Fixed-point Dsp-based Fir Digital Filter Design,

Digital filter algorithm is one of the core techniques in signal processing. The FIR digital filter has been widely used in signal processing field because of its strict linear phase and stability, now, it becomes a very significant research task. DSP chip is a sort of microprocessor which is especially suitable for digital signal processing, it is mostly used to realized different digital signal arithmetic Real-time and fleetly. The realization of the FIR digital filter which is based on DSP chip , not only have the merit of good stability, high precision, and have no effect of environmental., but also, by change the parameter of the filter to change the characteristic of the filter; because of the programmability of the DSP chip. Its design is very flexible.In this paper, the mainly task is researching the basic theories of the digital filter, and analyzing the designing and realization of the Finite Impulse Response digital filter (FIR), especially the method which realized under MATLAB environment, the window functions is primarily introduced, the method of using the digital filter design tools in MATLAB is also applied. It also compiles a procedure with MATLAB language which can select four sorts of digital filter and seven kinds of window functions. Then, this paper researches the structure and property of the 16 bit fixed-point DSP chip TMS320C5402, and writes the FIR filter program which is debugged and simulated by experiments. The design of the FIR filter using DSP is discussed, which focus on the method of coefficient transmission over passing debugging the DSP program in MATLAB. Finally, a digital filter system with preferable capability is designed based on the C5402, its consists of the design of hardware interface, which including the clock-generating circuit, the chip power supply circuit, the AID and D/A chip connecting interface, the FLASH chip connecting interface, extended RAM connecting interface and so on.