HDTV-high resolution television

The expansion of hdtv is the high-definition television. Hdtv broadcast television signals means with a higher resolution than traditional formats such as NTSC, SECAM, PAL. Hdtv is broadcast digitally, except for early analog formats in Europe and Japan.

Historically, the term high-definition television was also used to refer to television standards developed in the 1930s to replace early experimental systems, although not so long after, Philo t. Farnsworth, John Logie Baird and Vladimir Zworkin had each developed competing TV systems but the resolution was not the problem separating their technologies substantially different. It was patent interference lawsuits and deployment issues, given the tumultuous financial climate of the late 1920s and ' 30s. The majority of patents were expiring at the end of WW2, leaving the market wide open and no worldwide standard for television agreed. The world used analogue PAL, NTSC, SECAM and other standards for over half a century.

The term HD compatible HD ready and in the industrial world are used for marketing purposes. They indicate that a TV or display is able to accept the video on an HDMI connection, using a new design of the connector, whose main purpose is to ensure that digital video is only spent on an interface thatwith an agreement, incorporating the copyright protection. Also HD ready set aren't necessarily enough pixels to display the video in 1080-line (1920 x 1080) or 720-line (1280 x 720) standard in full resolution HD without interpolation, compatible HD set and are often only standard definition sets with an HDMI input. This is a confusion of terms use of hdtv and HD.

MPEG-2 is most commonly used as the compression codec for digital hdtv broadcasts. Hdtv is capable of "Theater quality" audio because it uses the Dolby Digital (AC-3) to support "5.1 surround 1. "

The first Japan has working hdtv system still in use, with design efforts going back to 1979. Hdtv broadcasting analog signals on Japan in the 1990s began with a resolution of 1035 interlaced lines (1035i). The Japanese Muse (Multiple sub-nyquist sampling Encoding) system, developed by NHK Science & Technical Research Laboratories (STRL) in the 1980s, employed filtering tricks to reduce the original source signal to decrease bandwidth usage.

The Japan is the precursor of hdtv throughout the world. Terrestrial broadcasting in Japan of HD via ISDB-T started in December 2003.

The broadcast hdtv in Europe began in 2004. Euro1080-is the pioneer in hdtv broadcasting in Europe. Australia has started broadcasting HD in January 2001.

CHUM Limited's Citytv in Toronto, was the first hdtv broadcaster in Canada and CBC (Canadian Broadcasting Corporation) officially launched hdtv programming on March 5, 2005.

The Mexican Televisa television company experienced hdtv broadcasts in the 1990s, in collaboration with Japan's NHK.

Specifications are defined by ATSC hdtv in the United States. An hdtv compatible television usually uses a display 16: 9 aspect ratio with an integrated ATSC tuner. Lower-resolution sources like regular DVDS can be upscaled to the native resolution of the TV.

Hdtv services were made available in the Republic of Korea in 2005 and Brazil is expected to go for it in 2006.

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