4. Convert the analog voltage E(t) - 2 sin 4nt mV into a discrete time signal. Specifically, use sample time increments of (a) 1/8 second, (b) 1/5 second, (c) 1/3

second, and (d) 1/21 second, and use a data set of 128 points. 4-1) Plot 4 seconds of each series as a function of time using either Excel or Matlab.Discuss apparent differences between the discrete representations of the analog signal. 4-2) Compute and plot the DFT for each (a), (b), (e), and (d) using a data set of 128 points. Use either Excel or Matlab for the DFT. Discuss apparent differences between the DFTs of the analog signal.