modulation circuit

例句：

1. 1. This modulation circuit is used to transmit signals over long distances.
   这个调制电路用于在长距离上传输信号。
2. 2.The engineer designed the modulation circuit to meet the specific requirements of the project.
   工程师设计了调制电路以满足项目的具体需求。
3. 3.The modulation circuit was responsible for converting the analog signals into digital data.
   调制电路负责将模拟信号转换为数字数据。