biquad1,
b0=0.9998643814806082,
b1=-1.9991978832889572,
b2=0.9993485987712496,
a1=1.9991978832889572,
a2=-0.9992129802518577,
biquad2,
b0=1.0006394636946139,
b1=-1.998760369548655,
b2=0.998158262230658,
a1=1.998760369548655,
a2=-0.9987977259252718,
biquad3,
b0=1.0001219764628568,
b1=-1.999293649745767,
b2=0.9992212868078529,
a1=1.999293649745767,
a2=-0.9993432632707098