Using Matlab to Design FIR Digital Filter
Chunyu Li · 2005
By using MATLAB signal and using window method, frequency sampling and Chebyshev approximation the design of low pass digital filter in the toolbox have been processed. In view of the designed program of MATLAB and the figure of the amplitude-frequency characterization,this paper analyszes the different characteristics of the above three methods. At the same time it compares the approximation quality of design filter to the given filter .The result shows that it is simple to use window method and Chebyshev approximation method(call remez function) to design, but complicated to use the frequency sampling method .The filter designed with the method of Chebyshev approximation has minimal error in the whole frequency and the quality of the filter is the best.