A chirp signal is a sinusoid of continuously changing frequency. Chirps are frequently used to jam communication trans-missions. Consider the chirp (a) A measure of the frequency of the chirp is the so-called instantaneous frequency which is defined as the derivative of the phase in the cosine, i.e., IF(n) = d(θn 2 )/dn. Find the instantaneous frequency of the given
Chapter 11, Problem #32
A chirp signal is a sinusoid of continuously changing frequency. Chirps are frequently used to jam communication trans-missions. Consider the chirp
![x[n] = cos(en)u[n], 0 = ,0 < n <L– 1.](https://s3.amazonaws.com/si.question.images/images/question_images/1545/9/0/3/2415c249c89a33721545885825170.jpg){kind=small}
(a) A measure of the frequency of the chirp is the so-called instantaneous frequency which is defined as the derivative of the phase in the cosine, i.e., IF(n) = d(θn2 )/dn. Find the instantaneous frequency of the given chirp. Use MATLAB to plot x[n] for L = 256.
(b) Let L = 256 and use MATLAB to compute the DTFT of x[n] and to plot its magnitude. Indicate the range of discrete frequencies that would be jammed by the given chirp.
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