712:) numbers are common. So, Channel 4 digital signals may now actually be broadcast on channel 43, or any other frequency. When the ATSC tuner does a channel scan, it finds the signal on channel 43, learns that this material is called "Channel 4", and remembers that mapping. The user can tune to "4", and the tuner will know to tune in 43. Before a scan is done, it may be possible to access the programs directly by manual tuning, by entering 43–1, 43–2... After the scan, the programs would usually be accessed by entering 4–1, 4-2 etc., but it may still be possible to also access them directly at 43 as long as it is also not the same as an already assigned channel. If stations change their broadcast frequencies, it may be possible to access the new frequencies directly as long as it is also not the same as an already assigned channel in which case it will go to that channel instead of the frequency, but the usual procedure is to re-scan all of the channels which will just assign multiple version of any overlapping channels.
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number of checks and repair data so that a signal can be viewed on a TV set. Error correction works by adding some extra information to the signal before transmission that can be used upon reception to fill in gaps. Therefore, error correction has the opposite effect of compression—it increases the amount of data to transmit, rather than reducing it like compression does, and it improves the quality and robustness of the signal rather than reducing it. Compression removes redundant (and some non-redundant) data, while error correction adds some redundant data. The reason for using error correction rather than just using less compression and keeping the redundancy that was already there is that error correction systems are specially designed to get the maximum benefit out of a very small amount of redundant data, whereas the natural redundancy of the data doesn't do this job as efficiently, so with error correction the net amount of data needed is still smaller.
674:". This may also leave the old "dead" channel mapping in place, so that there is the new 8.1, dead 8.1, new 8.2, dead 8.2, etc. In most cases, TV stations will not have the actual frequency they are currently using on their website. If the auto scan does not pick up the signal and the tuner has manual frequency scan capability try to get the actual frequency from the station engineer. This may allow one to stay on one frequency (channel) versus "scanning" (moving too quickly through) and allow one to make antenna adjustments while observing only a problematic channel.
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reliably tuned with an outdoor antenna and an ATSC tuner in
Canadian markets within 60 miles of the US broadcast towers. These markets include Toronto (from Buffalo), Windsor (from Detroit and Toledo), Vancouver (from Seattle and Tacoma), Montreal (from Burlington and Plattsburgh), Ottawa (from Watertown and Plattsburgh), and Fredericton (from Presque Isle). Indoor antennas (both passive and amplified) are easier to install, but outdoor antennas are better at tuning stations from further distances.
533:. The coupons expired 90 days after initial mailing and were not renewable. All households were eligible to receive coupons from the initial $ 990 million allocated, after which an additional $ 510 million in coupons was to be available to households that rely exclusively on over-the-air television reception. On January 4, 2009, the coupon program reached its US$ 1.34 billion ceiling and any further consumer requests were placed on a waiting list.
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although many ATSC tuners only have this option. Some have an "easy-add" feature which does not delete what is already mapped in memory. Some allow the user to enter the physical channel and an unmapped subchannel, causing the tuner to search the physical channel. Depending on the tuner, this may or may not automatically add the station and its
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explicitly proscribe, as a condition of license, the broadcast of more than fourteen hours a week of programming not already on the analogue service. Unlike in the United States, there is no plan to subsidise ATSC converter purchases and no requirement that newly imported receivers decode the digital
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Each digital OTA channel number is composed of a main number and a subchannel, for example 4.1, 4.2, etc. A dash is an alternate form of representation: 4–1, 4–2... The dot and dash are interchangeable; they both mean the same thing. The main channel numbers refer to the same radio frequencies as
506:
to cease their analog broadcasts by
February 17, 2009 (this cut-off date had been moved several times previously). On February 11, 2009, the mandatory DTV broadcast date was moved again to June 12, 2009, although stations were allowed to switch earlier. The delay enabled distribution of more coupons
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can also be used for this, but very few if any ATSC tuners include this (which requires downloading all guide data for all channels from one particular station). Stations sending the wrong time are also a major problem, as this can skew or ruin guide data for all stations until the correct time is
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in the U.S. This requires all viewers to re-scan or manually add the new channel and possibly delete the old one. Doing a full re-scan will usually cause other channels to be dropped if they cannot be received at the moment the scan passes their physical channel, so this is typically undesirable,
514:
tuners are unable to receive over-the-air broadcasts from United States TV stations, unless the broadcast is from a repeater or low-power transmitter. However, Class-A stations shut down analog transmissions on
September 1, 2015 followed by a complete shutdown of all low-power and repeater stations
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data. Many ATSC tuners will remember EPG info for each station, but only for a few hours after viewing a channel on that station. Some will not remember at all (displaying only the required channel banner), while a very few others will store data for days (although this requires staying tuned to
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Several TV stations are using or have used a temporary channel to send their DTV signals and, upon terminating analog transmission, move their digital transmission either back to their old analog channel, or to a third channel (sometimes the former analog of another local station), chosen in the
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is a technology that is used by the ATSC tuner to make sure that any data that is missing can be corrected. For instance, sometimes interference or a poor-quality signal will cause the loss of some data that the ATSC tuner receives. With error correction, the tuner has the ability to perform a
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As of the beginning of 2012, almost all
Canadian broadcasters are broadcasting an ATSC signal, with a handful of exceptions granted for low-power and regional stations. These signals can be reliably tuned in most cities with a good indoor antenna and an ATSC tuner. US-based ATSC signals can be
374:, so while the decompressed data size is the same as the original compressed data size, the data produced is not exactly the same as the original data fed into the system at the transmitting site, but it is close enough that most people will not notice a difference.
