Quadrature Amplitude Modulation (QAM) is used to transfer signals by digital TV system based on DVB_C standard.

基于DVB_C标准的数字电视系统采用正交幅度调制(QAM)传送信号。

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QAM (Quadrature Amplitude modulation) has been widely used in various digital communication systems due to its high modulation efficiency.

正交幅度调制(QAM)具有较高的调制效率，被广泛应用于各种数字通信系统中。

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At the same time, we refrain mirror frequency effectively with the method of digital quadrature modulation (DQM).

同时，由于采用了数字正交调制，从而有效地提高了镜频抑制。

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