Information recording and updating method, information recording

Details Information recording and updating method, information recording Information recording and updating method, information recording

1997-11-19

2000-08-08

Kim, W. Chris

Dynamic magnetic information storage or retrieval

Recording on or reproducing from an element of diverse utility

Card

235449, G11B 2504, G06K 708

Patent

active

061010510

ABSTRACT:
When an information signal recorded in a magnetic card is updated by an information recording and updating apparatus, a spectrum spread signal corresponding to the updated information signal is generated and it is then recorded superimposed on to the information recorded previously in the magnetic card without erasing the old information. Since the information is spectrum spread, alteration is difficult. Moreover, the magnetic card may be discriminated whether it may be used or not by considering the old information recorded in the magnetic card when it is used.

REFERENCES:
patent: 5177344 (1993-01-01), Pease
patent: 5719937 (1998-02-01), Warren et al.

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