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High-definition television (HDTV) is a television system providing an image resolution that is of substantially higher resolution than that of standard-definition television. HDTV is the current standard video format used in most broadcasts: terrestrial broadcast television, cable television, satellite television, Blu-rays, and streaming video. HDTV may be transmitted in various formats:

720p
720p
(HD Ready): 1280×720p: 923,600 pixels (~0.92 MP) per frame 1080i
1080i
(Full HD) : 1920×1080i: 1,036,800 pixels (~1.04 MP) per field or 2,073,600 pixels (~2.07 MP) per frame 1080p
1080p
(Full HD): 1920×1080p: 2,073,600 pixels (~2.07 megapixels) per frame

Some countries also use a non-standard CEA resolution, such as 1440×1080i: 777,600 pixels (~0.78 MP) per field or 1,555,200 pixels (~1.56 MP) per frame

The letter "p" here stands for progressive scan, while "i" indicates interlaced. When transmitted at two megapixels per frame, HDTV provides about five times as many pixels as SD (standard-definition television). The increased resolution provides for a clearer, more detailed picture. In addition, progressive scan and higher frame rates resulting in a picture with less flicker and better rendering of fast motion.[1]

Contents

1 History

1.1 Analog systems 1.2 Demise of analog HD systems 1.3 Rise of digital compression

2 Inaugural HDTV broadcast in the United States 3 European HDTV broadcasts 4 Notation

4.1 Display resolutions 4.2 Standard frame or field rates 4.3 Types of media

5 Modern systems 6 Recording and compression 7 See also 8 References 9 Further reading 10 External links

History[edit] Further information: Analog high-definition television system
Analog high-definition television system
and History of television The term high definition once described a series of television systems originating from August 1936; however, these systems were only high definition when compared to earlier systems that were based on mechanical systems with as few as 30 lines of resolution. The ongoing competition between companies and nations to create true "HDTV" spanned the entire 20th century, as each new system became more HD than the last. In the beginning of the 21st century, this race has continued with 4k, 5k and current 8K systems. The British high-definition TV service started trials in August 1936 and a regular service on 2 November 1936 using both the (mechanical) Baird 240 line sequential scan (later to be inaccurately rechristened 'progressive') and the (electronic) Marconi-EMI 405 line
405 line
interlaced systems. The Baird system was discontinued in February 1937.[2] In 1938 France
France
followed with their own 441-line system, variants of which were also used by a number of other countries. The US NTSC
NTSC
525-line system joined in 1941. In 1949 France
France
introduced an even higher-resolution standard at 819 lines, a system that should have been high definition even by today's standards, but was monochrome only and the technical limitations of the time prevented it from achieving the definition of which it should have been capable. All of these systems used interlacing and a 4:3 aspect ratio except the 240-line system which was progressive (actually described at the time by the technically correct term "sequential") and the 405-line system which started as 5:4 and later changed to 4:3. The 405-line system adopted the (at that time) revolutionary idea of interlaced scanning to overcome the flicker problem of the 240-line with its 25 Hz frame rate. The 240-line system could have doubled its frame rate but this would have meant that the transmitted signal would have doubled in bandwidth, an unacceptable option as the video baseband bandwidth was required to be not more than 3 MHz. Color broadcasts started at similarly higher resolutions, first with the US NTSC
NTSC
color system in 1953, which was compatible with the earlier monochrome systems and therefore had the same 525 lines of resolution. European standards did not follow until the 1960s, when the PAL
PAL
and SECAM
SECAM
color systems were added to the monochrome 625 line broadcasts. The Nippon Hōsō Kyōkai (NHK, the Japan Broadcasting Corporation) began conducting research to "unlock the fundamental mechanism of video and sound interactions with the five human senses" in 1964, after the Tokyo Olympics. NHK
NHK
set out to create an HDTV system that ended up scoring much higher in subjective tests than NTSC's previously dubbed "HDTV". This new system, NHK
NHK
Color, created in 1972, included 1125 lines, a 5:3 aspect ratio and 60 Hz refresh rate. The Society of Motion Picture and Television Engineers (SMPTE), headed by Charles Ginsburg, became the testing and study authority for HDTV technology in the international theater. SMPTE
SMPTE
would test HDTV systems from different companies from every conceivable perspective, but the problem of combining the different formats plagued the technology for many years. There were four major HDTV systems tested by SMPTE
SMPTE
in the late 1970s, and in 1979 an SMPTE
SMPTE
study group released A Study of High Definition Television Systems:

