Let a signal be defined by x (t) = 2 cos (4?t) + 5 cos (15?t) .
Find the CTFTs of x (t ? 1/40) and x (t + 1/20) and identify the resultant phase shift of each sinusoid in each case. Plot the phase of the CTFT and draw a straight line through the 4 phase points that result in each case. What is the general relationship between the slope of that line and the time delay?
The slope of the line is ?2?f times the delay.
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