Money validation
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United States of America Patent
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Feb 10, 1998
Grant Date -
N/A
app pub date -
Feb 12, 1996
filing date -
Mar 11, 1994
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Apparatus for validating items of value is described. The apparatus includes a measurement circuit including an inductor, the complex impedance of which varies in accordance with the interaction between a test item of value and a magnetic field within which the inductor is located. Circuitry is provided for extracting first and second periodic signals from the measurement circuit, and a circuit is provided for timing the interval between corresponding portions of the first and second periodic signals. A processing element then determines the value of a parameter related to at least one of the real and imaginary parts of said complex impedance, as a measure of the validity of said test item, from the outputs of the timing circuit.
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