The general methods are polynomial approximation and Chebyshevapproximation.
常见的方法有多项式逼近,切比雪夫多项式逼近。
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By using MATLAB signal and using window method, frequency sampling and Chebyshevapproximation the design of low pass digital filter in the toolbox have been processed.
This paper describes the approximation of active filters. An optimum seeking method is used to calculate the filter functions which have the form of Chebyshevapproximation functions.