290:. ATSC tuners provide the following functions: selective tuning; demodulation; transport stream demultiplexing; decompression; error correction; analog-to-digital conversion; AV synchronization; and media reformatting to fit the specific type of TV screen optimally.
522:". Viewers who did not upgrade, either to a television with a digital tuner or a set-top box, ended up losing their only source of television, unless they relied only upon the aforementioned non-full-power broadcasters. A Congressional bill authorized subsidized
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is the coordination of audio and video signals being displayed on a digital TV in proper time. AV synchronization ensures that the audio does not lag behind the video that is being displayed on the TV set or vice versa, so that both audio and video are in sync.
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Devices manufactured before these dates can still be sold without a built-in ATSC DTV tuner; the lack of digital tuners legally must be disclosed to consumers and most name-brand retailers have incurred FCC penalties for non-compliance with these requirements.
555:(CRTC) had set August 31, 2011, as the date on which over-the-air analog TV transmission service would cease in 31 major markets of the country, including all provincial capitals, plus Ottawa (the national capital), and most other major urban centers.
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Reception is greatly reduced due to EMI in the shortwave to VHF and UHF bandwidth from nearby computers of all sorts , portable WiFi and
Broadband internet , microwave ovens , cell phones and the towers they communicate with, and even power lines with
322:"Demodulation" means transforming the signal from the tuner into a signal that a TV set can use to produce images and sound without further consideration for the frequency at which it was transmitted. It is separation of a standard
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in a way that allowed viewers to receive the new digital broadcasts on their old TVs. The transition proceeded with about 235,000 people requesting coupons after the June 12, 2009, transition date.
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For the transmission of HDTV at 720 or 1080, an extra 1% to 3% added error correction codes will help reduce some of ATSC's poorer performance with weak signals under adverse multipath conditions.
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Media reformatting is extremely important because the formatting of images on TV sets differs significantly according to the technology employed. For instance, some televisions have an
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Since digital signals that are broadcast over the air are compressed (packed smaller), once they are received by the ATSC tuner, these compressed packets of digital data are then
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By March 1, 2007 all televisions regardless of screen size, and all interface devices that include a tuner (VCR, DVD player/recorder, DVR) must include a built-in ATSC DTV tuner.
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offering limited selection at higher prices than in the US with no government subsidies. ATSC tuners may also be present in most recently manufactured televisions, as well as
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signal. Canadian retailers are also not required to disclose the inability of new equipment to receive DTV. The
Canadian market therefore has been flooded with obsolete new
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Multiple MPEG programs are combined then sent to a transmitting antenna. In the US broadcast digital TV system, an ATSC receiver then decodes the TS and displays it on a TV.
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Two $ 40 coupons were made available per US address nominally from
January 1, 2008, through March 31, 2009; each coupon could be used toward the purchase of one approved
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signal from the RF carrier that was used to transmit it through the air (or down a coaxial cable or other long-distance medium.) ATSC as implemented in the US uses
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259:. Zooming is an example of resolution change. It is commonly used to convert a low-resolution picture to a high-resolution display. This lets the user eliminate
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The terms "tuner" and "receiver" are used loosely, and it is perhaps more appropriately called an ATSC receiver, with the tuner being part of the receiver (see
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In the US, multiple digital signals are combined and then transmitted from one antenna source to create over the air broadcasts. By the reverse process (
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The ATSC standard (ATSC-E) has a subsection that allows broadcasters to add extra (and variable types) of error correction to their broadcast streams.
