Biomedical Engineering Reference
In-Depth Information
× 10 4
sig3 (4096x1 real, Fs=250)
1
0.5
0
0.5
1
1.5
0
2
4
6
8
10
12
14
16
Time
(a)
× 10 4
8
6
4
2
0
20
80
40
70
60
60
50
80
40
Window index
Frequency (Hz)
100
30
20
120
10
140
0
(b)
Figure 3.12
(a) EEG signals before and after brain injury and (b) their STFTs.
Frequency
Time
Figure 3.13
STFT time-frequency resolution.
transform. Grossmann and Morlet introduced the wavelet transform in order to
overcome the problem of time-frequency localization of time signals [48]. The
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