Dynamic magnetic information storage or retrieval – Monitoring or testing the progress of recording
Patent
1985-05-31
1987-10-06
Faber, Alan
Dynamic magnetic information storage or retrieval
Monitoring or testing the progress of recording
360 78, 360 744, 358907, 369 33, 369 41, 369 50, H04N 5781, G11B 2108
Patent
active
046987029
ABSTRACT:
Playback apparatus for a rotary recording medium includes a playback head for sensing signals from a plurality of tracks which are formed on a rotary recording medium in such a manner that the front end of recording operation continues to the last end thereof; a head move unit for movably supporting the playback head; an envelope detect device for detecting an envelope of signals sensed by the playback head; and a control unit for controlling the head move unit to move the playback head to a desired one of the plurality of tracks based on the detected envelope. The control unit, in order to control the head move unit to move the playback head in a first direction, is adapted to count the distance moved by the playback head with reference to a predetermined reference position, and to control the head move unit to move the playback head in a second direction opposite to the first direction when an envelope is not detected successively at track positions associated with a predetermined number of tracks.
REFERENCES:
patent: 4106058 (1978-08-01), Romeas
patent: 4138663 (1979-02-01), Lehureau
patent: 4175270 (1979-11-01), Zenzefilis
patent: 4519057 (1985-05-01), Higashihara
Faber Alan
Fuji Photo Film Co. , Ltd.
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