基于连续交替采样的电子耳蜗等间隔多刺激算法研究

摘要

At present,continuous interleaved sampling algorithm is the basic algorithm architecture for ordinary speech processing strategies in cochlear implant.The algorithm uses filter bank to divide signal to sub frequency bands,corresponding to stimulating electrodes.During a fixed time,only one electrode is working and stimulating the auditory nerves for reducing the mutual interference between electrodes.The continuous interleaved stimulating method has important application prospect for it can provide a continuous equal-interval stimulating mode,which is advantageous in increasing stimulating signal information and avoiding the current interference between adjacent electrodes.Herein we research the algorithm frame of continuous interleaved sampling-based multiple equal-interval stimulation algorithm,put forward its engineering realization and further analyze its algorithm features and parameter characteristics in order to provide the basis of further application research of multiple stimulating algorithm in cochlear implant.Meanwhile,the mismatch analysis used in this research is helpful for the stimulation mode selection in engineering realization.The proposed multiple equal-interval stimulation algorithm provides a practical method for engineering realization.%电子耳蜗连续交替采样算法是目前常见于各种电子耳蜗言语处理策略的基本算法架构,该算法通过滤波器组信号进行频带划分并与刺激电极对应,在刺激听觉神经的特定一个时刻只有一个电极在工作,目的是减少电极间刺激电流的互相干扰.由连续交替单刺激的方法可以延伸为连续等间隔交替多刺激的模式,通过该方式在增加刺激信号信息的同时避免了相邻电极同时刺激听神经而产生的刺激电流串扰,具有较大的应用前景.本文深入研究了基于连续交替采样的等间隔多刺激策略的算法架构,提出了等间隔多刺激的算法具体工程实现方式,并进一步分析了等间隔多刺激算法的特征和参数特性,为多刺激模式的算法应用研究提供了基础,同时,本文的失配分析有助于工程上刺激模式的选取,所提出的等间隔多刺激的算法模式则为算法的工程实现提供了具体方案.