Linear phase and phase unwrappingLet X(e j) = 2e j4,

Linear phase and phase unwrapping—Let X(e jω) = 2e −j4ω, −π ≤ ω<π. (a) Use the MATLAB functions freqz and angle to compute the phase 763 of X(e jω) and then plot it. Does the phase computed by MATLAB appear linear? What are the maximum and minimum values of the phase, how many radians separate the minimum from the maximum? (b) Now, recalculate the phase but after using angle use the function unwrap in the resulting phase and plot it. Does the phase appear linear?