anti-sidetone circuit

例句：

1. 1. Theanti-sidetone circuit is used todetect the presence of a person in theroom.
   反侧音电路用于检测房间内是否有人。
2. 2. The anti-sidetone circuitwas designed to improve the accuracy of thesystem.
   反侧音电路被设计用来提高系统的准确性。
3. 3. The anti-sidetone circuitwas used to prevent interference from external sources.
   反侧音电路被用来防止外部干扰。