Fast Parallel Linear Phase Fir Filter Implementation Based on Fast Fir Algorithm

Abstract

In recent days filters with large lengths are started to use. So parallel processing is essential at any cost. In this paper proposes new parallel FIR filter structures, which are beneficial to symmetric coefficients in terms of the hardware cost, under the condition that the number of taps is a multiple of 2 or 3. The proposed parallel FIR structures use symmetric property to reducing half the number of multipliers in sub filter section at the expense of additional adders in preprocessing and post processing blocks. Exchanging multipliers with adders is advantageous because adders weigh less than multipliers in terms of silicon area; in addition, the overhead from the additional adders in preprocessing and post processing blocks stay fixed and do not increase along with the length of the FIR filter, whereas the number of reduced multipliers increases along with the length of the FIR filter. Parallel FIR filter is essential, especially when the length of the filter is large. Overall, the proposed parallel FIR structures can lead to significant hardware savings for symmetric convolution in odd length from the existing FFA parallel FIR filter, particularly when the length of the filter is large.