Patent ID: 8079520

Claim:
A method for reducing RF (Radio Frequency) interference inside a dual-interface card reader, comprising: adjusting RF power by the dual-interface card reader to reach a specified value; determining a type of an IC (integrated circuit) card which is operating currently by the dual-interface card reader; in response to a determination that the IC card is a contact IC card, adjusting the RF power so as to make the RF power to be lower and responding to the contact IC card by the dual-interface card reader and, additionally, when a contactless IC card is operating before the operation of the contact IC card is completed, responding to the contactless IC card simultaneously by the dual-interface card reader, wherein adjusting the RF power by the dual-interface card reader comprises: modifying a value of a register in a RF interface chip of the dual-interface card reader by the dual-interface card reader to change a resistance value in the RF interface chip.