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Watermark protection method for MP3 file

A watermarking and file technology, applied in electrical components, speech analysis, instruments, etc., can solve problems such as complex encoding and decoding calculations, and achieve the effect of simple algorithm principle, strong imperceptibility of watermarking, and wide applicability

Inactive Publication Date: 2010-11-24
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiency that the existing watermark embedding method requires complicated codec calculation, and provide a simple and convenient watermark method for protecting MP3 files

Method used

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  • Watermark protection method for MP3 file
  • Watermark protection method for MP3 file
  • Watermark protection method for MP3 file

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Embodiment Construction

[0053] The present invention will be further described below in conjunction with the accompanying drawings.

[0054] figure 1 It is an MP3 frame (frame) structure diagram. An MP3 file is composed of frames, and a frame is the smallest unit of an MP3 file. Depend on figure 1 It can be seen that there may be a 16-bit CRC check code behind the frame header (when the CRC flag is 0), and each frame contains frame side information (side information) that can be used to embed watermarks, then each frame can embed at least 1 bit watermark. When the audio file is a monophonic file, the length of the frame side information is 136 bits, and when it is a two-channel file, the length of the frame side information is 256 bits.

[0055] figure 2 It is a structure diagram of the MP3 frame header (header). It can be seen that the frame header structure of each frame has a private bit (Private bit), a copyright bit (Copy right) and an original bit (Copy / Original).

[0056] image 3It i...

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Abstract

The invention provides a watermark protection method for an MP3 file, belonging to the technical field of multimedia signal processing. The method comprises a watermark embedding process in which watermark data is embedded into each audio frame according to a frame structure model fixed by the MP3 file, wherein the embedding of watermark is realized by directly modifying the compression domain data of the MP3 file. The invention has the advantages that: 1) the algorithm has simple principle and wide applicability; 2) the computational complexity of the algorithm is low, no decoding is needed, and the algorithm can be realized through directly modifying code stream; 3) nearly no distortion of hearing is caused; 4) the file size is not changed when being to the accuracy of bit level, and the imperceptibility of watermark is strong; and 5) the algorithm standard is uniform, the technology is mature, and the versatility is strong.

Description

technical field [0001] The invention belongs to the field of multimedia signal processing, in particular to a watermark method for protecting MP3 files. Background technique [0002] With the wide application of computer and network technology, digital multimedia information is widely used and can be transmitted conveniently and quickly. According to the "23rd Statistical Report on Internet Development in China" released by China Internet Network Information Center (CNNIC), by the end of 2008, the number of Internet users in my country reached 298 million, and the number of mobile Internet users reached 113.7 million. Among them, there are about 250 million users who have the habit of listening, downloading and sharing online music. How to prevent paid music from being illegally disseminated, trace the source of dissemination, and protect the legitimate interests of music publishers and the entire audio industry chain has become a top priority. [0003] Watermarking techno...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/00H04L1/00G10L19/018
Inventor 周东敏刘红梅黄继武
Owner SUN YAT SEN UNIV
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