A unified approach to general IFIR filter design using B-spline functions
Donald Pang, Luca Ferrari, P.V. Sankar · 1989
This paper presents an efficient procedure for the design of interpolated FIR (IFIR) filters with linear phase. The algorithm uses the uniform B-spline function a6 an interpolator and solves the optimal Chehyshev approx. imation problem on the appropriate subinterval. The technique can he used for the design of general lowpass, highpass and bandpass filters. Although the number ofmuLtipLicstions of the IFIR filter is dependent on the bandwidth and the center frequency of the desired filter, our program provider the mininun number of multiplications achievable and nearly always provides a substantial reduction when compared to Parks-MeClellan designs.