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There are but few techniques of viewing big sized pictures (taken with the high-resolution digital cameras, which matrix have a large number of megapixels) in their full worth. If there is really convenient one. High-definition TVs with big resolution screens are among rare instrumentation for this seemingly primitive task. This FAQs was borrowed from Sony Bravia high-definition TVs manual.
Analogue TV is transmitted in a similar way to radio and as such is prone to interference, ghosting and snow. Digital TV, on the other hand, is transmitted as a stream of 1s and 0s and is much less prone to interference. It can also support new developments such as true widescreen pictures, surround sound and high definition resolution.
A product can be labelled HD Ready when it complies with the following requirements: • The minimum native resolution of the display is 720 physical lines in wide aspect ratio. • The display device accepts HD input via: Analogue YPbPr (Component) , and DVI or HDMI • HD capable inputs accept the following HD video formats: 1280x720 @ 50 and 60Hz progressive (“720p”), and 1920x1080 @ 50 and 60Hz interlaced (“1080i”) • The DVI or HDMI input must support High-bandwidth Digital Content Protocol (HDCP)
There are two different ways of displaying video signals. The most advanced one is progressive, where the display screen refresh happens by writing the screen content in one shot. While interlaced typically will write the screen content in two phases: first the even lines and then the odd lines. This might result in a jagged image when there’s a lot of moving objects on the screen.
HDCP stands for High-bandwidth Digital Content Protocol. This encryption method is used to protect the digital video signal that is transferred between the output device (DVDplayer, set-top box) and the display.
Composite is the typical yellow plug that is used for SD video
transfer. These video signals typically merge the chrominance
& luminance into one signal.
Luminance (Y) and Chrominance (C) remain separated with
S-Video (Y/C) , resulting in improved picture quality.
Component video keeps the Red/Green/Blue component video
signals strictly separated resulting in the best picture quality
for analogue signals and, unlike composite or S-Video, is
capable of carrying HD signals.
HDMI stands for High Definition Multimedia Interface. This
interface bundles uncompressed digital video AND digital audio
into one cable. The video part is compatible with HDCP.
HDMI is the digital equivalent of the SCART lead and is likely to
become the de-facto standard for connecting HD equipment.
Some examples: practically all digital stills cameras can
provide HD content as they normally have a resolution higher
than 2 Mega pixels. There are HD broadcast cameras available
to shoot directly into 1080i (HDV and XDCAM).
Sony HDV Handycam camcorders bring HD to the home
camcorder market and, of course, the consumer TV sets
.
Sony VAIO laptops, Sony Playstation 3 and Blu-ray discs also
form a key part of Sony’s HD product group.
The most familiar product is probably the Blu-ray player which hasn’t been commercially released yet in Europe. Several broadcasters across Europe have launched HD services.
As HD content needs much more data space than is currently
available on DVD, a new technology is required to carry this
huge amount of data.
Right now, there are 2 technologies in the running – Blu-ray
& HD-DVD.
The advantages of Blu-ray are that it can contain more data
(Double layer capacity is already 50Gb, and multiple layers are
planned in the future).
Some companies are likely to support both technologies.
This is a high definition recording format for storing high-resolution images on DVDs, hard disks and Memory Stick cards, which was introduced by Sony. DVDs recorded in AVC HDFormat can be played in high resolution on Blu-ray players and the PS3.
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