squelch circuit

例句：

1. 1. The engineer designed a squelch circuit to improve the system's reliability.
   工程师设计了一个回响电路来提高系统的稳定性。
2. 2.The squelch circuit was used to prevent unwanted signals from interfering with the main communication channel.
   使用回响电路是为了防止不希望的信号干扰主要的通信信道。
3. 3.In the event of an emergency, the squelch circuit automatically switches to a backup communication system.
   在紧急情况下，回响电路会自动切换到备用通信系统。