DTFT, DFT, ZT, and FFT 537
− 15
− 40 − 30 − 20 − 10 0 10 20 30 40
− 10
− 5
0
Amplitude
5
10
15
20
Auto-correlation plots
R11
R22
R1
FIGURE 5.49
(See color insert following page 374.) Autocorrelation plots of part c of Example 5.11.
abs[conj[fft(f1n)]*fft(f2n)] versus W
abs[fft(xcorr(f1(n),f2(n)))] versus W
0
0
100
200
Magnitude
300
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
0
0
100
200
Magnitude
300
0.1 0.2 0.3 0.4 0.5
W
0.6 0.7 0.8 0.9 1
FIGURE 5.50
Plots of part d—abs[conj[fft(f1n)] * fft(f2n)] and abs[fft(xcorr(f1(n), f 2(n)))]—of Example 5.11.