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You should already know the U.S. plan to replace our current system of interlaced analog TV (NTSC), dating back to 1940 with a digital system of digital television by February 17, 2009. Surprising that the idea started as “analog” HDTV General Instrument proposed an all-digital system in 1990.

The DTV standard is composed of 18 digital formats grouped into two levels of quality, as approved by the ATSC (American Television Systems Committee) in 1995:

1) SD: Standard Definition, with 480i / p (i: interlaced, p: progressive) viewable horizontal lines of vertical resolution (lines from top to bottom), each row with a maximum of 704 total pixels of horizontal resolution (counted from left to right), and with an aspect ratio (width / height units) of 4×3 (like normal TV) or 16:9 widescreen.

2) HD: High Definition, with 720p and 1080i / p viewable horizontal lines of vertical resolution (lines from top to bottom), each row, with respectively 1280 (720p) or 1920 (for the 1080i / p) total pixel horizontal resolution (counted from left to right), and only 16×9 widescreen aspect ratio.

Note that because it is not complex enough, the horizontal lines (rows) are “vertical” resolution (480, 720, 1080), and the vertical columns made of pixels aligned on the horizontal lines are “horizontal” resolution (704, 1280 , 1920).

DTV has been 15 years in production before the launch on air in November 1998. HDTV is part of the quality of DTV, but its application is not mandatory, the SD. Use the term only discuss the DTV digital television system in general.

Later, in 2000, the Consumer Electronics Association (CEA), presumably to help customers confused, has created another level of resolution between the two: DE (better definition).

This promotion of SD to 480p ED level, leaving only the 480i in the level of SD. Has also given to any TV the right to be labeled HDTV if you can only see 810th lines of vertical resolution of the displayed image, rather than 1080i.

We can discuss how the intervention of the CEA has helped more consumers who have helped the producers to get rid of mediocre games. But it was when CRT-based digital television sets have been the strength of the market, today most DTV sets are fixed pixel displays and their resolution is clearly specified as a number of pixels in both directions.

Our knowledge of current NTSC over-the-air (OTA) TV system is 480i analog interlaced (actually 525th to 480th visible horizontal lines of vertical resolution). The regular channels of digital satellite and digital cable could be compared to SD digital TV broadcasts digital, but also transmit dozens of channels in high definition.

To facilitate the transition, broadcasters were given one extra channel slot of the FCC simulcast analog and digital versions of their programs. This is an important investment for television stations to build a DTV facility with new cameras, production equipment, etc.

When digital television is fully implemented, broadcasters must return one of two analog channels on-the-air transmission stops, and the current analogue TV sets, video recorders, TiVo with analog tuners would stop tuning, but also (but will continue to function as a display device, if fed with an analog signal converter from 480th, VHS, DVD, etc.). This date was originally scheduled for January 2007 but was extended until February 17, 2009. Once the DTV is implemented, the FCC will auction the spectrum of waves.

Most TV stations already broadcast over the air digital terrestrial TV SD and HD widescreen and consumers buying high definition televisions at a faster pace each year.

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