Based on the research of video surveillance system's history actuality and trend, thesis complete the research and design of gather subsystem of multimedia digital video surveillance.
基于对视频监控系统的历史、现状和发展趋势的研究，本论文完成了多媒体数字视频监控采集子系统的研究与设计。
The design also joined the commonly used digital control and status lights that indicate lights commonly used circuit, making the whole more complete and more humane.
本设计还加入了常用的数码管显示及状态灯显示灯常用电路，使得整个设计更加完整，更加灵活。
Design, construction and verification test is made to complete a multi-frequency excitation source based on FPGA and to complete a digital quadrature demodulator.
完成了基于FPGA平台的多频恒流激励源和数字化正交序列解调模块的设计、构建与实验验证。
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