Real-Time Digital Video Multiplexer Synchronisation

Many video applications in security areas such as close circuit television (CCTV) requii-e multiple video channels which must be multiplexed into a single video streani. 'The industiy can only afford to have a few frames or fields per camera. l h i s paper emphasises on a novel Iinrdwaie design using an algorithm for synchronising the analogue video inputs. Therefore the propused multiplexer spsteni is able to achieve a constant stream of 50 digital video fields per second using a CPLD (Complex Programmable Logic Device) for 625/50 video systcm. Background 'Tlic composite analogue inpu t s ai-e conve~ted to Bbit il'll-R (Inteinational 'Telecommunication Union