[Lo_D,Hi_D,Lo_R,Hi_R] = wfilters('db4');spa
Hi_D =filter
-0.230377813308855 0.714846570552542 -0.630880767929590 -0.027983769416984db
0.187034811718881 0.030841381835987 -0.032883011666983 -0.010597401784997