ATSC standards

"ATSC" redirects here. For other uses, see ATSC (disambiguation).

Advanced Television Systems Committee (ATSC) standards are a set of standards for digital television transmission over terrestrial, cable, and satellite networks. It is largely a replacement for the analog NTSC standard, and like that standard, used mostly in the United States and Canada. Other former users of NTSC, like Japan, have not used ATSC during their digital television transition.

The ATSC standards were developed in the early 1990s by the Grand Alliance, a consortium of electronics and telecommunications companies that assembled to develop a specification for what is now known as HDTV. The standard is now administered by the Advanced Television Systems Committee. The standard includes a number of patented elements, and licensing is required for devices that use these parts of the standard. Key among these is the 8VSB modulation system used for over-the-air broadcasts.

ATSC includes two primary high definition video formats, 1080i and 720p. It also includes standard-definition formats, although initially only HDTV services were launched in the digital format. ATSC can carry multiple channels of information on a single stream, and it is common for there to be a single high-definition signal and several standard-definition signals carried on a single (former) NTSC channel allocation.

Background

The high-definition television standards defined by the ATSC produce wide screen 16:9 images up to 1920×1080 pixels in size – more than six times the display resolution of the earlier standard. However, many different image sizes are also supported. The reduced bandwidth requirements of lower-resolution images allow up to six standard-definition "subchannels" to be broadcast on a single 6 MHz TV channel.

ATSC standards are marked A/x (x is the standard number) and can be downloaded for free from the ATSC's website at ATSC.org. ATSC Standard A/53, which implemented the system developed by the Grand Alliance, was published in 1995; the standard was adopted by the Federal Communications Commission in the United States in 1996. It was revised in 2009. ATSC Standard A/72 was approved in 2008 and introduces H.264/AVC video coding to the ATSC system.

ATSC supports 5.1-channel surround sound using the Dolby Digital's AC-3 format. Numerous auxiliary datacasting services can also be provided.

Many aspects of ATSC are patented, including elements of the MPEG video coding, the AC-3 audio coding, and the 8VSB modulation.[1] The cost of patent licensing, estimated at up to $50 per digital TV receiver,[2] has prompted complaints by manufacturers.[3]

As with other systems, ATSC depends on numerous interwoven standards, e.g. the EIA-708 standard for digital closed captioning, leading to variations in implementation.

Digital switchover

ATSC replaced much of the analog NTSC television system[4] in the United States[5][6] on June 12, 2009, replaced NTSC on August 31, 2011 in Canada and on December 31, 2012 in South Korea, and[7] has replaced NTSC as of September 2015 in the Dominican Republic, December 31, 2015 in Mexico.[8]

Broadcasters who used ATSC and wanted to retain an analog signal were temporarily forced to broadcast on two separate channels, as the ATSC system requires the use of an entire separate channel. Channel numbers in ATSC do not correspond to RF frequency ranges, as they did with analog television. Instead, virtual channels, sent as part of the metadata along with the program(s), allow channel numbers to be remapped from their physical RF channel to any other number 1 to 99, so that ATSC stations can either be associated with the related NTSC channel numbers, or all stations on a network can use the same number. There is also a standard for distributed transmission systems (DTx), a form of single-frequency network which allows for the synchronised operation of multiple on-channel booster stations.

Audio

Dolby Digital AC-3 is used as the audio codec, though it was standardized as A/52 by the ATSC. It allows the transport of up to five channels of sound with a sixth channel for low-frequency effects (the so-called "5.1" configuration). In contrast, Japanese ISDB HDTV broadcasts use MPEG's Advanced Audio Coding (AAC) as the audio codec, which also allows 5.1 audio output. DVB (see below) allows both.