EIA monochrome: 4:3 aspect ratio, 1023 lines, 60 Hz NHK
NHK
color: 5:3 aspect ratio, 1125 lines, 60 Hz NHK
NHK
monochrome: 4:3 aspect ratio, 2125 lines, 50 Hz BBC colour: 8:3 aspect ratio, 1501 lines, 60 Hz[3]

Since the formal adoption of digital video broadcasting's (DVB) widescreen HDTV transmission modes in the mid to late 2000s; the 525-line NTSC
NTSC
(and PAL-M) systems, as well as the European 625-line PAL
PAL
and SECAM
SECAM
systems, are now regarded as standard definition television systems. Analog systems[edit] Main article: analog high-definition television system Early HDTV broadcasting used analog technology, but today it is transmitted digitally and uses video compression. In 1949, France
France
started its transmissions with an 819 lines system (with 737 active lines). The system was monochrome only, and was used only on VHF for the first French TV channel. It was discontinued in 1983. In 1958, the Soviet Union
Soviet Union
developed Тransformator (Russian: Трансформатор, meaning Transformer), the first high-resolution (definition) television system capable of producing an image composed of 1,125 lines of resolution aimed at providing teleconferencing for military command. It was a research project and the system was never deployed by either the military or consumer broadcasting.[4] In 1979, the Japanese public broadcaster NHK
NHK
first developed consumer high-definition television with a 5:3 display aspect ratio.[5] The system, known as Hi-Vision or MUSE after its Multiple sub-Nyquist sampling encoding for encoding the signal, required about twice the bandwidth of the existing NTSC
NTSC
system but provided about four times the resolution (1035i/1125 lines). Satellite test broadcasts started in 1989, with regular testing starting in 1991 and regular broadcasting of BS-9ch commencing on November 25, 1994, which featured commercial and NHK
NHK
programming. In 1981, the MUSE system was demonstrated for the first time in the United States, using the same 5:3 aspect ratio as the Japanese system.[6] Upon visiting a demonstration of MUSE in Washington, US President Ronald Reagan
Ronald Reagan
was impressed and officially declared it "a matter of national interest" to introduce HDTV to the US.[7] Several systems were proposed as the new standard for the US, including the Japanese MUSE system, but all were rejected by the FCC because of their higher bandwidth requirements. At this time, the number of television channels was growing rapidly and bandwidth was already a problem. A new standard had to be more efficient, needing less bandwidth for HDTV than the existing NTSC. Demise of analog HD systems[edit] The limited standardization of analog HDTV in the 1990s did not lead to global HDTV adoption as technical and economic constraints at the time did not permit HDTV to use bandwidths greater than normal television. Early HDTV commercial experiments, such as NHK's MUSE, required over four times the bandwidth of a standard-definition broadcast. Despite efforts made to reduce analog HDTV to about twice the bandwidth of SDTV, these television formats were still distributable only by satellite. In addition, recording and reproducing an HDTV signal was a significant technical challenge in the early years of HDTV (Sony HDVS). Japan remained the only country with successful public broadcasting of analog HDTV, with seven broadcasters sharing a single channel. Rise of digital compression[edit] Since 1972, International Telecommunication Union's radio telecommunications sector (ITU-R) had been working on creating a global recommendation for Analog HDTV. These recommendations, however, did not fit in the broadcasting bands which could reach home users. The standardization of MPEG-1
MPEG-1
in 1993 also led to the acceptance of recommendations ITU-R BT.709.[8] In anticipation of these standards the Digital Video Broadcasting
