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50
Displacement [mm]
100
Reference signal + noise
Reference signal
SNR = 387.1
SNR = 30.6
SNR = 85.4
SNR = 1052.3
SNR = 808.9
−50
0
SNR = 1316.3
0
5
10
15
20
25
30
Time [sec]
Figure B.9 Representation of a reference signal before and after adding noise. Dot vertical lines
indicate when the added random noise is pooled from sources of different variance. Singal-to-noise
ratio (SNR) was defined as SN R =
2
σsi
gnal
σ2noise
.
0
5
10
frequency
30 Hz
15
0
20
40
60
80
frequency
230 Hz
−60
−30
Series: x
Raw Periodogram
spectrum (dB)
−10
−40
−70
spectrum (dB)
−15 −5
Series: x
Raw Periodogram
−30
spectrum (dB)
Series: x
Raw Periodogram
0
50
100 150 200 250
frequency
500 Hz
Figure B.10 Power spectral density of the raw COP signals obtained at different sampling rates
(only the COPAP is shown).
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