Watermark embedding and extracting method for protecting digital audio contents copyright and preventing duplication and apparatus using thereof
First Claim
1. (Amended) A method for embedding a digital watermark in the digital audio contents, comprising:
- generating a digital watermark by filtering a predetermined length of pseudo random sequence with audio absolute threshold of hearing in order not to affect the audio characteristics of said digital audio contents; and
embedding said digital watermark in said digital audio contents.
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Accused Products
Abstract
In embedding a watermark in a digital audio contents, a model using a minimum audible limit of the digital audio contents is generated and a series of pseudo random number is masked to generate the watermark to be inserted in the digital audio contents In order to extract the watermark embedded in the digital audio contents, an auditory psychological model having a minimum audible limit, which depends on the characteristic of frequency generated from the digital audio contents, is formed to generate the watermark from a series of pseudo random number. After generating the watermark, the length of the watermark is adjusted according to the relationship of a signal processing between the adjacent digital audio contents. By measuring the correlation between the watermark and digital audio contents, it is possible to detect whether the watermark is inserted or not.
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Citations
29 Claims
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1. (Amended) A method for embedding a digital watermark in the digital audio contents, comprising:
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generating a digital watermark by filtering a predetermined length of pseudo random sequence with audio absolute threshold of hearing in order not to affect the audio characteristics of said digital audio contents; and
embedding said digital watermark in said digital audio contents. - View Dependent Claims (3, 5)
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8. (Amended) A method for extracting a watermark from the digital audio contents, the method including:
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generating a watermark from pseudo random number sequence by forming a psycho-acoustic model having an audio absolute threshold of hearing according to the characteristics of frequency generated from said digital audio contents; and
extracting the embedding of watermark by measuring the correlation between said watermark and said digital audio contents. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
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17. (Amended) A device for embedding watermark in the digital audio contents, the device including:
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means for generating the digital watermark by filtering a predetermined length of pseudo random sequence with audio absolute threshold of hearing in order not to affect the audio characteristics of said digital audio contents; and
means for embedding said digital watermark in said digital audio contents. - View Dependent Claims (18, 20)
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23. (Amended) A device for extracting watermark from the digital audio contents, the device including:
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means for generating a watermark by forming a psycho-acoustic model having an audio absolute threshold of hearing from analyzing the characteristics of frequency generated from said digital audio contents; and
means for extracting the embedding of watermark by measuring the correlation between said watermark and said digital audio contents.
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25. (Amended) The device according to claim 24, wherein said means for adjusting the length of the watermark includes:
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means for restoring back to its original form regarding the signal processed when embedding watermark is performed regarding said adjacent digital audio contents;
means for extracting the information of correlation among said restored adjacent digital audio contents; and
means for resampling said watermark according to said information of correlation. - View Dependent Claims (29)
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Specification