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Encyclopedia > Holographic Versatile Disc
This article contains information about a scheduled or expected future product.
It may contain preliminary information that does not reflect the final version of the product.
Picture of an HVD by Optware.
Picture of an HVD by Optware.

Holographic Versatile Disc (HVD) is an optical disc technology which would hold up to 3.9 terabytes (TB) of information. It employs a technique known as collinear holography, whereby two lasers, one red and one green, are collimated in a single beam. The green laser reads data encoded as laser interference fringes from a holographic layer near the top of the disc while the red laser is used as the reference beam and to read servo information from a regular CD-style aluminium layer near the bottom. Servo information is used to monitor the position of the read head over the disc, similar to the head, track, and sector information on a conventional hard disk drive. On a CD or DVD this servo information is interspersed amongst the data. Image File history File links Gnome_globe_current_event. ... Image File history File links Hvd_disc. ... Image File history File links Hvd_disc. ... This article is about a measurement term for data storage capacity. ... This article is about the photographic technique. ... For other uses, see Laser (disambiguation). ... For other uses, see Red (disambiguation). ... For other uses, see Green (disambiguation). ... Collimated light is light whose rays are parallel. ... For other uses, see Green (disambiguation). ... This article is about the photographic technique. ... For other uses, see Red (disambiguation). ... Small R/C servo mechanism 1. ... Aluminum redirects here. ... Typical hard drives of the mid-1990s. ... CD redirects here. ... DVD (also known as Digital Versatile Disc or Digital Video Disc) is a popular optical disc storage media format. ...


A dichroic mirror layer between the holographic data and the servo data reflects the green laser while letting the red laser pass through. This prevents interference from refraction of the green laser off the servo data pits and is an advance over past holographic storage media, which either experienced too much interference, or lacked the servo data entirely, making them incompatible with current CD and DVD drive technology.[1] These discs have the capacity to hold up to 3.9 terabytes (TB) of information, which is approximately 5,500 times the capacity of a CD-ROM, 830 times the capacity of a DVD, 160 times the capacity of single-layer Blu-ray Discs, and about 4 times the capacity of standard computer hard drives as of 2007. The HVD also has a transfer rate of 1 Gbit/s (128 MB/s). Optware was expected to release a 200 GB disc in early June 2006, and Maxell in September 2006 with a capacity of 300 GB and transfer rate of 20 MB/s.[2] Since the announcement, there have been no further news or products on market. Halogen light bulb capsule (center) with an integrated dichroic reflector. ... For other uses, see Green (disambiguation). ... For other uses, see Red (disambiguation). ... For other uses, see Green (disambiguation). ... This article is about a measurement term for data storage capacity. ... The CD-ROM (an abbreviation for Compact Disc Read-Only Memory (ROM)) is a non-volatile optical data storage medium using the same physical format as audio compact discs, readable by a computer with a CD-ROM drive. ... A Blu-ray Disc (also called BD) is a high-density optical disc format for the storage of digital information, including high-definition video. ... 2007 is a common year starting on Monday of the Gregorian calendar. ... A gigabit is a unit of information or computer storage, abbreviated Gbit or sometimes Gb. ... ReBoot character, see Megabyte (ReBoot). ...

Holographic Versatile Disc structure 1. Green writing/reading laser (532 nm) 2. Red positioning/addressing laser (650 nm) 3. Hologram (data) 4. Polycarbon layer 5. Photopolymeric layer (data-containing layer) 6. Distance layers 7. Dichroic layer (reflecting green light) 8. Aluminium reflective layer (reflecting red light) 9. Transparent base P. PIT
Holographic Versatile Disc structure
1. Green writing/reading laser (532 nm)
2. Red positioning/addressing laser (650 nm)
3. Hologram (data)
4. Polycarbon layer
5. Photopolymeric layer (data-containing layer)
6. Distance layers
7. Dichroic layer (reflecting green light)
8. Aluminium reflective layer (reflecting red light)
9. Transparent base
P. PIT

Contents

Wikipedia does not have an article with this exact name. ... Wikipedia does not have an article with this exact name. ...

