本文介绍了集程控和共电式扩音功能于一身的ＨＣＢＫ系列程控防爆扩音对讲电话机的工作原理。采用单片机８０３１作为控制器，双音频发送接收芯片ＭＴ８８８０进行通信。可以实现话机的按键选号、单呼、群呼、全呼功能，且可自由设定号码和等级，不同等级可以实现不同的呼叫方式。该产品是石油、化工等易燃、易爆、噪音大等场所生产调度的理想通讯设备。 This article introduces the working principle of HCBK series programmable explosion-proof loudspeaker intercom which integrates the functions of programmed control and common electric amplification. Adopt the one-chip computer 8031 ​​as the controller, double audio frequency sends and receives the chip MT8880 to carry on the communication. It can realize button selection, single call, group call and full call function of the phone, and can freely set numbers and levels, and different levels can implement different call modes. The product is oil, chemical and other flammable, explosive, noise and other places production scheduling ideal communication equipment.