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Time-domain digital audio watermarking method based on audio breakpoint

A digital audio and watermarking technology, applied in speech analysis, instruments, etc., can solve problems such as algorithm writing obstacles and discrete Fourier transform ignorance, and achieve good auditory characteristics, robustness, good practicability, and superior auditory characteristics Effect

Inactive Publication Date: 2015-07-29
NORTHEAST NORMAL UNIVERSITY
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Problems solved by technology

Although wavelet transform has good time-frequency local characteristics, non-signal processing-related scholars don't even know what discrete Fourier transform (DFT) is, which brings technical obstacles to algorithm writing

Method used

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  • Time-domain digital audio watermarking method based on audio breakpoint
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  • Time-domain digital audio watermarking method based on audio breakpoint

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Embodiment Construction

[0030] The examples in the scheme are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0031] The specific implementation of the present invention is divided into two parts: embedding and extraction of watermark. The following descriptions take a musical composition signal with a sampling rate of 44.1kHz as an example:

[0032] 1. Watermark embedding process

[0033] (1) Watermark image design and encryption processing: design a h The two-dimensional lattice watermark image of w. In this example, the values ​​of h and w are both 64, and the designed image is encrypted using Arnold scrambling transformation, and the iteration parameters are recorded.

[0034] Re-branching of watermarked images: Convert the original pixel point to h The two-dimensional lattice watermark image of w is divided into p parts (p=2, 4,..., h) in units of rows, so that each row of the re-divided watermark image has information of h / p r...

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Abstract

The invention provides a method for embedding and extracting digital audio watermarks in a time domain on the basis of audio breakpoints, and an energy value of an original audio is directly changed on the basis of the original audio according to a numerical value of watermark information and the energy value of the original audio. Only little change is made on the basis of an original signal, and good robustness, cutting resistance and less information increase of watermarks are guaranteed on the premise that the hearing quality of the original audio is not influenced. In a watermark extraction link, the positions of the embedded watermarks can be automatically screened by an extraction algorithm, information which looks like watermarks in numerical logic is excluded, and the capability of storing original watermark information is provided. According to the method, the watermark information is encrypted. The used watermark extraction scheme is a blind watermark algorithm and can be used for processing audio signals, protecting audio products and the like, only fragmentation information of the original audio and reconstruction parameters of watermark signals are needed, and the participation of the original audio and original watermarks is not needed.

Description

[0001] technical field [0002] The invention belongs to the field of audio signal processing and audio product patent protection, and relates to watermark embedding and extraction of audio signals. Background technique [0003] In recent years, with the emergence and rapid development of computer network technology, a large number of digital music products have been widely disseminated on the Internet. In this way, for illegal elements, the reproduction, tampering and distribution of audio works have become very easy. This has brought huge losses to copyright owners and the entire music market. [0004] Based on this background, digital watermarking technology for copyright protection of digital works has been developed. Digital audio watermarking algorithms are mainly divided into time domain and transform domain digital watermarking algorithms. The time-domain watermarking algorithms mainly include the least significant bit (LSB) algorithm proposed by P.Bassia et al. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/018
Inventor 王双维卢宇郑彩侠曹晓林刘天星
Owner NORTHEAST NORMAL UNIVERSITY
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