PoZeTools v0.53

Enter your poles and zeros [and an optional gain] below:
# Symmetry-test: G = 1 P = 0.9 P = 0.9 Z = -0.9 Z = -0.9 # Empty lines and lines starting with # are ignored. Supply- # ing no gain invokes auto-normalization. Both polar and # cartesian notations are accepted. The order in which poles, # zeros and the (complex) gain appear does not matter. # Some valid lines are: P = 0.98 exp(-0.25 pi j) # P = j - 0.88 # Z = -j # Z = 0.6 + 0.6 j # G = exp(-j pi)
Read 2 zeros and 2 poles.

Logarithmic frequency scale.    

Frequency domain:

Time domain:

 a(0) = 1.000000000000
 a(1) = 1.800000000000
 a(2) = 0.810000000000

 b(0) = 1.000000000000
 b(1) = -1.800000000000
 b(2) = 0.810000000000

Linear difference equation:

  y[n] -1.8 y[n-1] + 0.81 y[n-2] =  x[n] + 1.8 x[n-1] + 0.81 x[n-2]