助听器声源定位能力的客观评价方法研究

发布时间：2018-07-03 15:48

本文选题：助听器 + 声源定位　；参考：《华北电力大学(北京)》2017年硕士论文

【摘要】：助听器是一种能够有效地治疗人耳听力损失的医疗设备,在解决补偿人耳听力方面可以起到很大的作用。助听器在开发技术上不断创新,各种数字化、智能化、并具有声源定位功能的产品不断上市,助听器的声源定位性能直接影响着使用者对声音方位的辨识度,甚至影响使用者的听力健康,因此,人们一直在研究人类的听觉系统,希望可以帮助有听力障碍的人们。其中,有一项关键技术为双耳声源定位技术。为了更好的帮助听障人群选择性能优质且适合自身的助听器,我们需要对助听器声源定位性能建立一套完整的评价方案。本文通过改进已有声源定位的客观评价算法,提出了一个针对于检测助听器声源定位性能的评价方案。该方案包括音频采集模块、算法改进模块及指标计算模块共同实现,并通过实验验证,该方法能有效的评价助听器声源定位功能。论文的主要研究工作有以下四个方面:(1)研究了双耳听觉的定位线索和头相关传递函数(HRTF)两部分。定位线索主要为双耳时间差(ITD)和双耳归度差(ILD),在本文实验中主要根据ITD进行声源定位,并附带使用ILD检测声源定位趋势。并通过MIT实验室的HRTF数据库计算出定位结果。(2)搭建实验系统,实验采用标准纯音和中文语音,纯音按三分之一倍频程从200Hz到6300Hz共16个频率段,每个音频10s;中文语音音频60s;采用圆形声源阵列,通过各个角度的音箱来模拟现实生活中声源从不同方位发出的情形;基于MATLAB实现当前指标的计算过程。(3)在助听器领域中,现有算法存在着缺陷,而且考虑到双耳信号微小相位差的问题。我们在现有算法的基础上进行了改进,最后通过实验验证改进后的算法检测有效,精确度高。(4)选取同品牌高、中、低档助听器作为被测样本,利用搭建好的实验平台,按本文提出的方法做客观对比实验,经实验验证,该方案计算所得的指标趋势与助听器价位一致,从而验证文中提出方案有效可行。
[Abstract]:Hearing aid is a kind of medical device which can effectively treat human ear hearing loss, which can play a great role in solving the problem of compensation for human ear hearing loss. In the development technology of hearing aid, various kinds of digital, intelligent, and sound source location function products are constantly on the market. The sound source location performance of hearing aid directly affects the user's recognition degree of sound orientation. Therefore, people have been studying the human auditory system, hoping to help people with hearing impairment. One of the key technologies is binaural sound source location. In order to help the hearing-impaired people to choose the hearing aid with excellent performance and suitable for their own, we need to establish a complete evaluation scheme for the location performance of the hearing aid source. In this paper, by improving the objective evaluation algorithm of sound source location, an evaluation scheme is proposed to detect the localization performance of hearing aid. The scheme includes audio acquisition module, algorithm improvement module and index calculation module. The experimental results show that the method can effectively evaluate the location function of hearing aid sound source. The main work of this paper is as follows: (1) the localization cues and the head correlation transfer function (HRTF) of binaural hearing are studied. The main clues of localization are binaural time difference (ITD) and binaural homing difference (ILD). In this experiment, acoustic source location is mainly based on ITD, and ILD is used to detect the trend of sound source location. The location results are calculated by HRTF database in MIT laboratory. (2) the experimental system is constructed. The experiment adopts standard pure tone and Chinese voice. The pure tone has 16 frequency bands from 200Hz to 6300Hz according to the frequency doubling distance of 1/3 Hz. Each audio frequency 10s; Chinese speech audio 60s; using circular sound source array, through various angles of speakers to simulate the real life of sound sources from different directions; based on MATLAB to achieve the current target calculation process. (3) in the field of hearing aids, The existing algorithms have defects and take into account the small phase difference of binaural signals. Based on the existing algorithms, we improve the algorithm. Finally, the improved algorithm is proved to be effective and accurate through experiments. (4) selecting the same brand high, middle and low hearing aids as the tested samples, using the established experimental platform, An objective contrast experiment is made according to the method proposed in this paper. The experimental results show that the calculated index trend of the scheme is the same as the price of hearing aid, thus validating the effectiveness and feasibility of the proposed scheme.
【学位授予单位】：华北电力大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：R764.5;TN912.3

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