Determining a reference waveform used by a correlator in a servo channel
AssigneeInternational Business Machines Corporation
InventorsGiovanni Cherubini, Robert Allen Hutchins, Jens Jelitto
Life of this patent
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Abstract
Provided are a method, servo channel, and tape drive for determining a reference waveform used by a correlator in a servo channel. Sequences of servo signal samples are provided from read servo signals read from a servo pattern on a recording medium. A determination is made of a reference waveform based on the sequences of servo signal samples and the reference waveform is forwarded. Interpolated servo signals are generated. The interpolated servo signal samples and the forwarded reference waveform are received to generate correlation output samples. Position and velocity information are calculated from the correlation output samples.
Claims9
A method implemented in a servo channel, comprising:
- providing sequences of servo signal samples from read servo signals read from a servo pattern on a recording medium;
- selecting a reference waveform from a predetermined set of waveforms based on the sequences of servo signal samples;
- forwarding the selected reference waveform;
- generating interpolated servo signal samples:
- receiving the interpolated servo signal samples and the forwarded selected reference waveform to generate correlation output samples;
- and
- calculating position and velocity information from the correlation output samples.
Dependencies are inferred from the claim text.