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The five main ATSC formats of DTV currently [when?] broadcast in the U.S. are: . Standard definition—480i, to maintain compatibility with existing NTSC sets when a digital television broadcast is converted back to an analog one [citation needed] —either by a converter box or a cable/satellite operator's proprietary equipment
Over 480 stations were broadcasting digitally on the VHF spectrum after the transition, up from only 216 on the frequencies before. Many antennas marketed for digital TV are designed for UHF, which most digital stations use. VHF analog signals travel further than UHF signals, but watchable VHF digital signals appear to have a more limited range ...
Mobile reception of some stations will still be more difficult, because 18 UHF channels in the U.S. have been removed from TV service, forcing some broadcasters to stay on VHF. This band requires larger antennas for reception, and is more prone to electromagnetic interference from engines and rapidly changing multipath conditions.
The trial DDTV service will of current "current" 2 analogue TV channels (i.e. Modernine TV and TV3) in digital, and 2 new digital-only channels, namely MCOT 1 and ASEAN TV. Also provided under the service are seven FM radio stations in digital audio and interactive services.
This means that digital broadcasters can provide more digital channels in the same space, provide high-definition television service, or provide other non-television services such as multimedia or interactivity. DTV also permits special services such as multiplexing (more than one program on the same channel), electronic program guides and ...
Digital terrestrial TV antenna used in Indonesia. Digital terrestrial television is received either via a digital set-top box (STB), TV gateway, or more usually now, an integrated tuner in a television set, that operates on the signal received via a television antenna. These devices often now include digital video recorder (DVR) functionality. [3]
The "primary service area" is the area served by a station's strongest signal. The "city-grade contour" is 70 dBμ (decibels relative to one microvolt per meter of signal strength) or 3.16mV/m (millivolts per meter) for FM stations in the United States, according to Federal Communications Commission (FCC) regulations.
The input digital signal may be over-the-air terrestrial television signals received by a television antenna, or signals from a digital cable system. It normally does not refer to satellite TV, which has always required a set-top box either to operate the big satellite dish, or to be the integrated receiver/decoder (IRD) in the case of direct ...