无线双模视频传输设备的硬件设计与实现

Hardware Design and Realization of Wireless Dual-model Video Transmission Facility

针对高速无线视频传输的需求,设计了一种基于双核(ARM+DSP)CPU OMAP3530,融合TD-SCDMA和CDMA2000无线网络技术的手持双模远程视频传输设备。论述了无线双模视频传输设备硬件设计中的关键技术,包括主要器件选型、电路设计和PCB制作以及软件设计。实验结果表明,本系统经过在DSP内实现的H.264视频压缩和ARM中实现的负载均衡算法后,能有效提高编码效率,减少发送数据量,并能充分利用无线网络带宽资源。在TD-SCDMA和CDMA2000双模的环境下,能够为远程监控提供清晰流畅的视频效果,可有效解决第二代无线通信在视频传输时带宽不足的问题。

For the high-speed wireless video transmission need, a wireless hand-held dual-model and long-distance video transmission equipment with TD-SCDMA and CDMA2000 is designed based on OMAP3530 which has ARM＋DSP kernel. The key technologies of the hardware design are discussed, including the selection of the components, the circuit design, PCB layout and the outline of software design. The experimental results show that this system can effectively improve the coding efficiency, reduce the amount of data sent and take full advantage of the wireless network bandwidth resources after the H.264 video compression within the DSP and load balancing algorithm within the ARM. In the TD-SCDMA and CDMA2000 double model＇s environment, it can provide the smooth long-distance monitoring video effect, sharply resolving the video transmission problem of the insufficient bandwidth in the second generation of wireless communication.