High-definition television

High-definition television (HDTV) provides a resolution that is substantially higher than that of standard-definition television.

HDTV may be transmitted in various formats:

The letter "p" here stands for progressive scan, while "i" indicates interlaced.

When transmitted at two megapixels per frame, HDTV provides about five times as many pixels as SD (standard-definition television).

History

The term high definition once described a series of television systems originating from August 1936; however, these systems were only high definition when compared to earlier systems that were based on mechanical systems with as few as 30 lines of resolution. The ongoing competition between companies and nations to create true "HDTV" spanned the entire 20th century, as each new system became more HD than the last. Ironically, in the beginning of the 21st century, this race has continued with 4k, 5k and current 8K systems.

Video clip

Video clips are short clips of video, usually part of a longer recording. The term is also more loosely used to mean any short video less than the length of a traditional television program.

On the Internet

With the spread of Internet global accessing (fastest Internet broadband connection of TCP with accumulator cables and semi fast connection), video clips have become very popular online. By mid-2006 there were tens of millions of video clips available online, with new websites springing up focusing entirely on offering free video clips to users and many established and corporate sites adding video clip content to their websites. With the spread of broadband Internet access, video clips have become very popular online. Whereas most of this content is non-exclusive and available on competing sites, some companies produce all their own videos and do not rely on the work of outside companies or amateurs.

While some video clips are taken from established media sources, community or individual-produced clips are becoming more common. Some individuals host their created works on vlogs, which are video blogs. The use of Internet video is growing very fast. Between March and July 2006, YouTube grew from 30 to 100 million views of videos per day. More recent developments includes the BBC's iPlayer, which was released for open beta testing in July 2007.

Ultra-high-definition television

Ultra-high-definition television (also known as 2160p, UHD-1, Super Hi-Vision, Ultra HD television, UltraHD, UHDTV, or UHD) includes 4K UHD (2160p) and 8K UHD (4320p), which are two digital video formats proposed by NHK Science & Technology Research Laboratories and defined and approved by the International Telecommunication Union (ITU).

The Consumer Electronics Association announced on October 17, 2012, that "Ultra High Definition", or "Ultra HD", would be used for displays that have an aspect ratio of 16:9 and at least one digital input capable of carrying and presenting native video at a minimum resolution of 3840×2160 pixels.

Alternative terms

Ultra-high-definition television is also known as Ultra HD, UHD, and UHDTV. In Japan, 8K UHDTV will be known as Super Hi-Vision since Hi-Vision was the term used in Japan for HDTV. In the consumer electronics market companies had previously only used the term 4K at the 2012 CES but that had changed to Ultra HD during the 2013 CES. The Ultra HD term is an umbrella term that was selected by the Consumer Electronics Association after extensive consumer research.