Patent ID: 7804829

Claim:
A wireless communication system comprising a data transmitter having an image pickup device and a plurality of data receivers, for performing interactive wireless data communications between the data transmitter and each of the data receivers, wherein the data transmitter comprises: a display for displaying an image of a data receiver photographed by the image pickup device, from among the plurality of data receivers; a data transmission destination recognizer for recognizing, as a transmission destination of transmission data, the data receiver with the image thereof displayed on the display; a directional antenna controller for directing a directional antenna to the data receiver recognized as the transmission destination of the transmission data by the data transmission destination recognizer; a command transmitter for transmitting a communication designation command to the data receiver to which the directional antenna is directed by the directional antenna controller; a device address storage for storing a device address of the data receiver; a non-directional antenna; a transmission destination designation mode setter for setting a transmission destination designation mode in response to an input by a user; and an antenna switch for switching from the non-directional antenna to the directional antenna when the transmission destination designation mode is set by the transmission destination designation mode setter, wherein the antenna switch switches from the directional antenna to the non-directional antenna after the device address storage stores the device address of the data receiver; and the data receiver comprises: a command receiver for receiving the communication designation command transmitted by the data transmitter; and an ACK transmitter for transmitting, to the data transmitter, an ACK packet containing the device address of the data receiver, subsequent to a reception of the communication designation command.