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newbie question about coaxial
Posted 26 March 2009 - 07:55 AM
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Posted 26 March 2009 - 09:05 AM
America's "Everything" Pack & HD
TV1: SONY 55" KDF-55WF655; HDMI & Components connections
OTA Antenna in attic
Posted 26 March 2009 - 09:27 AM
The signal from a set-top box to the TV's tuner is normally analog video modulated onto an analog TV channel, which must be tuned by the tuner in the TV. In most cases, the modulator itself is lower quality than the source, and the analog TV tuner further lowers quality. Bypassing the modulation/tuning by using the TV's line inputs definitely improves analog picture quality.
Note that with newer TVs with digital tuners, it is possible to send TV digitally. Digital OTA (ATSC format) and digital cable (QAM) are two methods for doing so. The problem is that ATSC doesn't provide for encryption, and QAM requires a set-top box for encryption. Plus, modulators for either type are extremely expensive and far more complicated than older, analog modulators.
Posted 26 March 2009 - 09:47 AM
DISH Network uses a bandwidth allocation scheme that can even incorporate over-the-air signals with all available channels on a single coaxial cable.
The key is efficient data compression.