Dynamic magnetic information storage or retrieval – Record editing
Patent
1975-04-04
1976-08-10
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
Record editing
360 60, 360 74, G11B 2700
Patent
active
039745228
ABSTRACT:
A method and apparatus for a video tape recorder to record a new video signal successively to an old video signal prerecorded on a magnetic tape for editing a magnetic recording in such a manner that, when played back, no picture disturbance is produced at the edited transition of the tape. An end part of the tape bearing recorded information is rewound upon completion of recording thereof. Prior to the recording of a new video signal, the rewound part of the tape is played back to pick up control signals therefrom and the phase of the latter is compared with that of vertical synchronizing signals contained in the new video signal. Upon coincidence of these phases with each other, the operational mode of the video tape recorder is switched from playback to recording and actual recording of the new video signal is commenced. When the magnetic tape thus edited is played back, no picture disturbance results at the edited transition of the tape and desirable pictures can be obtained.
REFERENCES:
patent: 3180930 (1965-04-01), Bounsall
patent: 3248030 (1966-04-01), Ganzhorn
patent: 3353007 (1967-11-01), Combs
patent: 3488058 (1970-01-01), Staar
Fukatsu Motonori
Nakano Tatsumi
Akai Electric Company Limited
Canney Vincent P.
Faber Alan
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