文章摘要
薛明富,胡爱群.非线性助听器选配算法声学特性研究与仿真[J].声学技术,2011,(3):259~269
非线性助听器选配算法声学特性研究与仿真
Fitting methods for non-linear hearing aids—the study and simulation of acoustic characteristics
投稿时间:2010-09-02  修订日期:2010-12-12
DOI:
中文关键词: 非线性助听器  设计原则  NAL-NL1  DSL[i/o]5.0  声学响应特性  响度和语音清晰度
英文关键词: non-linear hearing aids  design principles  NAL-NL1  DSL5.0  acoustic response characteristics  loud-ness & speech intelligibility
基金项目:
作者单位E-mail
薛明富 东南大学信息科学与工程学院, 南京210096 mingfu.xue@gmail.com 
胡爱群 东南大学信息科学与工程学院, 南京210096  
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中文摘要:
      虽然非线性助听器选配算法相继被提出,但对各选配算法的研究并不充分.对常用的NAL-NL1和DSL[i/o]5.0等选配算法进行了研究与仿真.首先研究了各选配算法的设计原则,并仿真分析了在各种典型听力图下,各算法所给出的声学响应特性(增益、拐点、压缩比、各频段的强调程度等),计算了客观的评价指标(响度、语音清晰度等).实验证实,NAL-NL1的原则是对语言的所有频率带整体进行响度均衡化,并且最大化语言清晰度,NAL系列算法均与此类似,而DSL[i/o]5.0的原则是响度正常化.对同样的听力图,由于设计原则与理念的不同,各算法给出了不同的响应特性,在响度和语音清晰度上也有所差异,讨论了设计原则对响应特性的影响及其对应关系.还对非线性助听器选配算法的研究现状和未来发展方向进行了一定的探讨.
英文摘要:
      Various fitting methods for non-linear hearing aids have been proposed.But the study of these fitting methods is not sufficient,and no such work has been done in China.This paper gives the study and the simulation of common fitting methods for non-linear hearing aids,such as NAL-NL1 and DSL5.0.First,it studies the design principles of these fitting methods.Then,it simulates and analysis the acoustic response characteristics of fitting methods under various typical audiograms,such as gain,knee points,compression ratio and the degree of emphasis in different frequency bands.It calculates the objective assessment indexes like loudness and speech intelligibility.Experiments have confirmed that the principle of NAL-NL1 is to get loudness equalization among all frequency bands,and maximize the speech intelligibility.NAL series of fitting methods are similar to this while the DSL5.0 focuses on loudness normalization.Under the same audiogram,they give different acoustic response characteristics due to the differences of design principles and concepts.They also get different loudness and speech intelligibility.This paper discusses the impacts of design principles on the response characteristics and the interrelation between them.This paper also investi-gates the research status and the future developing directions of the non-linear fitting methods.
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