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1050320050361目录1概述..................................................................................................................................................11.1课题研究背景.....................................................................11.2课题研究意义.....................................................................12芯片介绍...........................................................................................................................................12.110116...........................................................................12.274HC04..........................................................................12.374HC14..........................................................................22.474HC74..........................................................................22.574HC164.........................................................................22.674HC145.........................................................................42.7AT89C2051.......................................................................42.8562.............................................................................63系统基本原理....................................................................................................................................63.1频率计定义......................................................................63.2系统的组成......................................................................63.3处理方法........................................................................74系统硬件设计....................................................................................................................................74.1信号预处理......................................................................74.1.1滤波、衰减、补偿............................................................74.1.2放大电路....................................................................74.2波形转换电路....................................................................84.3波形整形及分频电路.....................
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