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to that of a DPLL (Digital Phase Locked Loop). The approach presented in this paper differs from this usual approach. The method we propose uses an auxiliary filter which attempts to predict the amplitude error due to sampling phase error. In the case of a PR4 (Partial Response class IV) channel this filter can be driven using the desired response samples which are from the set {O,? I} which removes the need to use any multiply operations thereby greatly reducing complexity. By using this auxiliary filter it is demonstrated that, for the PR4 case, the same performance can be achieved as with the usual interpolating approach, but with a less complex interpolator. This is attributed to the fact that in the usual approach the interpolator must provide interpolants to the detector based on noisy samples. In our approach the interpolants are instead used to drive the auxiliary filter from which the detector input is derived.

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