Design of Digital Voice Conversational Terminal of Coal Mine Based on LWIP
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摘要: 在分析井下扩音电话系统功能局限性的基础上，提出了基于开源的LWIP协议栈设计一种具有网络接口的煤矿数字语音对讲终端的方案，详细介绍了该终端的功能、硬件组成和软件模块；阐述了LWIP协议栈及其在嵌入式操作系统FreeRTOS上的移植，继而分析了LWIP在该终端应用层的设计要点。该终端具备数字扩音广播与对讲功能；采用标准RTP协议，既支持采样频率为8 kHz、16 kHz的话音交互，也支持采样频率高达44.1 kHz的MP3等流媒体在线播放。实验结果验证了该方案的可行性和有效性。Abstract: Based on analysis of function limitation of underground speak telephone system, a novel scheme of digital voice conversational terminal of coal mine with network interface based on open-source LWIP protocol stack was proposed, the terminal's application function, hardware composition and software model were introduced, the LWIP protocol stack and its transplanting to FreeRTOS embedded operating system were described, and design points of LWIP in applications layer of the terminal were analyzed. The terminal has functions of digital broadcasting and talkback, uses standard RTP protocol, and supports voice interaction with 8 kHz and 16 kHz sampling frequencies and on-line streaming broadcasting of MP3 with up to 44.1 kHz sampling frequency. Feasibility and effectiveness of the scheme were verified by experiment results.
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