MPEG-2 audio was a contender for the ATSC standard during the DTV "Grand Alliance" shootout, but lost out to Dolby AC-3. The Grand Alliance issued a statement finding the MPEG-2 system to be "essentially equivalent" to Dolby, but only after the Dolby selection had been made. Later, a story emerged that MIT had entered into an agreement with Dolby whereupon the university would be awarded a large sum of money if the MPEG-2 system was rejected. Dolby also offered an incentive for Zenith to switch their vote (which they did); however, it is unknown whether they accepted the offer.[9]

Video

The ATSC system supports a number of different display resolutions, aspect ratios, and frame rates. The formats are listed here by resolution, form of scanning (progressive or interlaced), and number of frames (or fields) per second (see also the TV resolution overview at the end of this article).

For transport, ATSC uses the MPEG systems specification, known as an MPEG transport stream, to encapsulate data, subject to certain constraints. ATSC uses 188-byte MPEG transport stream packets to carry data. Before decoding of audio and video takes place, the receiver must demodulate and apply error correction to the signal. Then, the transport stream may be demultiplexed into its constituent streams.

MPEG-2

There are three basic display sizes for ATSC. Basic and enhanced NTSC and PAL image sizes are at the bottom level at 480 or 576 lines. Medium-sized HDTV images have 720 scanlines and are 1280 pixels wide. The top tier has 1080 lines 1920 pixels wide. 1080-line video is actually encoded with 1920×1088 pixel frames, but the last eight lines are discarded prior to display. This is due to a restriction of the MPEG-2 video format, which requires the number of coded luma samples (i.e. pixels) to be divisible by 16.

Most resolutions can operate in progressive scan or interlaced mode, although the highest 1080-line system cannot display progressive images at the rate of 50, 59.94 or 60 frames per second, because such technology was seen as too advanced at the time and the image quality was deemed to be too poor considering the amount of data that needs to be transmitted. The standard also demands 720-line video be progressive-scan.

A terrestrial (over-the-air) transmission carries 19.39 megabits of data per second (a fluctuating bandwidth of about 18.3 Mbit/s left after overhead such as error correction, program guide, closed captioning, etc.), compared to a maximum possible MPEG-2 bitrate of 10.08 Mbit/s (7 Mbit/s typical) allowed in the DVD standard and 48 Mbit/s (36 Mbit/s typical) allowed in the Blu-ray disc standard.

Although the ATSC A/53 standard limits MPEG-2 transmission to the formats listed below (with integer frame rates paired with 1000/1001-rate versions), the U.S. Federal Communications Commission declined to mandate that television stations obey this part of the ATSC's standard. In theory, television stations in the U.S. are free to choose any resolution, aspect ratio, and frame/field rate, within the limits of Main Profile @ High Level. Many stations do go outside the bounds of the ATSC specification by using other resolutions – for example, 352 x 480 or 720 x 480.

"EDTV" displays can reproduce progressive scan content and frequently have a 16:9 wide screen format. Such resolutions are 704×480 or 720×480 in NTSC and 720×576 in PAL, allowing 60 progressive frames per second in NTSC or 50 in PAL.

ATSC Standard A/53 Part 4:2009 (MPEG-2 Video System Characteristics)
Resolution Aspect ratio Pixel aspect ratio Scanning Frame rate (Hz)
Vertical Horizontal
1080 1920 16:9 1:1 progressive 23.976
24
29.97
30
interlaced 29.97 (59.94 fields/s)
30 (60 fields/s)
720 1280 16:9 1:1 progressive 23.976
24
29.97
30
59.94
60
480 704 4:3 or 16:9 SMPTE 259M progressive 23.976
24
29.97
30
59.94
60
interlaced 29.97 (59.94 fields/s)
30 (60 fields/s)
640 4:3 1:1 progressive 23.976
24
29.97
30
59.94
60
interlaced 29.97 (59.94 fields/s)
30 (60 fields/s)

ATSC also supports PAL frame rates and resolutions which are defined in ATSC A/63 standard.

