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2. High-definition television in the United States - Wikipedia

   en.wikipedia.org/wiki/High-definition_television...

   High-definition television (HDTV) in the United States was introduced in 1998 and has since become increasingly popular and dominant in the television market. Hundreds of HD channels are available in millions of homes and businesses both terrestrially and via subscription services such as satellite , cable and IPTV .

3. High-definition television - Wikipedia

   en.wikipedia.org/wiki/High-definition_television

   The term high definition once described a series of television systems first announced in 1933 [ 1] and launched starting in August 1936; [ 5] however, these systems were only high definition when compared to earlier systems that were based on mechanical systems with as few as 30 lines of resolution.

4. Digital television in the United States - Wikipedia

   en.wikipedia.org/wiki/Digital_television_in_the...

   High definition—1080i; 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 ...

5. Digital television transition in the United States - Wikipedia

   en.wikipedia.org/wiki/Digital_television...

   The digital transition in the United States was the switchover from analog to exclusively digital broadcasting of terrestrial television programming. According to David Rehr, then president and CEO of the National Association of Broadcasters , this transition represented "the most significant advancement of television technology since color TV ...

6. Television in the United States - Wikipedia

   en.wikipedia.org/.../Television_in_the_United_States

   In the United States, television is available via broadcast (also known as "over-the-air" or OTA) – the earliest method of receiving television programming, which merely requires an antenna and an equipped internal or external tuner capable of picking up channels that transmit on the two principal broadcast bands, very high frequency (VHF) and ultra high frequency (UHF), to receive the ...

7. Digital television - Wikipedia

   en.wikipedia.org/wiki/Digital_television

   Digital television. 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 ...