Biomedical Engineering Reference
In-Depth Information
2.5
2
1.5
1
0.5
0
0
0.5
1
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3
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4
4.5
5
0.5
1
1.5
TIME (s)
(a)
2.5
2
1.5
1
0.5
0
0
0.5
1
1.5
2
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4
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TIME (s)
(b)
FIGURE 11.5 (a) Analog version of a periodic signal. (b) Digital version of the analog signal.
. Sam-
pling is the process by which a continuous signal is first converted into a discrete sequence
in time. If
The two main processes involved in A/D conversion are
sampling
and
quantization
x
(
t
) is an analog signal, sampling involves recording the amplitude value of
x
(
t
)
every
is an inte-
ger that denotes the position or the sample number from the sample set or data sequence.
T
seconds. The amplitude value is denoted as
x
(
kT
) where
k ¼
0, 1, 2, 3,
...
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