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LaserDisc
LaserDisc
(abbreviated as LD) is a home video format and the first commercial optical disc storage medium, initially licensed, sold and marketed as MCA DiscoVision in North America
North America
in 1978. Although the format was capable of offering higher-quality video and audio than its consumer rivals, VHS
VHS
and Betamax
Betamax
videotape, LaserDisc
LaserDisc
never managed to gain widespread use in North America, largely due to high costs for the players and video titles themselves and the inability to record TV programs.[1] It was not a popular format in Europe
Europe
and Australia
Australia
when first released, but eventually did gain traction in these regions to become popular in the 1990s. By contrast, the format was much more popular in Japan
Japan
and in the more affluent regions of Southeast Asia, such as Hong Kong, Singapore
Singapore
and Malaysia, and was the prevalent rental video medium in Hong Kong
Hong Kong
during the 1990s.[2] Its superior video and audio quality made it a popular choice among videophiles and film enthusiasts during its lifespan.[3] The technologies and concepts behind LaserDisc
LaserDisc
were the foundation for later optical disc formats including Compact Disc
Compact Disc
(CD), DVD
DVD
and Blu-ray
Blu-ray
(BD).

Contents

1 History 2 Design

2.1 Audio

3 LaserDisc
LaserDisc
players

3.1 Notable players

4 Branding

4.1 Pioneer 4.2 MCA

5 Comparison with other formats

5.1 VHS 5.2 DVD 5.3 Advantages 5.4 Disadvantages

6 Impact and decline 7 Further developments and applications

7.1 Computer control 7.2 Computer games 7.3 MUSE LD 7.4 Picture discs 7.5 LD-G 7.6 Anamorphic LaserDiscs 7.7 Recordable formats

8 LaserDisc
LaserDisc
sizes 9 See also 10 References 11 Further reading 12 External links

History[edit] Optical video recording technology, using a transparent disc,[4] was invented by David Paul Gregg and James Russell in 1958 (and patented in 1961 and 1990).[5][6] The Gregg patents were purchased by MCA in 1968. By 1969, Philips
Philips
had developed a videodisc in reflective mode, which has advantages over the transparent mode. MCA and Philips
Philips
then decided to combine their efforts and first publicly demonstrated the video disc in 1972. LaserDisc
LaserDisc
was first available on the market, in Atlanta, Georgia, on December 15, 1978,[7] two years after the introduction of the VHS
VHS
VCR, and four years before the introduction of the CD (which is based on laser disc technology). Initially licensed, sold, and marketed as MCA DiscoVision (also known as simply "DiscoVision") in North America
North America
in 1978, the technology was previously referred to internally as Optical Videodisc
Videodisc
System, Reflective Optical Videodisc, Laser Optical Videodisc, and Disco-Vision (with a dash), with the first players referring to the format as " Video
Video
Long Play". Pioneer Electronics
Pioneer Electronics
later purchased the majority stake in the format and marketed it as both LaserVision
LaserVision
(format name) and LaserDisc
LaserDisc
(brand name) in 1980, with some releases unofficially referring to the medium as "Laser Videodisc". Philips
Philips
produced the players while MCA produced the discs. The Philips-MCA cooperation was not successful, and discontinued after a few years. Several of the scientists responsible for the early research (Richard Wilkinson, Ray Dakin and John Winslow) founded Optical Disc Corporation (now ODC Nimbus). In 1979, the Museum of Science and Industry in Chicago opened its "Newspaper" exhibit which used interactive LaserDiscs to allow visitors to search for the front page of any Chicago Tribune newspaper. This was a very early example of public access to electronically stored information in a museum. In 1984, Sony
Sony
introduced a LaserDisc
LaserDisc
format that could store any form of digital data, as a data storage device similar to CD-ROM, with a large capacity 3.28 GiB,[8] comparable to the later DVD-ROM
DVD-ROM
format. The first LaserDisc
LaserDisc
title marketed in North America
North America
was the MCA DiscoVision release of Jaws in 1978.[9] The last title released in North America
North America
was Paramount's Bringing Out the Dead
Bringing Out the Dead
in 2000.[10] The last Japanese released movie was the Hong Kong
Hong Kong
film Tokyo Raiders
Tokyo Raiders
from Golden Harvest. A dozen or so more titles continued to be released in Japan, until the end of 2001. Production of LaserDisc
LaserDisc
players continued until January 14, 2009, when Pioneer stopped making them.[11][12][13] It was estimated that in 1998, LaserDisc
LaserDisc
players were in approximately 2% of U.S. households (roughly two million).[14] By comparison, in 1999, players were in 10% of Japanese households.[15] LaserDisc
LaserDisc
was released on June 10, 1981 in Japan[clarification needed], and a total of 3.6 million LaserDisc
LaserDisc
players were sold there.[16] A total of 16.8 million LaserDisc
LaserDisc
players were sold worldwide, of which 9.5 million were sold by Pioneer.[11][12][13] By the early 2000s, LaserDisc
LaserDisc
was completely replaced by DVD
DVD
in the North American retail marketplace, as neither players nor software were then produced. Players were still exported to North America
North America
from Japan
Japan
until the end of 2001. The format has retained some popularity among American collectors, and to a greater degree in Japan, where the format was better supported and more prevalent during its life. In Europe, LaserDisc
LaserDisc
always remained an obscure format. It was chosen by the British Broadcasting Corporation
British Broadcasting Corporation
(BBC) for the BBC Domesday Project in the mid-1980s, a school-based project to commemorate 900 years since the original Domesday Book
Domesday Book
in England. From 1991 until the early 2000s, the BBC also used LaserDisc
LaserDisc
technology to play out the channel idents. Design[edit]

Comparison of several forms of disc storage showing tracks (not to scale); green denotes start and red denotes end. Some CD-R(W) and DVD-R(W)/DVD+R(W) recorders operate in ZCLV, CAA or CAV modes

The standard home video LaserDisc
LaserDisc
was 30 cm (12 in) in diameter and made up of two single-sided aluminum discs layered in plastic. Although appearing similar to compact discs or DVDs, LaserDiscs used analog video stored in the composite domain (having a video bandwidth approximately equivalent to the 1-inch (25 mm) C-Type VTR format) with analog FM stereo sound and PCM digital audio. The LaserDisc
LaserDisc
at its most fundamental level was still recorded as a series of pits and lands much like CDs, DVDs, and even Blu-ray
Blu-ray
Discs are today. However, while the encoding is of a binary nature, the information is encoded as analog pulse-width modulation with a 50% duty cycle, where the information is contained in the lengths and spacing of the pits. In true digital media the pits, or their edges, directly represent 1s and 0s of a binary digital information stream.[17] Early LaserDiscs featured in 1978 were entirely analog but the format evolved to incorporate digital stereo sound in CD format (sometimes with a TOSlink or coax output to feed an external DAC), and later multi-channel formats such as Dolby Digital
Dolby Digital
and DTS. Since digital encoding and compression schemes were either unavailable or impractical in 1978, three encoding formats based on the rotation speed were used:

Constant Angular Velocity LaserDisc
LaserDisc
showing the NTSC
NTSC
field setup and individual scanlines. Each rotation has two such regions.

