Vision Electronic Recording Apparatus
| Media type | Magnetic tape,½-inch open reel |
|---|---|
| Encoding | System A |
| Developedby | BBC |
| Usage | Video production |
Vision Electronic Recording Apparatus(VERA) was an earlyanalog recordingvideotapeformat developed from 1952 by theBBCunder project manager DrPeter Axon.
History
[edit]In order to record high frequencies, a tape must move rapidly with respect to the recording or playback head. The frequencies used by video signals are so high that the tape/head speed is on the order of several meters per second (tens of feet per second), an order of magnitude faster than professional analog audio tape recording. The BBC solved the problem by using 52-centimetre (20 in) reels of magnetic tape that passed static heads at a speed of 5.08 metres per second (16.7 ft/s).
VERA was capable of recording about 15 minutes (e.g. 4,572 meters) of405-lineblack-and-whitevideo per reel, and the picture tended to wobble because of some jitter (uneven speed) of the tape transport. Later video recorders used a time base corrector to remove this jitter and make synchronization with the studio house possible.
In order to cope with 625-linePALorSECAMcolour transmissions VERA would likely have required an even faster, and possibly unfeasible, tape speed.
Development began in 1952, but VERA was not perfected until 1958. It was given a live demonstration on-air onPanoramaon 14 April 1958; Richard Dimbleby, seated by a clock, talked for a couple of minutes about the new method of vision recording with instant playback, and then the tape was wound back and replayed. The picture was slightly watery, but reasonably watchable,[1][original research?]and instant playback was something completely new.
However, by this time it had already been rendered obsolete by theAmpexquadruplexvideo recording system. This used 5-centimetre (2.0 in) wide tapes running at a speed of 38 cm (15 in) per second. The rapid tape-to-head speed of quadruplex videotape was achieved by spinning theheadsrapidly on a drum: the system used, with variations, on all videotape systems ever since, as well asDAT.
The BBC scrapped VERA and quickly adopted the Ampex system. It has been suggested[by whom?]that the BBC only continued to develop VERA as a bargaining tool, so it would be offered some of the first Ampex machines produced in unstated exchange for abandoning further work on a potential rival, but the colossal disadvantages of VERA and its status as a technological dead-end make this seem highly unlikely.[citation needed]
See also
[edit]Notes
[edit]External links
[edit]- BBC: The rise and rise of the video
- Oldboys article including instruction manual and film footage
- Chronomedia article
- youtube.com VERA - Early Video Tape Recorder - Peter Axon interview 1958
- videopreservation.conservation-us.org museum BBC's VERA (Vision Electronic Recording Apparatus)
- birth-of-tv.org VERA 1958: Vision Electronic Recording Apparatus
- Introduction to the video recorder,National Science and Media Museumblog
- youtube.com VERA
- rfwilmut.net BROADCAST VIDEO RECORDING
- The History of Television, 1942 to 2000, By Albert Abramson, Christopher H. Sterling, page 83
- youtube.com, Richard Dimbleby demonstrates the new BBC Vision Electronic Recording Apparatus in an edition of Panorama in April 1958.
- Basic Radio & Television, 2/E, By Sharma, page 447