Design Of Adaptive Filter Based On DSP Systems

With the development of the technology in the adaptive filtering and the very large scale integration (VLSI), it offers the theory and technical support for studying to cancel noises in communication system . In the system of communication ,the useful signal is picked up from noise by the technology of adaptive filtering. It will have the wide applicative prospect .The adaptive noise canceling system develops from the adaptive filtering system.lt can improve the quality of signal by picking up and detecting the useful signal or canceling noise in the environment which was interfered by noise. The purpose of this dissertation is to design an adaptive noise canceling system. The main task is divided into two parts .In the first part,the article intruduced the basic theory of adaptive filter and adptive noise canceling system .It analyse the index and function of the adaptive noise canceling system.The adaptive algorithm is the essence of the system.In this part, the article intruduced and campare two basic algorithm,the LSM and RLS algorithm .The most important point in this part is simulinking by MATLAB and analyzing the result of simulinking which prove the feasibility of the design and algorithm.In the second part,the task is to design the hardware and software for adaptive noise canceling system. On the foundation of the first part, puting up a design of canceling noise by taking advantage of DSP chip (TMS320LF2407),on which it realized the LMS algorithm .the article put forward a new method of testing DSP online,the system controlled by MCU(89S51),and showed us the circuit diagram.At the end of the article,the author wrote out the flow diagram for programming and give out the list of programming.