High speed information retrieval apparatus

Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the record

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Details

360 722, 360 7308, G11B 1546

Patent

active

048901717

ABSTRACT:
A high speed information retrieval apparatus that carries out program retrieval and reproduction on the basis of program numbers used as subcodes corresponding to individual information programs recorded on the magnetic tape. Two high speed search operations are used in moving the tape from a current position to an object position. A memory is used to store code representations of program positions, and a position information calculation circuit determines tape position based on a detection of tape reel rotation. In one high speed search mode, the memory and calculation circuit output are compared to determine position. In another high speed search mode, the subcode on the tape is compared to a current tape position. When the object program number is stored in the memory, the mechanism block is set to a second high speed running mode by a control circuit. The block stays in that mode until the current tape position comes within a threshold distance of the object position. When the object position is not stored in the memory, or the threshold distance is reached in the second mode, the mechanism block is set to a first high speed running mode.

REFERENCES:
patent: 4328520 (1982-05-01), Iwata et al.
patent: 4731679 (1988-03-01), O'Gwynn et al.

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