Title:
METHOD AND APPARATUS FOR SIGNAL PROCESSING
Document Type and Number:
WIPO Patent Application WO/2000/058928
Kind Code:
A1
Abstract:
For copyright protection, storage means stores a reference indicating an amount of information to determine whether a digital signal containing electronic watermark information is compressed. Extraction means extracts the amount of the electronic watermark information from the digital signal to be protected. Detector means collates the extracted amount with the reference amount to determine whether the signal has been compressed, and it permits the signal to be copied if uncompressed and prohibits it from being copied if compressed.
Inventors:
EZAKI TADASHI (JP)
IGA AKIRA (JP)
SATO HIDEO (JP)
IGA AKIRA (JP)
SATO HIDEO (JP)
Application Number:
PCT/JP2000/002073
Publication Date:
October 05, 2000
Filing Date:
March 31, 2000
Export Citation:
Assignee:
SONY CORP (JP)
EZAKI TADASHI (JP)
IGA AKIRA (JP)
SATO HIDEO (JP)
EZAKI TADASHI (JP)
IGA AKIRA (JP)
SATO HIDEO (JP)
International Classes:
G09C5/00; G10L21/00; H03M7/30; H04L9/32; H04N1/387; (IPC1-7): G09C5/00; G10L21/00; H04N1/387; H03M7/30
Foreign References:
| EP0903942A2 | 1999-03-24 | |||
| JPH10124673A | 1998-05-15 |
Other References:
J. ONISHI, K. MATSUI.: "A Method of Watermarking with Multiresolution Analysis and PN Sequence, Tajuu kaizoudo kaiseki to PN keiretsu wo riyou shita denshi sukashihou", TRANSACTIONS OF THE INSTITUTE OF ELECTRONICS, INFORMATION AND COMMUNICATION ENGINEERS,, vol. J80-D-II, no. 11, 25 November 1997 (1997-11-25), pages 3020 - 3028, XP002946606
Attorney, Agent or Firm:
Tanabe, Shigemoto (Jingumae 1-chome Shibuya-Ku Tokyo, JP)
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