520
Practical MATLAB
® Applications for Engineers
[Errors] versus time index n
4
× 10
−15
2
0
Amplitude
−2
−4
0
1
2
3
4
time index n
5
6
7
8
FIGURE 5.33
Error plot of part a with respect to part b of Example 5.6.
FIGURE 5.32
Plots of part b of g(n) and DFT[g(n)] evaluated by circular convolution of Example 5.6.
0
1
2
3
4
5
6
7
8
0
1
2
3
4
5
6
7
8
0
1
2
3
4
5
6
7
8
frequency W
frequency W
Phase of DFT[g(n)] versus W
Magnitude of DFT[g(n)] versus W
Circular convolution g(n)=ifft[DTF(f(n)*DTF(h(n)] versus n
time index n
40
100
50
0
20
Amplitude
Magnitude
Angle in rad.
−20
0
5
0
−5
CRC_47760_CH005.indd 520
CRC_47760_CH005.indd 520
7/23/2008 1:47:33 PM
7/23/2008 1:47:33 PM