Algorithm of local robust digital voice-frequency watermark for preventing time size pantography

A technology of time scale and digital audio, which is applied in the field of robust algorithms with high resistance, and can solve problems such as time domain synchronization

Inactive Publication Date: 2005-12-28
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to propose a localized robust digital audio watermarking algorithm based on music content analysis to resist audio signal processing attacks and solve time domain synchronization problems caused by random clipping and time scale scaling.

Method used

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  • Algorithm of local robust digital voice-frequency watermark for preventing time size pantography
  • Algorithm of local robust digital voice-frequency watermark for preventing time size pantography
  • Algorithm of local robust digital voice-frequency watermark for preventing time size pantography

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Embodiment Construction

[0017] 1. Selection of watermark embedding area

[0018] The specific steps for selecting the watermark embedding area are as follows:

[0019] (1) First, carry out 5-level wavelet decomposition to the input original audio;

[0020] (2) Use denoising technology to smooth the d3 subband to make the peak more prominent;

[0021] (3) Calculate all local peaks on the d3 subband {P i};

[0022] (4) The watermark embedding area R on the original audio is calculated according to formula (1):

[0023] R={R i |R i =P i -ROILength / 4:P i +ROILength×3 / 4-1} (1)

[0024] where ROILength is the length of each small embedding region, equivalent to the length of a musical note or drum sound.

[0025] 2. Watermark embedding algorithm

[0026] The specific watermark embedding steps are as follows:

[0027] (1) Let iPeakNum be all P in step 1 i The number of embedded regions ROINum is calculated according to formula (2), the purpose is to ensure that it is an odd number so that t...

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Abstract

A localized robust digital - audio watermark algorithm resisting attack of time dimensional contraction and enlargement includes selecting embedded region of watermark, embedding watermark and detecting water mark. The invented method does not rely upon regulation of threshold or assumed parameters and it can be applied in different type of audio signals.

Description

technical field [0001] The invention belongs to the technical field of information hiding and digital watermarking in multimedia information security, and specifically relates to a brand-new robust algorithm capable of high-intensity resistance to Time-Scale Modification, the most difficult time-domain synchronous attack in digital audio watermarking technology. Background technique [0002] Digital audio watermarking technology is a technology that embeds specific meaning and easy-to-extract information into the original audio without affecting the quality of the original audio. As a supplement to traditional cryptography, digital watermarking provides the function of protecting audio works, and has become a research hotspot in recent years. In addition to being imperceptible to human auditory perception, watermarking must also be resistant to audio signal processing and synchronization attacks in the time domain. [0003] Synchronization attacks are a serious problem for ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/018
Inventor 李伟薛向阳陆佩忠
Owner FUDAN UNIV
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