frequency coding

例句：

1. 1.In digital communication, frequency coding is used to modulate the carrier signal.
   在数字通信中，使用频率编码来调制载波信号。
2. 2. The radio station uses frequency coding to distinguish between different channels.
   该广播电台使用频率编码来区分不同的频道。
3. 3. The new transmission system employs frequency coding to improve signal strength and reliability.
   新的传输系统采用频率编码以提高信号强度和可靠性。