A.和時(shí)間成正弦規(guī)律變化 B.和時(shí)間成周期性變化 C.其相位差是不變的
A.AM1 B.RZ C.NRZ
A...1 0 0 0 0 0 0 0 0 1 1 1 0...... B.+1 -1 0 0 -1 +1 0 0 +1 -1 +1 -1 0...... C.+1 0 0 0 0 0 0 0 0-1 +1 -1......