To further understand this connection between a nonperiodic function
and its periodic counterpart, consider the exponential form of a
Fourier series in Eq. (16.58), namely,
f (t) =
∞
n=−∞
cnejnω0t (17.1)
where
cn = 1
T
T/2
−T/2
f (t)e
−jnω0t dt (17.2)
The fundamental frequency is
ω0 = 2π
T
(17.3)
and the spacing between adjacent harmonics is
ω = (n + 1)ω0 − nω0 = ω0 = 2π
T
(17.4)