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In this paper we address the problem of designing a nonuniform filter bank (NUFB) using a mixed H2/H∞ optimisation. The solution to H∞ optimisation for minimising the worst case error norm is not unique. Hence we optimise with respect to an additional H2 criterion. It results in a mixed H2/H∞ optimisation problem. We formulate the optimisation problem as a linear matrix inequality (LMI). To remove the structural dependencies in the synthesis stage and to achieve low circuit layout complexity, we design an efficient synthesis stage. We perform simulations using the LMI tool-box in MATLAB to validate the theory.