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Anti-DA/AD converting audio-frequency watermark processing method

A processing method and audio watermarking technology, applied in speech analysis, instruments, etc., to achieve good robustness

Inactive Publication Date: 2007-01-03
SUN YAT SEN UNIV
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Problems solved by technology

[0006] In order to overcome the deficiencies in the prior art, the present invention proposes an anti-DA / AD conversion audio watermark processing method. Compared with the previous audio watermark processing methods, it can not only resist the influence of audio when it is transmitted under digital channels, such as MP3 Compression, superimposed noise and low-pass filtering, etc., and solve the problem of anti-DA / AD conversion that cannot be solved by previous algorithms, and provide a reliable means for protecting the copyright of audio data

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[0025] The method of the present invention will be further described below in conjunction with the accompanying drawings.

[0026] An anti-DA / AD conversion audio watermark processing method of the present invention includes two processes of watermark embedding and watermark detection.

[0027] 1. Watermark embedding

[0028] The watermark embedding process is as follows: figure 1 As shown, a long audio segment is first segmented, and a synchronous signal and part (or all) of the watermark data are hidden in each audio segment. The specific method is to do wavelet decomposition for each segment of audio first, and convert the synchronization signal and watermark into a {-1, 1} sequence, and then embed the {-1, 1} sequence into the low-frequency coefficients in the DWT domain. When the watermark is embedded, the method of adaptively adjusting the embedding strength is adopted to obtain the maximum value under the premise of satisfying the audio quality. After the watermark is...

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Abstract

The invention is a method of the audio frequency watermark handling which is based on DWT, resisting DA / AD transposition; it belongs to the safety field of multi-media information. The invention has two processes, one is watermark insertion, the other is watermark monitor; the watermark is inserted in the low frequency sub-strip of minor wave modulus to resist the attack against overlaying noise; three section of minor wave modulus are a group to insert a bit watermark information to remove the effect of energy change, the multiunit insert many bits of watermark; designing the re-synchronization technology based on the synchronization code and interpolation operation to remove the effect of the stretch of time axis. The invention can not only resist the effect on watermark brought by DA / AD transposition in effect , but also have great solidity against common attack operation (such as MP3 compression , noise etc.). Besides to protect the audio frequency production to transmit in digital route, the invention can protect the audio frequency data crossed the DA / AD equipment, and be used to monitor advertisement of the music broadcasting station.

Description

technical field [0001] The invention belongs to the field of multimedia signal processing, in particular to an audio watermark processing method based on discrete wavelet transform and anti-DA / AD transform. 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 through the Internet and secretly recording with DA / AD equipment, has occurred from time to time. As an effective means to protect audio intellectual property rights, digital audio watermarking is attracting more and more attention. [0003] The previous audio watermarking techniques can basically be classified into two categories: time-domain algorithms and frequency-domain algorithms. Time domain algorithms mainly include LSB method, echo hiding (echo cod...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/00G10L19/002
Inventor 项世军黄继武
Owner SUN YAT SEN UNIV
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