Compression - A method of reducing the number of bits required to store or transmit programs by the removal of redundant and/or non-critical information in the digital picture and sound. The DTV broadcasting standard for Canada, uses the MPEG-2 video and the AC-3 audio compression coding. Compression allows the delivery of more programs in a single channel.
Dolby Pro Logic Surround. This is a 4-channel analog system. During recording, the 4 channels are "folded" into 2 stereo channels. If played back without a Pro Logic decoder, it sounds like normal stereo. This format is becoming obsolete.
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.
Interlaced scan - Historically, TV CRTs are interlaced, while computer CRTs are not. Interlaced means that the electron beam skips every other horizontal line, filling in the missing lines on the next pass. A frame is composed of 2 fields. One field is all of the odd numbered lines, and the other field is all of the even numbered lines.
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.
Progressive scan - This is the opposite of interlaced scan.
Virtual channel number - This is the channel the consumer thinks he is watching. The actual (physical) channel is selected by a hidden mechanism.
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