Robust digital audio watermark method based on discrete fraction transformation

A digital audio and watermarking technology, applied in speech analysis, instruments, etc., can solve problems such as malicious attacks, and achieve the effects of resisting malicious attacks, simple algorithms, and easy implementation

Inactive Publication Date: 2009-05-27
SOUTHWEST JIAOTONG UNIV
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  • Abstract
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AI Technical Summary

Problems solved by technology

This shows that the traditional transform-based watermarking algorithm has security risks that are vulnerable to malicious attacks.

Method used

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  • Robust digital audio watermark method based on discrete fraction transformation
  • Robust digital audio watermark method based on discrete fraction transformation
  • Robust digital audio watermark method based on discrete fraction transformation

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Embodiment Construction

[0022] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0023] 1. Watermark embedding: such as figure 1 process to embed the watermark.

[0024] (1) Segmentation of the original audio signal: the image 3 The shown original audio signal A={a(i)|1≤i≤L} is divided into L1 segments, denoted as A s (g, l), 1≤g≤L 1 , 1≤l≤L / L 1 , L 1 =M×N, here, M×N is such as Figure 4 The size of the binary watermark W shown in this example is L=2097152, M=N=64.

[0025] (2) Fast Fourier Transform: FFT is performed on each audio segment to obtain A s ′ ( g , l ) = FFT ( A s ( g , l ) ) ...

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Abstract

The present invention discloses a robust digital audio frequency watermark method based on discrete fractional transformation, comprises following procedures to original audio frequency signal: segmenting FFT; choosing middle frequency coefficient in each audio frequency segmentation FFT domain for embedding watermark; to get a final audio frequency signal including digital watermark. Compared with existing transform-domain audio frequency watermark algorithm, discrete fractional transformation angel uncertainty is fully utilized through the invention, and special angel of discrete fractional transformation of each audio frequency segment is selected according to some certain rules. In this way, robustness to general audio frequency signal processing attack by the invention can be guaranteed, malicious attack can be resisted strongly, and audio frequency signal quality will descend severely while attackers destroying watermark. The invention also has strong robustness to general audio frequency signal processing attack with simple algorithm, can be easily realized, and is beneficial to practical application of robust audio digital frequency watermark technology.

Description

technical field [0001] The present invention relates to a robust audio digital watermarking method based on discrete fractional transformation, which is a method especially suitable for copyright protection of digital audio signals, that is, under the conditions of conventional audio signal processing attacks and malicious attacks, it can effectively Audio copyright is protected. Background technique [0002] With the rapid development of multimedia technology and network communication technology, the dissemination of multimedia works has become extremely convenient and fast. However, on the other hand, the intellectual property rights of many authors and publishers have also been severely violated, and problems such as piracy and infringement have become increasingly prominent. Therefore, copyright protection in the network environment has become one of the problems that need to be solved urgently. At present, the digital watermarking technology to solve this kind of probl...

Claims

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Application Information

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IPC IPC(8): G10L19/00G10L19/018
Inventor 王宏霞范明泉
Owner SOUTHWEST JIAOTONG UNIV
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