Digital Video Broadcasting
(DVB) organisation was formed, an alliance of broadcasters, consumer electronics manufacturers and regulatory bodies. The DVB develops and agrees upon specifications which are formally standardised by ETSI.[9] DVB created first the standard for DVB-S digital satellite TV, DVB-C digital cable TV and DVB-T
DVB-T
digital terrestrial TV. These broadcasting systems can be used for both SDTV and HDTV. In the US the Grand Alliance proposed ATSC
ATSC
as the new standard for SDTV and HDTV. Both ATSC
ATSC
and DVB were based on the MPEG-2
MPEG-2
standard, although DVB systems may also be used to transmit video using the newer and more efficient H.264/MPEG-4 AVC
H.264/MPEG-4 AVC
compression standards. Common for all DVB standards is the use of highly efficient modulation techniques for further reducing bandwidth, and foremost for reducing receiver-hardware and antenna requirements. In 1983, the International Telecommunication Union's radio telecommunications sector (ITU-R) set up a working party (IWP11/6) with the aim of setting a single international HDTV standard. One of the thornier issues concerned a suitable frame/field refresh rate, the world already having split into two camps, 25/50 Hz and 30/60 Hz, largely due to the differences in mains frequency. The IWP11/6 working party considered many views and throughout the 1980s served to encourage development in a number of video digital processing areas, not least conversion between the two main frame/field rates using motion vectors, which led to further developments in other areas. While a comprehensive HDTV standard was not in the end established, agreement on the aspect ratio was achieved. Initially the existing 5:3 aspect ratio had been the main candidate but, due to the influence of widescreen cinema, the aspect ratio 16:9 (1.78) eventually emerged as being a reasonable compromise between 5:3 (1.67) and the common 1.85 widescreen cinema format. An aspect ratio of 16:9 was duly agreed upon at the first meeting of the IWP11/6 working party at the BBC's Research and Development establishment in Kingswood Warren. The resulting ITU-R Recommendation ITU-R BT.709-2 ("Rec. 709") includes the 16:9 aspect ratio, a specified colorimetry, and the scan modes 1080i
1080i
(1,080 actively interlaced lines of resolution) and 1080p
1080p
(1,080 progressively scanned lines). The British Freeview HD
Freeview HD
trials used MBAFF, which contains both progressive and interlaced content in the same encoding. It also includes the alternative 1440×1152 HDMAC
HDMAC
scan format. (According to some reports, a mooted 750-line (720p) format (720 progressively scanned lines) was viewed by some at the ITU as an enhanced television format rather than a true HDTV format,[10] and so was not included, although 1920× 1080i
1080i
and 1280× 720p
720p
systems for a range of frame and field rates were defined by several US SMPTE standards.) Inaugural HDTV broadcast in the United States[edit] HDTV technology was introduced in the United States in the late 1980s and made official in 1993 by the Digital HDTV Grand Alliance, a group of television, electronic equipment, communications companies consisting of AT&T Bell Labs, General Instrument, Philips, Sarnoff, Thomson, Zenith and the Massachusetts Institute of Technology. Field testing of HDTV at 199 sites in the United States was completed August 14, 1994.[11] The first public HDTV broadcast in the United States occurred on July 23, 1996 when the Raleigh, North Carolina television station WRAL-HD
WRAL-HD
began broadcasting from the existing tower of WRAL-TV
WRAL-TV
southeast of Raleigh, winning a race to be first with the HD Model Station in Washington, D.C., which began broadcasting July 31, 1996 with the callsign WHD-TV, based out of the facilities of NBC
