Back to results
US 6,674,705 B1Granted
Low cost detection of wobble inversions using a bandpass tuned circuit
AssigneeHewlett-Packard Company
InventorD Mitchel Hanks
Life of this patent
Estimating the term…
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.
Claims10
A wobble inversion detector, comprising:
- a bandpass tuned circuit having an input and a tuned circuit output,
- a saturating high-gain amplifier having an output and receiving said tuned circuit outputs, wherein when a wobble signal is applied to said inputs, said amplifier output has at least a half-cycle of increased duration in response to a wobble inversion on said wobble signal.
A method of detecting wobble inversions, comprising:
- applying a wobble signal having a monotone wobble frequency to a bandpass tuned circuit having a bandpass output, wherein said bandpass tuned circuit has a natural frequency that is within an octave of said monotone wobble frequency;
- and,
- detecting changes on said bandpass output.
Dependencies are inferred from the claim text.