EP 1080545 A4 20011114 - DIGITAL HIDDEN DATA TRANSPORT (DHDT)
Title (en)
DIGITAL HIDDEN DATA TRANSPORT (DHDT)
Title (de)
DIGITAL VERSTECKTE DATENÜBERTRAGUNG
Title (fr)
TRANSPORT DE DONNEES NUMERIQUES CACHEES
Publication
Application
Priority
- US 9908675 W 19990420
- US 8518698 P 19980512
Abstract (en)
[origin: WO9959258A1] A system for embedding auxiliary digital information (Di) into an existing primary digitally encoded signal (Xn) to form an unobjectionable composite digital signal (Cn). Auxiliary data bits (Di) modulate a pseudo-random (e.g., PN) sequence (125) to provide an auxiliary data sequence (160) that is used to modify the Least Perceptually Significant Bits (LPSBs) (180) of successive multi-bit samples (120) of the primary signal. In a cross-term compensation embodiment (300, 400, 1000), a correlation (V) between the PN sequence and the sample bits is determined, and compared to the auxiliary data bits (Di) to determine whether there is a desired correspondence. The LPSBs in the samples are toggled (360), if necessary, to provide the desired correspondence. The selection of LPSBs to modify accounts for a desired noise level of the auxiliary data (Di) in the primary signal (Xn). LPSBs may be selected to be modified based on a sparse PN sequence (250) to achieve the desired noise level and to conceal the presence of the auxiliary data (Di). The data to be hidden can be any digital data, while the primary signal is any uncompressed or compressed digitally sampled process, including, for example, audio or video data.
IPC 1-7
IPC 8 full level
G10K 15/02 (2006.01); G10L 19/018 (2013.01); G11B 20/00 (2006.01); H04B 1/707 (2011.01)
CPC (source: EP)
G10L 19/018 (2013.01); G11B 20/00086 (2013.01); G11B 20/00891 (2013.01); G11B 20/00913 (2013.01); H04B 1/707 (2013.01); H04J 13/0022 (2013.01)
Citation (search report)
- [Y] EP 0762417 A2 19970312 - SONY CORP [JP]
- [YD] WO 9709797 A1 19970313 - SOLANA TECHNOLOGY DEV CORP [US]
- [Y] WO 9222060 A1 19921210 - PACIFIC MICROSONICS INC [US]
- [X] WO 8908915 A1 19890921 - IMPERIAL COLLEGE [GB]
- [X] WO 9418762 A1 19940818 - GERZON MICHAEL ANTHONY [GB], et al
- [Y] US 4750173 A 19880607 - BLUETHGEN BJOERN [DE]
- [A] EP 0359325 A1 19900321 - KONINKL PHILIPS ELECTRONICS NV [NL]
- [A] US 4546342 A 19851008 - WEAVER CHARLES S [US], et al
- [PY] WO 9837641 A1 19980827 - SOLANA TECHNOLOGY DEV CORP [US]
- [A] PATENT ABSTRACTS OF JAPAN vol. 013, no. 324 (P - 903) 21 July 1989 (1989-07-21)
- See references of WO 9959258A1
Designated contracting state (EPC)
DE FR GB NL
DOCDB simple family (publication)
WO 9959258 A1 19991118; AU 3656999 A 19991129; CA 2331898 A1 19991118; EP 1080545 A1 20010307; EP 1080545 A4 20011114; JP 2002515678 A 20020528; MX PA00011095 A 20020702
DOCDB simple family (application)
US 9908675 W 19990420; AU 3656999 A 19990420; CA 2331898 A 19990420; EP 99918720 A 19990420; JP 2000548966 A 19990420; MX PA00011095 A 19990420