NBC
owned and operated station WRC-TV.[12][13][14] The American Advanced Television Systems Committee
Advanced Television Systems Committee
(ATSC) HDTV system had its public launch on October 29, 1998, during the live coverage of astronaut John Glenn's return mission to space on board the Space Shuttle Discovery.[15] The signal was transmitted coast-to-coast, and was seen by the public in science centers, and other public theaters specially equipped to receive and display the broadcast.[15][16] The first HDTV logo was created by Washington, DC-based advertising firm Don Schaaf & Friends, Inc. European HDTV broadcasts[edit] The first HDTV transmissions in Europe, albeit not direct-to-home, began in 1990, when the Italian broadcaster RAI
RAI
used the HD-MAC and MUSE HDTV technologies to broadcast the 1990 FIFA World Cup. The matches were shown in 8 cinemas in Italy, where the tournament was played, and 2 in Spain. The connection with Spain was made via the Olympus satellite link from Rome
Rome
to Barcelona
Barcelona
and then with a fiber optic connection from Barcelona
Barcelona
to Madrid.[17] After some HDTV transmissions in Europe the standard was abandoned in the mid-1990s. The first regular broadcasts started on January 1, 2004 when the Belgian company Euro1080
Euro1080
launched the HD1 channel with the traditional Vienna New Year's Concert. Test transmissions had been active since the IBC exhibition in September 2003, but the New Year's Day broadcast marked the official launch of the HD1 channel, and the official start of direct-to-home HDTV in Europe.[18] Euro1080, a division of the former and now bankrupt Belgian TV services company Alfacam, broadcast HDTV channels to break the pan-European stalemate of "no HD broadcasts mean no HD TVs bought means no HD broadcasts ..." and kick-start HDTV interest in Europe.[19] The HD1 channel was initially free-to-air and mainly comprised sporting, dramatic, musical and other cultural events broadcast with a multi-lingual soundtrack on a rolling schedule of 4 or 5 hours per day. These first European HDTV broadcasts used the 1080i
1080i
format with MPEG-2 compression on a DVB-S signal from SES's Astra 1H
Astra 1H
satellite. Euro1080 transmissions later changed to MPEG-4/AVC compression on a DVB-S2 signal in line with subsequent broadcast channels in Europe. Despite delays in some countries,[20] the number of European HD channels and viewers has risen steadily since the first HDTV broadcasts, with SES's annual Satellite Monitor market survey for 2010 reporting more than 200 commercial channels broadcasting in HD from Astra satellites, 185 million HD capable TVs sold in Europe (£60 million in 2010 alone), and 20 million households (27% of all European digital satellite TV homes) watching HD satellite broadcasts (16 million via Astra satellites).[21] In December 2009 the United Kingdom
United Kingdom
became the first European country to deploy high definition content using the new DVB-T2
DVB-T2
transmission standard, as specified in the Digital TV Group (DTG) D-book, on digital terrestrial television. The Freeview HD
Freeview HD
service currently contains 13 HD channels (as of April 2016[update]) and was rolled out region by region across the UK in accordance with the digital switchover process, finally being completed in October 2012. However, Freeview HD
Freeview HD
is not the first HDTV service over digital terrestrial television in Europe; Italy's Rai HD channel started broadcasting in 1080i
1080i
on April 24, 2008 using the DVB-T
DVB-T
transmission standard. In October 2008 France
France
deployed five high definition channels using DVB-T
DVB-T
transmission standard on digital terrestrial distribution. Notation[edit] HDTV broadcast systems are identified with three major parameters:

