声。并以日语语音谱作为助听器配配的放大指标。该计划实际上适用于聋哑学校和重听班级的学生。结果相当不错，因此大多数学生表示比以前使用助听器更满意。在配戴助听器后，频率响应几乎没有改变，尽管在应用其他选择标准时需要进行一些修改。现在我们可以满足实际教育领域对助听器的配装需求。

A data-base for hearing aids frequently used today was constructed. The items for retrieval are: the coded type of frequency response, maximum power output and maximum gain.Several criterion for selecting the optimum hearing aid, based on the data of hearing threshold level of the patient, were tested and finally the "speech level method" was adopted. The speech level method is to select the frequency response and gain that bring the mean speech spectrum level to the most comfortable level of the patient. However, in our program, several new modification were introduced.(1) The speech level as the target of amplification is gradually raised according to the severeness of the hearing level of the patient.(2) The weight of the frequency when a hearing aid is selected is adjusted to the severeness of the impairment of the patient. This is done by the low frequency region being more heavily weighted for the severely-impiared person.Our method for checking the suitability of the hearing aid fitted was also derived from this study. Several sound sources for checking were examined and band-noise was adopted as a result. Also the speech spectrum of Japanese was measured as the target of the amplification for fitting hearing aids.The program was actually applied to pupils enrolled in the schools for the deaf and the classes for the hard of hearing. The result was fairly good so that most of the pupils expressed more satisfication than with their previous hearing aid. There was almost no modification of the frequency response after fitting of the hearing aids, though several modifications were needed when the other selection criteria were applied.Now we can meet the demands of fitting the hearing aid in the actual educational field.