Record carrier with watermark

Details Record carrier with watermark Record carrier with watermark

G - Physics

11

B

G11B 20/00 (2006.01) G11B 20/14 (2006.01)

Patent

CA 2397242

The invention relates to a record carrier (1) comprising a pattern of substantially parallel tracks (2) for storing data in the form of marks, in which the data is encoded by means of a channel code. The record carrier further includes a watermark (3) which is provided by controlling the parameter of the channel code so as to introduce a predetermined run length distribution in the marks on the record carrier. Brightness differences are caused by introducing this run length distribution. The invention also relates to a device for reading a record carrier, a method of providing a watermark on the record carrier, and a device for providing a watermark on a record carrier.

L'invention concerne un support d'enregistrement (1) comprenant un ensemble de pistes (2) sensiblement parallèles destiné à stocker des données sous forme de marques, les données étant codées grâce à un code de voie, et un filigrane (3) qui est obtenu par la régulation du paramètre du code de voie permettant d'introduire une distribution de longueur de plage prédéterminée dans les marques du support d'enregistrement. L'introduction de cette distribution provoque des contrastes de luminosité. L'invention a également pour objet : un dispositif permettant de lire un support d'enregistrement ; une méthode permettant d'obtenir un filigrane sur ledit support d'enregistrement ; et un dispositif permettant d'obtenir un filigrane sur un support d'enregistrement.

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