Technology

Current optical storage saves one bit per pulse, and the HVD alliance hopes to improve this efficiency with capabilities of around 60,000 bits per pulse in an inverted, truncated cone shape that has a 200 micrometer diameter at the bottom and a 500 micrometer diameter at the top. High densities are possible by moving these closer on the tracks: 100 GB at 18 micrometers separation, 200 GB at 13 micrometers, 500 GB at 8 micrometers and a demonstrated maximum of 3.9 TB for 3 micrometer separation on a 12 cm disc. A micrometre (American spelling: micrometer, symbol µm) is an SI unit of length equal to one millionth of a metre, or about a tenth of the diameter of a droplet of mist or fog. ...


The system uses a green laser, with an output power of 1 watt, a high power for a consumer device laser. So a major challenge of the project for widespread consumer markets is to either improve the sensitivity of the polymer used, or develop and commoditize a laser capable of higher power output and suitable for a consumer unit.[citation needed] For other uses, see Laser (disambiguation). ... For other uses, see Watt (disambiguation). ... A polymer (from Greek: πολυ, polu, many; and μέρος, meros, part) is a substance composed of molecules with large molecular mass composed of repeating structural units, or monomers, connected by covalent chemical bonds. ... Commoditization is a term from both economics and the social sciences which is used to describe the process by which a good becomes saleable in the market. ...


Storage capacity in context

Holographic Versatile Card, a variation of the Holographic Versatile Disc
Holographic Versatile Card, a variation of the Holographic Versatile Disc

It has been estimated that the books in the U.S. Library of Congress, one of the largest libraries in the world, would contain a total of about 20 terabytes if scanned in text format. Not including images from the books, the content could be stored with capacity to spare on six 3.9 TB discs. Image File history File links HVC.svg‎ [edit] Summary Holographic Versatile Card Modelled after a press release photo by Optware. ... Image File history File links HVC.svg‎ [edit] Summary Holographic Versatile Card Modelled after a press release photo by Optware. ... There are very few or no other articles that link to this one. ... Construction of the Thomas Jefferson Building, from July 8, 1888 to May 15, 1894. ...

  • At 15 meter resolution and 32-bit color (about the resolution found in unpopulated areas on Google Earth), a map of the land masses of Earth would occupy just over 2 TB.
  • Using MPEG4 ASP encoding, a 3.9 TB HVD could hold 4,600–11,900 hours of video—just over one year of uninterrupted video at usual encoding rates.[3]
  • Using typical satellite radio encoding (CT-aacPlus at 40 kbit/s), a 3.9 TB HVD could hold over 26.5 years of uninterrupted stereo audio.

Google Earth is a virtual globe program that was originally called Earth Viewer and was created by Keyhole, Inc. ... MPEG-4 Part 2 is a video compression technology developed by MPEG. It belongs to the MPEG-4 ISO/IEC standard (ISO/IEC 14496-2). ... In telecommunications and computing, bitrate (sometimes written bit rate, data rate or as a variable Rbit) is the number of bits that are conveyed or processed per unit of time. ...

Competing technologies

HVD is not the only technology in high-capacity, optical storage media. InPhase Technologies is developing a rival holographic format called Tapestry Media, which they claim will eventually store 1.6 TB with a data transfer rate of 120 MB/s (960 Mbit), and several companies are developing TB-level discs based on 3D optical data storage technology. Such large optical storage capacities compete favorably with both HD DVD and Blu-ray Disc. However, holographic drives are projected to initially cost around US$15,000, and a single disc around US$120–180, although prices are expected to fall steadily.[4] The market for this format is not initially the common consumer, but enterprises with very large storage needs. InPhase Technologies is a technology company developing holographic storage devices and media. ... Info A computer disc about the size of a DVD that can hold 60 times more data will go on sale in 2006, according to its American developer InPhase Technologies, a Lucent spin off. ... Schematic representation of a cross-section through a 3D optical storage disc (yellow) along a data track (orange marks). ... HD-DVD disc HD DVD (for High Density Digital Versatile Disc) is a digital optical media format which is being developed as one standard for high-definition DVD. HD DVD is similar to the competing Blu-ray Disc, which also uses the same CD sized (120 mm diameter) optical data... A Blu-ray Disc (also called BD) is a high-density optical disc format for the storage of digital information, including high-definition video. ...


