Servo Processor Receiving Photodetector Signals
First Claim
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1. A digital servo for an optical disk drive, comprising:
- an analog-to-digital converter for converting low-pass filtered and gain-adjusted versions of photodetector output signals into digital signals; and
a digital signal processor configured to receive the digital signals, the digital signal processor being further configured to determine a focus error signal (FES) and a tracking error signal (TES) from the digital signals, the digital signal processor being further configured to process TES and FES through servo algorithms to produce tracking and focus control signals.
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Abstract
A servo processor for an optical disk drive is provided that includes: an analog-to-digital converter for converting versions of photodetector output signals into digital signals; and a digital signal processor configured to receive the digital signals, the digital signal processor being further configured to determine a focus error signal (FES) and a tracking error signal (TES) from the digital signals, the digital signal processor being further configured to process TES and FES through servo algorithms to produce tracking and focus control signals.
102 Citations
8 Claims
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1. A digital servo for an optical disk drive, comprising:
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an analog-to-digital converter for converting low-pass filtered and gain-adjusted versions of photodetector output signals into digital signals; and a digital signal processor configured to receive the digital signals, the digital signal processor being further configured to determine a focus error signal (FES) and a tracking error signal (TES) from the digital signals, the digital signal processor being further configured to process TES and FES through servo algorithms to produce tracking and focus control signals. - View Dependent Claims (2, 3, 4)
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5. A digital servo method for an optical disk drive, comprising:
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receiving at an integrated circuit photodetector output signals resulting from an illumination of an optical disk; within the integrated circuit, digitizing versions of the photodetector signals to produce digital signals; in a digital signal processor, processing the digital signals into either a tracking error signal (TES) or a focus error signal (FES); and in the digital signal processor, processing TES or FES through a servo algorithm to produce a control signal, the control signal being adapted to drive an actuator such that either TES or FES is minimized. - View Dependent Claims (6, 7, 8)
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Specification