CAV Constant angular velocity
Constant angular velocity
or Standard Play discs supported several unique features such as freeze frame, variable slow motion and reverse. CAV discs were spun at a constant rotational speed (1800 rpm for 525 line and 1500 rpm for 625 line discs)[18] during playback, with one video frame read per revolution. In this mode, 54,000 individual frames (30 minutes of audio/video for NTSC, 36 minutes for PAL) could be stored on a single side of a CAV disc. Another unique attribute to CAV was to reduce the visibility of crosstalk from adjacent tracks, since on CAV discs any crosstalk at a specific point in a frame is simply from the same point in the next or previous frame. CAV was used less frequently than CLV, and reserved for special editions of feature films to highlight bonus material and special effects. One of the most intriguing advantages of this format was the ability to reference every frame of a film directly by number, a feature of particular interest to film buffs, students and others intrigued by the study of errors in staging, continuity and so on. CLV Constant linear velocity
Constant linear velocity
or Extended Play
Extended Play
discs do not have the "trick play" features of CAV, offering only simple playback on all but the high-end LaserDisc
LaserDisc
players incorporating a digital frame store. These high-end LaserDisc
LaserDisc
players could add features not normally available to CLV discs such as variable forward and reverse, and a VCR-like "pause". By gradually slowing down their rotational speed (1,800–600 rpm)[18] CLV encoded discs could store 60 minutes of audio/video per side for NTSC
NTSC
(64 minutes for PAL), or two hours per disc. For films with a run–time less than 120 minutes, this meant they could fit on one disc, lowering the cost of the title and eliminating the distracting exercise of "getting up to change the disc", at least for those who owned a dual-sided player. The vast majority of titles were only available in CLV (a few titles were released partly CLV, partly CAV. For example, a 140-minute movie could fit on two CLV sides and one CAV side, thus allowing for the CAV-only features during the climax of the film). CAA In the early 1980s, due to problems with crosstalk distortion on CLV extended play LaserDiscs, Pioneer Video
Video
introduced constant angular acceleration (CAA) formatting for extended play discs. CAA is very similar to CLV, save for the fact that CAA varies the angular rotation of the disc in controlled steps instead of gradually slowing down in a steady linear pace as a CLV disc is read. With the exception of 3M/Imation, all LaserDisc
LaserDisc
manufacturers adopted the CAA encoding scheme, although the term was rarely (if ever) used on any consumer packaging. CAA encoding noticeably improved picture quality and greatly reduced crosstalk and other tracking problems while being fully compatible with existing players.

As Pioneer introduced digital audio to LaserDisc
LaserDisc
in 1985, it further refined the CAA format. CAA55 was introduced in 1985 with a total playback capacity per side of 55 minutes 5 seconds, reducing the video capacity to resolve bandwidth issues with the inclusion of digital audio. Several titles released between 1985 and 1987 were analog audio only due to the length of the title and the desire to keep the film on one disc (e.g., Back to the Future). By 1987, Pioneer had overcome the technical challenges and was able to once again encode in CAA60, allowing a total of 60 minutes 5 seconds. Pioneer further refined CAA, offering CAA45, encoding 45 minutes of material, but filling the entire playback surface of the side. Used on only a handful of titles, CAA65 offered 65 minutes 5 seconds of playback time per side. There are a handful of titles pressed by Technidisc that used CAA50. The final variant of CAA is CAA70, which could accommodate 70 minutes of playback time per side. There are no known uses of this format on the consumer market. Audio[edit] Sound
Sound
could be stored in either analog or digital format and in a variety of surround sound formats; NTSC
NTSC
discs could carry two analog audio tracks, plus two uncompressed PCM digital audio tracks, which were (EFM, CIRC, 16-bit and 44.056 kHz sample rate).[19] PAL discs could carry one pair of audio tracks, either analog or digital and the digital tracks on a PAL
PAL
disc were 16-bit 44.1 kHz as on a CD; in the UK, the term "LaserVision" is used to refer to discs with analog sound, while "LaserDisc" is used for those with digital audio. The digital sound signal in both formats are EFM-encoded as in CD.[19] Dolby Digital
Dolby Digital
(also called AC-3) and DTS—which are now common on DVD titles—first became available on LaserDisc, and Star Wars: Episode I – The Phantom Menace (1999) which was released on LaserDisc
LaserDisc
in Japan, is among the first home video releases ever to include 6.1 channel Dolby Digital
Dolby Digital
EX Surround.[20] Unlike DVDs, which carry Dolby Digital audio
Digital audio
in digital form, LaserDiscs store Dolby Digital
Dolby Digital
in a frequency modulated form within a track normally used for analog audio. Extracting Dolby Digital
Dolby Digital
from a LaserDisc
LaserDisc
required a player equipped with a special "AC-3 RF" output and an external demodulator in addition to an AC-3 decoder. The demodulator was necessary to convert the 2.88 MHz modulated AC-3 information on the disc into a 384 kbit/s signal that the decoder could handle. DTS audio, when available on a disc, replaced the digital audio tracks; hearing DTS sound required only an S/PDIF
S/PDIF
compliant digital connection to a DTS decoder. In the mid to late 1990s many higher-end AV receivers included the demodulator circuit specifically for the LaserDisc
LaserDisc
players RF modulated Dolby Digital
Dolby Digital
AC-3 signal. By the late 1990s with LaserDisc players and disc sales declining due to DVD's growing popularity the AV receiver manufacturers removed the demodulator circuit. Although DVD
DVD
players were capable of playing Dolby Digital
Dolby Digital
tracks, the signals out of DVD
DVD
players were not in a modulated form and not compatible with the inputs designed for LaserDisc
LaserDisc
AC-3. Outboard demodulators were available for a period that convert the AC-3 signal to standard Dolby Digital
Dolby Digital
signal that was compatible with the standard Dolby Digital/PCM inputs on capable AV receivers. Another type marketed by Onkyo[21] and others converted the RF AC-3 signal to 6-channel analog audio. The two FM audio channels occupied the disc spectrum at 2.3 and 2.8 MHz on NTSC
NTSC
formatted discs and each channel had a 100 kHz FM deviation. The FM audio carrier frequencies were chosen to minimize their visibility in the video image, so that even with a poorly mastered disc, audio carrier beats in the video will be at least ‑35 dB down, and thus, invisible. Due to the frequencies chosen, the 2.8 MHz audio carrier (Right Channel) and the lower edge of the chroma signal are very close together and if filters are not carefully set during mastering, there can be interference between the two. In addition, high audio levels combined with high chroma levels can cause mutual interference, leading to beats becoming visible in highly saturated areas of the image. To help deal with this, Pioneer decided to implement the CX Noise Reduction System on the analog tracks. By reducing the dynamic range and peak levels of the audio signals stored on the disc, filtering requirements were relaxed and visible beats greatly reduced or eliminated. The CX system gives a total NR effect of 20 dB, but in the interest of better compatibility for non-decoded playback, Pioneer reduced this to only 14 dB of noise reduction (the RCA CED system used the "original" 20 dB CX system). This also relaxed calibration tolerances in players and helped reduce audible pumping if the CX decoder was not calibrated correctly. At least where the digital audio tracks were concerned, the sound quality was unsurpassed at the time compared to consumer videotape, but the quality of the analog soundtracks varied greatly depending on the disc and, sometimes, the player. Many early and lower-end LD players had poor analog audio components, and in turn many early discs had poorly mastered analog audio tracks, making digital soundtracks in any form desirable to serious enthusiasts. Early DiscoVision and LaserDisc
LaserDisc
titles lacked the digital audio option, but many of those movies received digital sound in later re-issues by Universal, and the quality of analog audio tracks generally got far better as time went on. Many discs that had originally carried old analog stereo tracks received new Dolby Stereo
Dolby Stereo
and Dolby Surround
Dolby Surround
tracks instead, often in addition to digital tracks, helping boost sound quality. Later analog discs also applied CX noise reduction, which improved the signal-noise ratio of their audio. On a DTS disc, digital PCM audio was not available, so if a DTS decoder was also not available, the only option is to fall back to the analog Dolby Surround
Dolby Surround
or stereo audio tracks. In some cases, the analog audio tracks were further made unavailable through replacement with supplementary audio such as isolated scores or audio commentary. This effectively reduced playback of a DTS disc on a non-DTS equipped system to mono audio, or in a handful of cases, no film soundtrack at all.[22] Only one 5.1 surround sound option exists on a given LaserDisc
LaserDisc
(either Dolby Digital
Dolby Digital
or DTS), so if surround sound is desired, the disc must be matched to the capabilities of the playback equipment (LD player and receiver/decoder) by the purchaser. A fully capable LaserDisc playback system includes a newer LaserDisc
LaserDisc
player that is capable of playing digital tracks, has a digital optical output for digital PCM and DTS audio, is aware of AC-3 audio tracks, and has an AC-3 coaxial output; an external or internal AC-3 RF demodulator and AC-3 decoder; and a DTS decoder. Many 1990s A/V receivers combined the AC-3 decoder and DTS decoder logic, but an integrated AC-3 demodulator is rare both in LaserDisc
LaserDisc
players and in later A/V receivers.[23] PAL
PAL
LaserDiscs have a slightly longer playing time than NTSC
NTSC
discs, but have fewer audio options. PAL
PAL
discs only have two audio tracks, consisting of either two analog-only tracks on older PAL
PAL
LDs, or two digital-only tracks on newer discs. In comparison, later NTSC
NTSC
LDs are capable of carrying four tracks (two analog and two digital). On certain releases, one of the analog tracks is used to carry a modulated AC-3 signal for 5.1 channel
5.1 channel
audio (for decoding and playback by newer LD players with an "AC-3 RF" output). However, older NTSC
NTSC
LDs made before 1984 (such as the original DiscoVision discs) only have two analog audio tracks. LaserDisc
LaserDisc
players[edit]

A top-loading, Magnavox-branded LaserDisc
LaserDisc
player with the lid open.