The HVD FORUM

The HVD FORUM (formerly the HVD Alliance) is a coalition of corporations purposed to provide an industry forum for testing and technical discussion of all aspects of HVD design and manufacturing. By cooperating, members of the Forum hope to expedite development and engender a market receptive to HVD technology.


As of February 2006, the HVD FORUM comprises these corporations: 2006 is a common year starting on Sunday of the Gregorian calendar. ...

Alps Electric Co. ... CMC Magnetics Corporation is one of worlds largest optical disc manufacturers, established in 1978. ... Fujifilm Holdings Corporation or Fujifilm ) is a Japanese company known for its photographic film and cameras. ... Konica Minolta Holdings, Inc. ... LiteOn are a popular manufacturer of DVD and CD writers. ... 1. ...

Standards

On December 9, 2004 at its 88th General Assembly the standards body Ecma International created Technical Committee 44, dedicated to standarizing HVD formats based on Optware's technology. On June 11, 2007, TC44 published the first two HVD standards[5]: ECMA-377[6], defining a 200GB HVD "recordable cartridge" and ECMA-378[7], defining a 100GB HVD-ROM disc. Its next stated goals are 30 GB HVD cards and submission of these standards to the International Organization for Standardization for ISO approval.[8] Ecma International is an international, private (membership-based) standards organization for information and communication systems. ... “ISO” redirects here. ...


References

  1. ^ What's New (2004-08-23). Archived from the original on 2004-10-09.
  2. ^ Maxell focuses on holographic storage. CNET News.com (2005-11-28). Retrieved on 2007-05-28.
  3. ^ Common compression rates for personal storage vary between around 780 and 2000 kbit/s. 3.9 TB equals 2000 kbit/s times 4,650 hours, or 780 kbit/s times 11,930 hours.
  4. ^ Hitachi-Maxell to Ship Holographic Storage this Year. DailyTech (2006-08-03). Retrieved on 2007-05-28.
  5. ^ Ecma releases new Holographic Information Storage Standards. Ecma press release (2007-07-04).
  6. ^ Information Interchange on Holographic Versatile Disc (HVD) Recordable Cartridges – Capacity: 200 Gbytes per Cartridge. ECMA-377.
  7. ^ Information Interchange on Read-Only Memory Holographic Versatile Disc (HVD-ROM) – Capacity: 100 Gbytes per disk. ECMA-378.
  8. ^ Ecma standardizes Holographic Information Storage. Ecma press release (2005-01-26).

Year 2004 (MMIV) was a leap year starting on Thursday of the Gregorian calendar. ... is the 282nd day of the year (283rd in leap years) in the Gregorian calendar. ... Year 2007 (MMVII) is the current year, a common year starting on Monday of the Gregorian calendar and the AD/CE era in the 21st century. ... is the 148th day of the year (149th in leap years) in the Gregorian calendar. ... Year 2007 (MMVII) is the current year, a common year starting on Monday of the Gregorian calendar and the AD/CE era in the 21st century. ... is the 148th day of the year (149th in leap years) in the Gregorian calendar. ...

