Servo processor receiving photodetector signals
First Claim
1. A digital servo method for an optical disk drive, comprising:
- controlling functions of the optical disk drive with a microprocessor;
receiving low-pass filtered and gain-adjusted versions of photodetector output signals resulting from an illumination of an optical disk;
digitizing versions of the photodetector signals to produce digital signals; and
determining, through at least one servo algorithm executed by a digital signal processor, a focus control signal based on a focus error determined from the digital signals, wherein the digital signal processor is an integrated circuit structured and arranged for manipulation of digital signals in accordance with programmed commands, and in a manner that operates faster than the microprocessor.
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Accused Products
Abstract
An optical disk drive and a digital servo method for the optical disk drive includes controlling functions of the optical disk drive with a microprocessor. Low-pass filtered and gain-adjusted versions of photodetector output signals resulting from an illumination of an optical disk are received. Versions of the photodetector signals are digitized to produce digital signals. A focus control signal is determined through at least one servo algorithm executed by a digital signal processor based on a focus error determined from the digital signals. Alternatively, a tracking control signal is determined through at least one servo algorithm executed by the digital signal processor based on a tracking error determined from the digital signals. The digital signal processor has a specialized structure and arrangement for processing digital signals at a higher speed than the microprocessor.
448 Citations
34 Claims
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1. A digital servo method for an optical disk drive, comprising:
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controlling functions of the optical disk drive with a microprocessor; receiving low-pass filtered and gain-adjusted versions of photodetector output signals resulting from an illumination of an optical disk; digitizing versions of the photodetector signals to produce digital signals; and determining, through at least one servo algorithm executed by a digital signal processor, a focus control signal based on a focus error determined from the digital signals, wherein the digital signal processor is an integrated circuit structured and arranged for manipulation of digital signals in accordance with programmed commands, and in a manner that operates faster than the microprocessor. - View Dependent Claims (7)
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2. A digital servo method for an optical disk drive, comprising:
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controlling functions of the optical disk drive with a microprocessor; receiving low-pass filtered and gain-adjusted versions of photodetector output signals resulting from an illumination of an optical disk; digitizing versions of the photodetector signals to produce digital signals; and determining, through at least one servo algorithm executed by a digital signal processor, a tracking control signal based on a tracking error determined from the digital signals, wherein the digital signal processor is an integrated circuit structured and arranged for manipulation of digital signals in accordance with programmed commands, and in a manner that operates faster than the microprocessor.
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3. A digital servo method for an optical disk drive, comprising:
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controlling functions of the optical disk drive with a microprocessor; low-pass filtering and gain-adjusting versions of photodetector output signals resulting from an illumination of an optical disk; digitizing versions of the photodetector signals to produce digital signals; and determining, through at least one servo algorithm executed by a digital signal processor, a focus control signal based on a focus error determined from the digital signals, wherein the digital signal processor is an integrated circuit structured and arranged for manipulation of digital signals in accordance with programmed commands, and in a manner that operates faster than the microprocessor. - View Dependent Claims (4, 5, 6)
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8. A digital servo method for an optical disk drive, comprising:
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controlling functions of the optical disk drive with a microprocessor; low-pass filtering and gain-adjusting versions of photodetector output signals resulting from an illumination of an optical disk; digitizing versions of the photodetector signals to produce digital signals; and determining, through at least one servo algorithm executed by a digital signal processor, a tracking control signal based on a tracking error determined from the digital signals, wherein the digital signal processor is an integrated circuit structured and arranged for manipulation of digital signals in accordance with programmed commands, and in a manner that operates faster than the microprocessor. - View Dependent Claims (9, 10, 11, 12)
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13. An optical disk drive, comprising:
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a microprocessor configured to perform control functions of the optical disk drive; an analog-to-digital converter configured to convert low-pass filtered and gain-adjusted versions of photodetector output signals into at least one digital signal; and a digital signal processor configured to determine a focus error from the at least one digital signal and to determine, through at least one servo algorithm executed by the digital signal processor, a focus control signal from the focus error, wherein the digital signal processor is an integrated circuit structured and arranged for manipulation of digital signals in accordance with programmed commands, and in a manner that operates faster than the microprocessor.