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1027:"Commerce's NTIA Welcomes Congressional Action on DTV Delay as Opportunity for More Americans to Prepare for the End of the Digital TV Transition"
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Other errors which appear to be in the tuner are actually the result of incorrect data sent by one or more stations, often including missing
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RF signals. The tuner usually performs the function of frequency-agile selection, along with rejection of unwanted out-of-band signals.
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by July 13, 2021. Canada had a similar analog TV termination date set to
September 1, 2011 (except in some remote northern regions).
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equipment which lawfully cannot be exported to the US. A limited number of ATSC receivers are in
Canadian retail stores as
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By March 1, 2006 all televisions with screen sizes over 25 inches (64 cm) must include a built-in ATSC DTV tuner.
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By July 1, 2005 all televisions with screen sizes over 36 inches (91 cm) must include a built-in ATSC DTV tuner.
216:). The receiver generates the audio and video (AV) signals needed for television, and performs the following tasks:
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It was feared that the US switch-off would cause millions of non-cable- and non-satellite-connected TV sets to "go
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to the channel map. If no PSIP is transmitted, the physical channel number is used, and each transport stream is
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239:; and media reformatting to match what is optimal input for one's TV. Examples of media reformatting include:
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Section 3002 of the Act amends 47 U.S.C. section 309(j)(14) to provide for the
February 17, 2009, deadline.
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867:"CFR Title 47: Telecommunication; PART 15—RADIO FREQUENCY DEVICES; § 15.117 TV broadcast receivers"
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998:"Commerce Department Issues Final Rule To Launch Digital-to-Analog Converter Box Coupon Program"
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Most ATSC tuners have relatively simple on-screen menus, and automatically bring the user to a
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An ATSC tuner works by generating audio and video signals that are picked up from over-the-air
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This error correction service is not mandatory in the US, nor is it mandatory in Canada.
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1131:"Understanding broadband silicon tuners for broadband cable and TV apps: A Tutorial"
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converter boxes were first carried nationally in October 2008, with chains such as
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modulation, which requires less power to transmit, as opposed to the also proposed
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each station for more than a few seconds in order to receive the extended info).
657:), or starting sequentially at .1, .2, .3, and so forth, depending on the tuner.
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FCC, April 10, 2008: FCC adopts DTV enforcement orders totaling over $ 6 million
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It is not known how many HDTV receivers support this error correction standard.
274:, will stretch automatically, either by detecting black bars or by reading the
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Another type of television tuner is a digital television adapter (DTA) with an
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by stretching or cropping the picture. Some ATSC receivers, mostly those in
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screen when turned on for the first time. This allows the user to pick the
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receivers with ATSC tuners can download the guide at any time, while other
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and then decodes it to display one of its component signals on a TV set.
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979:(Press release). Federal Communications Commission. June 15, 2009
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has issued the following mandates for devices entering the US:
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which provides audio/video output connectors of various types.
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Enabling TV Tuner Technology for All-Digital Cable Networks
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Canadian Radio-television and Telecommunications Commission
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received again from a different and correctly set station.
553:
Canadian Radio-television and Telecommunications Commission
800:"Requirements for Digital Television Receiving Capability"
510:
As of June 12, 2009, TVs and other equipment with legacy
370:(unpacked to their original size). The ATSC system uses
342:
and therefore better received in mobile installations).
1150:"Tentative Digital Television (DTV) Channel assignment"
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641:. If it is able to decode the station, it reads its
633:), and bandscan for stations. The scan "listens" on
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Pub. L. No. 109-171, 120 Stat. 4 (February 8, 2006).
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1133:. Digital TV Designline. 2006-05-17. Archived from
49:. Unsourced material may be challenged and removed.
490:Digital television transition in the United States
476:The current regulations are specified in the U.S.
450:Digital television transition in the United States
436:picture. Different televisions have a different
354:), an ATSC receiver first receives the combined
1112:"Over the air digital television reception FAQ"
950:"Congress Delays Troubled Switch To Digital TV"
742:High-definition television in the United States
1080:"Broadcasting Regulatory Policy CRTC 2010-167"
974:"FCC CONTINUES DTV OUTREACH ACROSS THE NATION"
1222:
831:"FCC Moves Up DTV Tuner Date, Broadens Scope"
776:"FCC INTRODUCES PHASE-IN PLAN FOR DTV TUNERS"
562:on-air and all existing digital transitional
298:Selective tuning is the process by which the
8:
181:. Such tuners are usually integrated into a
900:"Senate approves 2009 for end of analog TV"
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109:Learn how and when to remove this message
306:is selected by a receiver from within a
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690:units download guide data separately.