See also

DVD (also known as Digital Versatile Disc or Digital Video Disc) is a popular optical disc storage media format. ... A Blu-ray Disc (also called BD) is a high-density optical disc format for the storage of digital information, including high-definition video. ... HD-DVD disc HD DVD (for High Density Digital Versatile Disc) is a digital optical media format which is being developed as one standard for high-definition DVD. HD DVD is similar to the competing Blu-ray Disc, which also uses the same CD sized (120 mm diameter) optical data... Ultra Density Optical (UDO) is a next-generation optical disc format designed for high-density storage of high-definition video and data. ... PDD, ProDATA or Professional Disc for DATA is a recordable optical disc format which was introduced by Sony in 2003. ... It has been suggested that Holographic data storage be merged into this article or section. ... Info A computer disc about the size of a DVD that can hold 60 times more data will go on sale in 2006, according to its American developer InPhase Technologies, a Lucent spin off. ... Schematic representation of a cross-section through a 3D optical storage disc (yellow) along a data track (orange marks). ... Protein-Coated Disc (PCD) is a theoretical optical disc technology currently being developed by Professor V. Renugopalakrishnan, formerly of Harvard Medical School and Florida International University. ... Magneto-optical disc. ... There are very few or no other articles that link to this one. ... Look up SVOD in Wiktionary, the free dictionary. ... The Stacked Volumetric Optical Disk (or SVOD) is an optical disk format developed by Hitachi/Maxell, which uses an array of wafer-thin optical disks to allow data storage of around 1TB. Each wafer (a thin polycarbonate disk) holds around 9. ... InPhase Technologies is a technology company developing holographic storage devices and media. ...

External links

v • d • e
Industrial & home video media
Magnetic tape
Analog

VERA (1952) • 2 inch Quadruplex videotape (1956) • 1 inch type A videotape (1965) • 1/4 inch Akai (1967) • U-matic (1969) • Cartrivision (1972) • Video Cassette Recording (aka VCR) (1972) • V-Cord (1974) • VX (aka "The Great Time Machine") (1974) • Betamax (1975) • IVC 2 inch Helical scan (1975) - 1 inch type B videotape (1976) • 1 inch type C videotape (1976) • VHS (1976) • VK (1977) • SVR (1979) • Video 2000 (1980) • CVC (1980) • VHS-C (1982) • M (1982) • Betacam (1982) • Video8 (1985) • MII (1986) • S-VHS (1987) • Hi8 (1989) • S-VHS-C (1987) • W-VHS (1994) is the 277th day of the year (278th in leap years) in the Gregorian calendar. ... Year 2006 (MMVI) was a common year starting on Sunday of the Gregorian calendar. ... is the 58th day of the year in the Gregorian calendar. ... Year 2006 (MMVI) was a common year starting on Sunday of the Gregorian calendar. ... February 28 is the 59th day of the year in the Gregorian calendar. ... Year 2006 (MMVI) was a common year starting on Sunday of the Gregorian calendar. ... The home video business rents and sells videocassettes and DVDs to the public. ... Compact audio cassette Magnetic tape is a non-volatile storage medium consisting of a magnetic coating on a thin plastic strip. ... An analog or analogue signal is any time continuous signal where some time varying feature of the signal is a representation of some other time varying quantity. ... VERA (Vision Electronic Recording Apparatus) was an early videotape format developed by the BBC in the 1950s. ... 2 inch Quadruplex (also called 2″ Quad, or just quad, for short) was the first practical and commercially successful videotape format. ... 1 inch type A (designated Type A by SMPTE) is an open-reel videotape format developed by Ampex in 1965, that was one of the first standardized open-reel videotape formats in the 1 inch (25 mm) width (most others of that size at that time were proprietary). ... 1/4 inch Akai is a portable Helical scan NTSC video VTR. Had 2 video record heads on the scanner. ... Sony U-matic VTR BVU-800 A U-matic tape U-matic is the name of a videocassette format developed by Sony in 1969. ... Cartrivision was a videocassette format introduced in 1972, and the first format of its kind available in the USA.[1] It was produced by Cartridge Television, Inc. ... Video Cassette Recording (VCR) was a video format by Philips, the first successful home videocassette recorder system. ... V-Cord was a videocassette format developed and released by Sanyo in 1974. ... VX was a short-lived and unsucessful videocassette format developed by Quasar in 1974. ... Sonys Betamax is the 12. ... IVC 2 inch Helical scan is a high end analog Helical scan VTR first shown in 1975. ... 1 inch type B (designated Type B by SMPTE) is an open-reel videotape format developed by Bosch in Germany in 1976. ... 1 inch Type C (designated Type C by SMPTE) is a professional open-reel videotape format co-developed and introduced by Ampex and Sony in 1976. ... Bottom view of VHS cassette with magnetic tape exposed Top view of VHS cassette with front casing removed The Video Home System, better known by its abbreviation VHS, is a recording and playing standard. ... Video Cassette Recording (VCR) was a video format by Philips, the first successful home videocassette recorder system. ... Video 2000 (or V2000; also known as Video Compact Cassette, or VCC) was a consumer VCR system and videotape standard developed by Philips and Grundig to compete with JVCs VHS and Sonys Betamax video technologies. ... Compact video cassette or CVC was the one of the first compact video cassette system. ... VHS-C is the compact VHS format used for portable video recorders. ... M is the name of a professional videocassette format developed around 1982 by Matsushita and RCA. It was developed as a competitor to Sonys Betacam format. ... Sony Betacam-SP VTP BVW-65 Betacam and VHS size comparison Betacam SP L (top), Betacam SP S (left), VHS (right) The early form of Betacam tapes are interchangeable with Betamax, though the recordings are not. ... A Video8 cassette The 8mm video format refers informally to three related videocassette formats for the NTSC and PAL/SECAM television systems. ... Note: The MII video tape format is not to be confused with Panasonics M2 videogame console The official logo for the MII videocassette format (courtesy Panasonic) MII is a professional videocassette format developed by Panasonic in 1986 as their answer & competitive product to Sonys Betacam SP format. ... Introduced in Japan in 1987, S-VHS (Super VHS) was an improved version of the VHS standard for consumer video cassette recorders. ... A Video8 cassette The 8mm video format refers informally to three related videocassette formats for the NTSC and PAL/SECAM television systems. ... VHS-C is the compact VHS format used for portable video recorders. ... W-VHS is a high definition analog video tape format created by JVC. The format was originally introduced in 1994 for use with Japans Hi-Vision MUSE broadcasts and is no longer supported; the tapes are no longer manufactured and no players are currently produced for this format. ...

