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.

Interpolator based on polyphase filter\fftseq.m
......................................\method1.m
......................................\method2.m
Interpolator based on polyphase filter

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