HDTV - High Definition Television - HDTV is a TV system having approximately twice the vertical and horizontal picture resolution of today's NTSC TV and having a wide aspect ratio of 16 - 9. Two HDTV formats are currently in use; (a) 1920 pixels per line and 1080i lines per frame and (b) 1280 pixels per line and 720p lines per frame. HDTV can be recognised by its spectacular picture resolution, freedom from annoying artefacts and impressive 5.1 channel surround sound.
LCOS - (Liquid Crystal On Silicon) - This is another contender to replace CRTs in projection TVs.
OAR - (original aspect ratio) - Also called Letterbox format, OAR means that none of the image is clipped or squeezed. Unused parts of the screen are usually black.
D/A - Conversion of digital signals to analog signals. Most set-top boxes decode the digital signals broadcast and then convert them to analog signal for interconnection to the display device.
EDTV - (enhanced definition TV) - Essentially DVD quality, it is a small step up from NTSC. An EDTV will convert all 18 ATSC formats to 480p.
S-Video Connection - A method to interconnect video devices (such as a DVD player and the analog television) by sending the two signals luminance (Y) and an encoded color difference signal (C). The S-Video connection is made using a cable terminated in a small 4-pin connector (in some cases a 7 pin connector is used on computers to allow inclusion of an NTSC composite signal). S-video can greatly improve the picture when connecting SDTV or NTSC displays to a high quality video source such as DVDs.
EDTV - This acronym stands for "Enhanced Definition Television." It refers to a complete products/system with at least a digital receiver display scanning format, and Dolby Surround Sound audio output capabilities.
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