Multifunctional Audio Digital Watermark Based On Wavelet Packet Algorithm

Digital watermark technology is a kind of intellectual property right protection means developed in recent years. As improvement and e-commerce of the global information-based intensity move towards gradually being practical, the requirements for intellectual property protection are extremely urgent, digital watermark technology was just put forward under this kind of background. The digital audio watermarking is one kind of the digital watermark. To the research of the digital audio watermarking, have proposed various algorithms both at home and abroad, but there is less research about the audio watermarking.This paper is on the basis of already existing additive watermark algorithm based on that the discrete wavelet transform, propose one multi-functional digital audio watermarking algorithm that decompose on the basis of wavelet-packet, audio signal embeds the robust watermark in the low frequency part separately after the wavelet-packet three layers to decompose, embeds the fragile watermark in intermediate frequency part. Adopted the embedding intensity principle of making use of SNR to confirm the watermark when the robust watermark is embedded, under guaranteeing the situation not discernable of the watermark, increased the embedding amount of the watermark, have improved resisting the ability of attacking of the watermark. Fragile watermark is embedded the intermediate frequency coefficient of audio signal being carried on mean quantize, can must live in general transmission course objective and distorted, lose and distort, have stronger sensitiveness subjectively to more serious information. The artificial experimental result indicates, this algorithm does not have the very good one audibility, fairly good robustness and stronger fragility.