Patent ID: 6625235
Filing Date: 2003-09-23
Classification: G11B

Abstract:
A detector apparatus for noise-predictive maximum likelihood detection for encoded or uncoded data sequences having passed a partial-response equalizer, comprising:a maximum likelihood sequence detector; and an infinite impulse response noise predictor providing input to said maximum likelihood sequence detector, said infinite impulse response noise predictor predicting noise as a function of a difference between an input of said detector apparatus and reconstructed samples derived from an output of said maximum likelihood sequence detector; wherein said infinite impulse response noise predictor executes a transfer function from the set of transfer functions consisting of: (A) &agr;D/(1âˆ’&agr;D), where &agr; is a preselected scaling factor and D is a unit delay operator; and (B) (âˆ’(&agr;1+&bgr;1)Dâˆ’(&agr;2+&bgr;2)D2)/(1+&agr;1D+&agr;2D2), where &agr;1, &agr;2, &bgr;1, and &bgr;2 are preselected scaling factors and D is a unit delay operator.