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Self-demodulation of amplitude-modulated signal components in amplitude-modulated bone-conducted ultrasonic hearing

机译:调幅骨传导超声听力中调幅信号分量的自解调

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摘要

A novel hearing aid system utilizing amplitude-modulated bone-conducted ultrasound (AM-BCU) is being developed for use by profoundly deaf people. However, there is a lack of research on the acoustic aspects of AM-BCU hearing. In this study, acoustic fields in the ear canal under AMBCU stimulation were examined with respect to the self-demodulation effect of amplitude-modulated signal components generated in the ear canal. We found self-demodulated signals with an audible sound pressure level related to the amplitude-modulated signal components of bone-conducted ultrasonic stimulation. In addition, the increases in the self-demodulated signal levels at low frequencies in the ear canal after occluding the ear canal opening, i.e., the positive occlusion effect, indicate the existence of a pathway by which the self-demodulated signals pass through the aural cartilage and soft tissue, and radiate into the ear canal. (C) 2015 The Japan Society of Applied Physics
机译:正在开发一种利用振幅调制的骨传导超声(AM-BCU)的新型助听器系统,以供严重失聪的人使用。但是,关于AM-BCU听力的声学方面尚缺乏研究。在这项研究中,针对AMBCU刺激下耳道中的声场,对耳道中产生的调幅信号分量的自解调效应进行了研究。我们发现具有声音可听到的声压级的自解调信号与骨传导超声刺激的振幅调制信号分量有关。另外,阻塞耳道开口后,耳道中低频的自解调信号电平增加,即正阻塞效应,表明存在自解调信号通过耳道的途径。软骨和软组织,并辐射到耳道。 (C)2015年日本应用物理学会

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  • 来源
    《Japanese journal of applied physics》 |2015年第7s1期|07HF07.1-07HF07.6|共6页
  • 作者

    Ito Kazuhito; Nakagawa Seiji;

  • 作者单位

    Natl Inst Adv Ind Sci & Technol, Biomed Res Inst, Med & Biol Engn Res Grp, Ikeda, Osaka 5638577, Japan.;

    Natl Inst Adv Ind Sci & Technol, Biomed Res Inst, Med & Biol Engn Res Grp, Ikeda, Osaka 5638577, Japan.;

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