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针对电子耳蜗音调信息感知差的问题,在多导电子耳蜗机理模型的基础上,利用零(或全)相位滤波器以及希尔伯特变换,提取并分解16个通道信号的包络和精细结构,用多种方式嵌合成声音,对正常人耳测听合成音的音调信息,以确定信号的包络和精细结构对音调感知的影响。测试结果表明:精细结构相对包络对音调感知起着更重要的作用,且该作用主要表现在低频段(约1.2 kHz以内)通道上。研究发现,在固定通道上,精细结构与通道中心频率和相位信息决定的包络出现时刻对应,其音调感知与低通道电极刺激的脉冲发放时间有关。研究结论:在低频段电极上增加刺激脉冲发放时刻的控制对提高电子耳蜗音调感知是重要的,同时应注意滤波器的相位保真。
Aiming at the problem of poor perception of electronic cochlear pitch information, based on the model of multi-conduction cochlear implant, zero (or all) phase filters and Hilbert transform are used to extract and decompose the envelope and fine structure of 16 channels , Chimeric into sound in a variety of ways, listening to the tone information of the synthesized sound to normal human ears to determine the effect of signal envelope and fine structure on tone perception. The test results show that the relative envelope of the fine structure plays a more important role in the pitch perception, and the effect is mainly manifested in the low frequency band (within about 1.2 kHz). The study found that on a fixed channel, the fine structure corresponds to the moment of envelope determined by channel center frequency and phase information, and its pitch perception is related to the pulse release time of low-channel electrode stimulation. CONCLUSIONS: Increasing the timing of stimulus pulse delivery on low frequency electrodes is important to improve the perception of electronic cochlear tone, and the phase fidelity of the filter should be noted.