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60 USING SkyHD
HD JARGON-BUSTER
HD jargon-buster
DVI Digital Video Interface. Provides high-bandwidth digital connection between a video source and a TV. Audio
is carried separately.
A High Definition Multimedia Interface is like a High Definition scart cable, a high-bandwidth digital connection for both
video and audio. ensures the best video signal is sent from the source (HD signal) to the display (LCD, Plasma,
DLP). It does this by sending uncompressed video and multi-channel audio to the TV through one single cable.
HDCP High bandwidth Digital Content Protection (HDCP) is a copyright protection system that is included in HD TVs and
receivers. It prevents unauthorised duplication and distribution of copyrighted content.
HD READY HD ready is a labelling scheme being introduced by the European TV manufacturers’ organisation EICTA to help you
choose an HD TV. The HD ready logo will appear on an increasing number of TVs in the shops. Sky’s HD service is
designed to work with TV sets that carry the HD ready label. So look for the logo to make sure you’re ready for HD.
HD TV HD TV (High Definition television) provides a higher quality display with a vertical resolution display from 720p to 1080i.
These rates translate into a frame rate of up to 50 frames per second; twice that of conventional TV. HD TV pixel
numbers range from one to two million, compared with SD TV’s range of 300,000 to one million. As for audio, HD TV
receives, reproduces, and outputs Dolby
®
Digital 5.1 audio. This HD TV designation means that the set has an internal
digital tuner/decoder, as well as meeting HD TV widescreen specifications. HD TV sets display in 1080i/720p.
INTERLACED SCANNING With interlaced scanning, a display shows all the odd lines at one scan of the screen and then all the even lines in a
second scan of the screen.
PIXEL Pixel is the abbreviation for “picture element”. Pixels are the smallest bits of data in a video image. The more pixels
there are in an image, the greater the resolution.
PROGRESSIVE SCANNING Progressive scanning is based on the principle that all the horizontal scan lines are ‘painted’ on the screen in one pass.
720 or 1080 horizontal lines are scanned progressively or in succession in a vertical frame. This is repeated 50 times
a second. Some displays, for example LCD and plasmas scan progressively, whilst CR
Ts in TV sets usually scan using
interlaced lines.
720p 720p means the vertical resolution of the TV picture is 720 lines. ‘p’ refers to progressive scanning.
1080i 1080i means the vertical resolution of the picture is 1080 lines. ‘i’ refers to interlaced scanning.
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