The Study Of Audio Watermarking In Wavelet Domain Based On The Visual Cryptography

With the publishing of a great deal of sound image product and music product, the copyright protection of audio frequency data seems to be more and more important, however, audio frequency digital watermark takes a very important part of role in this field. Comparing with the image watermarking , the audio watermarking have a few characteristics: 1.Comparing with the visual media ,audio frequency signal has less sampling points at every time interval.2.Owing to human audition systems ,it is more sensitive than human vision systems ,therefore, it is more trouble to realize the imperceptibility of audition compared to the vision systems.3.To stick up to the cut attack ,embedded watermark should keep synchronization.4.Because of the bigger memory payload of audio frequency signal, the initial audio frequency signal must be removed during the extract in order to protect the maneuverability of project. So the audio frequency watermarks have more defiant compared to the static image and video frequency watermark.Audio frequency watermark can be classified three grades according to the different loading forms of watermark: time field watermark, transform field watermark and compressing field watermark. A mass of algorithm of time field watermark offers a simple and effective project, besides it has bigger information embedding payload. But it hasn't a enough ability to process the sound signal. The transform field watermark has a powerful ability to stand against the signal processing and hostile attack, but the process of embedding and extract are relatively complex. The algorithm of pressing field watermark puts the watermark signal on the pressing audio frequency directly, it can avoid of the complex process of coding and decoding of pressing algorithm, but its stabilization and haleness aren't high, and the payload of embedded watermark is small.When we design the algorithm of watermark, the security of...