Civil Engineering Reference
In-Depth Information
60
50
40
30
20
10
0
0
100
200
300
400
500
a)
Frequency (Hz)
40
35
30
25
20
15
10
5
0
0
100
200
300
400
500
b)
Frequency (Hz)
0.6
0.4
0.2
0
-0.2
-0.4
-2
-1
0
1
2
c)
tau (s)
Figure 1.21
Chirp signal, linear sweep 100-300 Hz in 2 seconds. a) Spectrum, linear scale. b) Spectrum,
logarithmic scale (arbitrary). c) Autocorrelation function.
