Patent ID: 7751137
Filing Date: 2010-07-06
Classification: G11B

Abstract:
1. A method to control inter-symbol interference (ISI) comprising: performing a timing recovery to determine when to sample an analog signal to recover a stored bit sequence that includes a preamble, synchronization (sync) mark, data and postamble, wherein the preamble, sync mark and postamble have respective predefined series of bits; sampling the analog signal to generate an analog waveform, wherein a sampled bit sequence is derived from the analog waveform; pruning from a set of possible bit sequences, a number of bit sequences to be disallowed from bit sequence detection based on knowledge of the stored bit sequence by: disallowing bit sequences associated with pruned trellis paths from bit sequence detection; and comparing the sampled bit sequence to allowable bit sequences remaining after pruning to perform bit sequence detection to recover the stored bit sequence.