当电视台要把组合视频信号经由无线电波广播出去时，要先把它调制到特定频率的载波上。
When a composite video signal is broadcast over the airwaves by a TV station, it happens on a specific frequency.
在典型的通信系统中，调制过程是数字信号加载在载波的幅度值、载波的频率或者载波的相位上。
In the model communications system, the modulation process also is loaded the digital signal in the carrier scope value, the carrier frequency or on the carrier phase.
伪码调相-载波调频复合信号的识别特征包括伪码特征和频率调制特征。
The features of pseudo code PM-carrier FM combined signal include the pseudo code and the modulation frequency.
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