A. Djebbari et al., NOISE-REDUCTION IN RECURSIVE DIGITAL-FILTERS USING OPTIMAL AND SUBOPTIMAL ERROR FEEDBACK, International journal of electronics, 83(6), 1997, pp. 743-751
The normal form of narrow bandpass digital filters is shown to be suit
able for the application of error feedback to reduce roundoff error no
ise. The problem of solving for the optimal (minimum noise) feedback c
oefficients is addressed for normal and direct form recursive digital
filters. A suboptimal solution, useful for reducing implementation cos
ts, is also presented.