Design And Implementation Of Speech Coding Secure Communication System Based On DSP

Voice communication is one of the most important means in modern communications. With the information society and the rapid development of communication technology, bandwidth resources become increasingly more important, so compressed digital voice signal of the transmission bandwidth has been the people's pursuit. At the same time how to ensure that the content of communications traffic is not stolen has become a people's research key. Digital signal processing theory and high-speed high-performance digital signal processor (DSP) continue to emerge, so that real-time implementation of the digital voice signal coding and data encryption is possible.In this paper, theory of chaotic encryption and voice coding technology as the background, achieve the speech signal coding and encryption system on TMS320VC5509A DSP chip. In order to save bandwidth, to facilitate the achievement and to ensure good voice quality, speech coding algorithm was adopted the G.726 ADPCM speech coding algorithm, at the same time in order to ensure a large enough key space, uses Lorenz equations to generate key mapping chaotic stream as the encryption method. The TMS320VC5509 of basic structure and function modules is first presented, then gives the details of the system hardware and software design, the speech coding and chaotic encryption algorithm from the relevant theoretical knowledge introduced to the algorithm implementations on the DSP in detail discussed, focusing on the real-time speech signal coding and decoding, encryption and decryption software and hardware in the DSP implementation techniques at last. The whole system not only compress speech signal to save channel bandwidth, but encrypted the compressed data in order to ensure information security. So it has a good application prospects.Finally the system carried on the test and simulation, Good results show that basically met the design requirements...