The double spiral wire solders are adopted to improve the connecting strength and reduce the overlappingcoefficient to less than 50 percent, thereby reducing the cost.
采用双螺旋焊线提高了连接强度，减少了重叠率使之小于50％， 从而达到成本低。
3
Based on introducing overlapping base matrix, the general calculating formula for the coefficient vector of windowed all-phase equivalent FIR filter is proposed.