摘要
现有的电子耳蜗的刺激脉冲序列的合成方案都是以固定频率和位置编码方式刺激听觉神经纤维来诱发听觉。但是,这些合成方法破坏了语音信号的时间上的相关性和相干性,均不能反映人的耳蜗对语音信号的时间编码方式。本研究提出了一种全新的刺激脉冲序列的合成方案,该方案能够在语音信号的小波变换域上的过零点处产生刺激脉冲合成脉冲序列,我们将之称为小波过零刺激方案。小波 过零刺激方案可有效地克服电极之间的相互影响,同时刺激脉冲序列的时间间隔完全由语音信号的动态特性确定,从而保证了语音信号的时间相关性和相干性。
Most of the strategies of the synthesis of stimulating pulse signal in the cochlear implants currently used are analogy to human cochlea's spatial encoding pattern,which stimulates auditory fibers in given frequencies based on the frequency characterizations of speech.However,These strategies can not simulate human cochlea's temporal encoding pattern.This paper presented a new solution,which generated stimulating pulsatile series at zero-cross points in the domain of wavelet transform,called as wavelet-zero-cross stimulation(WZS).This solution can eliminate the impacts among electrodes and keep the temporal correlation and coherence of speech remained in stimulating pulsatile series.These properties can provides the auditory neural center with the base of informatics.
出处
《中国生物医学工程学报》
CAS
CSCD
北大核心
2005年第3期374-380,共7页
Chinese Journal of Biomedical Engineering
关键词
刺激脉冲序列
小波变换
过零点
stimulating pulsatile series
wavelet transform
zero-cross points
