Digital filter design using root moments for sum-of-all-pass structures from complete and partial specifications

This paper is concerned with the development of digital filter design procedures for transfer functions in the form of sum-of-all-pass in which the requirements may be partially specified. Specifically, the requirements for a digital filter or equalizer in amplitude A(/spl theta/), or phase /spl phi/(/spl theta/), or possibly group-delay response /spl tau/(/spl theta/), may be specified from measurements over a limited a set of frequencies {/spl theta//sub 1/,/spl theta//sub 2/}. The problem is to develop techniques for the design a transfer function H(z) satisfying these specifications and constrained to be in the form of a sum-of-two-all-pass functions. The proposed solution is based on the use of root moments. The companion problem concerned with the estimation of the orders of the required all-pass filters is also examined and a solution proposed based on the same context of root moments.

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