637:, and pauses when it detects a digital
629:mode (as all stations transmit time in
499:became law, which calls for full-power
488:For Low-Power Television Stations, see
1682:Downloadable Conditional Access System
1541:Template:American broadcast television
1064:: CS1 maint: archived copy as title (
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653:according to its TSID (converted from
1546:Template:Canadian television networks
558:As of the end of 2008, there were 22
135:Advanced Television Systems Committee
16:Tuner for digital television channels
7:
1535:Digital multicast television network
247:or vice versa; picture resolutions;
47:adding citations to reliable sources
926:Hachman, Mark (February 11, 2009).
833:. TWICE. 2005-11-21. Archived from
251:conversions (16:9 to or from 4:3);
1637:Interactive-digital-cable-ready TV
1008:from the original on 14 March 2007
670:to the map, and/or to the user's "
14:
1354:U.S. Converter Box Coupon Program
805:. FCC. 2005-11-08. Archived from
507:for purchase of converter boxes.
444:United States government mandates
1306:Metropolitan Television Alliance
962:from the original on 2017-03-18.
928:"Obama Makes DTV Delay Official"
23:
1279:Distributed transmission system
1118:from the original on 2006-05-22
1090:from the original on 2010-03-26
432:picture, whereas others have a
34:needs additional citations for
1642:OpenCable Application Platform
1184:The FCC's DTV information site
737:Digital terrestrial television
484:Analog TV broadcast switch-off
1:
531:coupon-eligible converter box
497:Deficit Reduction Act of 2005
334:modulation (used in European
1164:"Television Frequency Table"
1114:. AVS forum. 29 March 2002.
543:Digital television in Canada
537:Canadian government mandates
704:previously. However, now "
478:Code of Federal Regulations
1946:
1915:High-definition television
1349:Digital television adapter
635:every channel from 2 to 69
573:high-definition television
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1859:Channel protection ratios
1849:Active Format Description
1770:Digital Satellite Service
1592:wireless spectrum auction
560:Canadian DTV transmitters
338:, which is less prone to
276:Active Format Description
153:that allows reception of
1507:Serial digital interface
1495:Ultra high-definition TV
1339:Digital channel election
1329:All-Channel Receiver Act
708:" (technically known as
679:electronic program guide
663:digital channel election
405:electronic transmissions
1869:Hierarchical modulation
1376:Digital video recorders
1196:Patent and royalty info
575:(HDTV) receivers. ATSC
1930:Television terminology
1625:Digital-cable-ready TV
1456:Enhanced-definition TV
1439:Standard-definition TV
710:logical channel number
191:digital video recorder
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1920:Television technology
495:In early 2006 the US
356:MPEG transport stream
226:MPEG transport stream
124:
1879:Standards conversion
1256:Digital broadcasting
727:Digital broadcasting
627:daylight-saving time
340:multipath distortion
288:broadcast television
165:, as transmitted by
43:improve this article
1555:National deployment
1269:Digital subchannels
955:The Washington Post
668:digital subchannels
645:data, and adds its
613:Setup and operation
564:television licenses
504:television stations
167:television stations
159:television channels
1910:Digital television
1736:Telus Satellite TV
1719:GlobeCast World TV
1473:High-definition TV
1366:Analog passthrough
1321:Digital switchover
1238:Digital television
1189:2011-07-25 at the
732:Digital switchover
722:ATSC DVD recorders
692:TV Guide On Screen
424:Image reformatting
417:AV synchronization
412:AV synchronization
304:television channel
237:AV synchronization
208:Technical overview
202:analog passthrough
155:digital television
141:, often called an
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1763:Claro Puerto Rico
1732:Bell Satellite TV
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1385:Digital standards
1294:National Datacast
1082:(Press release).
