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.
Line Doublers - This device converts NTSC or 480i into 480p. Line doublers with motion-adaptive processing can to an extent turn a 30 frames/sec image into a 60 frames/sec image, thus removing some of the jerkiness and blurriness associated with motion.
First-surface mirror - Normal mirrors have the silvering on the back surface of the glass. First surface mirrors have it on the front.
4DTV - This is a DTV subscription service for C-band and Ku-band (a satellite service requiring an 8 foot dish).
SDTV - (standard definition TV) - SDTV is 480i, which is approximately the resolution of NTSC and DVDs.
Analog TV - Analog technology has been in use for the past 50 years to transmit conventional TV signals to consumers. "Standard" television broadcasts in analog TV. Analog signals vary continuously, creating fluctuations in color and brightness.
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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