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Information about D2 (video Format)

For other uses of the name D-2, see the disambiguation page.


D-2 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 D-1 format. Like D-1, D-2 video is uncompressed; however, it saves bandwidth and other costs by sampling a fully-encoded NTSC or PAL composite video signal, and storing it directly to magnetic tape, rather than sampling component video. This is known as digital composite.

Ampex conceived of D-2 as a more practical solution for TV broadcasters since it could be inserted into existing broadcast chains and studio facilities without extensive redesign or modifications. This was because, among other things, in addition to its lower purchase and operating costs this D-2 composite digital tape transport accepted standard RS-170A analog inputs and outputs.

Four audio channels are available for editing as well as an analog cue channel. D-2 was the first digital tape format to offer "read before write" (an Ampex term) also known as "preread" on Sony recorders. Read before write allowed simultaneous playback and recording on the same VTR. For example a title could be super imposed over existing video already on the same video tape by playing the tape through a production switcher, adding the title, and recording the new composite image back onto the same location of the tape. This eliminated the need for an additional recorder and saved considerable time in linear editing. If the digital inputs and outputs are used with a digital composite switcher multigenerational performance is excellent. Hundreds of layers of video are possible without image quality loss. Ampex D-2 tape transports are extremely fast. A high speed search at 60 times playback speed with a recognizable color picture allowed three hours of videotape to be searched through in around three minutes.

D-2 used 19 mm (¾ inch) metal particle tape loaded into three different sized cassettes. PCM-encoded audio and timecode are also recorded on the tape. Although the D-2 tapes are similar in appearance to the D-1 format, they are not interchangeable.

D-2 had a relatively brief heyday. As of 2003, only a handful of broadcasters use the D-2 format, and even then only to access materials recorded when the format was more popular.

Panasonic's competing composite digital format is known as D-3.

Models

  • Sony
  • DVR-10
  • DVR-18
  • DVR-20
  • DVR-28
  • DVC 80 Library Management System - LMS
  • DVC 1000s Library Management System - LMS
  • DCR-10 (sold by BTS)
  • DCR-18 (sold by BTS)
  • DCR-20 (sold by BTS)
  • DCR-28 (sold by BTS)
  • Ampex
  • VPR-200
  • VRP-250
  • VPR-300



Ampex D2 VTR

Sony D2


See also

D2 may be:
  • D2 dopamine receptor
  • Vitamin D2 is Ergocalciferol
  • D2 (D2 Mannesmann) was the former name of Vodafone's German division, which resulted from the acquisition of the German company Mannesmann AG
  • D2

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Theory — boolean logic | digital signal processing | computer architecture
Applications — digital photography | digital audio | digital video
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AMPEX (NASDAQ:  AMPX ) is an American electronics company founded in 1944. The name AMPEX is an acronym, created by its founder, Alexander M. Poniatoff, which stands for Alexander M. Poniatoff Excellence.
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The Society of Motion Picture and Television Engineers or SMPTE, (IPA pronunciation: [sɪmpti] and sometimes [sʌmpti]
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D-1 format was the first major professional digital video format, introduced in 1986 through efforts by SMPTE engineering committees.

D-1 stored uncompressed digitized component video, encoded at using the CCIR 601 raster format, along with PCM audio tracks as well as
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Video compression refers to reducing the quantity of data used to represent video images, and this is almost always coupled with the goal of retaining as much of the original's quality as possible.
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This article has been tagged since October 2007.
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PAL, short for Phase Alternating Line, is a colour encoding system used in broadcast television systems in large parts of the world. Other common analogue television systems are SECAM and NTSC.
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Composite video, also called CVBS (Composite Video Blanking and Sync), is the format of an analog television (picture only) signal before it is combined with a sound signal and modulated onto an RF carrier.
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Magnetic tape is a medium for magnetic recording generally consisting of a thin magnetizable coating on a long and narrow strip of plastic. Nearly all recording tape is of this type, whether used for recording audio or video or for computer data storage.
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Component video is a video signal that has been split into two or more components. In popular use, it refers to a type of analog video information that is transmitted or stored as three separate signals.
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Sony Corporation
ソニー株式会?

Public (TYO: 6758 ; NYSE:  SNE )
Founded May 7 1946 (adopted current name in 1958) by Masaru Ibuka and Akio Morita[1]
Headquarters Minato-ku, Tokyo, Japan[1]
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Videotape is a means of recording images and sound onto magnetic tape as opposed to movie film. In most cases, a helical scan video head rotates against the moving tape to record the data in two dimensions, because video signals have a very high bandwidth, and static heads would
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time code is a sequence of numeric codes generated at regular intervals by a timing system. Time codes are used extensively for synchronization, and for logging material in recorded media.
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D1 or D-1 can mean:
  • D1 (Sony) (An early digital video recording format)
  • D1 class Melbourne tram
  • The German D1 mobile phone network, currently known as T-Mobile
  • D-1 152 mm howitzer - a Soviet World War II artillery system.

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2000 2001 2002 - 2003 - 2004 2005 2006

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Panasonic

Public (NYSE:  MC ,TYO: 6752 )
Founded March, 1918
Headquarters Kadoma, Osaka, Japan

Key people Fumio Ohtsubo, president
Industry Electronics
Products Television products
telephones
computers
digital cameras
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D-3 is an uncompressed composite digital video tape format invented at NHK, and introduced commercially by Panasonic in 1991 to compete with Ampex's D-2. It uses half-inch metal particle tape at 83.88 mm/s (compare to D-2's 19 mm and 131.7 mm/s).
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D-3 is an uncompressed composite digital video tape format invented at NHK, and introduced commercially by Panasonic in 1991 to compete with Ampex's D-2. It uses half-inch metal particle tape at 83.88 mm/s (compare to D-2's 19 mm and 131.7 mm/s).
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D-5 is a professional digital video format introduced by Panasonic in 1994. Like Sony's D-1 (8 bit), it is an uncompressed digital component system (10bit), but uses the same half-inch tapes as Panasonic's digital composite D-3 format.
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