What Is High Definition Television And What Do I Need To Know-kamikaze love

UnCategorized High-definition television (HDTV) has a higher resolution than conventional television (known as standard-definition TV, or SDTV). HDTV is a digitally broadcast system and consequently uses less bandwidth than traditional analogue systems. The less the bandwidth then the easier and almost certainly faster it is to deliver the data or picture to your TV set. There have been several predecessors to the now current HDTV and any concept of high definition is relative to existing systems. The system we now have was in fact first broadcast publicly in 1997 by CBS in the USA. The HDTV we have implemented today is based on the ATSC HDTV standards (the American Advanced Television Systems .mittee) for North America and the DVB HDTV for South America, Africa, Europe and parts of Asia. The key factors which define the bandwidth and hence the eventual quality of a digital picture is:- 1. The number of pixels on a screen. There are many technical issues defining the standards but in layman’s terms there are really 2 HDTV resolutions and they are 1280 x 720 (just under 1 million pixels) or 1920 x 1080 (just over 2 million pixels). The bigger your screen then the more likely that you’ll have the 2 mega-pixel resolution. 2. The number of frames per second to be displayed. Again there are different technologies providing different definitions but put simply HDTV frame rates are 25 frames per second or 30 frames per second. 3. The data .pression or video .pression algorithms used are now the Mpeg-2 and Mpeg-4 standards. There are .mon standards for the .pression (and subsequent reverse of the .pression) which can be ac.modated on some chip or small card. .pression simply means that there are some clever formulae which remove the necessity to store each pixel for each frame. If for example we record the changes from one frame to another then we’d have some form of .pression. There are many sources of pictures to display on an HDTV set and they are:- A. – The cable providers broadcast some of their programs in HD mode. This sort of evolved from the cable suppliers first delivering analogue only services and then digital and now some HD broadcasts as part of the total package. B. – Over the air HD broadcasts. An HD ready HDTV will include the necessary equipment to receive these signals with a suitable HDTV antenna or aerial. A standalone set top box can be used in the event of the TV not having a suitable receiver. C. – Satellite TV .panies usually have an upgrade or premium service which includes a number of HD channels. D. – .puter games – such as the Xbox 360 and PlayStation 3 have an HD output. We also now have Satellite TV for PC cards and adapters starting to hit the market. These internet HDTV cards enable media that was originally broadcast by satellite to be transmitted via the internet to your desktop. Satellite TV to PC and My New Satellite TV are .panies providing these products and claim to access up to 3,000 satellite HDTV channels E. – Finally the new Blu-Ray disks and Blu-Ray players are effectively an HD version of the current DVD disks and players and will enable you to play movies in full HD mode on your HDTV. Before you buy an HDTV check-out HDTV reviews and find any FAQ HDTV or HDTV FAQ pages to get the most up to information before spending your money on the best HDTV you can afford. Just browsing through the full manufacturer’s specification will enable you to ensure you have the HDTV features that you require. If you are specifically looking for a small TV then try looking for – best small HDTV review and similarly for best large HDTV review. You may also wish to take a look at a Satellite TV guide. If you have a specific allegiance to a manufacturer then you could for example search specifically for Sony HDTV review or Samsung HDTV or similar. About the Author: 相关的主题文章: