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Digital television (DTV) is the transmission of television signals using digital encoding, in contrast to the earlier analog television technology which used analog signals. At the time of its development it was considered an innovative advancement and represented the first significant evolution in television technology since color television ...
Digital cable is the distribution of cable television using digital data and video compression.The technology was first developed by General Instrument. By 2000, most cable companies offered digital features, eventually replacing their previous analog-based cable by the mid 2010s.
Consequently, a digital-to-analog converter, an electronic device that connects to an analog television, must be used in order to allow the television to receive digital broadcasts. [53] The box may also be called a "set-top" converter, "digital TV adapter" (DTA), or "digital set-top box" (DSTB).
An analog cable service (known as Dejiana since 1 July 2011) continued to be broadcast, but starting on 1 April 2012, all cable providers in Japan were required to convert from analog to digital services. Most analog cable services were terminated between 24 July 2011 and April 2015. [165]
High definition—1080p (only used by a few cable operators and some terrestrial stations broadcast in 1080p) Most digital television sets sold in the U.S. use a display with a 16:9 aspect ratio to optimally display HDTV-formatted content. Lower-resolution sources like regular DVDs may be upscaled to the native resolution of the TV.
In contrast, picture quality from a digital television (DTV) signal remains good until the signal level drops below a threshold where reception is no longer possible or becomes intermittent. Analog television may be wireless (terrestrial television and satellite television) or can be distributed over a cable network as cable television.
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