Frame size in pixels is defined as number of horizontal pixels × number of vertical pixels, for example 1280 × 720 or 1920 × 1080. Often the number of horizontal pixels is implied from context and is omitted, as in the case of 720p
720p
and 1080p. Scanning system is identified with the letter p for progressive scanning or i for interlaced scanning. Frame rate is identified as number of video frames per second. For interlaced systems, the number of frames per second should be specified, but it is not uncommon to see the field rate incorrectly used instead.

If all three parameters are used, they are specified in the following form: [frame size][scanning system][frame or field rate] or [frame size]/[frame or field rate][scanning system].[22] Often, frame size or frame rate can be dropped if its value is implied from context. In this case, the remaining numeric parameter is specified first, followed by the scanning system. For example, 1920×1080p25 identifies progressive scanning format with 25 frames per second, each frame being 1,920 pixels wide and 1,080 pixels high. The 1080i25 or 1080i50 notation identifies interlaced scanning format with 25 frames (50 fields) per second, each frame being 1,920 pixels wide and 1,080 pixels high. The 1080i30 or 1080i60 notation identifies interlaced scanning format with 30 frames (60 fields) per second, each frame being 1,920 pixels wide and 1,080 pixels high. The 720p60 notation identifies progressive scanning format with 60 frames per second, each frame being 720 pixels high; 1,280 pixels horizontally are implied. 50 Hz systems support three scanning rates: 50i, 25p and 50p. 60 Hz systems support a much wider set of frame rates: 59.94i, 60i, 23.976p, 24p, 29.97p, 30p, 59.94p and 60p. In the days of standard definition television, the fractional rates were often rounded up to whole numbers, e.g. 23.976p was often called 24p, or 59.94i was often called 60i. 60 Hz high definition television supports both fractional and slightly different integer rates, therefore strict usage of notation is required to avoid ambiguity. Nevertheless, 29.97p/59.94i is almost universally called 60i, likewise 23.976p is called 24p. For the commercial naming of a product, the frame rate is often dropped and is implied from context (e.g., a 1080i
1080i
television set). A frame rate can also be specified without a resolution. For example, 24p means 24 progressive scan frames per second, and 50i means 25 interlaced frames per second.[23] There is no single standard for HDTV color support. Colors are typically broadcast using a (10-bits per channel) YUV
YUV
color space but, depending on the underlying image generating technologies of the receiver, are then subsequently converted to a RGB
RGB
color space using standardized algorithms. When transmitted directly through the Internet, the colors are typically pre-converted to 8-bit RGB
RGB
channels for additional storage savings with the assumption that it will only be viewed only on a (sRGB) computer screen. As an added benefit to the original broadcasters, the losses of the pre-conversion essentially make these files unsuitable for professional TV re-broadcasting. Most HDTV systems support resolutions and frame rates defined either in the ATSC
ATSC
table 3, or in EBU specification. The most common are noted below. Display resolutions[edit]

Video
Video
format supported [image resolution] Native resolution [inherent resolution] (W×H) Pixels Aspect ratio (W:H) Description

Actual Advertised (Megapixels) Image Pixel

720p (HD Ready) 1280×720 1024×768 XGA 786,432 0.8 4:3 1:1 Typically a PC resolution (XGA); also a native resolution on many entry-level plasma displays with non-square pixels.

1280×720 921,600 0.9 16:9 1:1 Standard HDTV resolution and a typical PC resolution (WXGA), frequently used by high-end video projectors; also used for 750-line video, as defined in SMPTE
SMPTE
296M, ATSC
ATSC
A/53, ITU-R BT.1543.

1366×768 WXGA 1,049,088 1.0 683:384 (approx. 16:9) 1:1 A typical PC resolution (WXGA); also used by many HD ready
HD ready
TV displays based on LCD technology.

1080p/1080i (Full HD) 1920×1080 1920×1080 2,073,600 2.1 16:9 1:1 Standard HDTV resolution, used by Full HD
Full HD
and HD ready
HD ready
1080p
1080p
TV displays such as high-end LCD, plasma and rear projection TVs, and a typical PC resolution (lower than WUXGA); also used for 1125-line video, as defined in SMPTE
SMPTE
274M, ATSC
ATSC
A/53, ITU-R BT.709;

Video
Video
format supported Screen resolution (W×H) Pixels Aspect ratio (W:H) Description

Actual Advertised (Megapixels) Image Pixel

720p (HD Ready) 1280×720 1248×702 Clean Aperture 876,096 0.9 16:9 1:1 Used for 750-line video with faster artifact/overscan compensation, as defined in SMPTE
SMPTE
296M.

