A discrete-time sample-and-hold interpolator, by a factor I, repeats the last input samp...

A discrete-time sample-and-hold interpolator, by a factor I, repeats the last input sample (I — 1) times.

(a) Determine the interpolation function

(b) Determine the Fourier transform

(c) Plot the magnitude and phase responses of the ideal interpolator, the linear interpolator, and the sample-and-hold interpolator for I = 5.