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Magnetic Tape Loop Video Converter

IP.com Disclosure Number: IPCOM000093762D
Original Publication Date: 1966-Feb-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 52K

Publishing Venue

IBM

Related People

Hagopian, JJ: AUTHOR

Abstract

In this system, two magnetic tape loops are used to alternately store and playback video information from a 12-inch, 33-1/3 rpm video disk. In the latter, both audio and video signals are recorded in the grooves and picked up by a conventional stylus.

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Magnetic Tape Loop Video Converter

In this system, two magnetic tape loops are used to alternately store and playback video information from a 12-inch, 33-1/3 rpm video disk. In the latter, both audio and video signals are recorded in the grooves and picked up by a conventional stylus.

Magnetic tape loops 10 and 12 are alternately driven by two-position cam 14 and pressure against drive wheel 15 or 17. Loops 10 and 12 are associated with fixed heads 16 and 18 for recording and continuously revolving heads 20 and 22 for sensing, respectively. The video and audio signals comprise six-second bursts, the former at a maximum frequency of 20 kc and the latter having high- frequency transfer pulses 26 superimposed to control switching of the video signal. This is effected by separation circuit 24 and switch 28 between record heads 16 and 18 and coincident switching of the output between sense heads 20 and 22. Thus, a continuous flow of 3.2 mc video is provided to a TV-type display. In addition to the electrical switching, tape loops 10 and 12 are alternately driven for 12'' and stopped every 6 seconds. Thus, while one tape is being recorded, the other is being scanned and is delivering video.

If 120,000 cycles of recording suffices for a single frame and if head resolution is 10,000 cycles per inch, 12 inches of tape length is required per frame. An 1800 rpm revolving head speed, required for a frame rate of 30 per second, causes repetition of a given frame 180 times du...