Low cost detection of wobble inversions using a tuned circuit
AssigneeHewlett-Packard Development Company, L.P.
InventorD Mitchel Hanks
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Abstract
A tuned circuit is used to detect wobble clock inversions. The tuned circuit reacts to a wobble inversion with a change in amplitude that may be detected by a threshold detector. A bandpass tuned circuit is used to detect wobble clock inversions. The output of the bandpass tuned circuit is input to a saturating high-gain amplifier such as a comparator. The output of the saturating high-gain amplifier reacts to wobble inversions with a half-cycle that has an increased duration as compared to half-cycles without wobble inversions.
Claims5
A wobble inversion detector for detecting wobble inversions in a wobble signal, said wobble signal having a wobble frequency associated therewith, said detector comprising:
- a circuit having an input and an output, said circuit being tuned to a frequency that is different than the frequency of said wobble signal;
- wherein said input is connectable to a source of said wobble signal;
- and
- wherein the voltage at said output changes in amplitude when a wobble inversion occurs on said wobble signal, said change in amplitude being indicative of a wobble inversion.
Dependencies are inferred from the claim text.