Design and efficient implementation of narrow-band single filter frequency masking FIR filters

In this paper a new structure for frequency masking FIR filters is introduced. By using identical model and masking filters (except for the periodicity) folding can be used to efficiently implement the filter by mapping all subfilters to a single hardware structure. The resulting structure will for most cases require fewer multipliers and adders compared to conventional narrow-band frequency masking techniques. The cost is an increase in the number of delay elements.