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Blind audio watermark embedding and watermark extraction processing method

A processing method and watermark embedding technology, applied in speech analysis, instruments, etc., can solve the problem of weak robustness and achieve the effect of strong robustness

Inactive Publication Date: 2015-07-22
GUANGDONG UNIV OF PETROCHEMICAL TECH
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AI Technical Summary

Problems solved by technology

[0005] The present invention provides a processing method for blind audio watermark embedding and watermark extraction, so as to overcome the problems such as weak robustness existing in the existing audio watermark algorithm

Method used

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  • Blind audio watermark embedding and watermark extraction processing method
  • Blind audio watermark embedding and watermark extraction processing method
  • Blind audio watermark embedding and watermark extraction processing method

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Embodiment Construction

[0055] In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention. Obviously, the described embodiments are part of the embodiments of the present invention , but not all examples. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0056] In the present invention, the coordinate point of the center of gravity of the fan is selected as the robust feature point of the audio watermarking algorithm, so the center of gravity of the fan is firstly explained.

[0057] Definition: Fan center of gravity

[0058] The Normed Center of Gravity (NCG) is the first-order statistic of the signal, which has the characteristics of small...

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Abstract

The invention provides a blind audio watermark embedding and watermark extraction processing method. The method includes: dividing an original audio carrier signal into multiple audio subframes at fixed length; respectively calculating norm barycentric coordinates of each audio subframe; selecting audio sampling points of each audio subframe in a certain area by taking the norm barycentric coordinates of the corresponding audio subframe as a center; performing discrete cosine transform on the audio sampling points of each audio subframe, and adaptively and quantitatively embedding watermark information in medium-low-frequency coefficient being subjected to discrete cosine transform; performing inverse transform on discrete cosine transform coefficient after being subjected to adaptive and quantitative embedding of the watermark information to generate audio signals containing the watermark information. Substantive characteristics namely norm barycentric characteristics of the audio signals are utilized, so that robustness of the audio signals is improved, and algorithm safety is guaranteed due to using of a chaotic sequence.

Description

technical field [0001] The invention relates to audio processing technology, in particular to a processing method for blind audio watermark embedding and watermark extraction. Background technique [0002] With the continuous development of the Internet and digital audio processing technology, countless digital audio works are continuously released and widely disseminated. In order to protect the copyright and content integrity of digital audio works, digital audio watermarking technology has emerged as the times require and has become an important aspect in the field of information security. Research hotspots. [0003] Different from the first-generation digital watermarking technology that directly embeds watermark information into time-domain samples or transform-domain coefficients, Koitter first proposed a content-based second-generation digital watermarking technology. The core technology of the second-generation audio watermarking algorithm is content-based feature e...

Claims

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Application Information

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IPC IPC(8): G10L19/018
Inventor 崔得龙吕晓兰弓云峰
Owner GUANGDONG UNIV OF PETROCHEMICAL TECH
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