两种相位抵消法消侧音原理及其电路形式

为帮助正确理解及运用常见的消侧音电路,分别讨论了加法和减法电路实现的相位抵消法消侧音原理。几种典型电路均用到运算放大器。为直观认识每种电路的特点,估算了接收方获得信号和发送方输出信号的比值（电压比）,每种电路均经TINA-TI软件仿真和实际电路验证,估算值和仿真、验证结果一致。这些消侧音原理和电路可应用在楼宇对讲、无线对讲等场合。最后,分享了一些设计和制作消侧音电路的经验。

Anti-sidetone principles of two phase cancellation techniques and their typical circuits

To better understand and use the commonly used anti-sidetone circuits,anti-sidetone principles of two phase cancellation techniques realized by the addition and subtraction circuits respectively are discussed in the paper.Several typical circuits are applied in the operational amplifiers.To intuitively understand the features of each typical circuit,the voltage ratio of received signals and transmitted signals is estimated.Every typical circuit is simulated by TINA-TI software and verified by the actual circuit.It is indicated that the estimation value is consistent with the simulation and verification results.These principles of anti-sidetone and typical circuits can be applied in wired or wireless intercom system.Finally,the experience in designing and producing the anti-sidetone circuits is shared.