习题3.6 0T=2过1=% 2元 1)f、=1kH2, f=0以 0.2π×1 0 .1kHz 2π 2n 2)f、=1kH, 6=0以 0.2元×5=0.5kHz 2元 2π 3)f,=200H, f=05- 0.2π×0.2 =20Hz 2π 2元Hz f f f Hz kHz f f f kHz kHz f f f kHz f T f f f c s c s c s c s c s c s c s c c c s c 20 2 0.2 0.2 2 3) 200 , 0.5 2 0.2 5 2 2)) 1 , 0.1 2 0.2 1 2 1) 1 , 2 2 / 3.6 =  = = = =  = = = =  = = = =  =  =                 习题