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Title:
UNDERWATER COMMUNICATION METHOD, AND UNDERWATER COMMUNICATION APPARATUS
Document Type and Number:
Japanese Patent JP2010178255
Kind Code:
A
Abstract:

To sufficiently ensure safety of a diver even without using a complicated and expensive communication apparatus.

In a method for performing underwater communication between one master unit 1M and a plurality of slave units (1Sa-1Sc) by using ultrasonic waves, the master unit and slave units are communication apparatuses each having an ultrasonic oscillator 40 and communication sections (41, 42) for performing communication by using ultrasonic signals. The master unit stores identifiers of the respective slave units, and each of the slave units individually stores the identifier. The master unit transmits a signal for distance measurement toward each slave unit (s43), and the slave unit returns, to the master unit, a reception signal including the identifier when the signal for distance measurement is received (s52a-s52c). The master unit acquires relationships of distances to the respective slave units specified based on the time required for communication related to the transmission of the signal for distance measurement and the return of the reception signal from the slave unit, determines priorities of the respective slave units in order from longer distance (s46), and performs communication in order from the slave unit of higher priority (s47a-s47c, s54a-s54c).


Inventors:
IRIE MICHIO
Application Number:
JP2009021232A
Publication Date:
August 12, 2010
Filing Date:
February 02, 2009
Export Citation:
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Assignee:
SEIKO EPSON CORP
International Classes:
H04B11/00; H04R1/44
Domestic Patent References:
JP2008265527A2008-11-06
JP2008531984A2008-08-14
JP2008265527A2008-11-06
JP2008531984A2008-08-14
Attorney, Agent or Firm:
Masahiko Ueyanagi
Osamu Suzawa
Kazuhiko Miyasaka



 
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