ATSC Standard A/63:1997 (Standard for Coding 25/50 Hz Video)
Resolution Aspect ratio Pixel aspect ratio Scanning Frame rate (Hz)
Vertical Horizontal
1080 1920 16:9 1:1 interlaced 25 (50 fields/s)
progressive 25
720 1280 16:9 1:1 progressive 50
576 720 4:3 or 16:9 SMPTE 259M progressive 25
50
interlaced 25 (50 fields/s)
544 4:3 or 16:9 SMPTE 259M
three quarters		 progressive 25
interlaced 25 (50 fields/s)
480 4:3 or 16:9 SMPTE 259M
two thirds		 progressive 25
interlaced 25 (50 fields/s)
352 4:3 or 16:9 SMPTE 259M
half		 progressive 25
interlaced 25 (50 fields/s)
288 352 4:3 or 16:9 CIF progressive 25

The ATSC A/53 specification imposes certain constraints on MPEG-2 video stream:

The ATSC specification and MPEG-2 allow the use of progressive frames coded within an interlaced video sequence. For example, NBC stations transmit a 1080i60 video sequence, meaning the formal output of the MPEG-2 decoding process is sixty 540-line fields per second. However, for prime-time television shows, those 60 fields can be coded using 24 progressive frames as a base – actually, an 1080p24 video stream (a sequence of 24 progressive frames per second) is transmitted, and MPEG-2 metadata instructs the decoder to interlace these fields and perform 3:2 pulldown before display, as in soft telecine.

The ATSC specification also allows 1080p30 and 1080p24 MPEG-2 sequences, however they are not used in practice, because broadcasters want to be able to switch between 60 Hz interlaced (news), 30 Hz progressive or PsF (soap operas), and 24 Hz progressive (prime-time) content without ending the 1080i60 MPEG-2 sequence.

The 1080-line formats are encoded with 1920 × 1088 pixel luma matrices and 960 × 540 chroma matrices, but the last 8 lines are discarded by the MPEG-2 decoding and display process.

H.264/MPEG-4 AVC

In July 2008, ATSC was updated to support the ITU-T H.264 video codec. The new standard is split in two parts:

The new standards supports 1080p at 50, 59.94 and 60 frames per second; such frame rates require H.264/AVC High Profile Level 4.2, while standard HDTV frame rates only require Levels 3.2 and 4, and SDTV frame rates require Levels 3 and 3.1.

ATSC Standard A/72 Part 1:2008 (Video System Characteristics of AVC)
Resolution Aspect ratio Pixel aspect ratio Scanning Frame rate (Hz) Level
Vertical Horizontal
1080 1920 16:9 1:1 progressive 23.976
24
29.97
30
25		 4
progressive 59.94
60
50		 4.2
interlaced 29.97 (59.94 fields/s)
30 (60 fields/s)
25 (50 fields/s)		 4
1440 16:9 HDV
(4:3)		 progressive 23.976
24
29.97
30
25		 4
progressive 59.94
60
50		 4.2
interlaced 29.97 (59.94 fields/s)
30 (60 fields/s)
25 (50 fields/s)		 4
720 1280 16:9 1:1 progressive 23.976
24
29.97
30
59.94
60
25
50		 3.2, 4
480 720 4:3 or 16:9 SMPTE 259M
(10:11 or 40:33)		 progressive 23.976
24
29.97
30
59.94
60
25
50		 3.1, 4
interlaced 29.97 (59.94 fields/s)
30 (60 fields/s)
25 (50 fields/s)		 3
704 4:3 or 16:9 SMPTE 259M
(10:11 or 40:33)		 progressive 23.976
24
29.97
30
59.94
60
25
50		 3.1, 4
interlaced 29.97 (59.94 fields/s)
30 (60 fields/s)
25 (50 fields/s)		 3
640 4:3 1:1 progressive 23.976
24
29.97
30
59.94
60
25
50		 3.1, 4
interlaced 29.97 (59.94 fields/s)
30 (60 fields/s)
25 (50 fields/s)		 3
544 4:3 SMPTE 259M
three quarters
(40:33)		 progressive 23.976
25		 3
interlaced 29.97 (59.94 fields/s)
25 (50 fields/s)
528 4:3 SMPTE 259M
three quarters
(40:33)		 progressive 23.976
25		 3
interlaced 29.97 (59.94 fields/s)
25 (50 fields/s)
352 4:3 SMPTE 259M
half
(20:11)		 progressive 23.976
25		 3
interlaced 29.97 (59.94 fields/s)
25 (50 fields/s)
240 352 4:3 SIF
(10:11)		 progressive 23.976
25		 3
120 176 4:3 SIF half
(10:11)		 progressive 23.976
25		 1.1

