PURPOSE: To attain data communication at high speed for a short range by using an ultrasonic wave as a communication medium and using a horn having a proper directivity angle.
CONSTITUTION: An ultrasonic wave frequency being a carrier is converted into a binary signal comprising two kinds of ultrasonic wave frequencies according to a transmission data bit outputted from a data processor 1 in a transmitter A, the converted electric signal is converted into an ultrasonic wave by the ultrasonic resonator of a wave transmitter 6A and sent in air with a directivity in a prescribed direction from a horn 8. The ultrasonic wave from a prescribed direction received by a horn 9 in a receiver B is converted into an electric signal by the ultrasonic resonator 10, the received electric signal is identified by a demodulator 12, converted into a prescribed binary signal and inputted to the data processor 14 as the reception data.
SHIMIZU OSAMU
NOMURA TAKESHI
