Gen2nd:

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   Creates a second order transfer function.

          s^2/wz^2 + 2 zz s/wz + 1
   K(s) = ------------------------
          s^2/wp^2 + 2 zp s/wp + 1

   Since version 1.
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   Form:
   [a, b, c, d] = Gen2nd( zz, wz, zp, wp, tSamp, sType )
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   ------
   Inputs
   ------
   zz                   Damping ratio of the zero pair
   wz                   Undamped natural frequency of the zero pair
   zp                   Damping ratio of the pole pair
   wp                   Undamped natural frequency of the pole pair
   tSamp                Sampling frequency
   sType                State equation type ('Delta' or 'Z')

   -------
   Outputs
   -------
   a                    Plant matrix
   b                    Input matrix
   c                    Measurement matrix
   d                    Feedthrough matrix

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	References:	  Wie, B., K. Byun, "New Generalized Structural Filtering
                 Concept for Active Vibration Control Synthesis,"
                 J. Guidance and Control, Vol. 12, No. 2, March-April 1989,
                 pp. 147-154.
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Children:

Common: Control/C2DZOH
Common: Control/C2DelZOH
Common: Control/FResp
Common: Control/ND2SS