Method for reproducing data recorded on optical card

Details Method for reproducing data recorded on optical card Method for reproducing data recorded on optical card

1987-08-13

1989-01-10

Sikes, William L.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 44, 369 59, 235454, 250569, G11B 700, G06K 710

Patent

active

047978724

ABSTRACT:
In a method of reproducing data recorded on an optical card in such a manner that distances between successive pits are modulated in accordance with the data, the optical card and an optical reading device are moved relative to each other in a reciprocal manner to derive a read-out signal both in forward and backward movements, the polarity of the read-out signal is selectively inverted in accordance with the mutual relation between the write-in direction and the read-out direction, the read-out signal is converted into a bivalent signal, and a reproduced signal is derived from the bivalent signal in such a manner that front or rear edges of pits viewed in the write-in direction are always detected.

REFERENCES:
patent: 2916624 (1959-12-01), Angel et al.
patent: 3619569 (1971-11-01), Hoehn et al.
patent: 4525822 (1985-06-01), Nishimura
patent: 4558441 (1985-12-01), Yokota et al.
patent: 4599717 (1986-07-01), Bracht et al.
patent: 4650979 (1987-03-01), Stockburger et al.
patent: 4740675 (1988-04-01), Brosnan et al.

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