H - Electricity – 04 – L
Patent
H - Electricity
04
L
H04L 27/34 (2006.01) H04N 1/32 (2006.01) H04N 7/08 (2006.01)
Patent
CA 2580298
There is disclosed a method of inserting a secondary stream of binary information into a main symbol stream of at least one standard digital modulation. The stream to be transmitted resulting from the insertion of the secondary stream in the main stream is a symbol stream of a modified digital modulation. The stream to be transmitted has the same symbol rate as the main stream. The sequence of symbols of the stream to be transmitted is encoded according, cumulatively, to a first condition over at least two consecutive symbols of the main stream, on the one hand; and to a second condition on a current bit or a plurality of current bits of the secondary stream, on the other hand.
L'invention concerne un procédé d'insertion d'un flux secondaire d'informations binaires dans le flux de symboles principal d'au moins une modulation numérique standard. Le flux à transmettre résultant de l'insertion du flux secondaire dans le flux principal est un flux de symboles d'une modulation numérique modifiée. Le flux à transmettre présente le même débit de symboles que le flux principal. La séquence de symboles du flux à transmettre est codée cumulativement en fonction d'une première condition sur au moins deux symboles consécutifs du flux principal, d'une part ; et en fonction d'une deuxième condition sur un bit courant ou une pluralité de bits courants du flux secondaire, d'autre part.
Latouche Gilles
Rousseau Frederic
Eads Secure Networks
Robic
LandOfFree
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