•
Hence, the value is
predictable for arbitrary times
and can be reproduced
identically arbitrarily often.
11
Probabilistic Signal
•
Has only
probabilistic
representation such as mean
value, root mean square and
etc
•
Also known as
random signal
•
The value of the signal cannot
be predicted accurately
•
E.g. noise in communication
system

Harmonic Signal
condition for harmonic signal
where
n
= any integer
minimum value for
T
is known as the fundamental period
T
0
fundamental frequency is
12
)
(
)
(
)
(
nT
t
f
T
t
f
t
f
rad/s
2
2
Hz,
1
0
0
0
0
0
T
π
f
π
ω
T
f

Even and Odd Signal
Even signal
Odd signal
if
has the same value at time
t
and
–
t
for all value of
t
symmetry at vertical axis
•
If
•
the value of odd signal at time
t
is
negative to the value at time
–
t
•
anti-symmetry at horizontal axis
13
)
(
)
(
t
f
t
f
)
(
)
(
t
f
t
f