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1. (WO2007006623) METHOD AND APPARATUS FOR DETECTING CORRELATION BETWEEN A RECEIVED SIGNAL AND A CANDIDATE SPREADING SEQUENCE
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/2007/006623 International Application No.: PCT/EP2006/063308
Publication Date: 18.01.2007 International Filing Date: 19.06.2006
IPC:
H04B 1/707 (2011.01)
H ELECTRICITY
04
ELECTRIC COMMUNICATION TECHNIQUE
B
TRANSMISSION
1
Details of transmission systems, not covered by a single one of groups H04B3/-H04B13/123; Details of transmission systems not characterised by the medium used for transmission
69
Spread spectrum techniques
707
using direct sequence modulation
Applicants:
DEUTSCHE THOMSON-BRANDT GMBH [DE/DE]; Hermann-Schwer-Str. 3 78048 Villingen-Schwenningen, DE (AllExceptUS)
RISCHER, Daniel [DE/DE]; DE (UsOnly)
BAUM, Peter, Georg [DE/DE]; DE (UsOnly)
Inventors:
RISCHER, Daniel; DE
BAUM, Peter, Georg; DE
Agent:
HARTNACK, Wolfgang; Deutsche Thomson-Brandt GmbH European Patent Operations Karl-Wiechert-Allee 74 30625 Hannover, DE
Priority Data:
05014955.811.07.2005EP
Title (EN) METHOD AND APPARATUS FOR DETECTING CORRELATION BETWEEN A RECEIVED SIGNAL AND A CANDIDATE SPREADING SEQUENCE
(FR) PROCEDE ET APPAREIL PERMETTANT DE DETECTER UNE CORRELATION ENTRE UN SIGNAL RECU ET UNE SEQUENCE D'ETALEMENT CANDIDATE
Abstract:
(EN) Audio watermarking technologies use correlation to retrieve the watermark data. The inventive method for detecting correlation between audio signals includes the steps of calculating the absolute values of the correlated signals, lowpass filtering these absolute values, evaluating the correlation in two different time ranges, namely one where the direct sound is expected and the other where the first echo is expected, calculating the maxima in both ranges, and choosing the correct correlation from several candidate correlations based on these maxima.
(FR) L'invention concerne des technologies de fabrication de filigrane audio mettant en oeuvre la corrélation pour extraire des données de filigrane. Le procédé de cette invention, permettant de détecter une corrélation entre des signaux audio, comprend les étapes consistant à calculer les valeurs absolues des signaux corrélés, à filtrer au moyen d'un filtre passe-bas ces valeurs absolues, à évaluer la corrélation dans deux plages temporelles différentes, plus spécifiquement une dans laquelle le son direct est prévu et l'autre dans laquelle le premier écho est prévu, à calculer les maxima dans les deux plages puis à choisir la corrélation correcte parmi diverses corrélations candidates en fonction de ces maxima.
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Designated States: AE, AG, AL, AM, AT, AU, AZ, BA, BB, BG, BR, BW, BY, BZ, CA, CH, CN, CO, CR, CU, CZ, DE, DK, DM, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, HR, HU, ID, IL, IN, IS, JP, KE, KG, KM, KN, KP, KR, KZ, LA, LC, LK, LR, LS, LT, LU, LV, LY, MA, MD, MG, MK, MN, MW, MX, MZ, NA, NG, NI, NO, NZ, OM, PG, PH, PL, PT, RO, RS, RU, SC, SD, SE, SG, SK, SL, SM, SY, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW
African Regional Intellectual Property Organization (ARIPO) (BW, GH, GM, KE, LS, MW, MZ, NA, SD, SL, SZ, TZ, UG, ZM, ZW)
Eurasian Patent Organization (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM)
European Patent Office (AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HU, IE, IS, IT, LT, LU, LV, MC, NL, PL, PT, RO, SE, SI, SK, TR)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, ML, MR, NE, SN, TD, TG)
Publication Language: English (EN)
Filing Language: English (EN)