Global Patent Index - EP 1080545 A1

EP 1080545 A1 2001-03-07 - 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

EP 1080545 A1 (EN)

Application

EP 99918720 A

Priority

  • US 9908675 W
  • US 8518698 P

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 (main, further and additional classification)

H04B 1/69

IPC 8 full level (invention and additional information)

G10K 15/02 (2006.01); G10L 19/018 (2013.01); G11B 20/00 (2006.01); H04B 1/707 (2011.01)

CPC (invention and additional information)

G11B 20/00086 (2013.01); G10L 19/018 (2013.01); G11B 20/00891 (2013.01); G11B 20/00913 (2013.01); H04B 1/707 (2013.01); H04J 13/0022 (2013.01)

Designated contracting state (EPC)

DE FR GB NL

EPO simple patent family

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

INPADOC legal status


2003-08-20 [18D] DEEMED TO BE WITHDRAWN

- Effective date: 20001213

2002-03-27 [RAP1] TRANSFER OF RIGHTS OF AN EP PUBLISHED APPLICATION

- Owner name: VERANCE CORPORATION

2001-11-14 [A4] SUPPLEMENTARY SEARCH REPORT

- Effective date: 20010928

2001-11-14 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A4

- Designated State(s): DE FR GB NL

2001-11-14 [RIC1] CLASSIFICATION (CORRECTION)

- Free text: 7G 11B 20/00 A, 7H 04B 1/707 B

2001-03-07 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20001207

2001-03-07 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): DE FR GB NL