Videotape is
magnetic tape
Magnetic tape is a medium for magnetic storage made of a thin, magnetizable coating on a long, narrow strip of plastic film. It was developed in Germany in 1928, based on the earlier magnetic wire recording from Denmark. Devices that use magne ...
used for storing
video
Video is an electronic medium for the recording, copying, playback, broadcasting, and display of moving visual media. Video was first developed for mechanical television systems, which were quickly replaced by cathode-ray tube (CRT) syst ...
and usually
sound
In physics, sound is a vibration that propagates as an acoustic wave, through a transmission medium such as a gas, liquid or solid.
In human physiology and psychology, sound is the ''reception'' of such waves and their ''perception'' by the ...
in addition. Information stored can be in the form of either an
analog
Analog or analogue may refer to:
Computing and electronics
* Analog signal, in which information is encoded in a continuous variable
** Analog device, an apparatus that operates on analog signals
*** Analog electronics, circuits which use analog ...
or
digital signal. Videotape is used in both
video tape recorder
A video tape recorder (VTR) is a tape recorder designed to record and playback video and audio material from magnetic tape. The early VTRs were open-reel devices that record on individual reels of 2-inch-wide (5.08 cm) tape. They were u ...
s (VTRs) and, more commonly,
videocassette recorder
A videocassette recorder (VCR) or video recorder is an electromechanical device that records analog audio and analog video from broadcast television or other source on a removable, magnetic tape videocassette
Videotape is magnetic tape ...
s (VCRs) and
camcorder
A camcorder is a self-contained portable electronic device with video and recording as its primary function. It is typically equipped with an articulating screen mounted on the left side, a belt to facilitate holding on the right side, hot-swa ...
s. Videotapes have also been used for storing scientific or medical data, such as the data produced by an
electrocardiogram.
Because video signals have a very high
bandwidth
Bandwidth commonly refers to:
* Bandwidth (signal processing) or ''analog bandwidth'', ''frequency bandwidth'', or ''radio bandwidth'', a measure of the width of a frequency range
* Bandwidth (computing), the rate of data transfer, bit rate or thr ...
, and
stationary heads would require extremely high tape speeds, in most cases, a
helical-scan video head rotates against the moving tape to record the data in two dimensions.
Tape is a
linear
Linearity is the property of a mathematical relationship ('' function'') that can be graphically represented as a straight line. Linearity is closely related to '' proportionality''. Examples in physics include rectilinear motion, the linear ...
method of storing information and thus imposes delays to access a portion of the tape that is not already against the heads. The early 2000s saw the introduction and rise to prominence of high-quality random-access video recording media such as
hard disks
A hard disk drive (HDD), hard disk, hard drive, or fixed disk is an electro-mechanical data storage device that stores and retrieves digital data using magnetic storage with one or more rigid rapidly rotating platters coated with magneti ...
and
flash memory. Since then, videotape has been increasingly relegated to archival and similar uses.
Early formats
The electronics division of entertainer
Bing Crosby
Harry Lillis "Bing" Crosby Jr. (May 3, 1903 – October 14, 1977) was an American singer, musician and actor. The first multimedia star, he was one of the most popular and influential musical artists of the 20th century worldwide. He was a ...
's production company, Bing Crosby Enterprises (BCE), gave the world's first demonstration of a videotape recording in Los Angeles on November 11, 1951. In development by
John T. Mullin
John Thomas Mullin (October 5, 1913 – June 24, 1999) was an American pioneer in the field of magnetic tape sound recording and made significant contributions to many other related fields. From his days at Santa Clara University to his death, ...
and Wayne R. Johnson since 1950, the device gave what were described as "blurred and indistinct" images using a modified
Ampex
Ampex is an American electronics company founded in 1944 by Alexander M. Poniatoff as a spin-off of Dalmo-Victor. The name AMPEX is a portmanteau, created by its founder, which stands for Alexander M. Poniatoff Excellence.AbramsoThe History ...
200 tape recorder and standard quarter-inch (0.635 cm) audio tape moving at per second. A year later, an improved version using one-inch (2.54 cm) magnetic tape was shown to the press, who reportedly expressed amazement at the quality of the images although they had a "persistent grainy quality that looked like a worn motion picture." Overall the picture quality was still considered inferior to the best
kinescope
Kinescope , shortened to kine , also known as telerecording in Britain, is a recording of a television program on motion picture film, directly through a lens focused on the screen of a video monitor. The process was pioneered during the 194 ...
recordings on film. Bing Crosby Enterprises hoped to have a commercial version available in 1954 but none came forth.
The
BBC #REDIRECT BBC #REDIRECT BBC
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...
experimented from 1952 to 1958 with a high-speed linear videotape system called
. VERSA used half-inch metallized (1.27 cm) tape on 20-inch reels traveling at .
laboratories on December 1, 1953. The high-speed longitudinal tape system, called Simplex, in development since 1951, could record and play back only a few minutes of a
. The color system used half-inch (1.27 cm) tape on 10½ inch reels to record five tracks, one each for red, blue, green, synchronization, and audio. The black-and-white system used quarter-inch (0.635 cm) tape also on 10½ inch reels with two tracks, one for video and one for audio. Both systems ran at with per reel yielding an 83-second capacity. RCA-owned
first used it on ''The Jonathan Winters Show'' on October 23, 1956, when a prerecorded song sequence by