Title:
ULTRASONIC COMMUNICATION DEVICE, ULTRASONIC COMMUNICATION METHOD, AND INFORMATION PROCESSING DEVICE USING SAME
Document Type and Number:
WIPO Patent Application WO/2017/009911
Kind Code:
A1
Abstract:
The purpose of the present invention as to achieve, without the effect of radio waves, directivity with only a specific party, confidentiality of not being able to decode digital data even if intercepted at a position other than that of the specific party, and communication which suppresses noise to the surroundings and does not generate an unnecessary electric field. In order to achieve the purpose, this ultrasonic communication device, which transmits information by ultrasonic waves, is configured so as to have: a plurality of ultrasonic elements for emitting ultrasonic waves to a transmission unit; a modulation unit for modulating carrier waves by transmission information and outputting modulated waves; a time division unit for time-dividing the modulated waves into a plurality thereof; a generation unit for disturbing signals; an addition and subtraction unit for adding and subtracting the disturbing signals to/from the divided modulated waves so as to make an opposite phase relationship; a distance correction unit that obtains distance correction information for correcting position information from the plurality of ultrasonic elements to a microphone on a receiving side device and corrects the phase delay amount and the amplitude of each of the divided modulated waves; and a control unit for controlling the entirety of the transmission unit; and is configured so as to drive the plurality of ultrasonic elements by each of the divided modulated waves, which have been corrected, to emit the ultrasonic waves.
Inventors:
KOBORI TOMOKI (JP)
FUJITA KOUJI (JP)
FUJITA KOUJI (JP)
Application Number:
PCT/JP2015/069964
Publication Date:
January 19, 2017
Filing Date:
July 10, 2015
Export Citation:
Assignee:
HITACHI MAXELL (JP)
International Classes:
H04B13/02; H04B1/38; H04B7/06
Foreign References:
| JP2003258691A | 2003-09-12 | |||
| JP2009152838A | 2009-07-09 |
Other References:
"A Study on Signal Hiding in Secret Communication System Using Multi-Antenna Transmission", IEICE TECHNICAL REPORT. A·P, ANTENNA·DENPA, vol. 109, no. 183, 27 August 2009 (2009-08-27), pages 125 - 130
Attorney, Agent or Firm:
SEIRYO I.P.C. (JP)
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