Transport stream (TS)

Main article: MPEG transport stream

The file extension ".TS" stands for "transport stream", which is a media container format. It may contain a number of streams of audio or video content multiplexed within the transport stream. Transport streams are designed with synchronization and recovery in mind for potentially lossy distribution (such as over-the-air ATSC broadcast) in order to continue a media stream with minimal interruption in the face of data loss in transmission. When an over-the-air ATSC signal is captured to a file via hardware/software the resulting file is often in a .TS file format.

Modulation and transmission

Main articles: 8VSB and QAM tuner

ATSC signals are designed to use the same 6 MHz bandwidth as analog NTSC television channels (the interference requirements of A/53 DTV standards with adjacent NTSC or other DTV channels are very strict). Once the digital video and audio signals have been compressed and multiplexed, the transport stream can be modulated in different ways depending on the method of transmission.

The proposals for modulation schemes for digital television were developed when cable operators carried standard-resolution video as uncompressed analog signals. In recent years, cable operators have become accustomed to compressing standard-resolution video for digital cable systems, making it harder to find duplicate 6 MHz channels for local broadcasters on uncompressed "basic" cable.

Currently, the Federal Communications Commission requires cable operators in the United States to carry the analog or digital transmission of a terrestrial broadcaster (but not both), when so requested by the broadcaster (the "must-carry rule"). The Canadian Radio-television and Telecommunications Commission in Canada does not have similar rules in force with respect to carrying ATSC signals.

However, cable operators have still been slow to add ATSC channels to their lineups for legal, regulatory, and plant & equipment related reasons. One key technical and regulatory issue is the modulation scheme used on the cable: cable operators in the U.S. (and to a lesser extent Canada) can determine their own method of modulation for their plants. Multiple standards bodies exist in the industry: the SCTE defined 256-QAM as a modulation scheme for cable in a cable industry standard, ANSI/SCTE 07 2006: Digital Transmission Standard For Cable Television. Consequently, most U.S. and Canadian cable operators seeking additional capacity on the cable system have moved to 256-QAM from the 64-QAM modulation used in their plant, in preference to the 16VSB standard originally proposed by ATSC. Over time 256-QAM is expected to be included in the ATSC standard.

There is also a standard for transmitting ATSC via satellite; however, this is only used by TV networks. Very few teleports outside the U.S. support the ATSC satellite transmission standard, but teleport support for the standard is improving. The ATSC satellite transmission system is not used for direct-broadcast satellite systems; in the U.S. and Canada these have long used either DVB-S (in standard or modified form) or a proprietary system such as DSS or DigiCipher 2.

Other systems

ATSC coexists with the DVB-T standard, and with ISDB-T. A similar standard called ADTB-T was developed for use as part of China's new DMB-T/H dual standard. While China has officially chosen a dual standard, there is no requirement that a receiver work with both standards and there is no support for the ADTB modulation from broadcasters or equipment and receiver manufacturers.

For compatibility with material from various regions and sources, ATSC supports the 480i video format used in the NTSC analog system (480 lines, approximately 60 fields or 30 frames per second), 576i formats used in most PAL regions (576 lines, 50 fields or 25 frames per second), and 24 frames-per-second formats used in film.

While the ATSC system has been criticized as being complicated and expensive to implement and use,[12] both broadcasting and receiving equipment are now comparable in cost with that of DVB.

The ATSC signal is more susceptible to changes in radio propagation conditions than DVB-T and ISDB-T. It also lacks true hierarchical modulation, which would allow the SDTV part of an HDTV signal (or the audio portion of a television program) to be received uninterrupted even in fringe areas where signal strength is low. For this reason, an additional modulation mode, enhanced-VSB (E-VSB) has been introduced, allowing for a similar benefit.

