本文介绍了一种应用单片机开发的有线对讲系统，其特点是用单片机实现多席控制，仅用一只8欧姆喇叭就可收话，发话，而且音量大、声音清晰、扩容方便。因此，该系统特别适合于工业、机关、学校、部队等部门调度指挥。 This article introduces a kind of wired intercom system developed by SCM, which is characterized by multi-seat control with single-chip microcomputer. It can receive and talk only with one 8-ohm loudspeaker, and the volume is loud, the voice is clear, and the expansion is easy. Therefore, the system is particularly suitable for industrial, government agencies, schools, military and other departments scheduling command.