基于全相位滤波器的改进人工耳蜗CIS言语处理方案

The improvement of the cochlear implantation CIS speech processing method based on the all phase DFT filter

人工耳蜗是帮助深度耳聋患者恢复听力的一种装置.利用电子耳蜗电刺激的简化模型,采用滤波特性更佳的新型全相位数字滤波器对人工耳蜗连续相间采样(continuous interleaved sampler,CIS)语音信号处理方案进行仿真及声音合成,来模拟耳蜗植入者所听到的声音,并与传统的巴特沃夫滤波器仿真方案结果相比较.仿真实验结果表明:采用全相位滤波器得到的合成语音更为清晰,噪音有所减弱,优于巴特沃夫滤波器设计所得到的结果.

Cochlear implantation is a new technology to restore the hearing ability for deaf people. A new type of digital filter with better filtrating ability, that is an all phase DFT filter, was introduced to simulate cochlear implantation CIS speech processing and to synthesize the voice, using the simple model of electrode excitation cochlear implant. By doing this, the voice can be simulated for the person with a cochlear implant. Compari- sons between this model and the traditional Butterworth filter were made. The results of the experiment show that the synthesized speech spectra by the all phase DFT digital filter is closer to the original speech spectra, and is much better than the results of the Butterworth filter.