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Magnetic Tape Editing Arrangement

IP.com Disclosure Number: IPCOM000080682D
Original Publication Date: 1974-Jan-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Guerinet, G: AUTHOR

Abstract

This magnetic tape editing arrangement allows rapid and accurate access to a predetermined segment of information recorded on the tape, regardless of tape speed variations and tape motion direction.

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Magnetic Tape Editing Arrangement

This magnetic tape editing arrangement allows rapid and accurate access to a predetermined segment of information recorded on the tape, regardless of tape speed variations and tape motion direction.

When it is desired to access a given segment of information on a magnetic tape, such as the tape contained in a video or audio cassette, two major problems arise: a) marking of the information segments on the tape, and b) rapid selection of the segment markers to access a predetermined information segment. If magnetic markers are used to identify the various information segments, such markers can be sensed only at a constant speed compatible with the characteristics of the associated circuitry. Thus, where no means are provided within the tape transport to regulate the tape speed, the selection of a given segment cannot be performed at high speed. This is because when the tape is moved at high speed, it is no longer driven by the capstan but, instead, is directly driven by the take-up reel the diameter of which varies, thereby imparting a variable speed to the tape.

The proposd arrangement obviates the disadvantages of such magnetic markers by using optical markers, the detection of which is not affected by the tape speed variations and thus can be performed at high speed, either in the forward or backward tape motion.

The arrangement comprises tapes made of a plastic film substrate, one side of which is coated with ferromagnetic mate...