The High Definition Television

The expansion of hdtv is High-definition television. The hdtv means television signals broadcast with a higher resolution than standardused to refer to television standards developed in the 1930s to replace the early experimental systems, even though, not so long afterwards, Philo T. Farnsworth, John Logie Baird and Vladimir Zworkin had every developed competing TV systems but resolution was not the problem that separated their substantially distinct technologies. It was patent interference lawsuits and deployment problems given the tumultuous financial climate of the late 20's and 30's. Most patents were expiring by the end of WW2 leaving the marketplace wide open and no worldwide standard for television agreed upon. The world utilized analog PAL, NTSC, SECAM and other standards for over half a century.

The terms HD ready and HD compatible are being utilized around the industrial world for marketing purposes. They indicate that a TV or display is able to accept video over an HDMI connection, utilizing a new connector design, the primary purpose of which appears to be to ensure that digital video is only passed over an interface which, by agreement, incorporates copyright protection. Even HD-ready sets do not necessarily have sufficient pixels to display video to the 1080-line (1920x1080) or 720-line (1280x720) HD standards in full resolution with out interpolation, and HD-compatible sets are usually just standard-definition sets with an HDMI input. This is really a confusing use of the terms HD and hdtv.

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

Japan has the earliest working hdtv system still in use, with design efforts going back to 1979. Japan began broadcasting analog hdtv signals within the early 1990s utilizing an interlaced resolution of 1035 lines (1035i). The Japanese MUSE (Multiple sub-nyquist sampling Encoding) system, developed by NHK Science and Technical Study Laboratories (STRL) inside the 1980s, employed filtering tricks to reduce the original source signal to decrease bandwidth utilization.

Japan is forerunner of hdtv within the world. Japan terrestrial broadcast of HD via ISDB-T started in December 2003.

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

CHUM Limited's Citytv in Toronto was the 1st hdtv broadcaster in Canada and CBC (Canadian Broadcasting Corporation) officially launched hdtv programming on March 5, 2005.

Mexican television business Televisa experimented hdtv broadcasts within the early 1990s, in collaboration with Japan's NHK.

The hdtv specifications are defined by the ATSC within the United States. An hdtv-compatible TV generally uses a 16:9 aspect ratio display with an integrated ATSC tuner. Lower resolution sources like regular DVDs might be upscaled to the native resolution of the TV.

The hdtv services had been made obtainable inside the Republic of Korea in 2005 and Brazil is expected to go for it in 2006.

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