公开(公告)号：DE60313370D1

公开(公告)日：2007-05-31

申请号：DE60313370

申请日：2003-02-21

Applicant: ERICSSON TELEFON AB L M

Inventor： FAERBER NIKOLAUS ,  HARTUNG FRANK

IPC: G11B20/00 ,  G10L25/90

Abstract: The invention relates to a method for embedding and detecting a watermark in a digital audio signal. For embedding the watermark in the digital audio signal a modified-segment (S out (t) ) is created from a selected input-segment (s in (t) ) of the digital audio signal. The modified-segment (s out (t) ) is created such, that at least one of two sub-segments ((s sub , 1 (t) (s sub , 2 (t) ) of the input-segment (s in (t) ) is time-shifted (dt) such that in an overlapping zone (L ov ) a correlation value of the two sub-segments (s sub , 1 (t) , (s sub , 2 (t) ) is a maximum. The signal (s ov (t)) in the overlapping zone (L ov ) is then created as a weighted average of the two sub-segments ((s sub , 1 (t) , (s sub , 2 (t) ) in said overlapping zone. For detecting the embedded watermark in a received digital audio signal (x(t)), a first template-signal (h1 (t)) and a second template-signal (h2(t)) are generated. Then a first (c1) and a second (c2) correlation value are created by comparing the first (h1(t)) and second (h2(t)) template-signal with the received digital audio signal (x(t)). Finally, it is assumed that a watermark is included in the received digital audio signal, if the second correlation value (c2) is higher than the first correlation value (c1).

公开(公告)号：AU2003286146A1

公开(公告)日：2005-06-08

申请号：AU2003286146

申请日：2003-10-31

Applicant: ERICSSON TELEFON AB L M

Inventor： HARTUNG FRANK ,  HOLTMANNS SILKE

IPC: G06F21/10 ,  G06F1/00