Biomedical Engineering Reference
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u
(
t+a
)
-a
0
t
FIGURE 10.7
:
Negative translation. The unit step function,
u
(
t
+
a
), translated backward along
the time-axis,
−
t
, by some length,
−
a
u
(
-t
)
0
t
FIGURE 10.8
:
Folding. A unit step function rotated about the
y
-axis,
u
(
−
t
)
u
(
a - t
)
0
a
t
FIGURE 10.9
:
Positive translation of folded step function. Shown is the result of a positive
translation in time (length,
+
a
) of a folded unit step function,
u
(
a
−
t
)
0
t
-u
(
t
)
FIGURE 10.10
:
Folding about the
x
-axis. A unit step function is shown folded about the
x
-axis,
−
u
(
t
)
a
0
t
-u
(
t - a
)
FIGURE 10.11
:
Folding and translation about the
x
-axis. A unit step function folded about the
x
-axis,
t
, then translated or displaced by some time value,
+
a
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