
32-1
A sine-wave signal will have only a single-frequency component in its spectrum, that is, the frequency
of the tone. However, if the sine wave is transmitted through a system (such as an amplier) having
so
me
no
nlinearity,
th
en
th
e
si
gnal
em
erging
fr
om
th
e
ou
tput
of th
e
sy
stem
wi
ll
no lo
nger
be a pu
re
si
ne
wa
ve
. a
t
is
,
th
e
ou
tput
si
gnal
wi
ll
be a di
storted
re
presentation
of th
e
in
put
si
gnal
. Si
nce
on
ly
a pu
re
si
ne
wa
ve
ca
n
ha
ve
a si
ngle
co
mponent
in it
s
fr
equency
sp
ectrum,
th
is
si
tuation
im
plies
th
at
th
e
ou
tput
mu
st
ha
ve
ot
her
fr
equencies
in it
s
sp
ectral
co
mposition
. In th
e
ca
se
of ha
rmonic distortion,
the frequency spectrum of the dis