Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1983-11-21
1985-10-01
Stellar, George G.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 77, G11B 554, G11B 558
Patent
active
045449694
ABSTRACT:
During a first phase of operation for a disc player incorporating the invention, a derived playback signal which is "above" a signal level of a threshold effects head motion in a given direction. During a second phase of disc player operation, the derived playback signal is again compared with the threshold, only this time a signal that is "below" the threshold effects head motion in the "same" given direction. During a third phase of operation, the derived signal, when at or above the threshold, initiates an incremental drive for the head. Such a drive steps the head in the given direction so long as the lowest playback signal level, during each given disc rotation, continues to increase. Thus, during this third phase of disc player operation, the head settles to a track location which is "invariantly" maximized. This means, therefore, that track eccentricity has absolutely no influence during playback of the track.
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patent: 4371959 (1983-02-01), McGuffin
patent: 4371960 (1983-02-01), Kroiss
Cody Robert F.
Eastman Kodak Company
Stellar George G.
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