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CHAP. 61 FOURIER ANALYSIS OF DISCRETE-TIME SIGNALS AND SYSTEMS
DISCRETE FOURIER TRANSFORM
6.49. Find the N-point DFT of the following sequences x[n]:
(a) From definitions (6.92) and (1.45), we have
Figure 6-34 shows x[n] and its N-point DFT X[k].
n
Fig. 6-34
(b) Again from definitions (6.92) and (1.44) and using Eq. (1.90), we obtain
Figure 6-35 shows x[n] and its N-point DFT X[k].
Fig. 6-35
