Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1984-02-01
1987-01-13
Richardson, Robert L.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 102, G11B 2102, G11B 2110
Patent
active
046368825
ABSTRACT:
A video signal reproducing apparatus adapted for reproducing a composite signal formed by superimposing four kinds of pilot signals of different frequencies upon a video signal one after another in a predetermined rotation, one upon each portion of the video signal for a predetermined period, from many recording tracks formed with the composite signal at evenly spaced intervals on a recording medium, comprises: (a) a reproducing head tracing the above recording tracks; (b) reference signal generating apparatus capable of selectively generating in the above predetermined rotation, four kinds of reference signals of different frequencies substantially the same as the frequencies of the four kinds of pilot signals; (c) moving apparatus for moving the recording medium in a direction intersecting the recording track; (d) detecting apparatus for detecting the positional error of the reproducing head relative to the recording track by using a reference signal selected from one of the four kinds of reference signals in conjunction with at least one of the four kinds of pilot signals reproduced via the reproducing head; (e) switch-over apparatus for shifting the operating mode of the apparatus between a first mode in which the reproducing head traces the recording track at intervals of 4n+3 tracks and a second mode in which the head traces the recording track at intervals of 4n+1 tracks (n being an integer); and (f) control apparatus for controlling the detecting apparatus based on the switch-over apparatus.
REFERENCES:
patent: 4414586 (1983-11-01), Hirota et al.
patent: 4416002 (1983-11-01), Oguino et al.
patent: 4497000 (1985-01-01), Terada et al.
patent: 4509083 (1985-04-01), Nakano
patent: 4554596 (1985-11-01), Shibata
Edakubo Hiroo
Takayama Nobutoshi
Takimoto Hiroyuki
Canon Kabushiki Kaisha
Richardson Robert L.
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