A CD, CDV, LD player PIONEER CLD-2950.

The earliest players employed gas helium–neon laser tubes to read discs and had a red-orange light with a wavelength of 632.8 nm, while later solid-state players used infrared semiconductor laser diodes with a wavelength of 780 nm. In March 1984, Pioneer introduced the first consumer player with a solid-state laser, the LD-700. It was also the first LD player to load from the front and not the top. One year earlier Hitachi introduced an expensive industrial player with a laser diode, but the player, which had poor picture quality due to an inadequate dropout compensator, was made only in limited quantities. After Pioneer released the LD-700, gas lasers were no longer used in consumer players, despite their advantages, although Philips
Philips
continued to use gas lasers in their industrial units until 1985. Most LaserDisc
LaserDisc
players required the user to manually turn the disc over to play the other side. A number of players (all diode laser based) were made that were capable of playing both sides of the disc automatically. Pioneer produced some multi-disc models that hold more than 50 LaserDiscs. One company offered, for a short time in 1984, a "LaserStack" unit that added multi-disc capability to existing players: the Pioneer LD-600, LD-1100 or the Sylvania/ Magnavox
Magnavox
clones. It requires the user to physically remove the player lid for installation and attached to the top of the player. LaserStack holds up to 10 discs and can automatically load or remove them from the player or change sides in around 15 seconds. The first mass-produced industrial LaserDisc
LaserDisc
player was the MCA DiscoVision PR-7820, later rebranded the Pioneer PR7820. In North America, this unit was used in many General Motors
General Motors
dealerships as a source of training videos and presentation of GM's new line of cars and trucks in the late 1970s and early 1980s. Most players made after the mid-1980s are capable of also playing Compact Discs. These players include a 4.7 in (12 cm) indentation in the loading tray, where the CD is placed for playback. At least two Pioneer models (the CLD-M301 and the CLD-M90) also operate as a CD changer, with several 4.7 in indentations around the circumference of the main tray. The Pioneer DVL-9, introduced in 1996, is both Pioneer's first consumer DVD
DVD
player and the first combination DVD/LD player. The first high-definition video player is the Pioneer HLD-X0. A later model, the HLD-X9, features a superior comb filter, and laser diodes on both sides of the disc. Notable players[edit]

Pioneer PR7820, first industrial LaserDisc
LaserDisc
player, capable of being controlled by an external computer, was used in the first US LaserDisc arcade game Dragon's Lair. Pioneer CLD-1010, first player capable of playing 5-inch (130 mm) CD-Video
CD-Video
discs. Released in 1987. Pioneer CLD-D703, a 1994 model with digital audio playback. Pioneer LaserActive
Pioneer LaserActive
players: The Pioneer CLD-A100 and NEC PCE-LD1 provided the ability to play Sega Genesis (Mega Drive) and TurboGrafx16 (PC Engine) video games when used in conjunction with additional components. Pioneer DVL series, capable of playing both LaserDiscs and DVDs

Branding[edit]

