先将要传递的低频信号（信息）对一个高频副载波进行调频，然后再用该已调频的高频信号对光载波进行强度调制，使其强度按副载波信号发生变化。应用于光纤通信中。
... secondary memory 辅助存储器，外存储器 secondary modulation 二次调制 secondary paging device 二级分页装置 ...
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调制解调器的已调信号通过VHF通信系统进行二次调制，通过VHF通信系统的信道实现数据通信。
Modem signals will be transferred through the VHF communications system has a second modulation, through VHF communication system access to data communications.
信号进行二次调制，引入两个参考信号分别对信号进行互相关处理，从而能抑制与参考信号同频率的干扰。
Modulating twice the signal to be tested and cross correlating it in turn with two reference signals, we are able to do so.
设计出了二次调制系统：采用连续可变斜率增量调制（ CV SD）实现模拟话音信号与数字编码的转换，采用二进制相对相移键控（2 DPSK）作为数字调制方式。
A twice modulation is designed:, CVSD was adopted to realize conversion between analog and digital voice signals, 2DPSK was used as the digital modulation mode.
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