A low-complexity 2-D spatially-interpolated FIR trapezoidal filter for enhancing broadband plane waves

A low-complexity 2-D FIR trapezoidal filter is proposed for enhancing broadband plane waves. Motivated by the design technique of 1-D interpolated FIR filters, the proposed filter is realized by cascading a low-complexity spatiallyupsampled 2-D FIR filter having a trapezoidal passband and a low-complexity 2-D FIR masking filter having a parallelogram passband. Experimental results confirm that the proposed filter provides 74% reduction of the computational-complexity compared to conventional 2-D FIR fan and conventional 2-D FIR trapezoidal filters without deteriorating the performance in enhancing 2-D broadband plane waves distorted by strong interference and noise signals.