An efficient method of FIR filtering based on impulse response rounding
Anton Bartolo, Bradley D. Clymer, Richard C. Burgess, John P. Turnbull · IEEE Transactions on Signal Processing · 1998
A new method of implementing efficient FIR filters is presented. It involves approximation of an equiripple FIR by a rounding operation and application of the derived impulse response by a simple recursive equation. The technique is extremely efficient for lowpass, highpass, bandpass, and bandstop filters with sharp transitions and low edge frequencies.