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
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[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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