SENDING DEVICE - FIELD SYSTEM INC

Title:

SENDING DEVICE

Document Type and Number:

WIPO Patent Application WO/2011/118018

Kind Code:

A1

Abstract:

Disclosed is a sending device capable of making it difficult for people to perceive sound waves for transmitting information in an environment where information is transmitted in the form of sound waves. Specifically disclosed is a sending device (10) that converts various encoded information into sound waves in an audible frequency band to send the sound waves, which comprises a microphone (16) to which background sound at a site where the sound waves are sent is input as a background sound signal; a peak-frequency detecting unit (107) that detects a peak frequency that mainly constitutes the background sound from the background sound signal; a carrier-wave generating unit (108) that generates carrier waves of a plurality of frequencies having a masking effect on the background sound, the frequencies being natural-number multiples of the peak frequency; and a modulating unit (115) that modulates the plurality of carrier waves using a baseband signal.

Inventors:

TAKARA TOMIO (JP)
SUZUKI HIROSHI (JP)
TSUKUMA TAKASHIGE (JP)
MARUNO YOSHIMARU (JP)
OKUYAMA ICHIRO (JP)

Application Number:

PCT/JP2010/055335

Publication Date:

September 29, 2011

Filing Date:

March 26, 2010

Export Citation:

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Assignee:

FIELD SYSTEM INC (JP)
TAKARA TOMIO (JP)
SUZUKI HIROSHI (JP)
TSUKUMA TAKASHIGE (JP)
MARUNO YOSHIMARU (JP)
OKUYAMA ICHIRO (JP)

International Classes:

H04B11/00; G10L19/018

Domestic Patent References:

WO2007043376A1

2007-04-19

Foreign References:

JP2003186500A	2003-07-04
JP3822224B1	2006-09-13

Other References: