Patent ID: 6175312
Filing Date: 2001-01-16
Classification: G06Q,G07C,G07F

Abstract:
A system comprising an encoder microchip and a decoder microchip, wherein the encoder microchip comprises:a circuit in which a first identification number is stored,a circuit in which a counter value is stored,a first logic circuit to change the value of the counter value only when the encoder microchip is operated, anda non-linear encoding circuit to encode the counter value using the first identification number to generate a transmission value decodable to provide the counter value;wherein the decoder microchip comprises:a circuit in which a second identification number is stored;a circuit in which the transmission value from the encoder microchip is received;a circuit in which the transmission value is decoded using the second identification number to generate from the transmission value a decoded counter value;a circuit in which a second decoded counter value obtained from a transmission value of a previous transmission is stored; anda circuit in which signals are scanned to identify signals conforming to a specific format.