Additional information superimposition device

H - Electricity – 04 – B

Patent

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Details

H04B 1/69 (2006.01) H04N 5/76 (2006.01) H04N 5/91 (2006.01) H04N 5/913 (2006.01)

Patent

CA 2238745

Additional information is superimposed consistently while the disturbance of a picture due to excessive superimposition is suppressed The device superimposes a spectrally spread additional information on a video signal. Inverse spread processing is performed on the video signal, and an SS additional information detection means detects whether additional information is superimposed already on the video signal. Based on the detection result performed by the additional information detection means, superimposition of the spectrally spread signal supplied from the spectrally spread signal generation means on the video signal is controlled. A superimposition control method such as superimposition ON/OFF control, superimposition level control, or spread code string control is performed.

Des informations additionnelles sont superposées de façon cohérente, les perturbations d'une image dues aux superpositions excessives étant supprimées. Le dispositif de l'invention superpose des informations additionnelles à spectre étalé sur un signal vidéo. Une inversion de l'étalement est effectué sur ce signal vidéo et un dispositif de détection d'informations additionnelles à spectre étalé détecte les informations additionnelles superposées au signal vidéo. La superposition sur le signal vidéo du signal à spectre étalé fourni par le dispositif de production de signaux à spectre étalé est contrôlée selon le résultat de l'opération de détection effectuée par le dispositif de détection d'informations additionnelles. Un contrôle de superposition en tout ou rien, un contrôle du niveau de superposition ou un contrôle de la chaîne de codage d'étalement est effectué.

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