Science Fair Projects Ideas - VERA

All Science Fair Projects

      

Science Fair Project Encyclopedia for Schools!

  Search    Browse    Forum  Coach    Links    Editor    Help    Tell-a-Friend    Encyclopedia    Dictionary     

Science Fair Project Encyclopedia

For information on any area of science that interests you,
enter a keyword (eg. scientific method, molecule, cloud, carbohydrate etc.).
Or else, you can start by choosing any of the categories below.

VERA

VERA (Vision Electronic Recording Apparatus) was an early videotape format developed by the BBC in the 1950s.

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 tens of feet per second, as opposed to 15 or 30 inches (38 or 75cm) per second used by professional analog audio tape recording. The BBC solved the problem by using 20.5" (52cm) reels of steel tape that were propelled past the static heads at a speed of 200 inches (almost 17 feet, or 5.08 metres) per second. The machines had to be enclosed in protective cabinets because if the steel bands had snapped in mid-run they could have caused serious injury.

VERA was capable of recording about 15 minutes of 405-line black and white video per reel, and the picture tended to wobble because the synchronizing pulses that keep the picture stable were not recorded accurately enough. Ironically, the only VERA recordings that survive are film telerecordings of the original demonstration.

In order to cope with 625-line PAL or SECAM colour transmissions VERA would have required an even faster, and possibly unfeasible, tape speed.

Development began in 1952, but VERA was not perfected until 1958, by which time it had already been rendered obsolete by the Ampex video recording system. This used conventional 2" (5 cm)-wide tapes running at a speed of 15" (38cm) per second. The rapid tape-to-head speed was achieved by spinning the heads rapidly on a drum - the system used, with variations, on all video tape systems ever since, as well as DAT: see helical scan.

The BBC quietly scrapped VERA and adopted the Ampex system.

External Link:

Picture and background information

10-26-2009 08:16:03
The contents of this article is licensed from www.wikipedia.org under the GNU Free Documentation License. Click here to see the transparent copy and copyright details
Science kits, science lessons, science toys, maths toys, hobby kits, science games and books - these are some of many products that can help give your kid an edge in their science fair projects, and develop a tremendous interest in the study of science. When shopping for a science kit or other supplies, make sure that you carefully review the features and quality of the products. Compare prices by going to several online stores. Read product reviews online or refer to magazines.

Start by looking for your science kit review or science toy review. Compare prices but remember, Price $ is not everything. Quality does matter.
Science Fair Coach
What do science fair judges look out for?
ScienceHound
Science Fair Projects for students of all ages
All Science Fair Projects.com Site
All Science Fair Projects Homepage
Search | Browse | Links | From-our-Editor | Books | Help | Contact | Privacy | Disclaimer | Copyright Notice