中文说明：
常规AM调制：画出调制前波形图和频谱图，求已调信号功率、噪声功率等。
English Description：
Conventional AM modulation: draw the waveform diagram and spectrum diagram before modulation, and calculate the modulated signal power, noise power, etc
Conventional AM modulation: draw the waveform diagram and spectrum diagram before modulation
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中文说明：
常规AM调制：画出调制前波形图和频谱图，求已调信号功率、噪声功率等。
English Description：
Conventional AM modulation: draw the waveform diagram and spectrum diagram before modulation, and calculate the modulated signal power, noise power, etc