题目内容
抑制载波双边带调制是在传输信号中去掉了载波分量的幅度调制方式,可明显提高调制效率。
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残留边带(VSB)调制既克服了DSB信号占用频带宽的缺点,又解决了SSB调制不易实现的难题。
调频和调相统称为角度调制,调频可以通过微分加相位调制器来实现。
The teacher should not demonstrate to let the students understand the purpose and intention in the meaningful practice.
Teachers should gradually reduce the control of students because their role is mainly to guide, supervise, monitor and evaluate in the meaningful practice.
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