OTA - (over the air) - There are about 1500 OTA (terrestrial) TV stations in the U.S.
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.
Multipoint convergence - Projection TVs with 3 CRTs require periodic adjustment to keep the 3 images perfectly aligned. Typically this is a simple 5 minute procedure the consumer must do every month or so.
Set-top Converter Box - This unit sits on top of the viewer's analog TV, receives the Digital TV signal, converts it to an analog signal, and then sends that signal on to the analog TV.
COFDM modulation technique. This technical standard has been used in Europe and other places for digital TV. 8VSB is used in the U.S.
Interlaced Scanning - This process divides and presents each video frame as two fields. Imagine a video frame being divided by the odd and even horizontal lines that make up the picture. The first field presents the odd lines; the second field represents the even lines. The fields are aligned and timed so that, with a still image, the human eye blends the two fields together and sees them as one. Motion in the image makes the fields noticeable. Interlace scanning allows only half the lines to be transmitted and presented at any given moment.
Interactive Television - This is when TV programming features interactive content and enhancements, blending traditional TV viewing with the interactivity of a personal computer.
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