7
Fourier Series Expansion of Periodic Signals
¥a.There are a finite number of discontinuities in the period T.
¥b.It has a finite average value for the period T.
¥c.It has a finite number of positive and negative maxima in the
¥        period T.
f0 :Fundamental frequency,      
n á f0 : Frequency of each term
an , bn :Fourier series coefficients  :