基于CF接口技术的诱发电位测试系统的研究

Study on the Evoked Potentials Detecting System Based on the Technology of CF Interface

本文涉及一种基于PDA等移动计算平台和CF接口技术的诱发电位测试系统的研究。这种诱发电位测试系统具备虚拟仪器结构特征，具有两个诱发信号输出通道和两个输入通道，可以输出重复频率0．01～100Hz、占空比5％～95％、幅度0-±5V并连续可调的各种函数或任意定义的诱发电信号，以50ksps的采样率实时采集诱发电位输入信号，并可以对输入信号进行模拟、数字信号处理，以满足诱发电位生理研究需要。在PDA等移动计算设备的CF接口基础上，设计出工作于I／O模式的CF＋卡，并编写出运行于Windows CE等移动操作系统平台上的设备驱动程序和数据采集、处理程序，完成诱发电信号的产生和诱发电位的采集。实践表明基于PDA等移动计算设备和CF接口技术的诱发电位测试系统的卓越的诱发信号发生和实时采集、处理诱发电位信号的能力，满足大多数诱发电位生理研究的需要。

This paper mainly refers to the system of evoked potentials detecting base on technology of mobile computing platform and CF interface. This detecting system, with the characters of virtual instruments, consists of two outputting channels and two inputting channels of evoked potentials signals. The system not only can generate all kinds of function and arbitrary evoked signals with continually adjustable repeating frequency ranging between 0.01 - 100Hz, duty cycle ratio ranging between 5% - 95% and amplitude ranging between 0 - ±5V, sample the evoked potentials signals with 50k sps in real time mode, but also can process the inputting evoked potentials signals in analog and digital status to meet the physiological research request. The CF ＋ card in I/O mode base on the mobile computing equipments and its CF interface was designed, the driver and application software on Windows CE platform were also written at the same time. The system with these hardware and software will perform the task of generating evoked signals and sampling evoked potentials signals. It is proved to be true by practice that the evoked potentials detecting system based on the mobile computing equipments and its CF interface can meet the most requirements for evoked potentials physiological researches.