Video signal recording apparatus and method

H - Electricity – 04 – N

Patent

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Details

H04N 5/91 (2006.01) H04B 1/69 (2006.01) H04N 5/913 (2006.01) H04N 7/08 (2006.01)

Patent

CA 2239948

An additional information produced by an additional information signal producing means is spectrum-spread by a spectrum spreading code generated on the basis of the timing of the synchronous signal of digital video signal and is then added to the digital video signal by means of a signal adding means. The digital video signal to which the spectrum spread additional information signal is added is then written into a recording medium by a signal writing means Thereby, the additional information signal can be added to the video signal under the condition that the reproducing quality of the video signal is never deteriorated and alteration and deletion are impossible and moreover the additional information signal can be detected for use as required from the video signal.

Une information additionnelle produite par un dispositif de production de signaux d'information additionnelle est soumise à un étalement spectral par un code d'étalement spectral produit à l'aide de l'information temporelle contenue dans le signal de synchronisation du signal vidéo numérique et est ajoutée à ce dernier par un dispositif d'addition de signaux. Le signal vidéo numérique auquel le signal d'information additionnelle à spectre étalé est ajouté est ensuite inscrit sur un support d'enregistrement par un dispositif d'enregistrement de signaux. Par la suite, le signal d'information additionnelle peut être ajouté au signal vidéo sous la condition que la qualité de reproduction du signal vidéo ne soit jamais détériorée, que les altérations et les éliminations soient impossibles et, de plus, qu'ils puissent être extraits du signal vidéo en cas de besoin.

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