摘要
连续交错采样(CIS)语音处理策略,是目前商用电子耳蜗较多采用的语音处理策略,具有较高的刺激速率和植入者对语音识别的准确率。详细阐述算法原理,并介绍在通用16位定点DSP TMS320VC5502实现CIS算法中,如何抑制溢出、保持算法稳定、滤波器系数最小字长确定及系数定标。实验数据运行结果表明,定点DSP实现CIS策略是有效可行的方法,为开发低成本商用电子耳蜗提供可靠依据。
Continuous interleaved sampling （CIS） speech processing strategy is widely used in current commercial cochlear implants for its high stimulation rate and high performance in speech recognition. This paper described the implementation of the strategy on 16-bit fixed-point TMS320VC5502,as well as the principle of CIS strategy. Special emphasis was placed on how to avoid the overflow, the minimum bit of the coefficients of the filters which determine the stability of the system. The findings demonstrated that the implementation of CIS strategy for cochlear implant on fixed-point commercial DSP was validated with speech samples. The results provided supporting data for the development of low-cost cochlear implant.
出处
《中国生物医学工程学报》
CAS
CSCD
北大核心
2009年第3期386-392,共7页
Chinese Journal of Biomedical Engineering
关键词
定点DSP
电子耳蜗
连续交错采样(CIS)
溢出
fixed-point DSP
cochlear implants
continuous interleaved sampling （CIS）
overflow
