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Title:
MODULATION DEVICE, MODULATION METHOD, DEMODULATION DEVICE, AND DEMODULATION METHOD
Document Type and Number:
WIPO Patent Application WO/2007/043376
Kind Code:
A1
Abstract:
A modulation device includes: a modulation unit (51) for modulating a carrier (42) of an audible band by an encoded transmission signal (3) so as to generate a modulated signal; a masker sound generation unit (44) for generating a masker signal which is outputted as a masker sound transmitted together with the modulated signal so as to make it difficult to hear the modulated signal; and an acoustic signal generation unit (52) for inserting the masker signal into the modulated signal so as to generate an acoustic signal.

Inventors:
MATSUOKA HOSEI (JP)
Application Number:
PCT/JP2006/319669
Publication Date:
April 19, 2007
Filing Date:
October 02, 2006
Export Citation:
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Assignee:
NTT DOCOMO INC (JP)
MATSUOKA HOSEI (JP)
International Classes:
H04J1/00; G10L19/018; H04B1/707; H04B1/7073; H04B11/00; H04J11/00
Foreign References:
JPH10290215A1998-10-27
JP2003506918A2003-02-18
JP2002354059A2002-12-06
JP2006121222A2006-05-11
JPH09224005A1997-08-26
JP2001148670A2001-05-29
JPS6322102B21988-05-10
JP3491560B22004-01-26
JPS6384216A1988-04-14
JP2004088662A2004-03-18
JP2001028577A2001-01-30
JP2002009734A2002-01-11
JP2006005390A2006-01-05
Other References:
See also references of EP 1947793A4
Attorney, Agent or Firm:
HASEGAWA, Yoshiki et al. (Ginza First Bldg. 10-6, Ginza 1-chom, Chuo-ku Tokyo 61, JP)
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