Design Of The Event Recorder Base On Digital Audio And Video

Event recorder is an electronic equipment which can record events of the important information. It has been widely used in the military, transport, public security, fire control, industrial production supervision and other domains.Firstly, combining recorder industry development status and developing trends, this paper puts forward the recorder aming at specific events, and realizes playback function (i.e. events scheduled periods before the video data record) include video and after before police footage. The recorder adopts embedded technology with great portability. According to save storage space events recorded, avoid invalid information recorded, save energy, it saves the cost of the hardware owing to reducing the storage space.Next, the paper makes requirement analysis to the recorder and introduces the function of each module (audio, video module, MEPG4 module GPIO module). About the hardware, the digital audio and video recorder adopts the event ARM9 chip Z228 performance multimedia processor as the core and uses ARMLinux operating system.Then, it describles the establishing process of developing platform and system design and introduces the method of testing system.Finally, it makes the whole design to the system software and focuses on the pre-alarm function and puts forward to the manner to improve the accuracy of pre-video.The design realizes some functional requirements and monitors the scene on real time and saves the audio-visual materials according to the requirements when there are events.According to the need, the function of the system can be further expanded and be more rich.