Video tape recorder carrying out field extraction recording and/

Details Video tape recorder carrying out field extraction recording and/ Video tape recorder carrying out field extraction recording and/

1996-06-28

1997-04-08

Kim, W. C.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Signal switching

360 5, 360 7312, G11B 1514, G11B 500, G11B 1552

Patent

active

056193858

ABSTRACT:
A time lapse VTR carrying out field extraction recording includes a gate for extracting intermittently a supplied video signal at a ratio of one field to every three fields, a switching circuit for designating selectively a tape running speed of either 1/9 or 1/12 the tape running speed of a SP mode in the VHS system, and a servo control circuit for driving a capstan motor to run a magnetic tape at the designated tape running speed. The video signal extracted intermittently by the gate circuit is recorded at an azimuth angle differing from each field by a plurality of video heads on a magnetic head running at the designated tape running speed. As a result, the reproduction compatibility of a magnetic tape having field extraction recorded by a time lapse VTR with an EP mode of a conventional VTR of the VHS system is ensured.

REFERENCES:
patent: 4035843 (1977-07-01), Tanimura
patent: 4496995 (1985-01-01), Colles et al.
patent: 4796104 (1989-01-01), Ito et al.
patent: 5144210 (1992-09-01), Sato
patent: 5170295 (1992-12-01), Miyahara
patent: 5239418 (1993-08-01), Tyler et al.
patent: 5432648 (1995-07-01), Watanabe et al.
Sanyo Technical Review vol., 13 No. 2 Aug., 1981; "Normal, Stop-Action and Slow-Motion VTR Performance in a 4-Head System".

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