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An Introduction To High Definition TV
High Definition Television (or HDTV) is a digital television broadcasting system with higher resolution than traditional television systems (standard-definition TV, or SDTV). HD (High Definition) TV is digitally broadcast; the earliest implementations used analog broadcasting, but today digital television (DTV) signals are used, requiring less bandwidth due to digital video compression.
The rise in popularity of large screens and projectors has made the limitations of conventional Standard Definition TV (SDTV) increasingly evident. An HD (High Definition) TV compatible television set will not improve the quality of SDTV channels. To display a superior picture, high definition televisions require a High Definition (HD) signal. Typical sources of HD (High Definition) signals are as follows:
- Over the air with an antenna. Most cities in the US with major network affiliates broadcast over the air in HD (High Definition). To receive this signal an HD (High Definition Television) tuner is required. Most newer high definition televisions have an HD (High Definition) tuner built in. For High Definition Televisions without a built in HD (High Definition) tuner, a separate set-top HD (High Definition) tuner box can be rented from a cable or satellite company or purchased.
- Cable television companies often offer HD (High Definition) TV broadcasts as part of their digital broadcast service. This is usually done with a set-top box or CableCARD issued by the cable company. Alternatively one can usually get the network HDTV (High Definition Television) channels for free with basic cable by using a QAM tuner built into their HD (High Definition) TV or set-top High Definition box. Some cable carriers also offer High Definition TV on-demand playback of movies and commonly viewed shows.
- Satellite-based TV companies, such as DirecTV and Dish Network (both in North America) offer HD (High Definition) TV to customers as an upgrade. New satellite receiver boxes are usually required to receive HD (High Definition) content.
- Video game systems, such as the PlayStation 3 and Xbox 360, and digital set-top boxes that rely on an Internet connection such as the Apple TV, and those that don't such as the Netgear Digital Entertainer, can output an HD (High Definition) signal. The Xbox Live Marketplace, iTunes Music Store, and PlayStation Network services offer HD (High Definition) movies, TV shows, movie trailers, and clips for download, but generally at lower bitrates than a Blu-ray Disc.
- Most newer computer graphics cards have either HDMI or DVI interfaces, which can be used to output images or video to an HD (High Definition) TV.
- Almost all computer graphics cards have standard SVGA jacks which can be used to output images or video to an HDTV's "PC Input" jack.
- The optical disc standard Blu-ray Disc (25GB-50GB) can provide enough digital storage to store up to 10 hours of HD (High Definition) video content, depending on encoder settings.
Components of a typical satellite HD (High Definition) TV system:
1. HD (High Definition) TV Monitor
2. HD (High Definition) satellite receiver box
3. Standard satellite dish
4. HDMI cable, DVI-D and audio cables, or audio and component video cablesBesides an HD-ready television set, other equipment is needed to view HD (High Definition) television. Cable-ready TV sets can display HD (High Definition)content without using an external box. They have a QAM tuner built-in and/or a card slot for inserting a CableCARD.
High Definition image sources include terrestrial broadcast, direct broadcast satellite, digital cable, the high definition disc BD, internet downloads, the PlayStation 3, and the Xbox 360. The Nintendo Wii does not display HD (High Definition) content.
HD (High Definition) TV can be recorded to D-VHS (Digital-VHS or Data-VHS), W-VHS (analog only), to an HDTV-capable digital video recorder (for example DirecTV's high-definition Digital video recorder, Sky HD's set-top box, Dish Network's VIP 622 or VIP 722 high-definition Digital video recorder receivers, or TiVo's Series 3 or HD recorders), or an HDTV-ready HTPC. Some cable boxes are capable of receiving or recording two or more broadcasts at a time in HD (High Definition) TV format, and HD (High Definition) TV programming, some free, some for a fee, can be played back with the cable company's on-demand feature. The massive amount of data storage required to archive uncompressed streams make it unlikely that an uncompressed storage option will appear in the consumer market soon. Realtime MPEG-2 compression of an uncompressed digital HDTV signal is also prohibitively expensive for the consumer market at this time, but should become inexpensive within several years (although this is more relevant for consumer HD (High Definition) camcorders than recording HDTV). Analog tape recorders with bandwidth capable of recording analog HD (High Definition) signals such as W-VHS recorders are no longer produced for the consumer market and are both expensive and scarce in the secondary market.