Digital

D1 (1986) • D2 (1988) • D3 (1991) • D5 (1994) • Digital Betacam (1993) • DV (1995) • Digital-S (D9) (1995) • DVCPRO (1995) • DVCAM (1996) • HDCAM (1997) • DVCPRO50 (1998) • D-VHS (1998) • Digital8 (1999) • DVCPRO HD (2000) • D6 HDTV VTR (2000) • MicroMV (2001) • HDV (2003)• HDCAM SR (2003) For other uses, see Digital (disambiguation). ... Sonys D1 format was the first major professional digital video format, introduced in 1987. ... D2 is a professional digital video tape format created by Ampex and other manufacturers through a standards group of the Society of Motion Picture and Television Engineers (SMPTE) and introduced at the 1988 NAB (National Association of Broadcasters) convention as a lower-cost alternative to the D1 format. ... D3 is a professional digital video tape format. ... Panasonic D5 HD VTR AJ-HD3700H A Cassette Tape for D5 HD(Medium) D5 is a professional digital video format introduced by Panasonic in 1994. ... Sony Betacam-SP VTP BVW-65 Betacam and VHS size comparison Betacam SP L (top), Betacam SP S (left), VHS (right) The early form of Betacam tapes are interchangeable with Betamax, though the recordings are not. ... A MiniDV Camcorder For other uses, see DV (disambiguation). ... D-9 or Digital S as it was originally known, is a professional digital videotape format created by JVC in 1995. ... DVCPRO, DVCPRO 50, and DVCPRO HD refer to digital videotape formats using the DV codec, and devised by Panasonic. ... A MiniDV tape For other uses, see DV (disambiguation). ... Betacam and VHS size comparison Betacam SP L, Betacam SP S, VHS Betacam is a family of half-inch professional videotape formats developed by Sony from 1982 onwards. ... A MiniDV tape DV (disambiguation). ... D-VHS logo DVHS redirects here. ... Digital-8 (or D8) is a consumer digital videotape format developed by Sony in the late 1990s. ... A MiniDV tape Digital Video (DV) is a video format launched in 1996, and, in its smaller tape form factor MiniDV, has since become one of the standards for consumer and semiprofessional video production. ... D6 HDTV VTR is SMPTE videotape standard. ... MICROMV camcorder and tape (top) compared to miniDV and Hi8 tapes MicroMV was a videotape format introduced in 2001 by Sony. ... HDV can also mean Hepatitis D virus. ... Betacam and VHS size comparison Betacam SP L, Betacam SP S, VHS Betacam is a family of half-inch professional videotape formats developed by Sony from 1982 onwards. ...

