modulator band filter out

例句：

1. 1. The radio's modulator is responsible for the frequency modulation.
   收音机的调制器负责频率调制。
2. 2.The modulator in the transmitter converts the signal from baseband to the desired frequency.
   发射机中的调制器将信号从基带转换为所需的频率。
3. 3. The modulator is used to adjust the amplitude of the signal.
   调制器用于调整信号的振幅。