Comments on "Calculation of L norms for scaling second-order state-space digital filters sections" by B.W. Bomar and R.D. Joseph

In a previously published paper (see ibid., vol.34, no.8, p.983-4, 1987), an expression for L/sub infinity / norms was derived for a particular second-order digital transfer function. It is shown that closed-form expressions for L/sub infinity / norms for any general biquadratic digital transfer function ar available in the literature.<
>