Browse Prior Art Database

Portable Video Tape Recorder

IP.com Disclosure Number: IPCOM000093834D
Original Publication Date: 1966-Mar-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 73K

Publishing Venue

IBM

Related People

Johnson, RB: AUTHOR [+2]

Abstract

A portable video tape recorder system is shown in drawing 1. The system comprises TV camera 10, camera control unit 11, and a slant-track video recorder.

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Portable Video Tape Recorder

A portable video tape recorder system is shown in drawing 1. The system comprises TV camera 10, camera control unit 11, and a slant-track video recorder.

In drawing 3, the recorder comprises sprocketed capstan 12 and rotating head 13. Tape 14 is driven by capstan 12 from reel 15 around head 13 in a skewed fashion, and again along capstan 12 to reel 16. Head 13 scans horizontally in synchronism with capstan 12 which continuously drives the tape around the head. Since tape 14 is skewed, the resultant scan by head 13 is slanted diagonally across the tape as shown in drawing 4. Sprocket holes 17 are arranged to fall between the recorded slant-tracks 18.

Referring again to drawing 1, the frame and scan rates for camera 10 are obtained from unit 11. These scan rates are derived by unit 11 from timing belt 19 driven by head 13. Belt 19 also drives capstan 12, locking the latter and head 13 in synchronism. The remainder of the circuitry in drawings 1 and 2 is similar to that of present video recorders.

When recording an external video signal, it is necessary that the video signal and the tape motion be in phase such that one complete track 18 contains one complete video frame. Therefore, the arrangement of drawing 5 is provided to compare the rotary position 20 of head 13 to the vertical sync pulse of the video signal. The two signals must be in phase for proper registration of the video on tracks 18.

A phase comparison of the signals is effe...