An improved compensated prefilter structure using frequency response masking technique for efficient FIR filter design

In this paper, a new computationally efficient compensated prefilter structure is proposed for the design of narrowband lowpass as well as narrowband highpass Finite Impulse Response (FIR) filter. The proposed approach is able to achieve significant savings in hardware in terms of the number of multipliers and adders required when combined with Interpolated Finite Impulse Response (IFIR) technique. It is shown that the newly developed prefilter based on IFIR structure yield as much as 50% reduction in terms of the number of arithmetic operations when compared to the other IFIR based approach thus resulting in efficient hardware implementation. The proposed filter not only improves the computational efficiency but also minimize the passband error as compared with other existing design techniques.