Browse Prior Art Database

Video Frame Reduction Recording Scheme

IP.com Disclosure Number: IPCOM000092535D
Original Publication Date: 1966-Dec-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 54K

Publishing Venue

IBM

Related People

Hatley, ET: AUTHOR [+2]

Abstract

This system reduces the magnetic tape storage requirement of video information. Every other frame is recorded but each recorded frame is replayed.

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Video Frame Reduction Recording Scheme

This system reduces the magnetic tape storage requirement of video information. Every other frame is recorded but each recorded frame is replayed.

Drawing 1 includes two record-replay heads 11 and 12 located 180 degrees part on rotating drum 11 which rotates at 900 revolutions per minute. Head 11 is axially located ahead of head 12 one-half the distance determined by the sum of the tract width and the track separation guard band width.

During recording, only head 11 is used to record frame 1, frame 3, etc. This is accomplished by the 180 degrees wrap angle of tape 14 and its forward drive velocity. In drawing 2, with the proper velocity, head 11 enters tape 14 at point 15 exactly one frame time after leaving point 16. On continuous replay, head 11 reads frame 1, then head 12 reads frame 3, etc. The playback signal is thus derived alternately from heads 11 and 12. The audio is recorded on linear tracks
17. For stopped-frame playback, drawing 3 shows another set of 180 degrees opposed, axially in-line heads 20 and 21.

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