LaserVision/ LaserDisc
LaserDisc
certification mark

During its development, MCA, which co-owned the technology, referred to it as the Optical Videodisc
Videodisc
System, "Reflective Optical Videodisc" or "Laser Optical Videodisc", depending on the document; changing the name once in 1969 to Disco-Vision and then again in 1978 to DiscoVision (without the hyphen), which became the official spelling. Technical documents and brochures produced by MCA Disco-Vision during the early and mid-'70s also used the term "Disco-Vision Records" to refer to the pressed discs. MCA owned the rights to the largest catalog of films in the world during this time, and they manufactured and distributed the DiscoVision releases of those films under the "MCA DiscoVision" software and manufacturing label; consumer sale of those titles began on December 15, 1978, with the aforementioned Jaws. Philips' preferred name for the format was "VLP", after the Dutch words Video
Video
Langspeel-Plaat (" Video
Video
long-play disc"), which in English-speaking countries stood for Video
Video
Long-Play. The first consumer player, the Magnavox
Magnavox
VH-8000 even had the VLP logo on the player. For a while in the early and mid-1970s, Philips
Philips
also discussed a compatible audio-only format they called "ALP", but that was soon dropped as the Compact Disc
Compact Disc
system became a non-compatible project in the Philips
Philips
corporation. Until early 1980, the format had no "official" name. The LaserVision
LaserVision
Association, made up of MCA, Universal-Pioneer, IBM, and Philips/Magnavox, was formed to standardize the technical specifications of the format (which had been causing problems for the consumer market) and finally named the system officially as "LaserVision". After its introduction in Japan
Japan
in 1981, the format was introduced in Europe
Europe
in 1983 with the LaserVision
LaserVision
name although Philips
Philips
used "VLP" in model designations, such as VLP-600. Philips
Philips
tried renaming the entire format in 1987 to "CD-Video", and while the name and logo appeared on players and labels for years, the 'official' name of the format remained LaserVision. In the early 1990s, the format's name was finally changed to LaserDisc. Pioneer[edit] Pioneer Electronics
Pioneer Electronics
also entered the optical disc market in 1977 as a 50/50 joint-venture with MCA called Universal-Pioneer and manufacturing MCA designed industrial players under the MCA DiscoVision name (the PR-7800 and PR-7820). For the 1980 launch of the first Universal-Pioneer player, the VP-1000 was noted as a "laser disc player", although the "LaserDisc" logo displayed clearly on the device. In 1981, "LaserDisc" was used exclusively for the medium itself, although the official name was "LaserVision" (as seen at the beginning of many LaserDisc
LaserDisc
releases just before the start of the film). However, as Pioneer reminded numerous video magazines and stores in 1984, LaserDisc
LaserDisc
was a trademarked word, standing only for LaserVision
LaserVision
products manufactured for sale by Pioneer Video
Video
or Pioneer Electronics. A 1984 Ray Charles
Ray Charles
ad for the LD-700 player bore the term "Pioneer LaserDisc
LaserDisc
brand videodisc player". From 1981 until the early 1990s, all properly licensed discs carried the LaserVision
LaserVision
name and logo, even Pioneer Artists titles. On single sided LaserDiscs mastered by Pioneer, playing the wrong side will cause a still screen to appear with a happy, upside down turtle that has a LaserDisc
LaserDisc
for a stomach (nicknamed the " LaserDisc
LaserDisc
Turtle"). The words "Program material is recorded on the other side of this disc" are below the turtle.[24] Other manufacturers used a regular text message without graphics. MCA[edit] During the early years, MCA also manufactured discs for other companies including Paramount, Disney
Disney
and Warner Bros.
Warner Bros.
Some of them added their own names to the disc jacket to signify that the movie was not owned by MCA. After Discovision Associates shut down in early 1982, Universal Studio's videodisc software label, called MCA Videodisc
Videodisc
until 1984, began reissuing many DiscoVision titles. Unfortunately, quite a few, such as Battlestar Galactica and Jaws, were time-compressed versions of their CAV or CLV Disco Vision originals. The time-compressed CLV re-issue of Jaws no longer had the original soundtrack, having had incidental background music replaced for the video disc version due to licensing cost (the music would not be available until the THX LaserDisc
LaserDisc
box set was released in 1995). One Universal/Columbia co-production issued by MCA Disco Vision in both CAV and CLV versions, The Electric Horseman, is still not available in any other home video format with its original score intact; even the most recent DVD
DVD
release has had substantial music replacements of both instrumental score and Willie Nelson's songs. An MCA release of Universal's Howard the Duck sees only the start credits shown in widescreen before changing to 4:3 for the rest of the film. For many years this was the only disc-based release of the film, until widescreen DVD
DVD
formats were released with extras. Also, the LaserDisc release of E.T. the Extra-Terrestrial
E.T. the Extra-Terrestrial
is the only format to include the cut scene of Harrison Ford
Harrison Ford
playing the part of the school headmaster telling off Elliott for letting the frogs free in the biology class. Comparison with other formats[edit] For a comparison of consumer video resolutions, see List of common resolutions § Television. VHS[edit] LaserDisc
LaserDisc
had a number of advantages over VHS. It featured a far sharper picture with a horizontal resolution of 425 TVL lines for NTSC
NTSC
and 440 TVL lines for PAL
PAL
discs, while VHS
VHS
featured only 240 TVL lines[25] with NTSC. It could handle analog and digital audio where VHS
VHS
was mostly analog only ( VHS
VHS
can have PCM audio in professional applications but is uncommon), and the NTSC
NTSC
discs could store multiple audio tracks. This allowed for extras like director's commentary tracks and other features to be added onto a film, creating " Special
Special
Edition" releases that would not have been possible with VHS. Disc access was random and chapter based, like the DVD
DVD
format, meaning that one could jump to any point on a given disc very quickly. By comparison, VHS
VHS
would require tedious rewinding and fast-forwarding to get to specific points. LaserDiscs were initially cheaper than videocassettes to manufacture, because they lacked the moving parts and plastic outer shell that are necessary for VHS
VHS
tapes to work, and the duplication process was much simpler. A VHS
VHS
cassette has at least 14 parts including the actual tape while LaserDisc
LaserDisc
has one part with five or six layers. A disc can be stamped out in a matter of seconds whereas duplicating videotape required a complex bulk tape duplication mechanism and was a time-consuming process. However, by the end of the 1980s, average disc-pressing prices were over $5.00 per two-sided disc, due to the large amount of plastic material and the costly glass-mastering process needed to make the metal stamper mechanisms. Due to the larger volume of demand, videocassettes quickly became much cheaper to duplicate, costing as little as $1.00 by the beginning of the 1990s. LaserDiscs potentially had a much longer lifespan than videocassettes. Because the discs were read optically instead of magnetically, no physical contact needs to be made between the player and the disc, except for the player's clamp that holds the disc at its center as it is spun and read. As a result, playback would not wear the information-bearing part of the discs, and properly manufactured LDs would theoretically last beyond a lifetime. By contrast, a VHS
VHS
tape held all of its picture and sound information on the tape in a magnetic coating which is in contact with the spinning heads on the head drum, causing progressive wear with each use (though later in VHS's lifespan, engineering improvements allowed tapes to be made and played back without contact). The tape was also thin and delicate, and it was easy for a player mechanism, especially on a low quality or malfunctioning model, to mishandle the tape and damage it by creasing it, frilling (stretching) its edges, or even breaking it. DVD[edit] By the time of the advent of the DVD, LaserDisc
LaserDisc
had declined considerably in popularity, so the two formats never directly competed with each other. LaserDisc
LaserDisc
was a composite video format: the luminance (black and white) and chrominance (color) information were transmitted in one signal, separated by the receiver. While good comb filters can do so adequately, these two signals cannot be completely separated. On DVDs, data is stored in the form of digital blocks which make up each independent frame. The signal produced is dependent on the equipment used to master the disc. Signals range from composite and split, to YUV
YUV
and RGB. Depending upon which format is used, this can result in far higher fidelity, particularly at strong color borders or regions of high detail (especially if there is moderate movement in the picture) and low-contrast details like skin tones, where comb filters almost inevitably smudge some detail. In contrast to the entirely digital DVD, LaserDiscs use only analog video. As the LaserDisc
LaserDisc
format is not digitally encoded and does not make use of compression techniques, it is immune to video macroblocking (most visible as blockiness during high motion sequences) or contrast banding (subtle visible lines in gradient areas, such as out-of-focus backgrounds, skies, or light casts from spotlights) that can be caused by the MPEG-2
MPEG-2
encoding process as video is prepared for DVD. Early DVD
DVD
releases held the potential to surpass their LaserDisc
LaserDisc
counterparts, but often managed only to match them for image quality, and in some cases, the LaserDisc
LaserDisc
version was preferred. However, proprietary human-assisted encoders manually operated by specialists can vastly reduce the incidence of artifacts, depending on playing time and image complexity. By the end of LaserDisc's run, DVDs were living up to their potential as a superior format. DVDs use compressed audio formats such as Dolby Digital
Dolby Digital
and DTS for multichannel sound. Most LaserDiscs were encoded with stereo (often Dolby Surround) CD quality audio 16bit/44.1 kHz tracks as well as analog audio tracks.[26] DTS-encoded LaserDiscs have DTS soundtracks of 1,235 kbit/s instead of the reduced bitrate of 768 kbit/s commonly employed on DVDs with optional DTS audio. Advantages[edit] LaserDisc
LaserDisc
players can provide a great degree of control over the playback process. Unlike many DVD
DVD
players, the transport mechanism always obeys commands from the user: pause, fast-forward, and fast-reverse commands are always accepted (barring, of course, malfunctions). There were no "User Prohibited Options" where content protection code instructs the player to refuse commands to skip a specific part (such as fast forwarding through copyright warnings). (Some DVD
DVD
players, particularly higher-end units, do have the ability to ignore the blocking code and play the video without restrictions, but this feature is not common in the usual consumer market.) With CAV LaserDiscs, the user can jump directly to any individual frame of a video simply by entering the frame number on the remote keypad, a feature not common among DVD
DVD
players. Some DVD
DVD
players have cache features which stores a certain amount of the video in RAM which allows the player to index a DVD
DVD
