Page 323 - Schaum's Outline of Theory and Problems of Signals and Systems
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FOURIER ANALYSIS OF DISCRETE-TIME SlGNALS AND SYSTEMS [CHAP. 6
-4-3-2-1 0 12 34 5 67
Fig. 6-7
6.4. Consider the periodic sequence x[n] shown in Fig. 6-8(a). Determine the Fourier
coefficients c, and sketch the magnitude spectrum lc,(.
From Fig. 6-8(a) we see that the fundamental period of x[n] is No= 10 and R,, =
27r/N,, = ~/5. By Eq. (6.8) and using Eq. (1.90), we get
The magnitude spectrum lckl is plotted in Fig. 6-8(b).
(b)
Fig. 6-8
