This eduGuide is intended for the video professional that is starting to become involved with designing, specifying, operating or maintaining digital video broadcast and distribution systems for HDTV. For over 50 years our industry has used television technology of a primarily analog nature. True, some digital technology has been used in broadcast facilities for standard definition or NTSC and PAL systems, but its deployment has been limited and ultimately converted back to an analog signal for distribution and broadcast.
Today, HDTV is the first broadcast technology designed to be exclusively digital from image capture to display on the consumer’s TV set. Many different technologies are used where the video, and audio, undergoes many transformations from start to finish. This eduGuide will help you to understand the chain of technologies used, the industry standards behind them, for both copper and fiber optic distribution, and the practices video professionals are developing for the new world of HDTV.
The Role of Technical Standards
The broadcast industry, unlike the A/V and computer industries, has historically been a proponent and practitioner of technical standards for video and audio processing and distribution. The reason is simple: interoperability. The broadcaster, and those in related professional video industries, need to be able to select the best equipment for the task at hand. Since all the equipment in a distribution or edit suite will need to process the same video and audio, there is a need to define and adhere to interface standards between the various pieces of equipment.
There are several technical standards organizations in the world that develop and promote these standards but perhaps the most noted is SMPTE. The Society of Motion Picture and Television Engineers (SMPTE) has membership and participation from individuals, broadcasters and equipment manufacturers from around the world. The expertise and experience brought to bear by this group creates a forum for developing very powerful and lasting standards.
The buyer and user of broadcast equipment is the ultimate beneficiary of this process. He can be assured that products compliant with a particular set of standards will allow video and audio signals to be communicated between them in a recognizable way without requiring additional processing or interfacing. The benefit to the user is lower design and operational costs and a wider selection of equipment to choose from for a particular application without being locked in to any one equipment manufacturer employing proprietary interfaces and protocols.
Download pdf HDTV Standards and Practices for Digital Broadcasting
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