Audio Wireless Communication Of Chaos And Realization Of DSP Technology

Due to the sensitivity to the initial value, any small margin of error can amplified by the chaotic system. Therefore, the long-term performance of the system is unpredictable; In addition, as the chaotic sequence has an excellent statistic characteristic which can be applied to the sequence encryption technology, it can be made use of to produce random sequence. As the founder of the information theory, Shannon(American mathematician) points out:if we are able to, by some means, produce a random sequence which is determined by the key, and any small change in the input would have a great effect on the output, we can implement the encryption by using such sequence.Chaotic system meet this kind of requirement very well.The characteristic of the chaotic system does not conform to rationale of the probability statistics based on the value distribution, which you can not obtain a stable probability distribution feature. Besides, chaotic number set does not only belong to the real number realm, but to realm of complex number. As a result, theoretically, using the chaotic theory for encryption can protect your data from some certain decoding methods, such as frequency analysis attack, method of exhaustion, making the code hard to be analysed or cracked.Along the constant development of digital signal processing component in recent year, the chaotic system's application also had the considerable progress, but actually the report about the chaos applies be also lacking relatively. After collection, reorganization, analysis and synthesis of domestic and foreign correlation data, I has designed Audio wireless communication based on chaotic security in order to prevent easily monitor of wireless voice communications.This system,which takeing DSP as a processor,useing Lorenz chaotic encryption algorithm and using the oscilloscope, CCSLink as auxiliary research tool, has realized the chaos security wireless communication.The primary research is as follows:1. The Lorenz system's simple dynamics characteristic is researched. By the comparison similitude and diversity of cryptology and the chaos encryption, there are drawing a conclusion:The outstanding mix characteristic of chaos guarantees the equally good diffusion and confusion between the chaotic encryption and the traditional encryption algorithm.Finally, the chaos system's secrecy is analyzed through the LNIST judgment rule.2. Lorenz system's drive-response synchronization is analyzed by Lyapunov stability theory,.there makes a compare between the general cover privacy communication and communication combined the closed loop with feedback, secrecy and the stability of this kind of improved cover security communication is analyzed.3.Via the usage of the DSP and speech and communication chips et cetera, I build up hardwares for the speech wireless communication. Not only do I use the DSP/BIOS in the CCS3.3 to coordinate the speech compression algorithm and chaotic encryption algorithm and driving programme to optimal state, but I write a common SPI communication protocol.4.Through the CCSLink debugging of the MATLAB and the analysis of the communication data, I do an in-depth study of the problems and drawbacks of the the audio chaotic secret wireless communication system, which I put forward some solutions that can improve the robust of the system and the quality of decoded audio.