Design And Realization Of Digital Filter And Its Application System Based On TMS320C5402 Chip

DSP technology means the technology to accomplish digital signal processing. Nowadays DSPs are getting more and more attentions in the information field, due to its powerful signal processing ability, becoming a hot-point technique in communication and other relating signal processing areas. DSP chips produced by TI(Texas Instrument ) hold 50 percent in whole DSP market, many applications of digital signal processing are carried out around TI DSP.DSP chip is especially fit for digital signal processing, its main application is realizing all kinds of digital siginal processing arithmetics such as clove hitch, correlation ,all kinds of transforms etc. Realizing digital filters with DSP is an important application.The paper discusses the filter's software realization based on TMS320C5402, and finished the hardware system of noise-restraining. The arithmetic system was compiled with C and assemble language, distributing memory with RCP or CMD files , writing into chip and realizing expectable functions. The main works accomplished are as following: 1 realizing FIR filter with window function. The filter can satisfied different characteristics requirements by transferring four window functions, intercepting different filter archetypes.2 realizing FFT/IFFT with time-drawing. we can make frequency domain analysis and disposal with it. The arithmetic has important application in communication engineering.3 realization of three-segment equalizer. we can control spectrum through control to the signal amplitude.4 Self-adaptive filter, the most active one in digital filters. The improved LMS arithmetic can adaptive the minimum pulse response automatically by the guide line of minimum average square error and have the best filtering effect. The method is easy to practise and has been introduced extensively. We can process real time disposal to the voice signal with noise and get pure voice signal.5 noise restraining hardware system: the system's core is TMS320C5402 chip, including A/D,D/A,ROM and Logical circuit, it has realized noise restraining.There are five parts in this paper. The first chapter introduces the developing statement of DSP and filters. The second one discusses DSP's characteristics, performance index, development tools of software, repertoire and hardware structure. The third part in this paper describes FIR filter's window function method and its application. The fourth introduces self-adaptive filter's realization and itsapplication. The kernel of this paper locates in the third and fourth chapters. The last part of this paper draws the conclusion and conceives this task's betterments.