PRACTICAL MATLAB® FOR ENGINEERS PRACTICAL MATLAB

Analog and Digital Filters 619

FIGURE 6.45

Input and output plots of the LPF of Example 6.4.

 5

5

0

frequency
1000 Hertz

Amplitude

0 0.2 0.4 0.6 0.8

time in sec

1 1.2 1.4 1.6 1.8 2

(^1) Output LPF versus t
0
Output Amplitude
 1
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2
10
Input signal versus t
Input Amplitude
0
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2
 10

10 −^3

10 −^3

10 −^3
FIGURE 6.46
Input and output plots of the HPF of Example 6.4.
 10
10
0
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1

10 ^4

10 ^4

10 ^3
time in sec
Amplitude
frequency
35 K Hrz
10
Input signal versus t
 10
0
Input Amplitude
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2
Output Amplitude^1
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
1
0
0
output HPF versus t