基于微控制器的听觉假体接收器刺激器

K.R. Kumar, P. Ramaiah
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引用次数: 6

摘要

听觉假体(AP)是一种电子设备,旨在为重度失聪的人提供听觉感觉。AP通过电流刺激听觉神经,使听障人士能够理解讲话,从而模仿正常的听力操作。AP系统由两个功能单元组成,即体戴式语音处理器(BWSP)和接收器刺激器。实验室模型BWSP可用。基于高速单片机DS89C420的语音解码器、DAC、ADC、恒流刺激器、编码器、通道选择组合电路、开关矩阵和模拟电阻阵列组成了听觉修复器(RSAP)的原型模型。使用实验室模型语音处理器实现基于音频信息生成刺激所需信息的连续交错采样(CIS)语音处理算法。语音解码器通过射频经皮接收来自语音处理器的编码语音数据。介绍了基于CIS刺激策略的语音数据格式和双相刺激脉冲的生成。将模拟成电阻阵列的8电极多通道听觉假体原型驱动,测试其性能。利用实验室模型体戴式语音处理器生成的语音样本测试数据,验证了CIS算法的实现方面。利用听觉假体的原型模型和模拟电极电阻阵列,结合高速数据采集系统,取得了满意的结果。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Microcontroller based receiver stimulator for auditory prosthesis
The Auditory Prosthesis (AP) is an electronic device that is designed to provide hearing sensations to people who are profoundly deaf. The AP mimics the normal hearing operation by stimulating the auditory nerve with an electric current allowing the hearing impaired persons to understand the speech. The AP system consists of two functional units namely Body Worn Speech Processor (BWSP) and Receiver Stimulator. The laboratory model BWSP is available. The prototype model Receiver Stimulator for Auditory Prosthesis(RSAP) consists of High-speed Microcontroller DS89C420 based Speech Decoder, DAC, ADC, constant current stimulator, encoder, combinational circuit for channel selection, switch matrix and simulated resistance array. The laboratory model speech processor is used to implement the Continuous Interleaved Sampling (CIS) speech processing algorithm which generates the information required for stimulation based on the audio information. Speech Decoder receives the encoded speech data via RF transcutaneous from speech processor. The speech data format and generation of biphasic stimulation pulses based on the CIS stimulation strategy are covered. Multi-channel auditory Prosthesis with eight electrodes that are simulated as resistance array can be driven by the prototype auditory Prosthesis for testing its performance. The implementation aspects of CIS algorithm are validated using the test data of speech samples generated by the laboratory model Body worn speech processor. The results are presented using prototype model of auditory Prosthesis and simulated electrode resistance array with a high-speed data acquisition system and found satisfactory results.
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