Magnetic coding method

Details Magnetic coding method Magnetic coding method

1978-03-22

1979-12-25

Cook, Daryl W.

Dynamic magnetic information storage or retrieval

Recording or reproducing plural information signals on the...

235493, 360 43, 360 2, G11B 502, G06K 1906, G11B 509, G11B 2504

Patent

active

041808371

ABSTRACT:
The invention relates to a magnetic coding method. It is characterized by e superposing of a first binary message at a given frequency and a binary message at double frequency in space phase. Application to credit cards with a magnetic track.

REFERENCES:
patent: 3571799 (1971-03-01), Coker, Jr. et al.
patent: 3683413 (1972-08-01), Schlaepfer
patent: 3790754 (1974-02-01), Black et al.
patent: 4090662 (1978-05-01), Fayling

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