图8.3理解抽样定理 X() X() X() 信道 理想低通 s(0 (a)抽样传输 X() X() OTs 2Ts (b)抽样示意波形图8.3 理解抽样定理 x(t) xs (t) 0 Ts t 2Ts (b)抽样示意波形 xs (t) 信道 理想低通 x(t) s(t) (a)抽样传输 xs (t)