Pulse or digital communications – Receivers – Particular pulse demodulator or detector
Reexamination Certificate
2006-03-15
2009-12-15
Liu, Shuwang (Department: 2611)
Pulse or digital communications
Receivers
Particular pulse demodulator or detector
C713S176000, C382S100000, C375S262000, C375S265000
Reexamination Certificate
active
07634031
ABSTRACT:
Watermark information (denoted WM) consists of several symbols which are embedded continuously in an audio or a video signal. At decoder site the WM is regained using correlation of the received signal with an m-sequence if Spread Spectrum is used. According to the invention, each WM symbol carries an identification data ID item in addition to its normal payload, and it is already tested in the encoder whether or not the signal is good enough so that the embedded symbol can be recovered at decoder side. If true, it is embedded. If not true, no WM is embedded for the length of one symbol and the test is repeated for the following symbol. The sequence of IDs is known at the encoder which can therefore detect using the ID whether or not a symbol has been skipped.
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EPO Search Report Attached.
Ying-Gen, Hsia et al. “Multiiple-Description Coding for Robust Image Watermarking,” Image Processing, 2004, ICIP '04. 2004 International Conference on, vol. 4, pp. 2163-2166. Oct. 24, 2004. IEEEE, Piscataway, NJ USA. XP010786211.
European Search Report dated Jun. 9, 2006.
Baum Peter Georg
Voessing Walter
Guarino Rahel
Liu Shuwang
Opalach Joseph J.
Schaefer Jerome G.
Shedd Robert D.
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