modulator approach

例句：

1. 1. The radio signal is being modulated by the satellite.
   无线电信号正在被卫星调制。
2. 2. The engineer used a modulator to adjust the frequency of the signal.
   工程师使用了一个调制器来调整信号的频率。
3. 3.The modulator was responsible for converting the analog signals into digital data.
   调制器负责将模拟信号转换为数字数据。