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【单选题】
DSB 信号的频谱就是将调制信号的频谱幅度减小一半后,分别搬移到以载波角频率 Wc 为中心的 ( ) 处,并在其上再各自叠加一个强度为 0 的冲击分量。
A.
±Wc/2
B.
±Wc
C.
±2Wc
D.
±4Wc
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