Magnetic code reader with adjustable thresholds

G - Physics – 06 – K

Patent

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Details

G06K 7/08 (2006.01) G07D 7/00 (2006.01) G07D 7/04 (2006.01) G07D 7/20 (2006.01)

Patent

CA 2049040

A reader for a coded discontinuous security thread in a security document comprises a multiplicity of reading channels each coupled to at least one magnetic transducing means (11, 40) for sensing along a track across the document and including processing circuits for forming a channel signal which exhibits signal excursions in response to the passage of the ends of each length of magnetic material. First and second comparators (55, 56) compare the channel signal with relatively positive and rela- tively negative thresholds respectively and a bistable switching means (59) is coupled to the comparators to provide a digital sig- nal. A reference comparator (64) controls an analog switch and diode pumps (70, 71) to adjust the thresholds in accordance with the amplitude of a signal excursion.

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