代码用两种方法设计了一个基于多相滤波的内插器，低通滤波器采用128阶凯撒窗，内插倍数32，并且给定信号范围，验证了内插器的正确性，画出了内插前后信号的频谱。-The code design the interpolator based on polyphase filter using two methods.The low pass filter is 128 order Caesar window and interpolation multiple is 32.I give the range of the signal to verify the interpolator and plot the spectrum of the signal before and after the interpolator.