// second order filter model 
// transfer function:
// G(s) = Omega^2 / ( s^2 + 2 * Zeta * Omega * s + Omega^2  )
// Omega is angular frequency 
// Zeta  is damping factor
// 
// inp is input state variable
 

class Filter2nd(inp, Omega, Zeta  ) 
{
	var m_state  = State( int ( int ( sqr(Omega) * ( inp.value - m_state.value) ) - 2.0 * Zeta * Omega * m_state.value )  );	
};