基于气、骨导声抵消测量气-骨导差异传递函数的研究  

Measurement of Bone to Air Differential Transfer Function Based on Bone to Air Cancellation

作　　者：唐惠芳 李晓东[1,2] 桑晋秋 TANG Huifang;LI Xiaodong;SANG Jinqiu(Institute of Acoustics,Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院声学研究所,北京100190 [2]中国科学院大学,北京100049

出　　处：《中华耳科学杂志》2019年第4期593-600,共8页Chinese Journal of Otology

基　　金：中国科学院声学研究所青年英才计划项目(No.QNYC201720,No.QNYC201813);国家自然科学基金项目(No.11504404,No.11604362,No.61571435,No.61801468)资助课题~~

摘　　要：目的近年来,骨导耳机已逐渐应用于助听领域,为了对骨导耳机输出频率响应进行有效补偿,提升骨导耳机的放音效果,有必要测量气-骨导差异传递函数(Bone to air differential transfer function,BADTF),BADTF是气导传递函数与骨导传递函数的特征差异,能够反映骨导耳机输出的声感知效果。方法本文利用气、骨导声抵消法来测量BADTF,通过调节气、骨导声的幅度差使气、骨导声达到相同的响度,进一步调节气、骨导声相位差实现耳蜗处气、骨导声最大程度抵消。结果实验在0.1 kHz8 kHz的24个频点上测量了7名听力正常者的BADTF,开展重复实验验证了该方法的可重复性,通过抵消程度测量验证了测量结果的可靠性。结论测量结果表明,测量到的BADTF曲线虽有明显的个性化差异,但存在相似的包络和共同峰值,能够反映气、骨导声传递系统的电声和生理特征差异,BADTF的幅频特性和相频特性对于骨导耳机的频响修正,啸叫抑制等问题均具有重要指导意义。Objective The bone conduction(BC)headphone is gradually being applied in the field of hearingaids.For the purpose of improving reproduction performance of the BC headphone,it is necessary to measure the boneto air differential transfer function(BADTF)to compensate the output frequency response of the BC headphone.BADTF is the difference between the BC transfer function and the air conduction(AC)transfer function and it can reflectcochlear perception of the BC headphone output.Methods In this thesis,bone to air cancellation was measured todetermine the BADTF:i.e.the AC/BC sound amplitude differential was adjusted until AC loudness equaled BC loudness,followed by adjustment of AC/BC phase difference until maximum cancellation was achieved.Using this protocol,the BADTF was determined in 7 subjects at 24 frequencies ranging from 0.1 to 8 kHz.Test repeatability and reliabilitywere also verified through multiple measurements including repeated cancellation measurements.Results Despitenoticeable inter-individual variations,similar envelopes and peaks in the BADTF curve were demonstrated.ConclusionOur technique can be used to reveal the electroacoustic and the physiologic characteristics between different ACand BC transmission systems.The amplitude-frequency and phase-frequency information in the BADTF measured isimportant for guiding frequency response compensation as well as squeak suppression in a BC headphone.

关 键 词：气骨导差异 气骨导声抵消 骨传导 

分 类 号：R764[医药卫生—耳鼻咽喉科]