基于DSP的电子耳蜗语音编码及无线传输

DSP-based speech encoding and transmission for the Cochlea Implant

在电子耳蜗设计中,语音信号的实时有效编码及传输是其中的关键技术。本文根据耳蜗的空间位置编码原理,设计了一套电子耳蜗语音处理软硬件系统,以数字信号处理器(Digital signal processor,DSP)芯片为其硬件核心,实现了采集语音信号并采用连续交替取样(Continuous Interleaved Sampling,CIS)语音处理方案,并使用CVSD(Continuously Variable Slope Delta Modulation)编码压缩码率,并通过无线芯片nRF2401A进行无线传输。初步实验结果表明:本文所设计的方案能够有效地将语音信号转变为电子耳蜗所需的信号,并进行有效的传送。

In the design of the Cochlea Implant, the real-time speech processing and coding effectively is the pivotal technology. Due to the location coding principle, this paper proposed a flexible scheme of hardware and software on speech processing system for Cochlear Implant. In this design, DSPs as a hardware＇s core has been used for speech signal acquisition, processing under CIS （Continuous Interleaved Sampling） principle, CVSD coding （Continuously Variable Slope Delta Modulation）, and then. transmitted wire- less via nRF2401A module. Preliminary experiments validated that the proposed system could effectively convert the speech to the signals required by Cochlear Implant with the wireless transmission scheme efficiently.