Patent ID: 7860190

Claim:
A multi-channel timing recovery system for use in a magnetic storage device comprising: two or more data channel timing recovery circuits each comprising: a digital interpolator operative to: receive offset values and a digitized input stream comprising a series of digital values corresponding to an amplitude of an input data signal sampled at a sampling rate; and provide interpolated values based on the digitized input stream and the offset values; a phase error detector, coupled to the digital interpolator, operative to determine phase error based on the interpolated values, the determined phase error comprising a stream of local phase error values; a loop filter, coupled to the phase error detector operative to filter the stream of local phase error values and provide a stream of filtered local phase error values, wherein the filtered local phase error values comprise an aggregate of a local phase error component and a local bit rate component; a numerically-controlled oscillator operative to provide the offset values responsive to an input stream of phase error values; a global rate integrator operative to integrate a sum of the respective streams of local phase error values from the phase error detectors of the two or more data channel timing recovery circuits to provide a stream of global phase error values, the stream of global phase error values characterizing an average observed bit rate; a first switch disposed between the loop filter and the numerically-controlled oscillator; and an event detector coupled to an output of the digital interpolator and operative to: detect an event; and open the first switch when the event is detected; wherein the input stream of phase error values provided to each of the numerically-controlled oscillators comprises a sum of the respective filtered local phase error values and the global phase error values.