The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 19, 2002
Filed:
Aug. 28, 1998
Akira Ogino, Tokyo, JP;
Hisayoshi Moriwaki, Tokyo, JP;
Yuji Kimura, Kanagawa, JP;
Takashi Kohashi, Tokyo, JP;
Nozomu Ikeda, Tokyo, JP;
Sony Corporation, Tokyo, JP;
Abstract
In an SS additional information detecting unit, detection of a correlation between an image signal Si superimposed 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.