Question: Sketch the spectrogram obtained by using a 256-point rectangular window and 256-point DFTs with no overlap (R = 256) on the signal x[n] cos [n/4

Sketch the spectrogram obtained by using a 256-point rectangular window and 256-point DFTs with no overlap (R = 256) on the signal

x[n] cos [πn/4 + 1000sin (πn/8000)]

for the interval 0 ≤ n ≤ 16,000.

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