as quickly as an LD, even down to the frame in some players. Damaged spots on a LaserDisc
LaserDisc
can be played through or skipped over, while a DVD
DVD
will often become unplayable past the damage. Some newer DVD
DVD
players feature a repair+skip algorithm, which alleviates this problem by continuing to play the disc, filling in unreadable areas of the picture with blank space or a frozen frame of the last readable image and sound. The success of this feature depends upon the amount of damage. LaserDisc
LaserDisc
players, when working in full analog, recover from such errors faster than DVD
DVD
players. Direct comparison here is almost impossible due to the sheer size differences between the two media. A 1 in (3 cm) scratch on a DVD
DVD
will probably cause more problems than a 1 in (3 cm) scratch on a LaserDisc, but a fingerprint taking up 1% of the area of a DVD
DVD
would almost certainly cause fewer problems than a similar mark covering 1% of the surface of a LaserDisc.[citation needed] Similar to the CD versus LP sound quality debates common in the audiophile community, some videophiles argue that LaserDisc
LaserDisc
maintains a "smoother", more "film-like", natural image while DVD
DVD
still looks slightly more artificial. Early DVD
DVD
demo discs often had compression or encoding problems, lending additional support to such claims at the time. However, the video signal-to-noise ratio and bandwidth of LaserDisc
LaserDisc
are substantially less than that of DVDs, making DVDs appear sharper and clearer to most viewers. Another advantage, at least to some consumers, was the lack of any sort of anti-piracy technology. It was claimed that Macrovision's Copyguard protection could not be applied to LaserDisc, due to the format's design. The vertical blanking interval, where the Macrovision signal would be implemented, was also used for timecode and/or frame coding as well as player control codes on LaserDisc
LaserDisc
players, so test discs with Macrovision
Macrovision
would not play at all. There was never a push to redesign the format despite the obvious potential for piracy due to its relatively small market share. The industry simply decided to engineer it into the DVD
DVD
specification. LaserDisc's support for multiple audio tracks allowed for vast supplemental materials to be included on-disc and made it the first available format for " Special
Special
Edition" releases; the 1984 Criterion Collection edition of Citizen Kane
Citizen Kane
is generally credited as being the first " Special
Special
Edition" release to home video,[citation needed] and for setting the standard by which future SE discs were measured. The disc provided interviews, commentary tracks, documentaries, still photographs, and other features for historians and collectors. Disadvantages[edit] Despite the advantages over competing technology at the time (namely VHS
VHS
and Betamax), the format does have drawbacks. The discs are heavy (weighing about 250 grams (half a pound) each), cumbersome, more prone than a VHS
VHS
tape to damage if mishandled, and manufacturers did not market LD units with recording capabilities to consumers. Also, because of their size, greater mechanical effort was required to spin the discs at the proper speed, resulting in much more noise generated than other media. The space-consuming analog video signal of a LaserDisc
LaserDisc
limited playback duration to 30/36 minutes (CAV NTSC/PAL) or 60/64 minutes (CLV NTSC/PAL) per side because of the hardware manufacturer's refusal to reduce line count for increased playtime. After one side was finished playing, a disc has to be flipped over to continue watching a movie, and some titles fill two or more discs. Many players, especially units built after the mid-1980s, can "flip" discs automatically by rotating the optical pickup to the other side of the disc, but this is accompanied by a pause in the movie during the side change. If the movie is longer than what could be stored on two sides of a single disc, manually swapping to a second disc is necessary at some point during the film. One exception to this rule is the Pioneer LD-W1, which features the ability to load two discs and to play each side of one disc and then to switch to playing each side of the other disc. In addition, perfect still frames and random access to individual still frames is limited only to the more expensive CAV discs, which only had a playing time of approximately 30 minutes per side. In later years, Pioneer and other manufacturers overcame this limitation by incorporating a digital memory buffer, which "grabbed" a single field or frame from a CLV disc. The analog information encoded on LaserDiscs does not include any form of built-in checksum or error correction. Because of this, slight dust and scratches on the disc surface can result in read-errors which cause various video quality problems: glitches, streaks, bursts of static, or momentary picture interruptions. In contrast, the digital MPEG-2
MPEG-2
format information used on DVDs has built-in error correction which ensures that the signal from a damaged disc will remain identical to that from a perfect disc right up until the point at which damage to the disc surface is so substantial that it prevents the laser from being able to identify usable data. In addition, LaserDisc
LaserDisc
videos sometimes exhibit a problem known as "crosstalk". The issue can arise when the laser optical pickup assembly within the player is out of alignment or because the disc is damaged or excessively warped, but it could also occur even with a properly functioning player and a factory-new disc, depending on electrical and mechanical alignment problems. In these instances, the issue arose due to the fact that CLV discs require subtle changes in rotating speed at various points during playback. During a change in speed, the optical pickup inside the player might read video information from a track adjacent to the intended one, causing data from the two tracks to "cross"; the extra video information picked up from that second track shows up as distortion in the picture which looks reminiscent of swirling "barber poles" or rolling lines of static. Assuming the player's optical pickup is in proper working order, crosstalk distortion normally does not occur during playback of CAV format LaserDiscs, as the rotational speed never varies. However, if the player calibration is out of order or if the CAV disc is faulty or damaged, other problems affecting tracking accuracy can occur. One such problem is "laser lock", where the player reads the same two fields for a given frame over and over again, causing the picture to look frozen as if the movie were paused. Another significant issue unique to LaserDisc
LaserDisc
is one involving the inconsistency of playback quality between different makers and models of player. On most televisions, a given DVD
DVD
player will produce a picture that is visually indistinguishable from other units. Differences in image quality between players only becomes easily apparent on large televisions and substantial leaps in image quality are generally only obtained with expensive, high-end players that allow for post-processing of the MPEG-2
MPEG-2
stream during playback. In contrast, LaserDisc
LaserDisc
playback quality is highly dependent on hardware quality. Major variances in picture quality appear between different makers and models of LD players, even when tested on a low to mid-range television. The obvious benefits of using high quality equipment has helped keep demand for some players high, thus also keeping pricing for those units comparably high. In the 1990s, notable players sold for anywhere from US$200 to well over $1,000, while older and less desirable players could be purchased in working condition for as little as $25. Main article: Laser rot Many early LDs were not manufactured properly; sometimes a substandard adhesive was used to sandwich together the two sides of the disc.[citation needed] The adhesive contained impurities that were able to penetrate the lacquer seal layer and chemically attack the metalized reflective aluminium layer, causing it to oxidize and lose its reflective characteristics. This was a problem that was termed "laser rot" among LD enthusiasts, also called "color flash" internally by LaserDisc-pressing plants. Some forms of laser rot could appear as black spots that looked like mold or burned plastic which cause the disc to skip and the movie to exhibit excessive speckling noise. But, for the most part, rotted discs could actually appear perfectly fine to the naked eye. Later optical standards have been known to suffer similar problems, including a notorious batch of defective CDs manufactured by Philips-DuPont Optical at their Blackburn, Lancashire facility in England during the late 1980s/early 1990s. Impact and decline[edit] LaserDisc
LaserDisc
did not have high market penetration in North America
North America
due to the high cost of the players and discs, which were far more expensive than VHS
VHS
players and tapes, and due to marketplace confusion with the technologically inferior CED, which also went by the name Videodisc. While the format was not widely adopted by North American consumers, it was well received among videophiles due to the superior audio and video quality compared to VHS
VHS
and Betamax
Betamax
tapes, finding a place in nearly one million American homes by the end of 1990.[27] The format was more popular in Japan
Japan
than in North America
North America
because prices were kept low to ensure adoption, resulting in minimal price differences between VHS
VHS
tapes and the higher quality LaserDiscs, helping ensure that it quickly became the dominant consumer video format in Japan. Anime
Anime
collectors in every country the LD format was released, which includes both North America
North America
and Japan, also quickly became familiar with this format, and sought the higher video and sound quality of LaserDisc
LaserDisc
and the availability of numerous titles not available on VHS. LaserDiscs were also popular alternatives to videocassettes among movie enthusiasts in the more affluent regions of South East Asia, such as Singapore, due to their high integration with the Japanese export market and the disc-based media's superior longevity compared to videocassette, especially in the humid conditions endemic to that area of the world. The format also became quite popular in Hong Kong
Hong Kong
during the 1990s before the introduction of VCDs and DVD; although people rarely bought the discs (because each LD was priced around USD100), high rental activity helped the video rental business in the city grow larger than it had ever been previously. Due to integration with the Japanese export market, NTSC
NTSC
LaserDiscs were used in the Hong Kong
Hong Kong
market, in contrast to the PAL
PAL
standard used for broadcast (this anomaly also exists for DVD). This created a market for multi-system TVs and multi-system VCRs which could display or play both PAL
PAL
and NTSC materials in addition to SECAM materials (which were never popular in Hong Kong). Some LD players could convert NTSC
NTSC
signals to PAL
PAL
so that most TVs used in Hong Kong
Hong Kong
could display the LD materials. Despite the relative popularity, manufacturers refused to market recordable LaserDisc
LaserDisc
devices on the consumer market, even though the competing VCR
VCR
devices could record onto cassette, which hurt sales worldwide. The inconvenient disc size, the high cost of both the players and the media and the inability to record onto the discs combined to take a serious toll on sales, and contributed to the format's poor adoption figures. Although the LaserDisc
LaserDisc
format was supplanted by DVD
DVD
