【摘要】 数字基带信号的传输是数字通信系统的一个重要组成部分,HDB3编码是数字基带信号传输中常用的传输码型。本文介绍了HDB3编码规则,提出了一种基于EPM3128实现编译码的方法,该方法具有成本低、电路简单、执行速度快、升级方便等特点。同时由于CPLD可重复编程的特点,可以对它进行在线修改,便于设备的调试和运行。此编译码器已经过实际测试,运行稳定可靠,可用于实际电路中。更多还原

【Abstract】 Digital baseband signal transmission plays a very important role in digital communication system.The HDB3 encoding is typically used in baseband signal encoding and decoding.The principle of HDB3 code is introduced first in this paper,and then a HDB3 encoding system which is designed based on EPM3128 is supplied,the advantages include low cost,simple circuit,high speed performing,expedience of updating etc.In addition,since CPLD can be reprogrammed,it can be repaired online,thus making it convenient to debug and run the equipment.Testing shows that this encoder and decoder has stable performance and therefore can be applied to circuitry.更多还原