In spite of ATSC's fixed transmission mode, it is still a robust signal under various conditions. 8VSB was chosen over COFDM in part because many areas are rural and have a much lower population density, thereby requiring larger transmitters and resulting in large fringe areas. In these areas, 8VSB was shown to perform better than other systems.

COFDM is used in both DVB-T and ISDB-T, and for 1seg, as well as DVB-H and HD Radio in the United States. In metropolitan areas, where population density is highest, COFDM is said to be better at handling multipath propagation. While ATSC is also incapable of true single-frequency network (SFN) operation, the distributed transmission mode, using multiple synchronized on-channel transmitters, has been shown to improve reception under similar conditions. Thus, it may not require more spectrum allocation than DVB-T using SFNs. A comparison study found that ISDB-T and DVB-T performed similarly, and that both were outperformed by DVB-T2.[13]

Mobile TV

Main article: ATSC-M/H

Mobile reception of digital stations using ATSC has, until 2008, been difficult to impossible, especially when moving at vehicular speeds. To overcome this, there are several proposed systems that report improved mobile reception: Samsung/Rhode & Schwarz's A-VSB, Harris/LG's MPH, and a recent proposal from Thomson/Micronas; all of these systems have been submitted as candidates for a new ATSC standard, ATSC-M/H. After one year of standardization, the solution merged between Samsung's AVSB and LGE's MPH technology has been adopted and would have been deployed in 2009. This is in addition to other standards like the now-defunct MediaFLO, and worldwide open standards such as DVB-H and T-DMB. Like DVB-H and ISDB 1seg, the proposed ATSC mobile standards are backward-compatible with existing tuners, despite being added to the standard well after the original standard was in wide use.

Mobile reception of some stations will still be more difficult, because 18 UHF channels in the U.S. have been removed from TV service, forcing some broadcasters to stay on VHF. This band requires larger antennas for reception, and is more prone to electromagnetic interference from engines and rapidly changing multipath conditions.

Future

ATSC 2.0

ATSC 2.0 is a major new revision of the standard which will be backward compatible with ATSC 1.0. The standard will allow interactive and hybrid television technologies by connecting the TV with the Internet services and allowing interactive elements into the broadcast stream. Other features include advanced video compression, audience measurement, targeted advertising, enhanced programming guides, video on demand services, and the ability to store information on new receivers, including Non-realtime (NRT) content.[14][15][16]

ATSC 3.0

Main article: ATSC 3.0

ATSC 3.0 will provide even more services to the viewer and increased bandwidth efficiency and compression performance, which requires breaking backwards compatibility with the current version. ATSC 3.0 is expected to emerge within the next decade.[14]

LG Electronics tested the standard with 4K on February 23, 2016. With the test considered a success, South Korea announced that ATSC 3.0 broadcasts would start in February 2017.[17]

On March 28, 2016, the Bootstrap component of ATSC 3.0 (System Discovery and Signalling) was upgraded from candidate standard to finalized standard.[18]

On June 29, 2016, NBC affiliate WRAL-TV in Raleigh, North Carolina, a station known for its pioneering roles in testing the original DTV standards, launched an experimental ATSC 3.0 channel carrying the station's programming in 1080p, as well as a 4K demo loop.[19]

ATSC 3.0's multiple layers. The standards within ATSC 3.0 are rolled into each of the layers.
Structure/ATSC 3.0 System Layers[20]
  1. Bootstrap: System Discovery and Signalling
  2. Physical Layer: Transmission (OFDM)
  3. Protocols: IP, MMT
  4. Presentation: Audio and Video standards (to be determined), Ultra HD with High Definition and standard definition multicast, Immersive Audio
  5. Applications: Screen is a web page

