基于98C51单片机的秒表小程序，采用终端形式计算进入终端的时间，从而实现计时的功能。-Based on 98C51 microcontroller stopwatch small programs using the terminal into the terminal form of computing time, in order to achieve timing functions.

采用FFT计算连续时间Fourier变换。输出幅频谱数据对(f,AW)-FFT calculation using the continuous-time Fourier transform. The output data rate spectrum (f, AW)