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频谱线性搬移电路的关键部件是（ ）
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频谱线性搬移电路的关键部件是（ ）
A、相加器
B、乘法器
C、倍频器
D、减法器
时间：2021-09-01 23:33
关键词：
青书学堂
黑龙江省教育学院
电子线路及实验（专升本）
答案解析
B
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在发送端需要把数字基带信号的频谱搬移到带通信道的通带范围内，这个频谱的搬移过程称为（）。相应地在接收端需要将己调信号的频谱搬移回来，还原为数字基带信号，这个频谱的反搬移过程称为（）
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