| 摘要 |
<p>A write and read system is disclosed which uses, to defeat counterfeiting of value-rated magnetic cards, a synchronous recording of a signal on two parallel tracks (a-a min ) separated by a third track (b) on which a coded synchronization mark is simultaneously recorded, and simultaneous half-width reading of the two side tracks (a-a min ) and full-width reading of the center track (b) in order to derive a marked read signal whose shape, strictly dependent on the write procedure, constitutes the card recognition and validation code.</p> |
