Patent ID: 7694211
Filing Date: 2010-04-06
Classification: G11B,H03M

Abstract:
1. A method to recover data comprising: processing an encoded data stream in a first channel decoder producing a channel decoder output; processing the channel decoder output and the encoded data stream in all error compensation unit to compensate the channel decoder output for low frequency noise and produce an error compensated data stream; processing the error compensated data stream in a second channel decoder to produce a recovered data stream, wherein the recovered data stream has a reduction in the number of errors as compared to the encoded data stream; processing the channel decoder output in a partial response (PR) convolution unit to produce a PR convolution output; subtracting the PR convolution output from a first delayed encoded data stream to produce a first subtraction result; filtering the first subtraction result in a data stream filter to produce a filter output; and subtracting the filter output from a second delayed encoded data stream to produce the error compensated data stream.