Advanced Television Systems Committee

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Digital broadcast standards worldwide

Advanced Television Systems Committee ( ATSC for short ) is an American organization that sets standards for digital television . It was founded in 1982 as part of the Advanced Television Committee and is based in Washington, DC

The standards of the ATSC include specifications for high-definition digital television ( HDTV ), EDTV and poor quality standard digital television ( SDTV ).

Standards

The ATSC standard is intended to replace the American NTSC television system. The HDTV standards under the umbrella of the ATSC standard reproduce 16: 9 images with a maximum resolution of 1920 × 1080 pixels, which is almost six times higher than the old NTSC standard (640 × 480/720 × 486). However, there are many more resolutions listed in this standard. Six SDTV channels, or one HDTV channel and four SDTV channels, can be transmitted on a 6 MHz wide television channel.

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ATSC is the North American counterpart to the DVB-T standard. All major metropolises in America have meanwhile switched to ATSC, but the analogue broadcasting systems continue to broadcast in simulcast mode , since the poorer sections of the population, who make up the majority of terrestrial viewers, do not want to switch off the television signal overnight. NTSC analog television broadcasts were due to cease on February 17, 2009. With the DTV Delay Act , which came into force on February 11, 2009 , the date was postponed to June 12, 2009. This only applies to terrestrial transmissions. Cable and satellite transmissions are not affected by this measure.

Modulation method

The ATSC standard uses the following profiles:

  • 08-VSB : 19.39 Mbit / s (terrestrial) 6 MHz bandwidth .
  • 16-VSB : 38.78 Mbit / s (cable) 6 MHz bandwidth.

Refresh rates

Depending on the quality, the frame rate varies between 24 frames (SDTV) and 60 frames per second (HDTV).

0640 × 480 (4: 3 SDTV) interlaced0 0 29.97 (59.94 frames / s) 30 (60 fps) progressive 23.976 24 29.97 30th 59.94 60
0704 × 480 (4: 3 or 16: 9 SDTV) interlaced 0 0 29.97 (59.94 frames / s) 30 (60 fps) progressive 23.976 24 29.97 30th 59.94 60
0720 × 480 (4: 3 or 16: 9 SDTV) interlaced 0 0 29.97 (59.94 frames / s) 30 (60 fps) progressive 23.976 24 29.97 30th 59.94 60
1280 × 720 0(16: 9 HDTV) progressive 23.976 24 29.97 30th 59.94 60
1920 × 1080 (16: 9 HDTV) interlaced 29.97 (59.94 frames / s) 30 (60 fps) progressive 23.976 24 29.97 30th

Image formats

Common video resolutions

The following image formats are supported:

SDTV

  • 480i60, 480p30 (NTSC)

EDTV

  • 480p60

HDTV

  • 720i60
  • 720p 24, 720p30, 720p60
  • 1080p24, 1080p30
  • 1080i 60

Web links

Footnotes

  1. ↑ DTV Delay Act: http://thomas.loc.gov/cgi-bin/bdquery/z?d111:SN00352:@@@X