Comments on "Design of IIR filters in the complex domain" (by X. Chen and T.W. Parks)

In commenting on the above namework (see ibid., vol.38, no.6, p.910-20, 1990) it is shown how good starting values can be obtained for the minimax design of infinite impulse response (IIR) digital filters in the complex domain with the Ellacott-Williams (1976, 1979) algorithm.<
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