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14. An optical disk drive, comprising:
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a microprocessor configured to perform control functions of the optical disk drive; an analog-to-digital converter configured to convert low-pass filtered and gain-adjusted versions of photodetector output signals into at least one digital signal; and a digital signal processor configured to determine a tracking error from the at least one digital signal and to determine, through at least one servo algorithm executed by the digital signal processor, a tracking control signal from the tracking error, wherein the digital signal processor is an integrated circuit structured and arranged for manipulation of digital signals in accordance with programmed commands, and in a manner that operates faster than the microprocessor.
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15. An optical disk drive, comprising:
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a microprocessor configured to perform control functions of the optical disk drive; at least one low pass filter; at least one amplifier; an analog-to-digital converter configured to convert, into at least one digital signal, versions of photodetector output signals low-pass filtered by the at least one low pass filter and gain-adjusted by the at least one amplifier; and a digital signal processor configured to determine a focus error from the at least one digital signal and to determine, through at least one servo algorithm executed by a digital signal processor, a focus control signal from the focus error, wherein the digital signal processor is an integrated circuit structured and arranged for manipulation of digital signals in accordance with programmed commands, and in a manner that operates faster than the microprocessor. - View Dependent Claims (16, 17, 18)
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19. An optical disk drive, comprising:
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a microprocessor configured to perform control functions of the optical disk drive; at least one low pass filter; at least one amplifier; an analog-to-digital converter configured to convert, into at least one digital signal, versions of photodetector output signals low-pass filtered by the at least one low pass filter and gain-adjusted by the at least one amplifier; and a digital signal processor configured to determine a tracking error from the at least one digital signal and to determine, through at least one servo algorithm executed by a digital signal processor, a tracking control signal from the tracking error, wherein the digital signal processor is an integrated circuit structured and arranged for manipulation of digital signals in accordance with programmed commands, and in a manner that operates faster than the microprocessor. - View Dependent Claims (20, 21, 22)
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23. A non-transitory computer readable medium storing a computer program, executable by a machine, for a digital servo method for an optical disk drive, the computer program comprising executable instructions for:
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controlling functions of the optical disk drive with a microprocessor; low-pass filtering and gain-adjusting versions of photodetector output signals resulting from an illumination of an optical disk; digitizing versions of the photodetector signals to produce digital signals; and determining, through at least one servo algorithm executed by a digital signal processor, a focus control signal based on a focus error determined from the digital signals, wherein the digital signal processor is an integrated circuit structured and arranged for manipulation of digital signals in accordance with programmed commands, and in a manner that operates faster than the microprocessor.
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24. A non-transitory computer readable medium storing a computer program, executable by a machine, for a digital servo method for an optical disk drive, the computer program comprising executable instructions for:
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controlling functions of the optical disk drive with a microprocessor; low-pass filtering and gain-adjusting versions of photodetector output signals resulting from an illumination of an optical disk; digitizing versions of the photodetector signals to produce digital signals; and determining, through at least one servo algorithm executed by a digital signal processor, a tracking control signal based on a tracking error determined from the digital signals, wherein the digital signal processor is an integrated circuit structured and arranged for manipulation of digital signals in accordance with programmed commands, and in a manner that operates faster than the microprocessor.
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25. A non-transitory computer readable medium storing a computer program, executable by a machine, for a digital servo method for an optical disk drive, the computer program comprising executable instructions for:
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controlling functions of the optical disk drive with a microprocessor; receiving low-pass filtered and gain-adjusted versions of photodetector output signals resulting from an illumination of an optical disk; digitizing versions of the photodetector signals to produce digital signals; and determining, through at least one servo algorithm executed by a digital signal processor, a focus control signal based on a focus error determined from the digital signals, wherein the digital signal processor is an integrated circuit structured and arranged for manipulation of digital signals in accordance with programmed commands, and in a manner that operates faster than the microprocessor. - View Dependent Claims (26, 27, 28, 29)
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30. A non-transitory computer readable medium storing a computer program, executable by a machine, for a digital servo method for an optical disk drive, the computer program comprising executable instructions for:
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controlling functions of the optical disk drive with a microprocessor; receiving low-pass filtered and gain-adjusted versions of photodetector output signals resulting from an illumination of an optical disk; digitizing versions of the photodetector signals to produce digital signals; and determining, through at least one servo algorithm executed by a digital signal processor, a tracking control signal based on a tracking error determined from the digital signals, wherein the digital signal processor is an integrated circuit structured and arranged for manipulation of digital signals in accordance with programmed commands, and in a manner that operates faster than the microprocessor. - View Dependent Claims (31, 32, 33, 34)
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Specification