Digital TV Broadcast System Design

Broadcast digital television system is an important aspect in the final program is the export of production from the various online programs to complete the convergence of the final here, through the broadcast control, launch broadcast link from send to every household, it is an irreversible process. So how best to ensure the safety of television and the quality is the focus of every television station must be taken into account.TV broadcast technology development to this day has been broadcast from the original manual system development for the whole hard disk broadcast system, which has experienced broadcast manually, automatically broadcast the tape, broadcast on dribbling and the whole combination of the phases of the hard disk broadcast in the quality of technical and broadcast that there had been substantial progress. With digital video, automatic control, computer network communications, data storage, multimedia technology, television programs are broadcast from the original analog-based progressive development of the digital broadcast-based, stand-alone systems to the network from distributed systems development, and systems from the traditional broadcast network to broadcast to the hard disk as the center of a new generation of full hard disk automatically into the broadcast system. Broadcast network hard cover material uploaded from the production, transmission, editing, review the entire program to broadcast the broadcast workflow. Norms not only in television news, advertising and other business management, so that the quality of television programs greatly enhanced, and greatly enhance the accuracy and reliability of television at the same time, reducing the operator's labor intensity.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. And the usual network is 1000 Ethernet.In this paper, considering the current domestic television program video and audio collection, scheduling, broadcast, network resource sharing and video storage and other features of the actual operation on the basis of the use of existing computer technology, audio and video codec technology, network communication technology and large-capacity, high-speed hard disk storage technology, to build a television station within the high-speed local area network as the basis for the design a collection to meet the television, broadcast programming and operational needs and other aspects of the broadcast 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 ; Chapter three concerns RAID technique, analyze the choice of RAID levels and ATA disk array applied to video server; Chapter four introduces the television broadcast system in the application, and the whole system to carry out a detailed analysis of features; Chapter five discusses how the digital broadcast system for effective testing and monitoring; Chapter six proposed a number of security safeguards of the broadcast system.The thesis is based on computer technology in order to program the number into the main line to the network as a platform for television based on the existing digital broadcast system and network has made useful explorations, and put forward concrete solutions. The television broadcast system in the development and use of a digital television broadcast system, the transmission network, and resource sharing, and broadcast automation and scientific management, to overcome the existing quality of television programs broadcast unsatisfactory reliability strong, and not fluent in programming, management and other issues closely.