基于DSP和FPGA的语音基带处理系统

本文介绍了一种应用于数字通信领域的语音基带处理系统。设计的目的是把待传输的模拟语音信号转换为数字基带信号,使用固定的频率在信道上传输。根据系统的功能,设计中主要采用了DSP和FPGA芯片,重点考虑了语音信号的数字化和编/解码、数据传输等功能。本系统的语音数字化和编/解码采用了连续可变斜率增量编码调制CVSD,通过DSP芯片实现了语音基带处理的功能,并且利用对FPGA的编程技术完成了数字信号的QPSK调制/解调。最终系统的功能在电路板上得到验证,实现了语音信号的编码与解码。

Voice baseband processing system based on DSP and FPGA

This thesis introduces the design of a system that can process voice baseband signal. The purpose of this design is to convert Analog voice signal to Digital baseband signal, so it can be transmit though channel using fixed frequence. The system mainly utilizes the chips of DSP and FPGA, and considers the functions such as digitzing and coding/decoding of voice signal, data transmission and so on. The encoding/decoding of voice signal is finished by the mode of CVSD, while it uses DSP to make the function of processing voice baseband come ture. By the way, it uses the FPGA to finish QPSK modulate/demodulate of Digital signal. Finally, all the functions in the system have been achieved and verified on the circuit board.