基于TMS320DM642的矿用数字化扩音电话系统设计

摘要

This paper analyzes the existing drawbackg of broadcast telephone system of coal mine, and introduces a design scheme of digital broadcast telephone system of coal mine baaed on Texas Instruments (TI) TMS320DM642 digital processor and TCP/IP protocol. The system makes use of audio codec chip TLV320AIC23B to achieve audio codec and adaptive anti-noise algorithm so that the output audio' s quality could be good to meet standard of the voice in the mine, and then takes advantage of seamlessly connectivity between TMS32ODM642 EMAC and physical layer chip Intel LXT971 to complete digital voice transmission based on embedded TCP/IP protocol stack. In the System software portion, the system integrates audio collection task, audio processing task, network transmission and other tasks by RF5 in the DSP/BIOS. In the telephone terminal voice signals can be output through speakers or headphones to achieve high-quality, remote, and stable voice communications under mine.%通过分析目前的矿用扩音电话系统的现状,为解决矿井下语音通信中高噪声强干扰问题,提出一种基于数字处理器TMS320DM642和嵌入式TCP/IP协议的矿用数字化扩音电话系统的设计方案；采用音频编解码芯片TLV320AIC23B实现语音处理以达到矿井下语音质量的要求,并利用物理层芯片Intel LXT971与TMS320DM642的无缝连接,实现基于嵌入式TCP/IP协议栈的数字语音传输；系统软件采用RF5框架开发,基于DSP/BIOS实现语音采集,语音处理,网络传输等任务；通过对各关键模块测试与分析,系统运行稳定可靠,实现矿用数字化扩音电话的高质量,远距离和稳定的语音通信.