Design of Android visual voice communication terminal of coal mine underground
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摘要: 提出了一种基于低功耗ARM Cortex-A8内核的煤矿井下可视语音通信终端设计方案，详细讨论了可视语音通信终端的功能、硬件组成和软件模块。该方案在Android嵌入式操作系统平台上，结合SIP协议和语音视频编解码器实现井下终端的可视语音通信功能。测试结果表明，可视语音通信终端整机功耗可控制在20 W以内，能够实现本质安全设计；终端进行语音对讲时CPU负荷很轻，处理视频压缩和显示时，CPU平均使用率能够保持在50%以下，性能满足可视对讲需求。Abstract: A novel visual voice communication terminal based on low power ARM Cortex-A8 kernel used in coal mine underground was proposed. The functions, hardware composition and software architecture of the terminal were discussed. SIP protocol combined with voice/video encoder/decoder were implemented on Android operating system to realize visual voice communication. The experimental results show that the overall power consumption of the terminal can be controlled in 20 W, which can achieve intrinsically safe design; the CPU load is very light during voice communication, while the CPU average utilization rate can be kept below 50% during video compression and display, which meets the visual intercom demand.
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Keywords:
- coal mine /
- voice communication /
- visual intercom /
- Android /
- G.723 /
- H.264 /
- SIP
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