Biomedical Engineering Reference
In-Depth Information
White Noise
1.2
1
0.8
0.6
0.4
0.2
0
−
0.2
−
0.4
0.6
−
−
0.8
−
1.
−
1
0
0.2
0.4
Time (sec)
(
a
)
0.6
0.8
1
FFT of White Noise
2.5
2
1.5
1
0.5
0
−
0.5
Frequency (Hz)
(
b
)
Figure 2.19
(a)
A simulated white noise signal from a random number generator with
amplitude
±
1 samples at 2048 samples/sec. Figure 2.19
(b)
is the FFT of the white
noise signal at 1 Hz intervals from 0 Hz to 1024 Hz. The “white” line passing through
this FFT plot is a 40-point moving average showing that the signal has approximately
equal power across the full spectrum of the signal.
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