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2. High-definition television - Wikipedia

   en.wikipedia.org/wiki/High-definition_television

   High-definition television (HDTV) describes a television or video system which provides a substantially higher image resolution than the previous generation of technologies. The term has been used since at least 1933; [ 1 ] in more recent times, it refers to the generation following standard-definition television (SDTV).

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

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

   Currently, HD programming is carried by all major television networks in nearly all DMAs, including ABC, CBS, NBC, FOX, PBS, The CW, MyNetworkTV, Telemundo, Univision, and UniMás; and on many independent stations. All but a select few of cable networks offer an HD broadcast to cable and satellite companies.

4. Ultra-high-definition television - Wikipedia

   en.wikipedia.org/wiki/Ultra-high-definition...

   Both Rec. 2020 and Rec. 709 use Illuminant D65 for the white point. Ultra-high-definition television (also known as Ultra HD television, Ultra HD, UHDTV, UHD and Super Hi-Vision) today includes 4K UHD and 8K UHD, which are two digital video formats with an aspect ratio of 16:9. These were first proposed by NHK Science & Technology Research ...

5. List of digital television deployments by country - Wikipedia

   en.wikipedia.org/wiki/List_of_digital_television...

   Today, the vast majority of events and programs are broadcast in high definition. Currently almost all the cable providers as well as SKY the major DTH provider offer HD channels. By the third quarter of 2005, HDTV transmissions from TV Azteca were available in Mexico's largest markets: Mexico City, Guadalajara and Monterrey.

6. List of United States over-the-air television networks

   en.wikipedia.org/wiki/List_of_United_States_over...

   NBC. CBS. ABC. Fox. The CW. PBS. The five major commercial broadcast television networks, along with PBS. In the United States, for most of the history of broadcasting, there were only three or four major commercial national terrestrial networks. From 1946 to 1956, these were ABC, CBS, NBC and DuMont.

7. Digital television transition in the United States - Wikipedia

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

   12 June 2009 - final hours of analog broadcast on WWL-TV gave information about websites and telephone numbers for more information about transition. The digital transition in the United States was the switchover from analog to exclusively digital broadcasting of terrestrial television programming.