butt_bp_ord=6;
butt_bp_num=[0.00002883,0.00017296,0.00043239,0.00057652,0.00043239,0.00017296,0.00002883;...
    0.00530041,0.00000000,-0.01590123,0.00000000,0.01590123,0.00000000,-0.00530041;...
    0.03168934,0.00000000,-0.09506803,-0.00000000,0.09506803,-0.00000000,-0.03168934;...
    0.03168934,0.00000000,-0.09506803,0.00000000,0.09506803,0.00000000,-0.03168934;...
    0.00105165,-0.00630988,0.01577470,-0.02103294,0.01577470,-0.00630988,0.00105165];
butt_bp_den=[1.00000000,-4.48456301,8.52900508,-8.77910797,5.14764268,-1.62771478,0.21658286;...
    1.00000000,-4.42459751,8.79771496,-9.95335557,6.75320305,-2.60749972,0.45354593;...
    1.00000000,-1.84699031,2.63060194,-2.21638838,1.57491237,-0.62291281,0.19782519;...
    1.00000000,1.84699031,2.63060194,2.21638838,1.57491237,0.62291281,0.19782519;...
    1.00000000,2.97852993,4.13608100,3.25976428,1.51727884,0.39111723,0.04335699];

smooth_ord=2;
smooth_num=[1,-1,0];
smooth_den=[1,-1.9266,0.9409];
%freqz(smooth_num,smooth_den);

dcr_ord=4;
dcr_num=[0.9269,-3.7056,5.5574,-3.7056,0.9269];
dcr_den=[1.00000000,-3.84610723,5.55209760,-3.56516069,0.85918839];
%freqz(dcr_num,dcr_den);

smooth_num=[1,-1,0];
smooth_den=[1,-1.9266,0.9409];
freqz(smooth_num,smooth_den);