Interpolation Filters. Write a Matlab program to read andupsample the linked voice_samp_8k.wav file (below --sampled at Fs=8000 samples per second) by an integer factor L (youcan choose, probably in the range from 3 to 7 or so). Then useinterpolation filtering to produce the following outputs and listento them and plot short segments (~50-100 samples) of these outputs:(i) upsample only with no interpolation filtering, (ii) holdinterpolation implemented directly as a causal FIR filter, (iii)linear interpolation implemented directly as a causal FIR filter,and two other designed FIR lowpass interpolation filtering with(iv) shorter (~20-200) FIR filters and (v) longer (~200-2000) FIRfilters that you design with fir1(). Verify that yourprogram is doing what you want by looking at plots of the variousoutputs. Also note any interesting observations.