by the late 1990s, many LD titles are still highly coveted[28] by movie enthusiasts (for example, Disney's Song of the South
Song of the South
which is unavailable in the US in any format, but was issued in Japan
Japan
on LD). This is largely because there are many films that are still only available on LD and many other LD releases contain supplementary material not available on subsequent DVD
DVD
versions of those films. Until the end of 2001, many titles were released on VHS, LD and DVD
DVD
in Japan. LD players are also sometimes still found in contemporary North American high school and college physics classrooms, to play a disc of the Physics: Cinema Classics series of mid-20th century Encyclopædia Britannica films reproducing classic experiments in the field which are difficult or impossible to replicate in the laboratories in educational settings.[29] These films have now been released on DVD.[30] Further developments and applications[edit] Computer control[edit] In the early 1980s, Philips
Philips
produced a LaserDisc
LaserDisc
player model adapted for a computer interface, dubbed "professional". In 1985, Jasmine Multimedia created LaserDisc
LaserDisc
jukeboxes featuring music videos from Michael Jackson, Duran Duran, and Cyndi Lauper. When connected to a PC this combination could be used to display images or information for educational or archival purposes, for example thousands of scanned medieval manuscripts. This strange device could be considered a very early equivalent of a CD-ROM. In the mid-1980s Lucasfilm
Lucasfilm
pioneered the EditDroid non-linear editing system for film and television based on computer-controlled LaserDisc players. Instead of printing dailies out on film, processed negatives from the day's shoot would be sent to a mastering plant to be assembled from their 10-minute camera elements into 20-minute film segments. These were then mastered onto single-sided blank LaserDiscs, just as a DVD
DVD
would be burnt at home today, allowing for much easier selection and preparation of an edit decision list (EDL). In the days before video assist was available in cinematography, this was the only other way a film crew could see their work. The EDL went to the negative cutter who then cut the camera negative accordingly and assembled the finished film. Only 24 EditDroid systems were ever built, even though the ideas and technology are still in use today. Later EditDroid experiments borrowed from hard-drive technology of having multiple discs on the same spindle and added numerous playback heads and numerous electronics to the basic jukebox design so that any point on each of the discs would be accessible within seconds. This eliminated the need for racks and racks of industrial LaserDisc players since EditDroid discs were only single-sided. In 1986, a SCSI-equipped LaserDisc
LaserDisc
player attached to a BBC Master computer was used for the BBC Domesday Project. The player was referred as an LV-ROM ( LaserVision
LaserVision
Read Only Memory) as the discs contained the driving software as well as the video frames. The discs used the CAV format, and encoded data as a binary signal represented by the analog audio recording. These discs could contain in each CAV frame video/audio or video/binary data, but not both. "Data" frames would appear blank when played as video. It was typical for each disc to start with the disc catalog (a few blank frames) then the video introduction before the rest of the data. Because the format (based on the ADFS hard disc format) used a starting sector for each file, the data layout effectively skipped over any video frames. If all 54,000 frames are used for data storage an LV-ROM disc can contain 324 MB of data per side.[31] The Domesday Project systems also included a genlock, allowing video frames, clips and audio to be mixed with graphics originated from the BBC Master; this was used to great effect for displaying high resolution photographs and maps, which could then be zoomed into. During the 1980s in the United States, Digital Equipment Corporation developed the standalone PC control IVIS (Interactive VideoDisc Information System) for training and education. One of the most influential programs developed at DEC was Decision Point, a management gaming simulation, which won the Nebraska Video
Video
Disc Award for Best of Show in 1985. Apple's HyperCard
HyperCard
scripting language provided Macintosh computer users with a means to design databases of slides, animation, video and sounds from LaserDiscs and then to create interfaces for users to play specific content from the disc through software called LaserStacks.[32] User-created "stacks" were shared and were especially popular in education where teacher-generated stacks were used to access discs ranging from art collections to basic biological processes. Commercially available stacks were also popular with the Voyager company being possibly the most successful distributor.[33] Commodore International's 1992 multimedia presentation system for the Amiga, AmigaVision, included device drivers for controlling a number of LaserDisc
LaserDisc
players through a serial port. Coupled with the Amiga's ability to use a Genlock, this allowed for the LaserDisc
LaserDisc
video to be overlaid with computer graphics and integrated into presentations and multimedia displays, years before such practice was commonplace. Pioneer also made computer-controlled units such as the LD-V2000. It had a back-panel RS-232
RS-232
serial connection through a five-pin DIN connector, and no front-panel controls except Open/Close. (The disc would be played automatically upon insertion.) Under contract from the U.S. military, Matrox
Matrox
produced a combination computer/ LaserDisc
LaserDisc
player for instructional purposes. The computer was a 286, the LaserDisc
LaserDisc
player only capable of reading the analog audio tracks. Together they weighed 43 lb (20 kg) and sturdy handles were provided in case two people were required to lift the unit. The computer controlled the player via a 25-pin serial port at the back of the player and a ribbon cable connected to a proprietary port on the motherboard. Many of these were sold as surplus by the military during the 1990s, often without the controller software. Nevertheless, it is possible to control the unit by removing the ribbon cable and connecting a serial cable directly from the computer's serial port to the port on the LaserDisc
LaserDisc
player. Computer games[edit] The format's instant-access capability made it possible for a new breed of LaserDisc-based video arcade games and several companies saw potential in using LaserDiscs for video games in the 1980s and 1990s, beginning in 1983 with Sega's Astron Belt. American Laser Games
American Laser Games
and Cinematronics
Cinematronics
produced elaborate arcade consoles that used the random-access features to create interactive movies such as Dragon's Lair and Space Ace. Similarly, the Pioneer Laseractive
Pioneer Laseractive
and Halcyon were introduced as home video game consoles that used LaserDisc
LaserDisc
media for their software. MUSE LD[edit] In 1991, several manufacturers announced specifications for what would become known as MUSE LaserDisc, representing a span of almost 15 years until the feats of this HD analog optical disc system would finally be duplicated digitally by HD DVD
DVD
and Blu-ray
Blu-ray
Disc. Encoded using NHK's MUSE "Hi-Vision" analogue TV system, MUSE discs would operate like standard LaserDiscs but would contain high-definition 1,125-line (1,035 visible lines) ( Sony
Sony
HDVS) video with a 5:3 aspect ratio. The MUSE players were also capable of playing standard NTSC
NTSC
format discs and are superior in performance to non-MUSE players even with these NTSC
NTSC
discs. The MUSE-capable players had several noteworthy advantages over standard LaserDisc
LaserDisc
players, including a red laser with a much narrower wavelength than the lasers found in standard players. The red laser was capable of reading through disc defects such as scratches and even mild disc rot that would cause most other players to stop, stutter or drop-out. Crosstalk was not an issue with MUSE discs, and the narrow wavelength of the laser allowed for the virtual elimination of crosstalk with normal discs. To view MUSE encoded discs, it was necessary to have a MUSE decoder in addition to a compatible player. There are televisions with MUSE decoding built-in and set top tuners with decoders that can provide the proper MUSE input. Equipment prices were high, especially for early HDTVs which generally eclipsed US$10,000, and even in Japan
Japan
the market for MUSE was tiny. Players and discs were never officially sold in North America, although several distributors imported MUSE discs along with other import titles. Terminator 2: Judgment Day, Lawrence of Arabia, A League of Their Own, Bugsy, Close Encounters of the Third Kind, Bram Stoker's Dracula and Chaplin were among the theatrical releases available on MUSE LDs. Several documentaries, including one about Formula One
Formula One
at Japan's Suzuka Circuit
Suzuka Circuit
were also released. Picture discs[edit] Picture discs have artistic etching on one side of the disc to make the disc more visually attractive than the standard shiny silver surface. This etching might look like a movie character, logo, or other promotional material. Sometimes that side of the LD would be made with colored plastic, rather than the clear material used for the data side. Picture disc LDs only had video material on one side as the "picture" side could not contain any data. Picture discs are rare in North America. LD-G[edit] Pioneer Electronics—one of the format's largest supporters/investors—was also deeply involved in the karaoke business in Japan, and used LaserDiscs as the storage medium for music and additional content such as graphics. This format was generally called LD-G. While several other karaoke labels manufactured LaserDiscs, there was nothing like the breadth of competition in that industry that exists now, as almost all manufacturers have transitioned to CD+G
CD+G
discs. Anamorphic LaserDiscs[edit] With the release of 16:9 televisions in the early 1990s, Pioneer and Toshiba decided that it was time to take advantage of this aspect ratio. Squeeze LDs were enhanced 16:9-ratio widescreen LaserDiscs. During the video transfer stage, the movie was stored in an anamorphic "squeezed" format. The widescreen movie image was stretched to fill the entire video frame with less or none of the video resolution wasted to create letterbox bars. The advantage was a 33% greater vertical resolution compared to letterboxed widescreen LaserDisc. This same procedure was used for anamorphic DVDs, but unlike all DVD players, very few LD players had the ability to unsqueeze the image for 4:3 sets, If the discs were played on a standard 4:3 television the image would be distorted. However some 4:3 sets (such as the Sony WEGA series) could be set to unsqueeze the image. Since very few people outside of Japan
Japan
owned 16:9 displays, the marketability of these special discs was very limited. There were no anamorphic LaserDisc
LaserDisc
titles available in the US except for promotional purposes. Upon purchase of a Toshiba 16:9 television viewers had the option of selecting a number of Warner Bros.
Warner Bros.
16:9 films. Titles include Unforgiven, Grumpy Old Men, The Fugitive, and Free Willy. The Japanese lineup of titles was different. A series of releases under the banner "Squeeze LD" from Pioneer of mostly Carolco titles included Basic Instinct, Stargate, Terminator 2: Judgment Day, Showgirls, Cutthroat Island, and Cliffhanger. Terminator 2
Terminator 2
was released twice in Squeeze LD, the second release being THX certified and a notable improvement over the first. Recordable formats[edit]

