Video Signal Acquisition And Recording Based On Web Server

With the rapid development of network communication technology and embedded technology,the demands for video signal acquisition and recording are increasing,and a variety of applications based on its expansion are also more and more widely.It is developing into an embedded,networking and intelligent system,after the traditional first generation simulation system and second-generation digital local system.This paper analyzes the work principle and technical requirements of video signal acquisition and recording system in detail.Combined with the development of embedded applications at home and abroad,the overall program based on TI's ARM chip as the core processor is put forward.It can achieve video signal acquisition and recording functions based on Web Server.It mainly changes the video analog signal into a digital signal.The system hardware includes front conditioning module,data acquisition module,server module and other parts.Front conditioning module is mainly composed of AD9832 and front-end signal conditioning circuit.The data acquisition module mainly consists of FPGA and SDRAM.It controls the video signal from the AD input and does high-speed buffer into the server module through the SDRAM.Server module consists of TM4C1294 NCPDT chip and Micro SD card,network port and other peripheral circuits.It can accept the client browser command through the network for data acquisition and recording.The content is stored in the SD card in the file format and supports data for uploading client page and displaying.The software mainly includes internal logic design about the FPGA as well as the TM4C1294 NCPDT software design.The main functions of FPGA software design are resolving configuration acquisition parameters according to the command of ARM chip,controlling the AD acquisition data and sending the data into the ARM chip through the SDRAM large buffer.The main design functions of ARM are the completion of FPGA data reception,data storage as a file and building command interaction of embedded Web Server and the browser.In this paper,based on the hardware debugging,respectively for each module of the software design and debugging,debugging from the final results,the basic realization of the recording function of the video signal acquisition,reduction of video simulate signal.Video signal acquisition and record the hardware board of the system,the introduction of the Internet will no longer be distance restrictions,to achieve the client users can collect and record the data whenever and wherever possible,with good prospects for development.