single-frequency code

例句：

1. 1. The new communication system uses a single-frequency code to ensure secure data transmission.
   新的通信系统使用单频编码来确保数据的安全传输。
2. 2. This algorithm is designed to detect and decode multiple signals using a single-frequency code.
   这个算法被设计用来检测和解码多个信号，使用单频代码。
3. 3. In the field of telecommunications, single-frequency codes are widely used for secure communication.
   在电信领域，单频码被广泛使用来进行安全的通信。