| 摘要 |
A method determines the three-dimensional position of a playing card at a distance from a gaming table. The method uses modulated signals incorporating different power levels or different frequencies and can be employed as the cards are being dealt or using cards with more than one transponder. The method includes steps of providing each card with at least one transponder that transmits a card identity signal when activated; transmitting an activating signal modulated as to frequency or energy; forming detection zones up to plurality of distances above the gaming table; receiving at a system computer the unique card identity signal; determining a three-dimensional location of the card above the gaming table; recording and displaying the card activity on a computer monitor screen.
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