1080i (Full HD) 1920×1080 1440×1080 HDCAM/HDV 1,555,200 1.6 16:9 4:3 Used for anamorphic 1125-line video in the HDCAM
HDCAM
and HDV
HDV
formats introduced by Sony
Sony
and defined (also as a luminance subsampling matrix) in SMPTE
SMPTE
D11.

1080p (Full HD) 1920×1080 1888×1062 Clean aperture 2,005,056 2.0 16:9 1:1 Used for 1124-line video with faster artifact/overscan compensation, as defined in SMPTE
SMPTE
274M.

At a minimum, HDTV has twice the linear resolution of standard-definition television (SDTV), thus showing greater detail than either analog television or regular DVD. The technical standards for broadcasting HDTV also handle the 16:9 aspect ratio images without using letterboxing or anamorphic stretching, thus increasing the effective image resolution. A very high resolution source may require more bandwidth than available in order to be transmitted without loss of fidelity. The lossy compression that is used in all digital HDTV storage and transmission systems will distort the received picture, when compared to the uncompressed source. Standard frame or field rates[edit] ATSC
ATSC
and DVB define the following frame rates for use with the various broadcast standards:[24][25]

23.976 Hz (film-looking frame rate compatible with NTSC
NTSC
clock speed standards) 24 Hz (international film and ATSC
ATSC
high-definition material) 25 Hz ( PAL
PAL
film, DVB standard-definition and high-definition material) 29.97 Hz ( NTSC
NTSC
film and standard-definition material) 30 Hz ( NTSC
NTSC
film, ATSC
ATSC
high-definition material) 50 Hz (DVB high-definition material) 59.94 Hz ( ATSC
ATSC
high-definition material) 60 Hz ( ATSC
ATSC
high-definition material)

