Biomedical Engineering Reference
In-Depth Information
System
System Transfer H(p)
Change in Amplitude
Input X(f )
Output Y(f )
Change in Phase
Amp Ratio Y/X
Phase Change Y and X
FIGURE 18.1
:
System modification of input signal
to other subsystems in such a way that each subsystem will modify its respective input
such that the total output is changed. In addition, the system itself may generate some
type of noise or interference that is only an artifact, which has nothing to do with the
actual function of the system. Noise may cause alteration in the output which may make
the output appear as having been modified by the system. Another type of system may
have multiple inputs as illustrated in Fig. 18.2.
In systems with multiple inputs, one would be evaluating causability. The signal-
processing objective is to determine how much each source of the input signal though
the system transfer,
H
(
f
), is responsible for the output. Other types of systems involve
X
1
(
P
)
System Transfer
H
1
(
f
)
Output
Y
(
p
)
X
2
(
f
)
System Transfer
H
2
(
p
)
X
3
(
f
)
System Transfer
H
3
(
p
)
FIGURE 18.2
:
Multiple input, single output system
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