Method and system for decoding time-varying, two-frequency, coherent-phase data
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United States of America Patent
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Dec 2, 1986
Grant Date -
N/A
app pub date -
Jun 16, 1983
filing date -
Jun 16, 1983
priority date (Note) -
Expired
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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.
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