基于FPGA的PCM编码器与解码器的设计与实现

Design and realization of PCM encoder and decoder based on FPGA

针对传统数字电路难以支持实现高码速率的PCM功能,提出将PCM的编、解码功能集成到具有硬件密度高、结构灵活、加密性好的现场可编程门阵列(FPGA,Field Programmable Gate Array)上的实现方案。介绍了PCM码型定义和帧格式,阐述了该方案的结构框架和设计方法,并结合实例和实测波形,说明PCM编、解码器的功能实现过程。实践表明,FPGA可以有效地用于PCM高码速率场合,在遥测系统中有实用意义。

It＇s difficult to realize PCM function in high bit rate for traditional digital circuit. This paper presents the scheme of integrating encoding and decoding functions with FPGA which has the advantages of high density in hardware, flexible structure and fine encryption; de- scribes the definition of PCM code and its frame format; introduces the design scheme about structure and method. Combined with the instance and surveying waveform, the paper shows the realizing process of PCM encoding and decoding. Experiment results indicate that FPGA can be used in PCM high bit rate and it has practical meaning in remote measurement system.