A Multi-Video And Audio Collecting And Processing System Design Based On DSPs

The technology of image and sound collecting and processing has a very important role in information processing technology. It is involved in industry measurement, medical equipment, military and consuming electronics products areas. In general application, image and sound collecting and processing system is based on computer. But in the situations that require low cost and small volume.There will have more research value for developing image and sound collecting and processing system based on DSPs (Digital Signal Processors) and application value for embeded the system in products that related closely with people's life.The multi-video and audio collecting and processing system is designed with digital signal processor of TI company produced TMS320DM642. The primary characteristics in this system are:1. disposing 4 route video and 4 route audio analog input signals, 1 route video analog output signal and 1 route audio analog output signal on real time.2. Two pieces of SDRAM are used for store video data. It make collecting and processing data working at the same time in CPU, enhanced the system efficiency.3. This system can be used in video monitor, video division and video server. Firstly, the typical applications are introduced of all chips used in this system.Secondly, the hardware configuration and schematic diagram were designed, included CPU module, peripheral memory interface module, video and audio collection module, video and audio output module. Lastly, the software configuration were introduced, included initialized module, video and audio collecting and processing module.This system can manage analog input signal with PAL/NTSC standard, composite video CVBS and component video Y/C. It can manage analog output signal with PAL/NTSC standard, S-video and VGA;can manage microphone or stereo analog input and stereo analog output.