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1.In the frequency modulation system, the signal is sent through a radio wave.
在调频调制系统中，信号通过无线电波发送。
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2. The frequency modulation technique is used to enhance the quality of audio signals.
频率调制技术被用来提高音频信号的质量。
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3.The frequency modulation process involves adjusting the frequency of the carrier signal to match the desired output signal.
频率调制过程涉及调整载波信号的频率以匹配期望的输出信号。