Optical disc
Analog

Laserdisc (1978) • Laserfilm (1984) • CD Video (1986?) “Optical media” redirects here. ... An analog or analogue signal is any time continuous signal where some time varying feature of the signal is a representation of some other time varying quantity. ... Not to be confused with disk laser, a type of solid-state laser in a flat configuration. ... Laserfilm was a videodisc format developed by McDonnell-Douglas in 1984 that was a transmissive laser-based playback medium (unlike its competitor, laserdisc, which was a reflective system). ... CD Video (also known as CDV, CD-V, or CD+V) was a format introduced in the mid-1980s that combined the technologies of compact disc and laserdisc. ...

Digital

VCD (1993) • MovieCD (1995?) • DVD-Video (1995) • MiniDVD • CVD (1998) • SVCD (1998) • FMD (2000) • EVD (2003) • HVD (2004) • FVD (2005) • UMD (2005) • VMD (2006) • HD DVD (2006) • Blu-ray Disc (BD) (2006) • DMD (2006?) • AVCHD (2006) • Tapestry Media (2007) • Total Hi Def (2008) • HVD (TBA) • PH-DVD (TBA) • SVOD (TBA) • Protein-coated disc (TBA) 3D disc (TBA) For other uses, see Digital (disambiguation). ... VCD redirects here. ... Box, inside and outside, to MovieCD edition of The Rutles - All you need is cash MovieCD was a format for digital video storage and consumer playback during the mid to late-1990s, marketed by SIRIUS Publishing, Inc. ... DVD-Video format logo DVD-Video is a consumer video format used to store digital video on DVD (DVD-ROM) discs, and is currently the dominant form of consumer video formats in the United States, Canada, Europe and Australia. ... There are two types of MiniDVD cDVD, which are 80-mm versions of the 120-mm DVD mini-DVD, which are standard CDs filled with the DVD-video format // cDVD A Mini-DVD-RAM with DVD Round Holder. ... The China Video Disc (CVD), developed in the late 1990s, is a Chinese government-sponsored competitor to the SVCD standard. ... Compact Disc Super Video (SVCD) logo/trademark Super Video CD (Super Video Compact Disc or SVCD) is a format used for storing video on standard compact discs. ... Fluorescent Multilayer Disc (FMD), is an optical disc format developed by Constellation 3D that uses fluorescent, rather than reflective materials to store data. ... The Enhanced Versatile Disc (EVD) is an optical medium-based digital audio/video format, developed to provide a means for playing HDTV content using existing optical media. ... High-Definition Versatile Disc (HVD) is an Asian standard of advanced high-definition technology originally developed in China by AMLogic Inc. ... FVD, or Forward Versatile Disc, is an offshoot of DVD developed in Taiwan jointly by the Advanced Optical Storage Research Alliance (AOSRA) and the Industrial Technology Research Institute (ITRI) as a more inexpensive alternative for high-definition content. ... A UMD The Universal Media Disc (UMD) is an optical disc medium developed by Sony for use on the PlayStation Portable. ... Versatile Multilayer Disc (VMD) is a high-capacity red laser optical disc technology designed by New Medium Enterprises, Inc. ... HD-DVD disc HD DVD (for High Density Digital Versatile Disc) is a digital optical media format which is being developed as one standard for high-definition DVD. HD DVD is similar to the competing Blu-ray Disc, which also uses the same CD sized (120 mm diameter) optical data... A Blu-ray Disc (also called BD) is a high-density optical disc format for the storage of digital information, including high-definition video. ... Digital Multilayer Disk (DMD) is an optical disc format developed by D Data Inc. ... AVCHD (Advanced Video Codec High Definition) is a new high definition recording format introduced by Sony and Panasonic. ... Info A computer disc about the size of a DVD that can hold 60 times more data will go on sale in 2006, according to its American developer InPhase Technologies, a Lucent spin off. ... Total Hi Def Disc, also called a Total HD or THD, is an optical disc that includes both rival high-definition optical disc formats, Blu-ray Disc and HD DVD. [1] It was officially announced January 8, 2007 at Warner Bros / Warner Home Videos press conference held at CES... There are very few or no other articles that link to this one. ... The Stacked Volumetric Optical Disk (or SVOD) is an optical disk format developed by Hitachi/Maxell, which uses an array of wafer-thin optical disks to allow data storage of around 1TB. Each wafer (a thin polycarbonate disk) holds around 9. ... Protein-Coated Disc (PCD) is a theoretical optical disc technology currently being developed by Professor V. Renugopalakrishnan, formerly of Harvard Medical School and Florida International University. ... Schematic representation of a cross-section through a 3D optical storage disc (yellow) along a data track (orange marks). ...

