Title:
水中音響通信装置
Document Type and Number:
Japanese Patent JP5724532
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide an underwater acoustic communication device which is capable of performing reliable communication and is low power consumption.SOLUTION: A transmission circuit provided transmits an acoustic signal in which m bits are frequency division multiplexed and that allocates two different carrier frequencies to each bit such that duplication does not occur across m bits. The transmission circuit is provided with: a bit state determination unit for determining the bit state of a bit for each bit; a carrier generation circuit for generating a carrier signal selecting one of two carrier frequencies according to the bit state of a bit for each bit; an addition circuit for adding a carrier signal for each bit generated by the carrier generation circuit over m bits; and a transmitter that comprises 2 m vibrators which have, as a resonance frequency, any of carrier frequencies assigned over m bits and transmits an acoustic signal. Inputs of 2 m vibrators are electrically connected with each other and the vibrators are driven according to output of the addition circuit.
Inventors:
Hirotaka Kumamoto
Application Number:
JP2011075549A
Publication Date:
May 27, 2015
Filing Date:
March 30, 2011
Export Citation:
Assignee:
NEC
International Classes:
H04B11/00; H04L27/00
Domestic Patent References:
| JP4311116A | ||||
| JP2002374579A | ||||
| JP2007228175A |
Attorney, Agent or Firm:
Akio Miyazaki
Masaaki Ogata
Masaaki Ogata