Blind audio watermark implementing method based on logarithmic quantization index modulation

A technology of index modulation and implementation method, which is applied in speech analysis, instrumentation, etc., and can solve problems such as small embedding amount, multi-spectrum, and occupancy

Inactive Publication Date: 2012-09-12
TSINGHUA UNIV
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Problems solved by technology

The main disadvantages are: too much spectrum is occupied, and the amount of embedding is small; the premise of blind detection is that the watermarked audio signal and the watermarked random signal must be completely synchronized
The main disadvantage is: it is sensitive to noise, and the algorithm uses a fixed quantization step size, which introduces a large quantization noise, so the extraction bit error caused by the data fluctuation caused by quantization noise is relatively high

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  • Blind audio watermark implementing method based on logarithmic quantization index modulation
  • Blind audio watermark implementing method based on logarithmic quantization index modulation
  • Blind audio watermark implementing method based on logarithmic quantization index modulation

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Embodiment Construction

[0050] The blind audio watermark implementation method based on logarithmic index modulation proposed by the present invention includes two parts: a watermark embedding module and a watermark extraction module:

[0051] 1) Watermark embedding module: used to embed watermark information. Put the original audio signal X={x i , 1≤i≤L} Carry out a two-level discrete wavelet transform DWT, where L is the number of original audio sampling points, and the approximate component B={b i , 1≤i≤L / 4}, divide the approximate component into M×M non-overlapping frames S i , 1≤i≤M×M, calculate each frame S i The vector norm σ of i , 1≤i≤M×M, and let σ max =max(σ i ), 1≤i≤M×M, and for the vector norm σ of each frame i Calculate as follows: c i = σ i / σ max ,λ i =ln(1+μc i ) / ln(1+μ), d=λ i modΔ, Δ is the preset quantization step size, μ is the parameter of mu-law companding. Using the binary watermark image W={w ij , 1≤i≤M, 1≤j≤M} and the chaotic sequence and formula We can get...

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Abstract

The invention discloses a blind audio watermark implementing method based on logarithmic quantization index modulation, and belongs to the technical field of audio watermarks. The blind audio watermark implementing method is characterized by including sufficiently utilizing robustness of vector norms and imperceptibility of the logarithmic quantization index modulation based on mu-law companding; improving safety and robustness of a watermark by the aid of a chaos sequence encryption watermark image; converting the sectioned vector norms of wavelet approximate components into a transform domain via the mu-law companding; then embedding an encryption binary watermark image; and extracting the binary watermark image after the watermark is attacked. The audio watermark algorithm has the advantages of high volume, fine tone, imperceptibility and robustness and low complexity, the watermark still can be correctly extracted by the aid of the method under various watermark attack conditions, and accordingly amplitude attack can be effectively resisted by the method.

Description

technical field [0001] The invention relates to a blind audio watermark implementation method based on logarithmic index modulation. The method not only has the characteristics of high capacity and good sound quality, but also has the advantages of good imperceptibility, good robustness and low complexity. In the case of various watermark attacks, the method can still be used to extract the watermark correctly, and this method can effectively resist the amplitude attack. Background technique [0002] Digital watermarking (Digital Watermarking) is to use the redundancy of human perception system (such as visual or auditory system) to embed some identification information in images, audio and other carriers, but it does not affect the use value of the original carrier. [0003] According to different watermarking carriers, watermarking technology can be divided into several categories such as video watermarking, image watermarking, and audio watermarking. At present, video an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/00G10L19/018
Inventor 王新凯王鹏军张鹏徐淑正杨华中
Owner TSINGHUA UNIV
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