普通调幅信号uAM= 100(1 + 0.4cos6.59 ´ 103t)cos6.69 ´ 106t mV,其调制信号的频率W、载波的频率wc和调幅度ma分别为( )。
A.
W = 6.59 ´ 10 3 rad/s , w c = 6.69 ´ 10 6 rad/s , m a = 1
B.
W = 6.69 ´ 10 6 rad/s , w c = 6.59 ´ 10 3 rad/s , m a = 1
C.
W = 6.59 ´ 10 3 rad/s , w c = 6.69 ´ 10 6 rad/s , m a = 0.4
D.
W = 6.69 ´ 10 6 rad/s , w c = 6.59 ´ 10 3 rad/s , m a = 0.4