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针对目前无线网络带宽资源有限的状况,研制了基于CDMA 1X网络的远程视频实时监控系统,系统采用高压缩率的MPEG-4视频压缩算法和ARM,Linux嵌入式设计技术。分析了系统的结构和工作原理,介绍了USB驱动程序和PPP拨号程序移植到嵌入式Linux平台上的方法,并进一步探讨了如何利用多链路连接技术提高无线传输带宽。最后阐述了利用VC编程播放MPEG-4视频码流的关键技术。系统在现有CDMA 1X无线网络带宽条件下可以实时传输CIF(352×288)格式的视频码流达8-20帧/秒,可以满足一般情况下视频监控的需求。
In view of the limited wireless network bandwidth resources, a remote video real-time monitoring system based on CDMA 1X network is developed. The system adopts MPEG-4 video compression algorithm with high compression ratio and embedded design technology of ARM and Linux. The structure and working principle of the system are analyzed. The method of porting USB driver and PPP dialer to the embedded Linux platform is introduced. And how to improve the wireless transmission bandwidth by using multi - link connection technology is also discussed. Finally, the key technologies of playing MPEG-4 video stream by VC program are described. System in the existing CDMA 1X wireless network bandwidth conditions can be real-time transmission CIF (352 × 288) format video stream up to 8-20 frames / second, to meet the general requirements of video surveillance.