Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1988-10-31
1990-06-12
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 7802, 360 103, 360 111, H04N 5783, G11B 5596
Patent
active
049337840
ABSTRACT:
Plural magnetic transducing heads are employed to record and reproduce video information that is stored in a segmented format. One head is in contact with the magnetic recording tape while the other head is out of contact with it. The position of the head which is in contact with the tape is controlled by a suitable ramp voltage generated in accordance with the ratio of actual tape speed to normal play speed, to maintain the head generally aligned with a track on the tape. The other head, which is out of contact with the tape, is also positioned in the same fashion. When a repositioning of the heads is required, a determination is made whether the track of information being reproduced by the head in contact with the tape relates to a particular segment of a field, for example the last field. If so, the head which is out of contact with the tape is appropriately repositioned so that it is in the proper location when it comes into contact with the tape to begin scanning the first segment associated with the next field that is being reproduced. Once the other head has come out of contact with the tape at the end of the previous field, it is repositioned to bring it to the location of the head which is now in contact with the tape.
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Recent Progress in Betacam System Technology, by Tsuneo Morita.
New Technique of Special Noiseless Reproduction in Matsushita NV-1000, by Masayuki Matsumoto et al.
Design Considerations for the D-2 NTSC Composite DVTR, by Richard Brush.
Oldershaw Reginald W.
Steele Robert B.
Ampex Corporation
Canney Vincent P.
Gilbert Douglas M.
Robertson David L.
Strnad Elizabeth E.
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