电子科发女学光电科学与工程学院 SCHOOL OF OPTOELECTRONIC SCIENCE AND ENGINEERING OF UESTC 2.Fourier Series ◆Fourier series Fourier Series can be expressed as the sum of sines and cosines multiplied by appropriate coefficients. 2πn f0=∑ce n=-00 where c,7打f0y守an-nL2 2πn( ) 2 n j t T n n f t c e   =− =  Fourier Series can be expressed as the sum of sines and cosines multiplied by appropriate coefficients. 2. Fourier Series where ( ) 2 2 2 1 , 0, 1, 2,... n T j t T n T c f t e dt n T  − = =    ◆ Fourier Series