Patent ID: 7088244

Claim:
A communication system which allows only an intended receiver(s) to receive a communication signal from a transmitter(s) in an environment in which a plurality of receivers are capable of receiving a communication signal transmitted from the transmitter, the communication system comprising: at least one first wireless tag for defining a first apparatus location area, the first wireless tag storing an ID; at least one second wireless tag for defining a second apparatus location area, the second wireless tag storing an ID that is the same as the ID stored in the first wireless tag in the first apparatus location area; a transmitter comprising reading means for outputting a wireless ID read signal to read out the ID of the first or second wireless tag when the transmitter resides in the first or second apparatus location area, respectively, and means for multiplexing the read ID on a communication signal and transmitting the communication signal; and a receiver comprising reading means for outputting a wireless ID read signal to read the ID of the second or first wireless tag when the receiver resides in the second or first apparatus location area, respectively, means for determining whether or not an ID identical to the read ID is multiplexed on a received communication signal, and means for determining that the communication signal is addressed to the receiver when it is determined that the ID identical to the read ID is multiplexed on the transmission signal, wherein a signal from the transmitter residing in one of the first and second apparatus location areas can be received by the receiver residing in the other apparatus location area.