Method and device for detecting MP3 file authenticity
A technology of authenticity and file, applied in the field of communication, it can solve the problems of human ear distinction, threat of authenticity of digital audio, low accuracy rate, etc., and achieve the effect of improving the accuracy rate
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[0030] The number of quantized MDCT coefficients of the original MP3 file approximately obeys the Laplace distribution, but after the MP3 file is double MP3 compressed, the distribution of the quantized MDCT number will change, that is, the histogram distribution of the quantized MDCT coefficients will deviate from the Laplace distribution After double compression, the Fourier transform side lobe of the histogram presents obvious fluctuations. Based on this finding, as long as the quantized MDCT coefficient histogram sequence of the MP3 file to be tested is judged by the volatility of the curve after Fourier transform, It can detect whether the MP3 file is double-compressed.
[0031] like figure 1 As shown, the present embodiment provides a kind of detection method of MP3 file authenticity, comprises the following steps:
[0032] S101: extracting the eigenvalue of the fluctuation level of the curve after the Fourier transform of the quantized MDCT coefficient histogram sequen...
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