里面包含FIR的源程序，在DSP中可以运行，我自己测试过，主要是两个函数，一个是正弦一个是余弦函数，高频是余弦，低频是正弦。滤波后只剩下正弦了。-Which contains the source of the FIR, the DSP can run, I tested mainly two functions, a sinusoidal one Cosine function, high-frequency cosine, low-frequency sine. Filtering on