Dynamic information storage or retrieval – Information location or remote operator actuated control – Selective addressing of storage medium
Patent
1983-04-28
1986-04-01
McElheny, Jr., Donald
Dynamic information storage or retrieval
Information location or remote operator actuated control
Selective addressing of storage medium
358907, G11B 1700
Patent
active
045802530
ABSTRACT:
A code signal is intermittently recorded on each recording track of a video disc so as to indicate a groove number. The code signal is picked up by a stylus and is detected by a code signal detector. The detected signal is supplied to a time converter and is converted to detected time data. When the code signal cannot be detected, a detection signal from an arm position detector is used to produce detected time data. Meanwhile, assigned time data is produced by a keyboard and a key input processing circuit. Part of the assigned time data is corrected by a correcting circuit so as to decrease the speed of an arm mechanism before a desired track position. The detected time data and the assigned time data are supplied to a comparator from their upper bits through first and second data selectors, respectively, and are compared. The comparator produces a control signal every time a coincidence is detected. The control signal is suppled to a motor drive circuit through lines so as to decrease the speed of an arm motor.
REFERENCES:
patent: 4135086 (1979-01-01), Baba
patent: 4408312 (1983-10-01), Sugiyama et al.
patent: 4413292 (1983-11-01), Sugiyama et al.
patent: 4428074 (1984-01-01), Abe et al.
McElheny Jr. Donald
Tokyo Shibaura Denki Kabushiki Kaisha
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