H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 17/00 (2006.01) G11B 20/00 (2006.01) H04B 1/69 (2006.01) H04B 1/707 (2006.01) H04N 5/913 (2006.01) H04J 13/00 (2006.01)
Patent
CA 2245784
In an SS additional information detecting unit, detection of a correlation between an image signal Si super imposed with a copying preventive control signal which is spectrum-spread and a PN code series is carried out at every vertical section. In the case where a correlation value between the copying preventive control signal which is superimposed on the image signal Si and is spectrum-spread and a PN code for inverse spreading does not exceed a predetermined threshold value, the correlation value calculated at every vertical section is added. The copying preventive control signal which is spectrum-spread and is superimposed on the image signal is detected by changing the threshold value of whether the correlation between the copying preventive control signal which is superimposed on the image signal Si and is spectrum-spread and the PN code for inverse spreading is established in accordance with a number of vertical sections constituting an object of detecting the correlation. Thereby, the spectrum spread signal can be detected even in the case where the spectrum spread signal is deteriorated.
Dans une unité de détection d'informations additionnelles SS, la détection d'une corrélation entre un signal d'imagerie Si superposé à un signal antiduplication à spectre étalé et une suite de codes PN est effectuée à chaque section verticale. Quand la valeur de corrélation entre le signal antiduplication qui est superposé au signal d'imagerie Si et dont le spectre est étalé, et un code PN d'inversion d'étalement ne dépasse pas un seuil prédéterminé, la valeur de corrélation calculée à chaque section verticale est ajoutée. On détecte le signal antiduplication à spectre étalé qui est superposé au signal d'imagerie en modifiant le seuil auquel la corrélation entre ce signal antiduplication à spectre étalé qui est superposé au signal d'imagerie Si et le code PN d'inversion de l'étalement est établie d'après un certain nombre de sections verticales constituant un objet de détection de corrélation. Le signal à spectre étalé peut par conséquent être détecté même quand il est dégradé.
Ikeda Nozomu
Kimura Yuji
Kohashi Takashi
Moriwaki Hisayoshi
Ogino Akira
Gowling Lafleur Henderson Llp
Sony Corporation
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