4 definitions by cheese tips

A Laserdisc (laser Video Disc, Laser Vision Video Disc, Discovision, etc.)manufacturing error in which a foreign object, like dust or dirt, makes its way onto the aluminum core of the disc before the protective layer is put on, rendering certain parts of the disc unplayable. Essentially, the laser does not know where to go when the object blocks the groove. The playback on a disc infected with laser lock depends on being either a Standard Play or Extended Play disc. Laser Lock can usually be skipped over on a Standard play disc, but an Extended Play disc is not as easy to skip and you might not be able to play a lot of what's not infected. On a Standard Play disc, the footage will reverse or skip to another area on the disc. The screen of an extended play disc will turn the same grey that is shown when skipping, but it will stay that way until the laser can find its way back to a clear groove. This is most common with the earliest Discs from the MCA Discovision discs made in the late 70's.
Me: "Hey! The screen just turned gray, Harold did you press skip again?"
Harold: "No, I don't even have the remote"
Me: "*sigh*, its probably just laser lock, see if you can get to the next chapter"
by cheese tips March 22, 2017
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Digital Audio Tape (DAT) was a digital magnetic audio tape format, initially designed for audio. It was introduced by Sony in 1987.

It used 4mm tape in a cassette, roughly half the size of a Compact Cassette. DAT tapes are between 15 and 180 minutes in length, a 120-minute tape being 60 meters in length.

The Recording Industry Association of America (RIAA) unsuccessfully lobbied against the introduction of DAT devices into the US, but a tax was imposed on DAT recorders and blank media from 1992. At the time, it was one of the highest quality audio formats, comparable to Compact Disc.

It was never widely adopted by consumers due to its cost, but saw use in professional recording and as a data storage medium (called Digital Data Storage or DDS).

A small number of albums were commercially released on DAT in the first few years of the format.

In 2005, Sony discontinued its remaining DAT recorders.
Wow, DAT sounds like I'm really there in the studio
by cheese tips March 22, 2017
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Also Known by its full name "Compact Disc Interactive", CD-I was a short-lived video disc format introduced by Philips in 1993 that was designed to be played in CD-I players equipped with an optional Digital Video Cartridge. This expansion unit contained a 32 bit RISC processor and 1 MB of RAM to provide MPEG-1 decoding. It was the first digital video format on the consumer market.

It is best known for the infamous Hotel Mario game, or the Legend of Zelda games. These were the only Nintendo games that were ever licensed under any other company (Philips). It's lesser known use was for films. Only 20 or so movies made it onto CD-I.
wow, this CD-I movie looks so clear... for the 90's anyway.
by cheese tips March 22, 2017
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The magic lantern was an early type of image projector, developed in the 17th century.

It used a concave mirror behind a light source to direct as much of the light as possible through a small rectangular sheet of glass – the magic lantern slide – on which was the painted or photographic image to be projected – and onward into a lens at the front.

Candles or oil lamps were used, producing dim projections. Lighting Improvements took the form of the "Argand lamp" from the 1790s, limelight in the 1820s, electric arc light in the 1860s and finally the incandescent electric lamp.

The magic lantern could project moving images by the use of various types of mechanical slide, which could be over a foot long at times and could contain gears cranks and pulleys. ‘English pattern’ slides were 3.5 by 3.5 inches, ‘French pattern slides’ were 3.25 by 4 inches, and the ‘standard European size’ was 3.25 by 3.25 inches.

The magic lantern played a very important part in Victorian society. Temperance and religious lectures were given. The lantern was also used in education, for demonstration of scientific principles, and to relay news of world events. By this time, images were being transferred to slides by photographic means, and then colored by hand. Lanterns of this time could have up to four projection tubes.

Despite the advent of motion pictures, magic lanterns were still used in schools and institutes; photographic and printed slides were still being manufactured in the 1940s.
My grandma has old magic lantern projection slides from the 1920's
by cheese tips March 22, 2017
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