Enhanced coin discrimination systems and methods
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Feb 22, 2000
Grant Date -
N/A
app pub date -
Mar 9, 1998
filing date -
Mar 10, 1997
priority date (Note) -
Expired
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Abstract
A parking meter contains both optical detection elements, to detect the presence and the diameter of inserted coins, and conventional coils which are inductively coupled to a passing coin and which load a RF oscillator. The optical detection information is used to control the sampling of the frequency of the oscillators which are loaded by the metal in the falling coins. This provides a synergistic way to combine optical detection with electromagnetic detection to achieve compact recognition templates which readily perform difficult discrimination. Addition of a temperature compensation algorithm makes the resulting system extraordinarily insensitive to temperature-dependent variation in the permeability of a falling coin.
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