ELECTRONIC DOCUMENT VALIDATION MACHINE

摘要

The electronic verification machine (242) electronically couples with the circuit and applies an excitation signal such as an AC signal having a predetermined frequency through a read head (230) to the document (100) whereby the document includes a printed conductive material thereon. A sensor array (226A-H) in combination with detection circuit in the electronic verification machine (242) then generates a detection signal in response to the excitation signal which can both represent the location and the characteristics of the electrically printed material on the document. By storing the location of the conductive material on the document in a memory (224), the shape (238) of the conductive material can be determined. The electronic verification machine can also be used to stigmatize the document by applying a signal to the electronic circuits having sufficient strength to alter the electronic circuit.