PRACTICAL MATLAB® FOR ENGINEERS PRACTICAL MATLAB

528 Practical MATLAB® Applications for Engineers

[Magnitude of the DFTs of f1(n), f2(n) & f3(n)] versus W

0 5 10 15

0

20

abs [DFT[f3(n)]]

abs [DFT[f2(n)]]

abs [DFT[f1(n)]]

40

60

0

0.5

1

1.5

0

10

20

frequency W in rad.

FIGURE 5.40
Plots of absDFT of f 1 (n), f 2 (n), and f 3 (n) of Example 5.9.

[f(n) = f1(n) + f2(n) + f3(n)]

0

2

0

20

40

60

− 10

0

10

− 2 51015

0 5 10 15

frequency W in rad.

angle [DFT[f(n)]]

abs [DFT[f(n)]]

Amplitude time index n

W

FIGURE 5.39
Plots of [f(n) = f1(n) + f2(n) + f3(n)] and abs{DFT[f(n)]} of Example 5.9.