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1、RT
2、数字调制之后（假如是PSK调制）是不是变成了模拟信号？（课本上都是正弦波的连续波形）那怎么进行DAC转换呢？
不知道我描述的是不是很清楚，期待您的帮助~
我理解的数字调制后还是数字信号（估计会有专门的数字算法），经过DAC之后才变成了模拟信号。
