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致 谢
谨向所有指导过、帮助过我的老师和同学表示最真挚的感谢!
本文是在导师精心指导下完成的，我非常感谢导师李致金老师，从论文的选题、材料的准备到初稿的审查等，李老师都给予了我悉心的指导和无私的帮助，正是由于导师倾注了大量的精力和时间，我的论文才得以顺利的完成。四年来，给我印象最深的是李老师渊博的学识，严谨的治学态度和高尚的精神风范。他让我看到一名科技工作者所应具备的那种踏实勤恳、一丝不苟、实事求是的优良品质和工作作风。在导师门下的这段日子里，老师首先教的是如何做人，其次教的才是如何作学问。师恩浩荡，只有在今后的人生路上，我将牢记师训，努力上作。
四年的学习过程中，我还得到我院通信工程系各老师的指导和帮助，老师的点拨使我茅塞顿开，无数关键的问题能够迎刃而解，在此表示由衷的感谢!
在论文的完成过程中，还得到了众多同窗的帮助，他们在平时的学习生活中给予我许多的帮助，让我体会到学习中和睦愉快的气氛，感受到真挚的友谊，为我的大学生活留下了美好的回忆，值此论文完成之际向他们表示深深的谢意。
感谢我的父母，感谢这么多年来父母对我的培养和支持!
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Research in Speech Processing Algorithms Applied in Chinese Digitial
Hearing Aid
Caochunyan
College of Electronic & Information Engineering ,Nanjing University of Information Science & Technology , Nanjing 210044
ABSTRACT
The paper introduced the strucsture of digital hearing aid in brief firstly, then anlyzed and compared speech processing
algorithms applied in digitial hearing aid, serving respectively in speech source localization methods based on microphone arrays, adaptive beamforing and Multi-band loudness compensation .we use the spatial difference of the target speech and noise ,and then Through the spatial filter to relize the enhancement of speech signals and the suppression of non-stationary noise ,inorder to improve the patient's understanding ability. Finally ,analyse the characteristic of their remaining hearing and combine with the principles of auditory perception .this paper researches an effective scheme of multi-channel speech compensation and a frequency shift algorithms adapting to the patients whose hearing are damaged seriously.
Key word: Digital hearing aid， Microphone array， Acoustic source localization, Adaptive beam, Speech compensation
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