Electromagnetic interference (EMI) in high-speed digital circuit is mainly generated by Common-mode (CM) noise, and the CM inductance is responsible for CM noise magnitude.

共模噪声是高速数字电路产生电磁干扰的主要原因，而共模电感又是共模噪声大小的决定因素。

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For improving the anti-interference ability of the amplifier, the Differential Mode input with high common mode restraining technology is adopted in amplifier circuits.

为提高放大器的抗干扰性能，放大器电路采用共模抑制能力很强的差模输入方式。

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The master control chip uses AT89C51, the communication mode adopts DTMF signal with strong anti-interference and high reliability, and simplex frequency modulation.

主控芯片采用AT89C51单片机，通信方式采用抗干扰能力强、可靠性高的DTMF信号和单工调频的无线通信方式。

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