Methods and apparatus for performing cross-talk correction in a multi-track optical disk reader based on magnification error
AssigneeZen Research N.V.
InventorAmir Alon
Life of this patent
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Abstract
An optical pickup assembly for a multitrack optical disk reader includes a multi-element photodetector onto which a plurality of reflected track images are projected. Circuitry is provided for detecting a magnification error, and for generating a magnification error correction signal to correct or compensate for the magnification error. Circuitry is also provided for correcting for cross-talk components in the output signals of the multi-element photodetector responsive to the detected magnification error.
Claims20
Apparatus for simultaneously reading multiple adjacent tracks of an optical disk, the apparatus comprising:
- means for generating an array of reading beams including a center beam and a plurality of side beams, each side beam having a radial location in the array;
- an optical system disposed in a path of the array of reading beams, the optical system directing the array of reading beams onto multiple adjacent tracks of the optical disk;
- a plurality of photodetector elements including a center element and a plurality of side elements, the center element generating an output signal corresponding to the center beam, each one of the plurality of side elements generating an output signal for a corresponding one of the plurality of side beams;
- means for detecting a magnification error;
- and
- means for correcting the output signal of at least one of the plurality of side elements responsive to the magnification error and the radial location of the side beam in the array.
A method for simultaneously reading multiple data tracks from an optical disk, the method comprising:
- providing an array of reading beams including a center beam and a plurality of side beams, each side beam having a radial location in the array;
- providing a plurality of photodetector elements including a center element and a plurality of side elements, the center element generating an output signal corresponding to the center beam, each one of the plurality of side elements generating an output signal for a corresponding one of the plurality of side beams;
- generating a magnification error signal;
- correcting the output signal for at least one of the plurality of side elements responsive to the magnification error signal and the radial location of the side beam in the array.
Dependencies are inferred from the claim text.