DMT调制，就是把整个通信信道在频域上划分很多子信道，在每个子信道上仍然采用QAM或类似的带通信号进行传输。其中QAM的通带中心频率应该与相应的子信道的中心频率一致。-DMT modulation, that is, the entire communication channel in the frequency domain divided on a lot of channel in each channel is still used on QAM or similar bandpass

Discrete Multi Tone (DMT) is the modulation scheme used for Asymmetric Digital Subscriber Line (ADSL) systems and one of the modulation schemes used for Very high-speed Digital Subscriber Line (VDSL) systems.