Method and system for decoding time-varying, two-frequency, cohe

Details Method and system for decoding time-varying, two-frequency, cohe Method and system for decoding time-varying, two-frequency, cohe

1983-06-16

1986-12-02

Trafton, David L.

Registers

Coded record sensors

Readout control

235482, 360 2, 369 59, 375110, G06K 700

Patent

active

046266704

ABSTRACT:
A method and system for decoding time-varying, two-frequency, coherent-phase data, such as data from the stripe on a magnetic stripe-bearing medium, includes detecting flux intervals at the beginning of a bit cell of such data; timing with a clock or counter the length of such a bit cell; digitally determining the average length of at least the two bit cells immediately preceding the cell being measured; and digitally determining whether or not another flux reversal lies at or near the midpoint of the bit cell being decoded.

REFERENCES:
patent: 3549804 (1970-12-01), Greenspan et al.
patent: 4053736 (1977-10-01), Banka et al.
patent: 4242755 (1980-12-01), Gauzan
patent: 4264934 (1981-04-01), Mattes
patent: 4357707 (1982-11-01), Delury
"Improved Reader for Magnetically Encoded ID Cards", Computer Design, Jan. 1981, pp. 148-149.
"Magnetic-Stripe-Credit-Card Card-Reader", by Austin Lesea and Rodney Zaks, Microprocessor Interfacing Techniques, Sybex 2d ed 1977, pp. 120-126.
Data Sheets on "Hand Operated, Miniature Magnetic Card Reader-Model 801 (Rev. Jan. 1980).
Data Sheets on "MT-120 Card Reader" by Magtek.
"Specifications of Omron Manual Type Magnetic Card Reader", by Omron Tateisi Electronics Co.
Data Sheets on "Hand Operated Magnetic Stripe Reader" by Nippondenso.
Data Sheets on "Canon MCR-302".
Data Sheets on "Sanac Model MCM-12 Magnetic Card Reader" by Sankyo Seiki Mfg. Co. Ltd.
Data Sheets on "Magstripe Card Readers" by American Magnetics Corp.

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