Patent ID: 6917292
Filing Date: 2005-07-12
Classification: G06K

Abstract:
1. A radio-frequency identification system comprising: (a) a plurality of responders each of which has a unique identification number, and makes a response in radio-frequency communication to an inquiry transmitted from a later mentioned interrogator; (b) an interrogator which makes an inquiry to each of said responders, and receives said response from each of said responders; and (c) a host computer which controls communication made between said responders and said interrogator, and binary-searches a number space of said identification number of each of said responders for identifying a responder(s) existing in a communication area in which said responders and said interrogator can make communication with each other, said host computer having a function of acting as a discriminator for generating a control signal in accordance with first to N-th communication areas in each of which said responders and said interrogator can make communication with each other, binary-searching said number space in each of said first to N-th communication areas one by one to identify a responder(s) existing therein, and inactivating the thus identified responder(s), wherein N is a positive integer equal to or greater than two, and said function is accomplished by software.