Grooved Videodiscs
Analog

Baird Television Record aka Phonovision (1927) • TeD (1974) • Capacitance Electronic Disc aka CED (1981) • VHD (1983) Videodisc (or video disc) is a general term for a laser- or stylus-readable random-access circular disc that contains both audio and video signals recorded in an analog form. ... An analog or analogue signal is any time continuous signal where some time varying feature of the signal is a representation of some other time varying quantity. ... Phonovision, an experimental process for recording a television signal on phonograph records, was developed in the late 1920s in England by British television pioneer John Logie Baird. ... Phonovision, an experimental process for recording a television signal on phonograph records, was developed in the late 1920s in England by British television pioneer John Logie Baird. ... An Ad for the TeD Initially known as, The Video Disc or the Teldec Television Disc, TeD (Television Electronic Disc) was first announced at a press conference in Berlin on June 24, 1970. ... The Capacitance Electronic Disc (or CED) was a video playback system developed by RCA, in which video and audio could be played back on a TV using a special analog needle and high-density groove system similar to phonograph records. ... The Capacitance Electronic Disc (or CED) was a video playback system developed by RCA, in which video and audio could be played back on a TV using a special analog needle and high-density groove system similar to phonograph records. ... VHD is a videodisc format which was marketed predominantly in Japan by JVC. VHD stands for Video High Density, and there was also an audio-only variant called, not surprisingly, AHD. // Technology VHD discs are 25cm in diameter, though the user never sees them as they are stored in caddies...


  Results from FactBites:
 
Holographic Versatile Disc: Information from Answers.com (1228 words)
The blue-green laser reads data encoded as laser interference fringes from a holographic layer near the top of the disc while the red laser is used as the reference beam and to read servo information from a regular CD-style aluminium layer near the bottom.
These discs have the capacity to hold up to 3.9 terabytes (TB) of information, which is approximately 6,000 times the capacity of a CD-ROM, 830 times the capacity of a DVD, 160 times the capacity of single-layer Blu-ray Discs, and about 8 times the capacity of standard computer hard drives as of 2006.
Optware is expected to release a 200 GB disc in early June of 2006, and Maxell in September 2006 with a capacity of 300 GB and transfer rate of 20 MB/s [3] [4].
Holographic Versatile (527 words)
The blue-green laser reads data encoded as laser interference fringes from a holographic layer near the top of the disc while the red laser is used to read servo information from a regular CD-style aluminum layer near the bottom.
A dichroic mirror layer between the holographic data and the servo data reflects the blue-green laser while letting the red laser pass through.
The HVD Alliance is a coalition of corporations purposed to provide an industry forum for testing and technical discussion of all aspects of HVD design and manufacturing.
  More results at FactBites »


 

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