The optimum format for a broadcast depends upon the type of videographic recording medium used and the image's characteristics. For best fidelity to the source the transmitted field ratio, lines, and frame rate should match those of the source. PAL, SECAM
SECAM
and NTSC
NTSC
frame rates technically apply only to analogue standard definition television, not to digital or high definition broadcasts. However, with the roll out of digital broadcasting, and later HDTV broadcasting, countries retained their heritage systems. HDTV in former PAL
PAL
and SECAM
SECAM
countries operates at a frame rate of 25/50 Hz, while HDTV in former NTSC
NTSC
countries operates at 30/60 Hz.[26] Types of media[edit] Standard 35mm photographic film used for cinema projection has a much higher image resolution than HDTV systems, and is exposed and projected at a rate of 24 frames per second (frame/s). To be shown on standard television, in PAL-system countries, cinema film is scanned at the TV rate of 25 frame/s, causing a speedup of 4.1 percent, which is generally considered acceptable. In NTSC-system countries, the TV scan rate of 30 frame/s would cause a perceptible speedup if the same were attempted, and the necessary correction is performed by a technique called 3:2 Pulldown: Over each successive pair of film frames, one is held for three video fields (1/20 of a second) and the next is held for two video fields (1/30 of a second), giving a total time for the two frames of 1/12 of a second and thus achieving the correct average film frame rate. See also: Telecine Non-cinematic HDTV video recordings intended for broadcast are typically recorded either in 720p
720p
or 1080i
1080i
format as determined by the broadcaster. 720p
720p
is commonly used for Internet distribution of high-definition video, because most computer monitors operate in progressive-scan mode. 720p
720p
also imposes less strenuous storage and decoding requirements compared to both 1080i
1080i
and 1080p. 1080p/24, 1080i/30, 1080i/25, and 720p/30 is most often used on Blu-ray
Blu-ray
Disc. Modern systems[edit] Main article: Large-screen television technology In the US, residents in the line of sight of television station broadcast antennas can receive free, over the air programming with a television set with an ATSC
ATSC
tuner (most sets sold since 2009 have this). This is achieved with a TV aerial, just as it has been since the 1940s except now the major network signals are broadcast in high definition (ABC, Fox, and Ion Television broadcast at 720p
720p
resolution; CBS, My Network TV, NBC, PBS at 1080i; and The CW at either resolution depending on the local affiliate). As their digital signals more efficiently use the broadcast channel, many broadcasters are adding multiple channels to their signals. Laws about antennas were updated before the change to digital terrestrial broadcasts. These new laws prohibit home owners' associations and city government from banning the installation of antennas. Additionally, cable-ready TV sets can display HD content without using an external box. They have a QAM tuner built-in and/or a card slot for inserting a CableCARD.[27] High-definition image sources include terrestrial broadcast, direct broadcast satellite, digital cable, IPTV
IPTV
(including GoogleTV, Roku boxes and AppleTV or built into "Smart Televisions"), Blu-ray
Blu-ray
video disc (BD), and internet downloads. Sony's PlayStation 3
PlayStation 3
has extensive HD compatibility because of its built in Blu-ray
Blu-ray
disc based player, so does Microsoft's Xbox 360
Xbox 360
with the addition of Netflix
Netflix
and Windows Media Center
Windows Media Center
HTPC
HTPC
streaming capabilities. On November 18, 2012, Nintendo released a next generation high definition gaming platform, The Wii U, which includes TV remote control features in addition to IPTV
IPTV
streaming features like Netflix. The HD capabilities of the consoles has influenced some developers to port games from past consoles onto the PS3, Xbox 360
Xbox 360
and Wii U, often with remastered or upscaled graphics. Recording and compression[edit] Main article: High-definition pre-recorded media and compression HDTV can be recorded to D-VHS
D-VHS
(Digital-VHS or Data-VHS), W-VHS
W-VHS
(analog only), to an HDTV-capable digital video recorder (for example DirecTV's high-definition Digital video recorder, Sky HD's set-top box, Dish Network's VIP 622 or VIP 722 high-definition Digital video recorder receivers, or TiVo's Series 3 or HD recorders), or an HDTV-ready HTPC. Some cable boxes are capable of receiving or recording two or more broadcasts at a time in HDTV format, and HDTV programming, some included in the monthly cable service subscription price, some for an additional fee, can be played back with the cable company's on-demand feature. The massive amount of data storage required to archive uncompressed streams meant that inexpensive uncompressed storage options were not available to the consumer. In 2008, the Hauppauge 1212 Personal Video Recorder was introduced. This device accepts HD content through component video inputs and stores the content in MPEG-2
MPEG-2
format in a .ts file or in a Blu-ray
Blu-ray
compatible format .m2ts file on the hard drive or DVD
DVD
burner of a computer connected to the PVR through a USB 2.0 interface. More recent systems are able to record a broadcast high definition program in its 'as broadcast' format or transcode to a format more compatible with Blu-ray. Analog tape recorders with bandwidth capable of recording analog HD signals, such as W-VHS
W-VHS
recorders, are no longer produced for the consumer market and are both expensive and scarce in the secondary market. In the United States, as part of the FCC's plug and play agreement, cable companies are required to provide customers who rent HD set-top boxes with a set-top box with "functional" FireWire
FireWire
(IEEE 1394) on request. None of the direct broadcast satellite providers have offered this feature on any of their supported boxes, but some cable TV companies have. As of July 2004[update], boxes are not included in the FCC mandate. This content is protected by encryption known as 5C.[28] This encryption can prevent duplication of content or simply limit the number of copies permitted, thus effectively denying most if not all fair use of the content. See also[edit]

Display motion blur Glossary of video terms High Efficiency Video
Video
Coding List of digital television deployments by country Optimum HDTV viewing distance Ultra-high-definition television

References[edit]

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and PAL
PAL
Still Matter With HDTV, About.com, retrieved 2011-12-09  ^ "HDTV information".  ^ "5C Digital Transmission Content Protection White Paper" (PDF). 1998-07-14. Archived from the original (PDF) on 2006-06-16. Retrieved 2006-06-20. 

