To simplify structure, and to reduce manufacturing costs since no bidirectional radio communication is required for authenticating both devices for transmitting and receiving radio waves.
A radio transmitter 1 transmits a stream converted by a signal source device 2 by radio using radio waves, and outputs it from an output device 4 connected to a radio receiver 3 at a reception side. The radio transmitter 1 comprises an authetication means 5 for performing authentication with the signal source device 2; a stream conversion means 7 for converting an inputted stream to a data signal; a transmission control means 9 for generating an authentication control signal or a stream transmission permission control signal, and controlling the transmission of data signals; and a radio transmission means 11 for transmitting the signals.
SUGINOSHITA FUMIYASU
Etsuo Tada
Tomomi Furukawa