Digital audio watermarking method capable of resisting re-recording attack
A watermarking and audio technology, used in speech analysis, instruments, etc.
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[0024] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0025] A kind of digital audio watermarking method of the present invention can resist re-recording attack, its process is as follows figure 1 As shown, the specific steps are as follows:
[0026] (1), Extract watermark synchronization reference point
[0027] (1-1) Divide the carrier audio signal into audio frames of equal length, and the number of audio frames is L, Each audio frame has B =256 sampling points;
[0028] (1-2) Extract the semitone features of each audio frame: each audio frame is transformed by FFT to obtain the spectral component of each frame, and an octave centered at 1kHz is taken from the spectral component, and the frequency range of 707Hz~1414Hz contains 12 semitones , expressing the semitone feature sequence of the carrier audio signal as C i*j , i Indicates the number of frames, the range is ...
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