872:. FCC. 2006-10-01
781:. FCC. 2002-08-08
600:personal computer
372:lossy compression
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752:Tuner (radio)
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735:
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728:
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362:Decompression
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233:decompression
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99:November 2019
91:
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74:
70:
67:
63:
60: –
59:
55:
54:Find sources:
48:
44:
38:
37:
32:This article
30:
26:
21:
20:
1818:Bell Fibe TV
1748:DigiCipher 2
1714:Dish Network
1701:Satellite TV
1263:
1167:. Retrieved
1153:. Retrieved
1139:. Retrieved
1135:the original
1120:. Retrieved
1105:Bibliography
1092:. Retrieved
1074:
1049:. Retrieved
1045:the original
1035:
1021:
1010:. Retrieved
992:
981:. Retrieved
968:
953:
944:
934:February 12,
932:. Retrieved
921:
908:. Retrieved
906:. 2005-11-04
903:
894:
885:
874:. Retrieved
861:
850:
839:. Retrieved
835:the original
825:
814:. Retrieved
807:the original
794:
783:. Retrieved
770:
709:
702:
676:
659:
639:carrier wave
616:
607:
557:
546:
528:
517:
509:
501:over-the-air
494:
475:
471:
453:
438:aspect ratio
427:
415:
381:
368:decompressed
365:
349:
321:
318:Demodulation
302:(RF) of the
297:
285:
265:pillarboxing
261:letterboxing
249:aspect ratio
218:demodulation
211:
199:
146:
142:
138:
134:
130:
128:
105:
96:
86:
79:
72:
65:
58:"ATSC tuner"
53:
41:Please help
36:verification
33:
1925:Set-top box
1758:Shaw Direct
1741:Dish México
1724:Free-to-air
1359:legislation
1299:UpdateLogic
1284:Datacasting
1264:ATSC tuners
1247:Terrestrial
655:hexadecimal
312:transmitted
195:set-top box
179:South Korea
173:, parts of
1899:Categories
1813:U-verse TV
1793:Sky Mexico
1788:Sky Brazil
1654:Must-carry
1649:Encryption
1630:QAM tuners
1587:transition
1289:Guide Plus
1198:2006-12-27
1169:2009-06-16
1155:2009-06-16
1141:2006-06-05
1122:2006-06-05
1094:2010-03-22
1051:2018-06-03
1012:2007-03-12
983:2013-08-07
876:2015-11-23
841:2006-08-30
816:2006-06-05
785:2006-06-05
763:References
651:enumerated
430:interlaced
253:frame rate
193:(DVR), or
147:HDTV tuner
69:newspapers
1864:HDTV blur
1677:CableCARD
1432:full list
1334:SAFER Act
747:QAM tuner
672:favorites
623:time zone
282:Operation
241:interlace
161:that use
1727:receiver
1402:ATSC-M/H
1187:Archived
1116:Archived
1088:Archived
1060:cite web
1006:Archived
960:Archived
904:NBC News
716:See also
581:Best Buy
324:baseband
214:Metonymy
1823:FibreOP
1779:DirecTV
1687:Tru2way
1517:CEA-909
930:. PCMAG
910:June 5,
684:DirecTV
480:(CFR).
278:(AFD).
272:TV sets
83:scholar
1774:DVB-S2
1672:AllVid
1572:Mexico
1567:Canada
598:, and
551:, the
549:Canada
177:, and
157:(DTV)
85:
78:
71:
64:
56:
1709:DVB-S
1608:Cable
1500:2160p
1488:1080p
1483:1080i
1417:E-VSB
1412:A-VSB
977:(PDF)
870:(PDF)
810:(PDF)
803:(PDF)
779:(PDF)
619:setup
336:DVB-T
332:COFDM
139:tuner
90:JSTOR
76:books
1905:ATSC
1805:IPTV
1784:Vrio
1753:4DTV
1582:HDTV
1539:see
1478:720p
1466:576p
1461:480p
1449:576i
1444:480i
1427:PMCP
1422:PSIP
1407:8VSB
1397:ATSC
1066:link
1002:NTIA
936:2009
912:2006
688:TiVo
643:PSIP
625:and
593:HDTV
583:and
577:CECB
569:NTSC
520:dark
512:NTSC
454:The
328:8VSB
308:band
269:HDTV
131:ATSC
62:news
631:UTC
547:In
456:FCC
310:of
263:or
243:to
187:VCR
169:in
145:or
129:An
45:by
1901::
1062:}}
1058:{{
1000:.
958:.
952:.
902:.
605:.
591:,
440:.
235:;
231:;
224:;
220:;
204:.
189:,
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1734:/
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133:(
112:)
106:(
101:)
97:(
87:·
80:·
73:·
66:·
39:.
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
