In order to transmit sound signals more accurately and more efficiently, a novel piezoelectric bone-conduc-tion hearing aid that separates voice signals into high frequency and low frequency conduction is proposed. The hear-ing aid is actuated by both square and rectanglar vibrators, and can conduct the resulting divided high-frequency and low-frequency signals to the inner ear. Simulation analysis was conducted on design parameters of the main-piezoelec-tric vibrator,then a prototype of the piezoelectric bone-conduction hearing aid was developed, and tested, based on the results. The results indicate that the speed difference of step response between the square vibrator and the rectang-lar vibrator is about 4 ms. In the frequency response test, the sudden change of sound pressure of the rectanglar vibra-tor averages 10 dB higher than the square vibrator at medium and low frequencies. The sudden change of sound pres-sure for the square vibrator averages about 13 dB lower than the rectanglar vibrator at the medium and high frequen-cies. The experimental result confirms that the hearing aid can conduct the voice signal after frequency division.%为了使压电骨传导助听器对声音信号的传递更准确、更高效,提出一种具备对高低频声信号进行分频传导能力的新型压电骨传导助听器. 该助听器利用方形和矩形2个压电振子独立驱动,可以将高低频声音信号分频后通过骨传导方式传至内耳. 对助听器的主要部件压电振子设计参数进行了仿真分析,依据仿真分析的结果,制作了压电骨传导助听器试验样机,搭建了测试系统,对助听器样机进行了试验测试. 测试结果表明,矩形和方形振子的阶跃响应速度相差约4 ms;中低频段频率响应中矩形振子的声压值突变平均超过方形振子约10 dB,中高频段频率响应中方形振子的声压值突变平均超过矩形振子约13 dB. 试验结果证明该助听器可以实现声音信号的分频传导.
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