A Pioneer LaserRecorder that can be connected to a computer or a video source

A CRVdisc with a VHS
VHS
tape for size comparison

A Recordable Laser Videodisc
Videodisc
with a DVD-R
DVD-R
for size comparison

Another type of video media, CRVdisc, or "Component Recordable Video Disc" were available for a short time, mostly to professionals. Developed by Sony, CRVdiscs resemble early PC CD-ROM
CD-ROM
caddies with a disc inside resembling a full-sized LD. CRVdiscs were blank, write-once, read-many media that can be recorded once on each side. CRVdiscs were used largely for backup storage in professional and commercial applications.[citation needed] Another form of recordable LaserDisc
LaserDisc
that is completely playback-compatible with the LaserDisc
LaserDisc
format (unlike CRVdisc with its caddy enclosure) is the RLV, or Recordable Laser Videodisc. It was developed and first marketed by the Optical Disc Corporation (ODC, now ODC Nimbus) in 1984. RLV discs, like CRVdisc, are also a WORM technology, and function exactly like a CD-R
CD-R
disc. RLV discs look almost exactly like standard LaserDiscs, and can play in any standard LaserDisc
LaserDisc
player after they have been recorded. The only cosmetic difference between an RLV disc and a regular factory-pressed LaserDiscs is their reflective purple-violet (or blue with some RLV discs) color resulting from the dye embedded in the reflective layer of the disc to make it recordable, as opposed to the silver mirror appearance of regular LDs. The purplish color of RLVs is very similar to DVD-R
DVD-R
and DVD+R discs. RLVs were popular for making short-run quantities of LaserDiscs for specialized applications such as interactive kiosks and flight simulators. Pioneer also produced a rewritable LaserDisc
LaserDisc
system, the VDR-V1000 "LaserRecorder" for which the discs had a claimed erase/record potential of 1,000,000 cycles.[34] These recordable LD systems were never marketed toward the general public, and are so poorly known as to create the misconception that home recording for LaserDiscs was impossible and a "weakness" of the LaserDisc
LaserDisc
format. LaserDisc
LaserDisc
sizes[edit] The most common size of LaserDisc
LaserDisc
was 30 cm (11.8 in), approximately the size of 12 in (30.5 cm) LP vinyl records. These discs allowed for 30/36 minutes per side (CAV NTSC/PAL) or 60/64 minutes per side (CLV NTSC/PAL). The vast majority of programming for the LaserDisc
LaserDisc
format was produced on these discs. A number of 20 cm (7.9 in) LaserDiscs were also published. These smaller "EP"-sized LDs allowed for 20 minutes per side (CLV). They are much rarer than the full-size LDs, especially in North America, and roughly approximate the size of 45rpm (7 in (17.8 cm)) vinyl singles. These discs were often used for music video compilations (e.g. Bon Jovi's "Breakout", Bananarama's "Video Singles" or T'Pau's "View From a Bridge".[citation needed]) There were also 12 cm (4.7 in) (CD size) "single"-style discs produced that were playable on LaserDisc
LaserDisc
players. These were referred to as CD Video
CD Video
(CD-V) discs, and Video
Video
Single Discs (VSD). A CD-V carried up to five minutes of analog LaserDisc-type video content (usually a music video), as well as up to 20 minutes of digital audio CD tracks. The original 1989 release of David Bowie's retrospective Sound
Sound
+ Vision CD box set prominently featured a CD-V video of "Ashes to Ashes", and standalone promo CD-Vs featured the video, plus three audio tracks: "John, I'm Only Dancing", "Changes", and "The Supermen". CD-Vs are not to be confused with Video
Video
CDs (which are all-digital and can only be played on VCD players, DVD
DVD
players, CD-i
CD-i
players, computers, and later-model LaserDisc
LaserDisc
players that can also play DVDs, such as the DVL-9xx series from Pioneer). CD-Vs can only be played back on LaserDisc
LaserDisc
players with CD-V capability. VSDs were the same as CD-Vs, but without the audio CD tracks. CD-Vs were somewhat popular for a brief time worldwide, but soon faded from view. VSDs were popular only in Japan
Japan
and other parts of Asia, and were never fully introduced to the rest of the world. See also[edit]

Blu-ray CED SelectaVision VHD Videodisc

References[edit]

