In ordinary amplitude modulation, the carrier component is an equal amplitude fixed frequency sine wave. It does not contain the information of the modulated signal, but it occupies most of the power, so this transmission method is uneconomical. The so-called double-sideband modulation is to suppress the carrier and transmit only two sideband signals.
Double-band modulation can be achieved with a multiplier, as long as the modulated signal 
The purpose of suppressing the carrier wave can be achieved, which is easier to implement. The principle of double-sideband modulation is shown in Figure 5.4-38.
Multiplier output
In this way, double-sideband modulation is achieved. Since no DC quantity is required in UQ, it is easier to implement.
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