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:
Feb. 24, 2004
Filed:
Sep. 11, 2002
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
This invention relates to an apparatus and method for embedding data in a signal or for updating data that has been embedded. The object of the invention is to provide a data-update apparatus that together with greatly reducing the amount of operation required for adding, detecting and removing data (electronic watermark) in a plurality of signals, makes it rigid copyright protection possible. In order to accomplish this objective, the present invention provides a data-update apparatus comprising: a channel-selection means that selects and outputs part of the channels of the input signal; a detection means that detects the electronic watermark that is embedded in the signal of the channel selected by the channel-selection means; a judgment means, to which the data detected by the detection means is input, and that determines whether or not to update the electronic watermark; an update-signal-generation means, to which an update instruction is input from the judgment means and to which the signal of the channel selected by the channel-selection means is input, and that outputs an update signal for updating the detected data; and a channel-selection-addition means that selects part of the channels of the input signal and adds the update signal to the selected channels.