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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. HDTV has quickly become the standard, with about 70% of all TVs used being HD as of 2015.〔(HDTV SETS NOW IN OVER 80% OF U.S. HOUSEHOLDS ) ''Leichtman Research Group'' March 16, 2015〕 In the US, the 720p and 1080i formats are used for linear channels, while 1080p is available on a limited basis, mainly for pay-per-view and Video on Demand content. ==From proposals to introduction== The Federal Communications Commission (FCC) began soliciting proposals for a new television standard for the U.S. in the late 1980s and later decided to ask companies competing to create the standard to pool their resources and work together, forming what was known as the Grand Alliance in 1993. On July 23, 1996, WRAL-TV (the CBS affiliate in Raleigh, North Carolina) became the first television station in the United States to broadcast a digital television signal.〔(History of WRAL Digital )〕 HDTV sets became available in the U.S. in 1998 and broadcasts began around November 1998. The first public HDTV broadcast was of the launch of the space shuttle Discovery and John Glenn's return to space; that broadcast was made possible in part by Harris Corporation.〔 〕 The first commercial broadcast of a local sporting event in HD was during Major League Baseball's Opening Day on March 31, 1998, the Texas Rangers against the Chicago White Sox from The Ballpark in Arlington in Arlington, TX. The telecast was produced by LIN productions and broadcast locally on Fort Worth, Texas NBC affiliate KXAS channel 5. This telecast was also the first commercial HD broadcast in the state of Texas.〔(KXAS Texas Rangers vs Chicago White Sox introduction – March 31, 1998 )〕 The first major sporting event broadcast nationwide in HD was Super Bowl XXXIV on January 30, 2000. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「High-definition television in the United States」の詳細全文を読む スポンサード リンク
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