DSP中输入信号的生成过程。 conio.cpp实现X(n)信号，其中有两个频率分量的正弦信号（正弦计算由sinwn.cpp实现），频率可变，这里取140Hz和70Hz。 考虑了高斯白噪声，由gauss.cpp实现。 最后该信号共产生2000个点，最后的信号点存储于 “x.txt”文本中。-DSP input signal generation process. Conio.cpp achieve X (n) signal, in which there are two components of the frequency sinusoidal signals (sine calculation sinwn.cpp achieved), variable frequency, here and frequencies from 140Hz. Consider a Gaussian white noise from gauss.cpp achieve. Finally, the signal generated 2,000 points, the final point signal storage in the "x.txt" text.