Audio Digital Watermarking-based Algorithm

With the development of digital multimedia technology, digital watermark has become a popular topic in the field of digital copyright protection..Audio digital watermarking technique is application on the audio field,with such technique we can embed secred information into audio files,so as to get'copyright protection'and'cover communication'etc...This paper focus on the audio digital watermarking technique in order to protect audio file's copyrightFirst,I completed the temporal domain digital watermarking algorithm.The information of watermarking were embedded in the largest value of the amplitude by sorted. This algorithm was proved that is weaker in robust,but it is sa mple and embedded large data.In order to improve the robust of watermarking algorithm, this paper analyzed the frequency domain watermark algorithm. Embedded the watermark information into intermediate frequency in the DCT-based watermark algorithm by seek the feature field. This paper chose the dbl wavelet transform to get intermediate frequency in the DWT-based watermarking algorithm by multiplication regulation.Furthermore,this paper put forward a automatic and adaptive algorithm that can calculate the suitable threshold. This suggested algorithm makes use of the frequence analysis of the psychoacoustic model to make the embedded watermark inaudible.This idea is used in watermark embedded algorithms based on DWT and DCT combinition.