^ LaserDisc
LaserDisc
Players: wave of the future?. Retrieved 24 October 2011 – via YouTube.  ^ "Followers of LaserDisc
LaserDisc
Interest". itimes. Retrieved 28 July 2014.  ^ "I Think I Must Admit that Laserdisc Is Dead". mediageek. Retrieved 2014-12-02.  ^ U.S. Patent 3,430,966 Transparent recording disc, 1969. ^ U.S. Patent 3,530,258 Video
Video
signal transducer, 1970. ^ U.S. Patent 4,893,297 Disc-shaped member, 1990. ^ "1979: The VideoDisc Is Here!". History of Media Technology. CED magic. Retrieved 8 April 2011.  ^ Japanese PCs (1984) (15:54), Computer Chronicles ^ Mast & Kawin 2003, p. 198 ^ " LaserDisc
LaserDisc
Museum". LASERDISC PLANET. Archived from the original on 2015-04-28. Retrieved 2012-11-27.  ^ a b "End of Laser Disc Player Products" (press release). UK: Pioneer. 2009-01-15. Retrieved 2009-04-25.  ^ a b "Pioneer Announces End of Laser Disc Player Products". Japan Corp. 2009-01-14. Retrieved 2009-04-25.  ^ a b "Laser Disc Officially Dead". Home media. 2009-01-14. Retrieved 2009-04-25.  ^ "New and emerging video technologies: A status report". Indiana university. October 29, 1998. Archived from the original on October 15, 2007. Retrieved 2007-10-05.  ^ Flaherty, Julie (April 29, 1999). "Bittersweet Times for Collectors of Laser Disk Movies". The New York Times. Retrieved 2007-10-05.  ^ "Laser disk player production end" (press release). JP: Pioneer. 2009-01-14. Retrieved 2009-03-09.  ^ "LD vs. DVD: A Fundamental Difference". 1999-07-03. Archived from the original on 2008-05-13. Retrieved 2012-12-13. CS1 maint: BOT: original-url status unknown (link) ^ a b "LaserDisc: A vision comes to life". Blam Entertainment Group. October 28, 1999. Retrieved 2011-02-10.  ^ a b " Digital audio
Digital audio
modulation in the PAL
PAL
and NTSC
NTSC
video disc formats". J. Audio Eng. Soc. 32: 883. 1984. Retrieved 2008-02-24.  ^ "Laserdisc Forever Review of Star Wars
Star Wars
Episode 1: The Phantom Menace". May 9, 2000. Retrieved 2007-10-05.  ^ "Instructions for Onkyo ED901 decoder" (PDF).  ^ "DTS Digital Surround LaserDisc". January 24, 2005. Retrieved 2007-07-20.  ^ " LaserDisc
LaserDisc
FAQ". PrecisionLaserdisc.com. Retrieved 2007-07-20.  ^ The LaserDisc
LaserDisc
Turtle (real), YouTube ^ " Video
Video
interchange". Video
Video
history.  ^ "(2.7) How does DVD
DVD
compare to laser disc?". AllforMP3.com. Retrieved 2007-07-20.  ^ Dick, Jeff. "Laserdisc Redux". Retrieved 9 October 2012.  ^ G. Crawford, Mark R. Johnson, Jim Taylor (2001). DVD
DVD
Demystified. McGraw Hill Professional. p. 3-64. ISBN 9780071423984. CS1 maint: Uses authors parameter (link) ^ Littler, Kay Hansen. "Physics: CINEMA CLASSICS". Department of Physics, University of North Texas. Retrieved 2007-07-20.  ^ AAPT. "Physics: CINEMA CLASSICS". AAPT. Retrieved 2008-01-15.  ^ "Auto carto" (PDF). The BBC Domesday project, a nation-wide CIS for $4448 (proceedings). Map context (8).  ^ "LaserStacks". Hargrave's Communications Dictionary. Wiley. Retrieved 9 October 2012.  ^ Martin, Jeff. "Voyager Company CD-ROMs: Production History and Preservation Challenges of Commercial Interactive Media" (PDF). Electronic Arts Intermix (EAI) Resource Guide. Retrieved 2007-07-20.  ^ "Pioneer VDR-V1000". www.laserdiscarchive.co.uk. Retrieved 2017-04-23. 

Further reading[edit]

Jordan Isailovic, Videodisc
Videodisc
and Optical Memory Systems. Vol. 1, Boston: Prentice Hall, 1984. ISBN 978-0-13-942053-5 Lenk, John D. Complete Guide to Laser/VideoDisc Player Troubleshooting and Repair. Englewood Cliffs, N.J.: Prentice-Hall, 1985. ISBN 0-13-160813-4.

External links[edit]

Wikimedia Commons has media related to LaserDisc.

The UK LaserDisc
LaserDisc
Player Archive: includes North American players The LaserDisc
LaserDisc
Database: titles database, profiling, marketplace The 'Total Rewind' VCR
VCR
museum, covering LaserDisc
LaserDisc
and other vintage formats Available spectrum organisation The addition of digital sound, by Kees Schouhamer Immink "World On A Silver Platter: A Brief History of Optical Disc" BLAM entry page for discovision The LaserDisc
LaserDisc
FAQ, (original source) MCA DiscoVision History via the Wayback Machine BLAM Entertainment Group: includes Star Wars
Star Wars
and Star Trek LaserDisc catalogs and lists of Dolby Digital
Dolby Digital
and DTS equipped titles Blog and Database: articles, title information, marketplace RCA SelectaVision VideoDisc FAQ: also contains some DiscoVision history eBay UK guide - Laserdisc Players and Laserdiscs - Formats and Features Guide to and software for the Matrox
Matrox
286/ LaserDisc
LaserDisc
player

v t e

Video
Video
storage formats

Videotape

Analog

Quadruplex (1956) VERA (1958) Ampex 2 inch helical VTR (1961) Sony
Sony
2 inch helical VTR (1961) Type A (1965) CV-2000 (1965) Akai (1967) U-matic
U-matic
(1969) EIAJ-1
EIAJ-1
(1969) Cartrivision (1972) Philips
Philips
VCR
VCR
(1972) V-Cord (1974) VX (1974) Betamax
Betamax
(1975) IVC (1975) Type B (1976) Type C (1976) VHS
VHS
(1976) VK (1977) SVR (1979) Video
Video
2000 (1980) CVC (1980) VHS-C
VHS-C
(1982) M (1982) Betacam
Betacam
(1982) Video8 (1985) MII (1986) S- VHS
VHS
(1987) S- VHS-C
VHS-C
(1987) Hi8 (1989) Ruvi (1998)

Digital

D1 (1986) D2 (1988) D3 (1991) DCT (1992) Digital Betacam
Betacam
(1993) D5 (1994) Digital-S
Digital-S
(D9) (1995) Betacam
Betacam
SX (1996) Digital8
Digital8
(1999) MicroMV
MicroMV
(2001)

High Definition

Sony
Sony
HDVS (1984) UniHi (1984) W- VHS
VHS
(1994) HDCAM
HDCAM
(1997) D- VHS
VHS
(1998) D6 HDTV VTR
D6 HDTV VTR
(2000) HDV
HDV
(2003) HDCAM
HDCAM
SR (2003)

Videodisc

Analog

Phonovision (1927) Ampex-HS (1967) TeD (1975) LaserDisc
LaserDisc
(1978) CED (1981) VHD (1983) Laserfilm
Laserfilm
(1984) CD Video
CD Video
(1987) VSD (c. 1987)

Digital

VCD (1993) MovieCD
MovieCD
(1996) DVD
DVD
(1996) Mini DVD
DVD
(c. 1996) DVD- Video
Video
(1997) CVD (1998) SVCD (1998) EVD (2003) PVD (Personal Video
Video
Disc) (2003) HVD (High-Definition Versatile Disc) (2004) UMD (2004) FVD (2005)

High Definition

MUSE Hi-Vision LD (1994) VMD (2006) HD DVD
DVD
(2006) BRD (BD/ Blu-ray
Blu-ray
disc) (2006) MiniBD (c. 2006) HVD (Holographic Versatile Disc) (2007) CBHD (China Blue High-definition Disc) (2008) UHD BRD (Ultra HD Blu-ray
Blu-ray
disc) (2016)

Virtual

Media agnostic

DV (1995) DVCPRO (1995) DVCAM (1996) DVCPRO50 (1997) DVCPRO HD (2000)

Tapeless

CamCutter Editcam (1995) XDCAM
XDCAM
(2003) MOD (2005) AVCHD
AVCHD
(2006) AVC-Intra (2006) TOD (2007) iFrame (2009) XAVC (2012)

Solid state

P2 (2004) SxS (2007) MicroP2
MicroP2
(2012)

Video
Video
recorded to film

Kinescope
Kinescope
(1947) Telerecording
Telerecording
(1940s) Electronicam
Electronicam
kinescope (1950s) Electronic Video
Video
Recording (1967)

v t e

Optical storage media

Blu-ray
Blu-ray
(2003)

BD-R (2006) BD-RE (2006) BD-R XL (2010) BD-RE XL (2010)

DVD
DVD
(1995)

DVD-R
DVD-R
(1997) DVD-RW
DVD-RW
(1999) DVD+RW
DVD+RW
(2001) DVD+R (2002) DVD+R DL (2004) DVD-R
DVD-R
DL (2005)

Compact disc
Compact disc
(1982)

CD-R
CD-R
(1988) CD-RW
CD-RW
(1997)

Discontinued

Microform
Microform
(1870) Optical tape
Optical tape
(20th century) Optical disc
Optical disc
(20th century) LaserDisc
LaserDisc
(1978) WORM (1979) UDO (2003) ProData (2003) UMD (2004) HD DVD
DVD
(2006)

Magneto-optic Kerr effect
Magneto-optic Kerr effect
(1877)

MO disc (1980s) MiniDisc
MiniDisc
(1992) Hi-MD
Hi-MD
(2004)

Optical Assist

Laser turntable
Laser turntable
(1986) Floptical
Floptical
(1991

.