Research On High Robustness And High Capacity Algorithm Of Audio Information Hiding Technology

With the rapid development of Internet technology and digital audio technology,how to effectively protect digital audio copyright and information transmission has become a research hotspot in the field of information security.Audio information hiding technology embeds hidden information in the audio by using the auditory redundancy of human ear.Because of its high concealment,scholars at home and abroad has attracted in-depth research in audio information hiding technology.Audio information hiding technology has a wide range of applications in digital audio copyright protection and information security communication.This dissertation first introduces the audio information hiding technology in detail.Then a high robust audio information hiding algorithm and a high capacity audio information hiding algorithm according to the performance indicators of audio information hiding are proposed.Meanwhile,dissertation proposes the corresponding optimization scheme to improve the algorithm performance.Finally,the software of the audio information hiding system is implemented The main contributions and innovations of this dissertation are as follows:1.An audio information hiding algorithm with high robustness and imperceptibility is proposed.This algorithm not only solves the difficulty of combining psychoacoustic model with maximum ratio combining algorithm,but also proposes an optimized scheme of information extraction by using maximum ratio combining coefficient threshold,which greatly reduces the influence of noise on information extraction.The experimental results show that the robustness of the algorithm is increased by 2bB-3dB.It is not only suitable for high SNR transmission environment,but also suitable for low SNR transmission environment.2.A high capacity audio information hiding algorithm based on multi_bit mapping spread spectrum is proposed.The algorithm changes direct spread spectrum method,uses the multi_bit mapping spread spectrum method to embed the information,and uses the correlation characteristics of m sequence to extraction information at the receiver.In order to improve the robustness of the algorithm,this dissertation analyzes the influence of different length m sequences on the decoding performance,and proposes a new spread spectrum sequence set generation method.Experimental results show that the hiding capacity of the algorithm is double.Apart for that the algorithm has high robustness.3.The software of the audio information hiding system is implemented.Meanwhile,the function test and the performance test are tested in this dissertation.The test results show that the system realizes the basic functions design,and has quite superior decoding performance.