Research On Key Techniques Of TV HD Play System

As the TV play and control system is the last export of TV programs,its safety and reliability is always the main considered factor in every TV station.Following the development of digital TV,digtal will be the necessary direction of TV play and control system.Compared with the tradional broadcast system,HD play system has been used in more and more TV station by virtue of the digital characteristic and the higher secure performance.HD play system is based on some key techniques,such as video compress coding,RAID technique and the broad band net.By coding and compressing the TV program,it transforms analog TV signals to digital TV data ,storages the data in hard disk,transmits the data by network,finally it can broadcast TV program with digital or analog method.At present,MPEG-2 is the common video compress coding format in HD play system,it can keep good image quantity under the condition of high compress rate.RAID technique provide big storage capacity and data security,which are the requisite of HD play system.RAID-3 and RAID-5 is more useful.And the usual network is 1000 Ethernet.With the increase in broadcast time and channel,the old video cassette recorder play system is unfit to broadcast in Wujiang TV station.The advanced and mature HD play system give the best choice of rebuilding the play and control system.This article firstly introduces the general situation of the digital TV and HD play system.Chapter two introduces the international video compression standard,mainly analyze MPEG-2 and H.264.Chapter three concerns RAID technique,analyze the choice of RAID levels and ATA disk array applied to video server.Chapter four introduce the application of HD play system to Wujiang TV in detail.Due to the practical need of the project,the research...