Countries and territories using ATSC

North America

South America

Asia/Pacific

See also

References

  1. ↑ TV makers to fight royalties
  2. ↑ FCC Opens Inquiry Into Patent Costs For Digital TVs, Dow Jones, February 25, 2009
  3. ↑ Amtran affiliate accuses Funai of unfair competition, Lisa Wang, Taipei Times, February 24, 2009
  4. ↑ "Best Buy Exits the Analog TV Business, Outlines Plans to Help With Digital Broadcast Transition"
  5. ↑ A New Era in Television Broadcasting – DTVTransition.org
  6. ↑ Congress delays DTV switch
  7. ↑ The Commission establishes a new approach for Canadian conventional television
  8. 1 2 DECRETO por el que se establecen las acciones que deberán llevarse a cabo por la Administración Pública Federal para concretar la transición a la Televisión Digital Terrestre. Diario Oficial de la Federacion: 02/09/2010
  9. ↑ Keith J. Winsteln (November 8, 2002), "MIT Getting Millions For Digital TV Deal" (PDF), The Tech, Massachusetts Institute of Technology
  10. ↑ "Archived copy" (PDF). Archived from the original (PDF) on April 7, 2014. Retrieved 2014-04-03.
  11. ↑ "Archived copy" (PDF). Archived from the original (PDF) on April 7, 2014. Retrieved 2014-04-03.
  12. ↑ ATSC vs DVB for North American amateurs
  13. ↑ Julian Clover DVB-T far superior to ISDB, DVB-T2 beats them both, in broadbandtvnews November 2, 2010
  14. 1 2 2013_electronic.indd Archived May 9, 2013, at the Wayback Machine.. (PDF) . Retrieved on May 11, 2014.
  15. ↑ George Winslow. "With ATSC 2.0, Broadcasting Gets Facelift". Broadcasting & Cable, June 6, 2011.
  16. ↑ A/103:2012, Non-Real-Time Content Delivery
  17. ↑ Tribbey, Chris (March 7, 2016). "ATSC 3.0 Passes Key Test, But Is It Ready to Graduate?". Broadcasting & Cable: 16–17.
  18. ↑ http://www.tvtechnology.com/news/0002/first-element-of-atsc-30-approved-for-standard/278263
  19. ↑ "WRAL Launches ATSC 3.0 Service". TVNewsCheck. Retrieved 29 June 2016.
  20. ↑ http://www.tvtechnology.com/portals/0/ATSC30Layers.png
  21. ↑ Bahamas national TV to get multi-million dollar digital upgrade – video. The Bahamas Investor. Retrieved on May 11, 2014.
  22. ↑ "CRTC allows CBC to continue broadcasting analog television signals in 22 markets until August 2012". News Releases. Canadian Radio-television and Telecommunications Commission. August 16, 2011. Retrieved June 4, 2013.
  23. ↑ Advanced Television Systems Committee, Dominican Republic Adopts ATSC Digital Television Standard Archived August 23, 2010, at the Wayback Machine., August 12, 2010
  24. ↑ ', El Salvador aun no define estandar de television digital, January 28, 2015
  25. ↑ Hester, Lisa (July 6, 2004). "Mexico To Adopt The ATSC DTV Standard". Advanced Television Systems Committee. Retrieved June 4, 2013. On July 2 the Government of Mexico formally adopted the ATSC Digital Television (DTV) Standard for digital terrestrial television broadcasting.
  26. ↑ Dibble, Sandra (May 30, 2013). "New turn for Tijuana's transition to digital broadcasting". San Diego Union-Tribune. Retrieved June 4, 2013.
  27. 1 2 "Low Power Television (LPTV) Service", CDBS Database, Federal Communications Commission, retrieved April 3, 2013
  28. 1 2 "FAQ digitale telivisie (DTC)". Telecommunication Authority of Suriname. Retrieved July 9, 2015.
  29. ↑ "TAS streeft naar digitale tv Suriname per juni". StarNieuws. March 18, 2015. Retrieved July 9, 2015.
  30. ↑ "'Digitale tv in juni 2015 niet haalbaar'". Suriname Herald. March 19, 2015. Retrieved July 9, 2015.
  31. ↑ "N. Korea in the process of introducing digital TV broadcasting". Yonhap News Agency. March 19, 2013. Retrieved June 4, 2013.
  32. ↑ "North Korean television sets still receive South Korean signals". News Focus International. Retrieved July 12, 2015.

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