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Steady audio-frequency water mark method based on Fourier discrete logarithmic coordinate transformation

An audio watermarking, discrete logarithm technology, applied in speech analysis, complex mathematical operations, instruments, etc., can solve the problems that have not yet been found in the application of Fourier discrete logarithmic transform in audio signal reports.

Inactive Publication Date: 2008-01-09
SUN YAT SEN UNIV
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Problems solved by technology

[0003] According to the search, so far no reports on the application of Fourier discrete logarithmic transform in audio signals have been found.

Method used

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  • Steady audio-frequency water mark method based on Fourier discrete logarithmic coordinate transformation
  • Steady audio-frequency water mark method based on Fourier discrete logarithmic coordinate transformation
  • Steady audio-frequency water mark method based on Fourier discrete logarithmic coordinate transformation

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Embodiment Construction

[0055] Figures 1 and 2 are schematic flow charts of watermark embedding and watermark extraction in the method of the present invention, respectively. In the method of the present invention, the embedded watermark is divided into template and meaningful information, and the watermark is embedded in the discrete Fourier amplitude coefficient of the audio, and which Fourier amplitude coefficient each watermark bit is embedded in is determined according to the discrete logarithmic coordinates of the Fourier amplitude coefficient. When the audio is subjected to attacks such as stretching, clipping, and DA / AD conversion, there is still a strong correlation between the magnitude coefficient and the watermark information in the Fourier discrete logarithmic domain. When detecting and extracting the watermark, the information watermark is resynchronized according to the correlation between the original template and the amplitude coefficient of the Fourier discrete logarithm domain of th...

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Abstract

The inserted watermark includes the model board (MB) and the meaningful info (MI). This invention inserts the watermark into the audio scatter Fourier amplitude coefficient (FAC). Each watermark bit is inserted into which FACs according to the FAC scatter logarithm coordinate. When the audio info happens to be attacked, e.g. extended, cut or DA / AD converted, the amplitude coefficient (AC) and the watermark info are still strongly related in the Fourier scatter logarithm domain (FSLD). When the watermark is verified or drawn, the watermark info is re-synchronized according to the correlation between the FSLD ACs of the original MB and the inserting MB. Then the meaningful watermark info bit series is drawn. Due to audio inner-insert calculation on audio or its FAC is unnecessary during the watermark inserting and verifying process, the insert distortion is avoided and time is saved. As a novel audio watermark technique, this invention can be applied in areas of digital audio copyright protection, audio authentication and broadcast supervision, etc.

Description

technical field [0001] The invention belongs to the field of multimedia signal processing, in particular to a robust audio watermark technology based on Fourier discrete logarithmic coordinate transformation. Background technique [0002] In recent years, digital watermarking technology has demonstrated its importance in many application fields, and has been widely valued. Most current research and literature on data hiding focus on image watermarking. With the widespread use of digital audio, piracy, such as downloading MP3s through the Internet and then publishing pirated copies, has often occurred. As an effective means to protect audio intellectual property rights, digital audio watermarking is attracting more and more attention. [0003] According to the search, so far no report on the application of Fourier discrete logarithmic transform to audio signals has been found. In the present invention, it was found that the Fourier discrete logarithmic transform has very g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/00G06F17/14G10L19/018
Inventor 康显桂杨锐黄继武
Owner SUN YAT SEN UNIV
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