本文選題：助聽(tīng)器 + 聲源定位��； 參考：《華北電力大學(xué)(北京)》2017年碩士論文

【摘要】：助聽(tīng)器是一種能夠有效地治療人耳聽(tīng)力損失的醫(yī)療設(shè)備,在解決補(bǔ)償人耳聽(tīng)力方面可以起到很大的作用。助聽(tīng)器在開(kāi)發(fā)技術(shù)上不斷創(chuàng)新,各種數(shù)字化、智能化、并具有聲源定位功能的產(chǎn)品不斷上市,助聽(tīng)器的聲源定位性能直接影響著使用者對(duì)聲音方位的辨識(shí)度,甚至影響使用者的聽(tīng)力健康,因此,人們一直在研究人類(lèi)的聽(tīng)覺(jué)系統(tǒng),希望可以幫助有聽(tīng)力障礙的人們。其中,有一項(xiàng)關(guān)鍵技術(shù)為雙耳聲源定位技術(shù)。為了更好的幫助聽(tīng)障人群選擇性能優(yōu)質(zhì)且適合自身的助聽(tīng)器,我們需要對(duì)助聽(tīng)器聲源定位性能建立一套完整的評(píng)價(jià)方案。本文通過(guò)改進(jìn)已有聲源定位的客觀評(píng)價(jià)算法,提出了一個(gè)針對(duì)于檢測(cè)助聽(tīng)器聲源定位性能的評(píng)價(jià)方案。該方案包括音頻采集模塊、算法改進(jìn)模塊及指標(biāo)計(jì)算模塊共同實(shí)現(xiàn),并通過(guò)實(shí)驗(yàn)驗(yàn)證,該方法能有效的評(píng)價(jià)助聽(tīng)器聲源定位功能。論文的主要研究工作有以下四個(gè)方面:(1)研究了雙耳聽(tīng)覺(jué)的定位線索和頭相關(guān)傳遞函數(shù)(HRTF)兩部分。定位線索主要為雙耳時(shí)間差(ITD)和雙耳歸度差(ILD),在本文實(shí)驗(yàn)中主要根據(jù)ITD進(jìn)行聲源定位,并附帶使用ILD檢測(cè)聲源定位趨勢(shì)。并通過(guò)MIT實(shí)驗(yàn)室的HRTF數(shù)據(jù)庫(kù)計(jì)算出定位結(jié)果。(2)搭建實(shí)驗(yàn)系統(tǒng),實(shí)驗(yàn)采用標(biāo)準(zhǔn)純音和中文語(yǔ)音,純音按三分之一倍頻程從200Hz到6300Hz共16個(gè)頻率段,每個(gè)音頻10s;中文語(yǔ)音音頻60s;采用圓形聲源陣列,通過(guò)各個(gè)角度的音箱來(lái)模擬現(xiàn)實(shí)生活中聲源從不同方位發(fā)出的情形;基于MATLAB實(shí)現(xiàn)當(dāng)前指標(biāo)的計(jì)算過(guò)程。(3)在助聽(tīng)器領(lǐng)域中,現(xiàn)有算法存在著缺陷,而且考慮到雙耳信號(hào)微小相位差的問(wèn)題。我們?cè)诂F(xiàn)有算法的基礎(chǔ)上進(jìn)行了改進(jìn),最后通過(guò)實(shí)驗(yàn)驗(yàn)證改進(jìn)后的算法檢測(cè)有效,精確度高。(4)選取同品牌高、中、低檔助聽(tīng)器作為被測(cè)樣本,利用搭建好的實(shí)驗(yàn)平臺(tái),按本文提出的方法做客觀對(duì)比實(shí)驗(yàn),經(jīng)實(shí)驗(yàn)驗(yàn)證,該方案計(jì)算所得的指標(biāo)趨勢(shì)與助聽(tīng)器價(jià)位一致,從而驗(yàn)證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.
【學(xué)位授予單位】：華北電力大學(xué)(北京)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：R764.5;TN912.3

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