Chapter 3 Fourier series Example Periodic Impulse Trains(周期冲激串) x()=∑8(t-k7 k=-∞ 2T-TL0T 2T T/2T/2 k k=0,±1,±2,… T k 元 x()=∑e"r T k: 0002 ()=∑H/2n)m e10 Chapter 3 Fourier Series Example Periodic Impulse Trains (周期冲激串) x(t) − 2T −T 0 T 2T t (1)   ( ) 2 1 jk t T k x t e T +  =− =  ak T 1   -ω0 0 ω0 2ω0  −T / 2 T/ 2 0, 1, 2, 1 = k =   T ak ( ) 2 1 2 jk t T k y t H jk e T T + =−   =        ( ) ( ) k x t t kT + =− = −  