Adaptive MP3 digital watermark embedding and extracting method

A technology of digital watermarking and extraction methods, applied in voice analysis, instruments, etc.

Inactive Publication Date: 2011-03-30
TSINGHUA UNIV
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AI Technical Summary

Problems solved by technology

The core idea of ​​digital watermarking technology is to directly embed some logo information related or irrelevant to the carrier content into the carrier content, but it does not affect the value of the original work, and cannot be perceived or noticed by the human perception system.
Applying it to the field of MP3 copyright protection is to embed the copyright information set by the content publisher into the MP3 audio stream data, but it will basically not destroy the integrity of the original MP3 audio data. Compared with the original MP3 file, it cannot be ear resolution

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  • Adaptive MP3 digital watermark embedding and extracting method
  • Adaptive MP3 digital watermark embedding and extracting method
  • Adaptive MP3 digital watermark embedding and extracting method

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Embodiment Construction

[0061] The method that the present invention proposes to embed digital watermark in MP3 audio file, its flow process is as follows figure 1 As shown, first read a Sample of the MP3 audio file, decode the Sample, and obtain some granularity groups; select a non-zero subband suitable for embedding watermark information in each granularity group, and embed the watermark information into the corresponding subband For non-zero coefficients, the above process is repeated until the watermark is embedded or all samples of the MP3 audio file are processed, and finally the watermark-embedded MP3 audio file is obtained.

[0062] In the above-mentioned method to the decoding method of Sample, its flow chart is as follows figure 2 As shown, the header information, side information, and scaling factor are respectively decoded, and then Huffman decoding is used to obtain the granularity group.

[0063] In the above method, the method of selecting non-zero subbands suitable for embedding w...

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Abstract

A method for embedding and extracting a self adaptive MP3 digital watermark belongs to the digital watermark technology in the audio processing field, and is characterized in that: the method comprises the following steps in turn: an MP3 audio file is decoded to obtain a granularity group; theoretic and ear masking effects are judged according to ear auditory threshold inside the granularity group; a nonzero subband suitable for embedding watermark information is selected from the granularity group, but three subbands of a low frequency part of a frequency spectrum are excluded; the watermark information isembedded in the selected nonzero subband; recoding of the granularity group after embedding the watermark information is carried out to obtain the MP3 audio file with embedded watermark information. The method has the advantages of strong secretiveness and no influence on the auditory effect of the MP3 audio file.

Description

technical field [0001] The invention belongs to the technical field of audio processing, and also relates to digital watermark technology. Background technique [0002] With the rapid development of information technology and computer Internet technology, multimedia information has become the most important carrier for human beings to obtain information. After digital processing, multimedia information has the advantages of easy encryption, strong anti-interference ability, and reproducibility. In the current Internet environment, video, audio, image, text and other communication methods and interactive content have been greatly developed. Among them, the MP3 technology as the carrier of audio interactive content has become the main body of audio interaction and has been widely used in the Internet. [0003] MP3 technology was born from 1993 to 1994. The full name is MPEG1 Audio Layer3. It was originally designed as the audio part of the MPEGI (the first version of the IS...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L19/00G10L19/018
Inventor 王道顺张靖董琳王思亮岳旭平梁敬弘朱灵
Owner TSINGHUA UNIV
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