基于OMAP-L137的电子耳蜗体外语音处理器的设计

Design of the External Speech Processor of Cochlear Implant Based on OMAP-L137

电子耳蜗是目前唯一能使重度聋和全聋患者恢复听觉的医学装置,研制价格适中、基于汉语特征的电子耳蜗产品具有较高的经济效益和深远的社会意义。本文以新型DSP+ARM双核低功耗处理器OMAP-L137为核心,设计并实现了一款电子耳蜗体外语音处理器原型,包括核心处理器单元、音频单元、SDRAM、NAND Flash、USB2.0 OTG接口、无线发射接口等模块。它实现了语音实时采集、连续交替采样算法处理,并根据刺激模式形成相应的刺激脉冲参数帧序列,发送到无线传输模块。通过对本系统和电子耳蜗无线传输模块、刺激电路进行联合调试,对语音采集、算法处理以及无线发射接口进行了验证,测试结果表明系统达到设计要求。

Cochlear implant is the only approved clinical device, which is used to produce hearing sensations to a person with severe and profound nerve deafness. On account of the affordability of a common Chinese family and the special characteristics of Mandarin, it is essential to develop a kind of cochlear implant with higher quality and lower cost for Chinese people. This paper designed and implemented a prototype platform of the external speech processor for cochlear implant based on DSP and ARM dual core low-power processor OMAP- L137, which included processor OTG interface, wireless transmission interface, etc. core unit, audio eodec, SDRAM, NAND Flash, USB2.0 It can execute speech sampling in real time, apply CIS speech processing algorithm and then send the processed stimulating pulse informati9n sequence to the wireless transmission module. The test result with wireless transmission module and stimulating circuit suggested that the proposed platform reached the requirements of an external speech processor for cochlear implant in speech sampling, speech processing and wireless transmission interface.