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A method for simultaneous detection of concurrent servo bursts for fine head positioning of a disk drive (Synchronous Detection of Concurrent Servo Bursts for Fine Head Position in Disk Drive)
A method for simultaneous detection of concurrent servo bursts for fine head positioning of a disk drive (Synchronous Detection of Concurrent Servo Bursts for Fine Head Position in Disk Drive)
Discloses a method for simultaneously detecting fine position servo burst information with a data transducer having an electrical width not less than about 2/3 of the width of the data track in the partial response maximum probability (PRML) data channel. The servo burst information is recorded on a storage medium as a pair or a series of scattered-dot-width sine-wave simultaneous burst patterns, and on-track phase and frame boundaries that generate a position error signal that varies linearly with head displacement relative to the track centerline At least one off-track phase is generated that produces a position error signal that varies linearly with the head displacement to the position. The method includes reading the on-track and off-track phases using a head to provide a fine position analog signal, amplifying and low-pass filtering the signal to normalize the gain, Providing digital burst samples; multiplying the synchronized digital burst samples by the normalization factor generated by the correlation signal generator during servo sampling intervals to provide normalized samples; generating normalized samples To provide an on-track position error signal, and integrating the normalized samples generated during the off-track phase to provide an off-track position error signal. Also disclosed is a circuit implementing the above method, including a discrete matched filter.
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