Dynamic magnetic information storage or retrieval – Recording on or reproducing from an element of diverse utility – Card
Patent
1977-03-07
1978-08-01
Cook, Daryl W.
Dynamic magnetic information storage or retrieval
Recording on or reproducing from an element of diverse utility
Card
235449, 235462, 250569, 360 51, G06K 708, G06K 710, G11B 2504
Patent
active
041046820
ABSTRACT:
An apparatus is described for reducing the number of undetected errors serially read along the length of a magnetic stripe containing binary information. The magnetic stripe is adhesively attached to a plastic card. A serial self-clocking data stream is developed from a manual magnetic stripe encoded card reader. The data stream comprises clock and data signals including a start signal, an end signal and a summation signal. A four-stage down counter counts a predetermined number of clock signals which occur in a predetermined portion of the stripe after the occurrence of the summation signal. State machine control circuitry delays the detection of the data signals occurring after the end signal for a predetermined time to prevent the detection of the summation signal. Control circuitry controls the down counter and provides a finish signal after the down counter has counted off the number of clock signals in the predetermined portion of the stripe. A first AND gate provides an error signal upon the occurrence of a data signal after the summation signal. A status latch is provided to indicate which one, the error signal or the finish signal, occurs first.
REFERENCES:
patent: 3879693 (1975-04-01), Roscoe et al.
patent: 3949313 (1976-04-01), Tamada et al.
patent: 3949394 (1976-04-01), Kennedy
Banka Eugene F.
Lehner Gerald J.
Burroughs Corporation
Cook Daryl W.
Fissell, Jr. Carl
Peterson Kevin R.
Syrowik David R.
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