First, generate a polyphonic sine, and then make zero interpolation, and then fill the zero interpolation signal into a low-pass filter inside, so there are three versions of the signal, the original signal, zero interpolation signal, and interpolation filter After the signal.

Interpolation filter\daima2.m
Interpolation filter\gen_quant_multi_sin.m
Interpolation filter\kaiser_win_spectrum_plot.m
Interpolation filter

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