Computationally Efficient Direct Multiplier-free Minimum-phase FIR Filter Design

This paper presents one simple method for the direct FIR minimum-phase multiplier-free filter design. The prototype filter is a cascade of the corresponding comb and cosine filters as well as cosine prefilters, which do not require any multipliers. We use the modified sharpening technique to improve the magnitude characteristic of this cascade in both, the passband and stopband and to preserve the minimum-phase characteristic. In that way we design directly the desired minimum-phase filter from the given specification. The method is limited to the narrowband minimum-phase filter design