Title:
DIGITAL-WATERMARK DETECTION DEVICE, METHOD, AND PROGRAM
Document Type and Number:
WIPO Patent Application WO/2015/068310
Kind Code:
A1
Abstract:
A digital-watermark detection device according to an embodiment of the present invention is provided with: a residual-signal extraction unit; a voiced-segment estimation unit; a storage unit; a phase estimation unit; and a watermark determination unit. The residual-signal extraction unit extracts a residual signal from a speech signal. The voiced-segment estimation unit estimates voiced segments on the basis of the speech signal. The storage unit has, stored in advance therein, a plurality of pulse signals modulated in a plurality of different phases. The phase estimation unit extracts a voiced segment for each analysis frame having a predetermined length, and pattern matches the plurality of pulse signals with the residual signal in the analysis frames, to estimate phases of the speech signal. The watermark determination unit determines whether a digital watermark is present in the speech signal on the basis of the sequence of phases estimated by the phase estimation unit.
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Inventors:
TACHIBANA KENTARO (JP)
MORITA MASAHIRO (JP)
MORITA MASAHIRO (JP)
Application Number:
PCT/JP2013/080466
Publication Date:
May 14, 2015
Filing Date:
November 11, 2013
Export Citation:
Assignee:
TOSHIBA KK (JP)
International Classes:
G10L19/018
Foreign References:
| JP2003044067A | 2003-02-14 | |||
| JP2002169579A | 2002-06-14 | |||
| JP2005521908A | 2005-07-21 | |||
| JPH10512110A | 1998-11-17 |
Other References:
KENTARO TACHIBANA ET AL.: "Iso Hencho ni Motozuku HMM Onsei Gosei Muke Denshi Sukashi Hoshiki no Teian", REPORT OF THE 2013 SPRING MEETING, THE ACOUSTICAL SOCIETY OF JAPAN CD-ROM, March 2013 (2013-03-01), pages 135 - 136
Attorney, Agent or Firm:
SAKAI, Hiroaki et al. (JP)
Hiroaki Sakai (JP)
Hiroaki Sakai (JP)
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