EP 3001415 A1 20160330 - Method and apparatus for determining whether a specific watermark symbol out of one or more candidate watermark symbols is embedded in a current section of a received audio signal
Title (en)
Method and apparatus for determining whether a specific watermark symbol out of one or more candidate watermark symbols is embedded in a current section of a received audio signal
Title (de)
Verfahren und Vorrichtung zur Bestimmung, ob ein bestimmtes Wasserzeichensymbol aus einem oder mehreren Kandidatenwasserzeichensymbolen in einem gegenwärtigen Abschnitt eines empfangenen Audiosignals eingebettet ist
Title (fr)
Procédé et appareil permettant de déterminer si un symbole en filigrane spécifique à partir d'un ou de plusieurs symboles de filigranes candidats est incorporé dans une section présente d'un signal audio reçu
Publication
Application
Priority
EP 14306464 A 20140923
Abstract (en)
From sets of correlation result values it is determined whether a specific watermark symbol out of one or more candidate watermark symbols is embedded in a received audio signal. For all candidate watermark symbols, from each corresponding set of correlation result values, a group ( n p ) of maximal values together form a peak vector ( v i ). From the normalised peak values (w i ) a probability distribution function (pdf, g (w i )) and a false positive probability function ( P fp (w i )) are calculated. If the values of the false positive probability function are smaller than a first threshold value (T min ), the current candidate watermark symbol is taken as a true watermark symbol. If not yet all candidate watermark symbols have been processed, the next candidate watermark symbol is selected. Otherwise, a minimal value P f p * of the false positive probability functions for all candidate watermark symbols is determined (76) and is compared (77) with a second threshold value (T max ). If it is smaller than the second threshold value, the current candidate watermark symbol is selected. Otherwise, it is determined (78) that no watermark symbol is present.
IPC 8 full level
G10L 19/018 (2013.01)
CPC (source: EP)
G10L 19/018 (2013.01)
Citation (applicant)
- WO 2011141292 A1 20111117 - THOMSON LICENSING [FR], et al
- EP 2014066063 W 20140725
- M. ARNOLD; X.M. CHEN; P. BAUM; U. GRIES; G. DOERR: "A phase-based audio watermarking system robust to acoustic path propagation", IEEE TRANSACTIONS ON INFORMATION FORENSICS AND SECURITY, vol. 9, no. 3, March 2014 (2014-03-01), pages 411 - 425, XP011538857, DOI: doi:10.1109/TIFS.2013.2293952
- H.A. DAVID; H.N. NAGARAJA: "Order statistics", 2003, JOHN WILEY & SONS
- R.E. CAFLISCH: "Monte Carlo and quasi-Monte Carlo methods", ACTA NUMERICA, vol. 7, January 1998 (1998-01-01), pages 1 - 49
Citation (search report)
- [A] EP 2387033 A1 20111116 - THOMSON LICENSING [FR]
- [A] EP 2175443 A1 20100414 - THOMSON LICENSING [FR]
- [A] MICHAEL ARNOLD ET AL: "Robust detection of audio watermarks after acoustic path transmission", PROCEEDINGS OF THE 12TH ACM WORKSHOP ON MULTIMEDIA AND SECURITY, MM&SEC '10, 1 January 2010 (2010-01-01), New York, New York, USA, pages 117, XP055071121, ISBN: 978-1-45-030286-9, DOI: 10.1145/1854229.1854253
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
DOCDB simple family (publication)
DOCDB simple family (application)
EP 14306464 A 20140923; EP 2015070685 W 20150910