ACOUSTIC COMMUNICATION SYSTEM, ACOUSTIC RECEIVER, ACOUSTIC TRANSMITTER, AND ACOUSTIC TRANSMISSION METHOD

Japanese Patent JP2018107742

A

PROBLEM TO BE SOLVED: To achieve acoustic communication which is high in reliability.SOLUTION: The acoustic communication system comprises: an acoustic transmitter for outputting an output acoustic signal (Sout) having a reference signal (RS) having a predetermined bit string and a modulated signal (MS) obtained by modulating a signal to be transmitted; and an acoustic receiver (RX1) for receiving an input acoustic signal (Sind). The acoustic receiver comprises: a reference signal generation part (302) for generating a reference signal (RS); a first correlation arithmetic unit (301) for performing correlation arithmetic operations between the input acoustic signal (Sind) and the reference signal (RS), and for outputting a first arithmetic result (CC1); an arithmetic result storage part (304) for storing a first arithmetic result; a second correlation arithmetic unit (305) for performing correlation arithmetic operations between a stored value (CCD1) stored in the past by the arithmetic result storage part and the first arithmetic result, and for outputting a second arithmetic result (CC2); and Doppler amount arithmetic parts (206, 207) for calculating Doppler amounts in the input acoustic signal (Sind) on the basis of the second arithmetic result.SELECTED DRAWING: Figure 4

AKAMINE YUKINORI
KONDO TETSUYUKI
NANRI MITSUHIKO
OCHI HIROSHI

JP2016254830A

July 05, 2018

December 28, 2016

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HITACHI LTD
JAPAN AGENCY FOR MARINE EARTH SCIENCE & TECH

H04B11/00

JP2004528773A	2004-09-16
JP2014220741A	2014-11-20
JP2010130429A	2010-06-10
JP2003194921A	2003-07-09

Isono International Patent and Trademark Office

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