Patent ID: 7089483
Filing Date: 2006-08-08
Classification: G11B,H03M,H04L

Abstract:
1. A maximum likelihood detector for use within a partial response channel having a channel transfer function and passing user information sequences encoded into code words in accordance with a channel code, the maximum likelihood detector comprising: a channel sampler for generating raw samples from the code words; a channel equalizer for generating equalized samples from the raw samples using the channel transfer function; a first-stage detector for generating unchecked code words from the equalized samples, wherein the first-stage detector is matched to the channel transfer function and the first-stage detector is not matched to the channel code; and a second-stage post-processor for generating corrected code words from the raw samples and the unchecked code words, wherein the second-stage post-processor is matched to the channel code and includes: a decision metrics filter for generating most likely error-events by comparing the error-events with predetermined error-events using the channel code; and