Source: Wikipedia.org
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News Feed and Articles About High Definition Box :
Broadcom's Set-Top Box Technology Powers the EchoStar SlingLoaded™ 922 HD DVR - PR Newswire (press release)
Apple launches online movie box - The Australian
What Apple TV Should Be, but Still Isn't - Motley Fool
Apple takes light bite of TV market - Digital Spy
Living becomes BSkyB's 50th HD channel - Hollywood Reporter
Roku Announces Price Drops On Most Items [Roku's HD Box Goes to $69, HD-XR ... - TFTS (blog)
Add connections with a video source switch - Dallas Morning News
Apple Launches New Set-Top Box, Updated iTunes Program - TMCnet
Met opera adds 300 theaters to its HD broadcasts - The Associated Press
Fox Sports taking a wider view of football - Milwaukee Journal Sentinel ***************************************************
High Definition Box Camera-high Definition Box Camera.Introduced popularly priced high definition box, the tivo(r) hd dvr - comcast to fund development for additional platforms, including scientific. Introduced popularly priced high definition box, the tivo(r) hd dvr - comcast to fund development for additional platforms, including scientific. This high definition monitor and this high definition box will talk to each other, send audio and stay sync, which it will keep the pictures from moving around. High definition box - 398 results like the kworld hdmi dvi vga qam/atsc external digital tv tuner box hdtv, memorex 4x bd-r media standard spindle. Watch itv hd on your sky high definition box. And ooooh, double my viewing pleasure with those dual tuners. It's finally here, oh yeh! sexy box if i've ever seen one. Not to mention world's first and onl. This high definition monitor and this high definition box will talk to each other, send audio and stay sync, which it will keep the pictures from moving around. ***************************************************
Mere High-definition Tv Could Soon Be Lo-techIf you have just blown the budget on a new high-definition TV, look away now. Japanese broadcasters and the BBC are working on a system 33 times more detailed than the best sets on the market.
The BBC plans to use the technology, named Super Hi-Vision by its Japanese makers, to screen coverage of the 2012 Olympics on big screens in city centres across Britain.
Today's high-definition television is still in its embryonic stages in the UK. But most of the larger, flat screens sets on sale today are HD-ready and the BBC has launched a permanent high-definition channel available on cable and satellite.
Satellite TV giant Sky and cable operator Virgin offer high-definition services to subscribers with the requisite set-top boxes and compatible televisions. But researchers in Tokyo and Surrey are already working on better, sharper pictures.
Within seven years, the Japanese public broadcaster NHK hopes to begin test broadcasts of its Super Hi-Vision system, with full-time public broadcasts scheduled for 2025.
Some doubt whether the enhancements of ultra-high definition are discernible, but Nobuyuki Hiruma, associate director at NHK's laboratories in Tokyo, is sure they are. "Super Hi-Vision TV is necessary to cover the ability of human vision. It is based on research into human vision."
At present, Super Hi-Vision exists only at NHK's Broadcasting Center in Tokyo, where it is projected on to a 10 meter by 5.5 meter screen, accompanied by 22 multi-layered speakers capable of replicating the sound of a concert hall.
Only 20 minutes of footage can be recorded at any one time and it has to be edited frame by frame. Even then, making a back-up takes the engineers an entire night, and after a week they have only enough material for one hour of Super Hi-Vision TV.
Sitting just three meters from a 450-inch screen, viewers often have an instant reaction to the picture. "Sometimes we suffer motion sickness," says Masaru Kanazawa, research engineer on the SHV project. These large screens would not fit in most living rooms, but Kanazawa thinks they soon might.
Hiroyuki Ohira, general manager of Pioneer's plasma development center in Yamanashi, is in charge of the same team that, in the 1990s, invented the first high-definition plasma screens. "We are trying to develop a Super Hi-Vision panel to help NHK realize its broadcast plans," he said.
The two broadcasters often collaborate on program production, most recently on the David Attenborough-narrated documentary Planet Earth which was filmed in high definition and introduced a number of new techniques.
Last November NHK had its high definition television cameras strapped to a Japan Aerospace Exploration Agency lunar probe to film an "Earth rise" over the moon in stunning detail.
The problem of how to transmit huge amounts of data remains. But NHK is using Dirac video compression technology for its Super Hi-Vision testing - a technology invented by the BBC.
Through Participate, an EU-funded project promoting public interaction with new technology, BBC engineers are getting involved in events using large outdoor screens. "Super Hi-Vision feeds nicely into that and it's definitely a long-term ambition," said Andy Bower, interim controller of the BBC Research and Innovation Centre.
Big in Japan
Mobile phonesHandsets provide mobile TV, and 50% of Japan's best-selling books were first serialized as mobile downloads.
Music playersThe Vonia sports headband, a music player for gym bunnies, uses the bones of your skull to conduct sound straight to your inner ear.
Robotics A new generation of inexpensive "amenity robots" does simple household chores.
GadgetsCyber-goggles could be the next generation in eye ware. They recognize objects in your field of vision and pop information about them up on the glass.
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