The Research Of Video Capture And Compression Card Based On DM642

The train monitoring and recording devices are operating railway facilities in the analysis of our situation and the transport on the basis of actual demand, and to ensure a safe operation of trains for the primary purpose of the train operating speed control devices. Video frequency recording system is the new increase one part, its main function is: Through the video broadcast front in the path situation and the vehicle the situation, and preserves the data. Preserves the data for the ground broadcast equipment broadcast, could the direct-viewing reappearance at that time actual situation, favor the discovery and the solution train marches forward the some security hidden dangers; But when train appears accident, returned through the video frequency puts the reappearance at that time actual situation, was allowed effectively to analyze the accident cause factor, and solution accident question, Will have the vital significance for the next traffic safety increase safeguard. Based on this goal, this article monitored the recording equipment to the train movement one important constituent ~ video frequency gathering compression card conducts the technical research.This detail H.264 video gathering compression card hardware composition and the software realization at the core of a TMS320DM642 DSP, emphatically narrated this card under Windows2000 operating system actuation development flow, as well as H. 264 codes realizations and from PC to DSP transplant.This article first introduced H.264 encoded principles, mainly introduced Baseline under the profile code pattern some essential technologies; Then explains the entire hardware design, in view of host chip DM642, front end video frequency A/D chip SAA7115 and the I2C main line as well as the PCI main line...