Magnetic recording/reproduction apparatus which simultaneously s

Details Magnetic recording/reproduction apparatus which simultaneously s Magnetic recording/reproduction apparatus which simultaneously s

1994-05-27

2000-07-18

Kim, W. Chris

Dynamic magnetic information storage or retrieval

General recording or reproducing

Signal switching

360 8, G11B 1514, G11B 500

Patent

active

060915617

ABSTRACT:
A magnetic recording/reproduction apparatus of an azimuth system for recording/reproducing a digital signal by helical scanning a magnetic tape has an SP mode and an LP mode having recording/reproducing time period N (N is an even number) times that of SP mode. The apparatus includes a pair of magnetic head units with opposite azimuth, disposed in close proximity on a circumferential face of a rotary head cylinder with difference in level therebetween corresponding to a predetermined track pitch t for scanning simultaneously two continuous tracks at that pitch. The cylinder is rotated at the same rotation speed in both SP and LP modes, while the tape travel speed is reduced to 1/N that of SP mode when LP mode is specified. When LP mode is specified, the data amount of a digital signal to be recorded is compressed to 1/N that in SP mode, which are provided to the magnetic heads 2-channel record data, and the data amount of reproduced 2-channel digital signals of is expanded by N. In SP mode, recording/reproduction is carried out by every 2 continuous tracks by the pair of magnetic heads for every 1 for rotation of the cylinder. In LP mode, recording/reproduction is carried out in a unit of 2 continuous tracks by the pair of magnetic heads for every N rotations of the cylinder.

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Patent Abstracts of Japan, vol. 12, No. 418 (E-678) Nov. 7, 1988 of JP63-155877 (Sony Corp.) Jun. 29, 1988.
Patent Abstracts of Japan, vol. 16, No. 279 (E-1220) Jun. 22, 1992 of JP04-068884 (Hitachi Ltd.) Mar. 4, 1992.
"A Study on Long Time Mode Recording for Home Use Digital VTR", Proceedings of National Conference of Institute of Electronics, Information and Communication Engineers of Japan, 1-382, Spring, 1990.

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