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(Digital TeleVision) Transmitting TV using digital signals. The major DTV standards are ATSC (North America), DVB (Europe) and ISDB (Japan). All three use MPEG-2 video compression and Dolby Digital audio compression. DVB and ISDB also include MPEG audio compression (see DVB and ISDB).

The FCC approved ATSC in 1996 (see ACATS), and the U.S. switched to digital broadcasting in June 2009 (see digital TV transition). Other countries have also adopted the ATSC format, including Canada, Mexico and South Korea.

A Digital TV or a Set-Top Box
To receive a DTV program requires a digital TV set or a digital set-top box for an analog TV. However, digital TV sets may continue to have analog inputs for many years, because people have huge collections of VHS movies and recordings.

Eighteen DTV Formats
DTV offers 18 digital formats (see table below) starting with Standard Definition (SD), the digital counterpart of the NTSC analog standard, except without snow and ghosts. High Definition (HD) provides 5.1 Dolby Digital Surround Sound and requires a wide screen TV set (16:9) in order to eliminate the letterbox effect.

The numerous options provide the broadcaster with a tradeoff between how many channels can be sent versus channel quality. The more HD channels, the fewer ED and SD channels, and vice versa. See digital TV transition, TV converter box, HDTV, letterbox, NTSC, 8-VSB, interlace, digital cable and cliff effect.

   p = progressive scan (non-interlaced)   i = interlaced                          FrameResolution    Aspect  Rate    Pixel    Horiz x Vert  Ratio   (fps)   Shape HDTV - High Definition TV

  1. 1920 x 1080   16:9    24p   Square
  2. 1920 x 1080   16:9    30p   Square
  3. 1920 x 1080   16:9    30i**   Square

  4. 1280 x  720   16:9    24p   Square
  5. 1280 x  720   16:9    30pSquare
  6. 1280 x  720   16:9    60p**   Square

 EDTV - Enhanced Definition TV - 480p

  7. 704 x  480   16:9     24p     Rect
  8. 704 x  480   16:9     30p     Rect
  9. 704 x  480   16:9     60p**   Rect

 10. 704 x  480    4:3     24p     Rect
 11. 704 x  480    4:3     30p     Rect
 12. 704 x  480    4:3     60p**   Rect

 13. 640 x  480    4:3     24p     Square
 14. 640 x  480    4:3     30p     Square
 15. 640 x  480    4:3     60p     Square

 SDTV - Standard Definition TV - 480i

 16. 704 x  480   16:9     30i     Rect
 17. 704 x  480    4:3     30i**   Rect
 18. 640 x  480    4:3     30i     Square

 ** most popular formats

      720 x 480 x 30 fps (NTSC)
      720 x 576 x 25 fps (PAL/SECAM)
       Only 704 of the 720
        horizontal pixels are visible.

  D1 Broadcast Format
      720 x 486 x 30 fps (NTSC)
      720 x 576 x 25 fps (PAL/SECAM)

The 4:3 aspect ratio on standard TV and computer screens (left) is more square than the 16:9 ratio of wide screen sets (right). (Image courtesy of Intergraph Computer Systems.)
References in periodicals archive ?
He said: "We tried out damnedest to make it a special entertainment but I'll admit I'm a contributor to the decline in TV standards.
In an interview with Radio Times said: 'We tried our damnedest to make it a special entertainment but I'll admit I'm a contributor to the decline in TV standards.
While there is widespread agreement that a move to digital television will be a major quality improvement over the current analog TV standard, computer and software companies urged the FCC to adopt a less rigid approach that would result in superior quality standard digital television with less delay and at a substantially lower cost to consumers than the proposal before the FCC.
NMI") is a fabless semiconductor company that develops and sells highly integrated solutions for major broadcast and cable TV standards.
Development of other mobile TV standards such as TMMB and DAB has been limited due to lack of support, and the analog mobile TV market has reached its peak and is will be outplayed by CMMB.
This is made possible, thanks to our new programmable platform Octopus which gives the fastest time to market, for any of the TV standards used around the World", said Yannick Levy, CEO of DiBcom.
Current status of network deployment, and business structures and models of T-MMB and CMMB mobile TV standards
Movies like this are all about the gore, and on that level, ``Saint Sinner'' does OK by TV standards.
Production values verge on cinematic by TV standards - the pilot is shot in evocative amber hues, the special effects are effective, and the autopsy sequence is pretty gnarly.
By network TV standards, it's an adventurous and potentially intriguing premise, with the bonus of a good cast.
This report examines the evolution of mobile TV standards in China, the current state of development of mobile TV service and content providers, and the outlook for the future.