Further reading[edit]

Joel Brinkley (1997), Defining Vision: The Battle for the Future of Television, New York: Harcourt Brace. High Definition Television: The Creation, Development and Implementation of HDTV Technology by Philip J. Cianci (McFarland & Company, 2012) Technology, Television, and Competition (New York: Cambridge University Press, 2004)

External links[edit]

Wikimedia Commons has media related to High-definition television.

History

The Italian HDTV experience from 1980s to 2006 - in Italian - C.R.I.T./RAI The HDTV Archive Project

European adoption

Images formats for HDTV, article from the EBU Technical Review. High Definition for Europe – a progressive approach, article from the EBU Technical Review. High Definition (HD) Image Formats for Television Production, technical report from the EBU

v t e

Digital video resolutions

Designation

Usage examples Definition (lines) Rate (Hz)

Interlaced
Interlaced
(fields) Progressive (frames)

Low, MP@LL

LDTV, VCD, HTV 240, 288 (SIF)   24, 30; 25

Standard, MP@ML

SDTV, SVCD, DVD, DV 480 (NTSC), 576 (PAL) 60, 50 24, 30; 25

Enhanced, HMP@HML

EDTV 480 (NTSC-HQ), 576   60, 50

High, MP@HL

HDTV, BD, HD DVD, HDV 720   24, 30, 60; 25, 50

1080 25, 30 24, 50, 60

Ultra-high

UHDTV 2160, 4320   60, 120,180

v t e

High-definition (HD)

Concepts

High-definition television High-definition video Ultra-high-definition television

Analog broadcast (All defunct)

819 line
819 line
system HD MAC MUSE (Hi-Vision)

Digital broadcast

ATSC DMB-T/H DVB ISDB SBTVD

Audio

Dolby Digital Surround sound DSD DXD DTS

Filming and storage

DCI HDV

HD media and compression

Blu-ray CBHD D-VHS DVD-Audio H.264 H.265 HD DVD HD VMD MPEG-2 MVC Super Audio CD Ultra HD Blu-ray Uncompressed VC-1

Connectors

Component DisplayPort DVI HDMI VGA

Deployments

List of digital television deployments by country

v t e

Broadcast video formats

Television

Analog

525 lines

System M NTSC NTSC-J PAL-M

625 lines

PAL

System B System D System G System H System I System K

PAL-N PALplus SECAM

System B System D System G System K System L (SECAM-L)

Audio

BTSC (MTS) EIAJ NICAM SAP Sound-in-Syncs Zweikanalton
Zweikanalton
(A2/IGR)

Hidden signals

Captioning CGMS-A EPG GCR PDC Teletext VBI VEIL VIT VITC WSS XDS

Historical

Pre-1940 Mechanical television 180-line 405-line

System A

441-line 819-line MAC MUSE

Digital

Interlaced

SDTV

480i 576i

HDTV

1080i

Progressive

LDTV

1seg 240p 288p

EDTV

480p 576p

HDTV

720p 1080p

UHDTV

2160p 4320p

MPEG-2
MPEG-2
standards

ATSC DVB ISDB DTMB DVB 3D-TV

MPEG-4 AVC standards

ATSC
ATSC
A/72 DMB DTMB DVB SBTVD 1seg

HEVC standards

ATSC
ATSC
3.0

Audio

AC-3 (5.1) DTS MPEG-1
MPEG-1
Audio Layer II MPEG Multichannel PCM LPCM AAC HE-AAC

Hidden signals

AFD Broadcast flag Captioning CPCM EPG Teletext

Technical issues

14:9 compromise Broadcast-safe Digital cinema
Digital cinema
(DCI) Display motion blur Moving image formats MPEG transport stream Reverse Standards Conversion Standards conversion Television transmitter Video
Video
on demand Video
Video
processing Widescreen signaling Templates (A

.