Tms320vc5509a Of Voice Encryption And Decryption System Hardware And Software Design

This piece of paper using chaos algorithm realizes an encryption system, based on TMS320VC5509A. The encryption system can realize the voice signal encryption and decryption, also can realize voice recording and audio signal encryption, it can be used for real-time voice communications occasions(such as telephone, mobile communications) and non-real-time voice communications occasions (such as telephone, voice mail).In the hardware design, the system uses the digital signal processor of TMS320VC5509A as the core, high-fidelity voice codec chip TLV320AIC23,synchronous dynamic random access memory SDRAM and asynchronous memory FLASH as the main peripherals.The part of hardware circuit design specifically includes power modules, clock modules, external expansion memory modules, audio codec modules, JTAG interface, the bootstrap mode and audio processing mode settings section.According to the functional requirement of the system,the software part of this thesis includes two projects, the voice project of user application and the burning project realizing bootstrap of DSP. Chaos system is very sensitive to the original value,having the characteristics of white noise and pseudo-random, etc.Such properties make it difficult to be analyzed and predicted, this piece of paper compares the advantages and disadvantages of a variety of encryption and decryption algorithm,using chaos algorithm which conbines Logistic mapping and Joseph transformation. With Joseph transformation, this thesis disrupts the plain text, increasing the key space and improving the security of encryption.Based on CCS development environment, this piece of paper has parallel EMIF-boot mode to achieve the on-chip bootloader of the digital signal processor of TMS320VC5509A after online simulation. It is proved that the design scheme of the system is effective.