A NOVEL-APPROACH TO THE SYNTHESIS OF RECURSIVE DIGITAL-FILTERS WITH LINEAR-PHASE

The synthesis of recursive digital filters with linear phase is approached by means of existing approximation techniques. The design is based on an FIR filter that represents the ideal filter in terms of both magnitude and phase characteristics. The recursive digital filter with linear phase is then synthesized as an approximation of the ideal FIR filter. This novel technique is used for designing both 1-D and 2-D recursive digital filters with linear phase, and is illustrated by a few numerical examples.