Let X(e j ) = 2e j4 , < . (a) Use the
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Let X(ejω) = 2e−j4ω, − π ≤ ω < π.
(a) Use the MATLAB functions freqzand angle to compute the phase of X(ejω) 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 angleuse the function unwrap in the resulting phase and plot it. Does the phase appear linear?
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