(57) A self-tuning coin testing apparatus having a coin sensor circuit which produces
an output signal indicative of a parameter characteristic of the coins which are tested
by the coin sensor and a programmed microprocessor which stores an initial acceptance
limit, determines whether the output signal from the coin sensor is indicative of
a valid coin, stores a signal based on the output signal for each valid coin, calculates
a statistical function based on the stored signal, and finally computes and stores
a new acceptance limit based on the stored signals for a predetermined number of previously
accepted coins. The statistical function, is preferably weighted so that it is based
upon values for only a predetermined number of the most recently accepted coins so
that a recent average is maintained.
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