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HD TECHNOLOGY EXPLAINED


HD or High Definition is the new generation of display device, most usually used in the sense of HDTV. With the ever increasing data transfer rates afforded by cable technology what was once a dream in now becoming reality with a number of HD channels already available here in the UK from the BBC & Sky. HD essentially involves improving the resolution that images are viewed at which means better, clearer pictures.

Standards for HD dictate that the minimum native resolution of the display is 720 physical lines in wide aspect ratio. (This is compared with 576 visible lines in old style STANDARD DEFINITION displays.) In the world of computers & projection technology a line equates to a line of pixels and therefore an HD projector will have a native resolution of 1280 x 720 (progressive) or 1920 x 1080 (interlaced). It should be able to display these at both 50Hz & 60 Hz.

The required input formats for HD are as follows:

Analog YPbPr (Component Video)

DVI ( with HDCP) or HDMI (with HDCP)

Some Definitions:

HD vs HD Ready - HD devices have a built-in tuner whereas HD Ready devices require an external tuner. HD Ready devices offer only to meet a minimum specification and are generally not true HD display devices.

DVI - Digital Video Interface

HDMI - High Definition Multimedia Interface. HDMI is the latest standard connector designed for digital TV. Unlike DVI the connector also carries audio.

HDCP - High-bandwidth Digital-Content Protection

Progressive vs Interlaced - These are the types of video scan used to create the images onscreen. A progressive video scan involves scanning (displaying) the image each line at a time from top to bottom. Interlaced scanning (as used in CRT display devices) invloved splitting the lines onscreen into two "fields", where alternate lines belong to different fields. The first field in written, followed by the second field which then completes the "frame". The reason for using interlaced scanning is that it provides far reduced flicker at any given frequency of scan. In older equipment this was an issue. Modern equipment uses Interlaced video as a form of compression as it can approxiamately half the data transfer rate required.

HDV - High Definition Video - More generally used in cameras which are recording to HD standards.

REAL LIFE USAGE


HDTV is now coming online and HD technology does offer a great image quality. It is worth carefully considering whether buying an HD Ready unit will actually meet your full future requirements, although it will offer an improvement over SDTV.

We have range of HD equipment in our hire & demo stock. Please call or email us for further details.

We'll be happy to hire, demonstrate our HD stock. Please call or email for current purchase price. Current hire prices are shown below.

Samsung DVD-HD860High Definition (HD) DVD player. Can convert standard DVD image quality to High-Definition level. HDMI output, upscaling, etc.£10.00£30.00
22" LCD HD Monitors (Portrait Capable) Various makes and models of video monitor with HDMI, DVI-D, DVI-I, VGA and other inputs. Portrait capable monitors available.£15.00£45.00
Digital View Viewstream 500 Solid State Media PlayerSolid state alternative to Bluray etc. Plays MPGs, jpgs etc and can be scheduled. Outputs HD HDMI, composite and component video plus VGA. £25.00£75.00
BLACKMAGIC HDLink Pro HDSDI - DVI / HDMI convertor2 SDI in / out with DVI-d or HDMI output plus 6ch audio. Up to HD and 2k resolutions.£30.00£60.00
Datapath X4 Video Wall ControllerSplit a Dual-Link or Single-Link DVI input signal across 4 x DVI or Analog RGB outputs. £40.00£120.00
Kramer VP-728 9-Input ProScale Presentation Scaler/SwitcherThe VP-728 is a 9-input scaler/switcher for analog and digital video, unbalanced stereo, and S/PDIF audio signals. It scales any video signal composite, s-Video (Y/C), component video (YUV), HDMI, computer graphics video and JPEG files) up or down to a selectable graphics or HDTV output resolution via HDMI or 15-pin HD outputs. It provides glitch-free switching between sources through FTB (fade-thru-black) switching technology.£80.00£240.00
Sony HXR-MX2000 HD Solid State CamcorderFull HD solid state camcorder. £100.00£300.00
Canon XEED SX6 SXGA+ Resolution Projector3500 lumen high resolution (1400 x 1050) LCOS projector. Amazing quality, 4x3 aspect ratio, better than HD quality.£200.00£600.00
Canon XEED WUX10 Projector - WUXGA / (Beyond) Full HD LCOS ProjectorFull HD projector - industry-leading WUXGA resolution (1920 x 1200 pixels), the XEED WUX10 projects widescreen computer images and Full HD video (1080p) at 3200 lumens making it ideal for business and specialised AV use.£250.00£750.00
Catalyst / Pixelmad Media Server (64 Bit Mac Pro)Professional Media Server with Pixelmad, for running multiple video screens from a DMX lighting desk, midi controller or custom presets. LFG4 and Blackmagic Intensity Pro capture cards. 32 layers, 16 mixes supporting up to 6 unique screens of content which can be manipulated in realtime. Flightcased with a UPS.£400.00£800.00
Sanyo PLC-HF15000 - 2K resolution (Beyond HD), 15000 lumen, Quad Drive LCD projector.Beyond HD LCD projector (2K Resolution). 17x10 aspect ratio. 15000 ANSI lumens. Quad Drive (4 x LCD Colour Panels). Hot Swap Lamp System. Full range of lenses available. This model is also sold as the CHRISTIE L2K1500 / EIKI HDT2000.£1,200.00£3,000.00

For more info on the Canon XEED SX50 Projector click here


MORE INFO

For more detailed info on HD, HDTV & HDV click here for wikipedia defintion



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