Optical disk with copy protection, and apparatus and method for recording and reproducing same
First Claim
1. An optical disk having data bit indications along a spiral centerline of said disk, said bit indications defining a channel clock having a frequency of fCC clock cycles per unit of arcuate length along said centerline, said data bit indications further defining a radial wobble about said centerline, along at least a predefined segment of said centerline, said wobble having substantially greater energy at a predefined frequency fCPW than at a frequency of fCC /196.
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Accused Products
Abstract
Copy-protected optical disk format, optical disk recording apparatus for creating disks having such formats and optical disk reading apparatus for reading disks having such formats and for determining whether the disks are authentic. In one aspect, an authentic optical disk has data bit indications along a spiral centerline of the disk, and these data bit indications define a radial wobble which has substantially greater energy at a predefined frequency fCPW (such as fCC /392) than at a frequency of fCC /196, where fCC is the spatial channel clock frequency. In another aspect, an authorized optical disk has data bit indications along a substantially spiral centerline of the disk, according to a channel clock whose frequency varies across the disk. The disk further has stored thereon an indication of the number of such channel clock cycles which occur along a predetermined test segment of the centerline, optionally together with a pointer to the test segment. Since normal data stream copying techniques do not copy the exact channel clock rates on the disk, and since the copying equipment will inherently introduce its own channel clock variations across the resulting disk, the predetermined test segment on the copy will not have the number of channel clocks as that specified by the data indicating the number of channel clock cycles to expect along the test segment.
169 Citations
37 Claims
- 1. An optical disk having data bit indications along a spiral centerline of said disk, said bit indications defining a channel clock having a frequency of fCC clock cycles per unit of arcuate length along said centerline, said data bit indications further defining a radial wobble about said centerline, along at least a predefined segment of said centerline, said wobble having substantially greater energy at a predefined frequency fCPW than at a frequency of fCC /196.
- 7. An optical disk having data bit indications along a spiral centerline of said disk, said bit indications defining a channel clock having a frequency of fCC clock cycles per unit of arcuate length along said centerline, said data bit indications further defining a radial wobble about said centerline, along at least a predefined segment of said centerline, said wobble having substantially greater energy at a frequency fCPW than at a predefined reference frequency fREF, where fCPW is approximately equal to an integer sub-harmonic of fCC /196.
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11. A method for making an optical disk in response to a data bit stream, comprising the steps of:
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writing bit indications in response to said data bit stream onto said disk along a substantially spiral centerline of said disk, in accordance with a channel clock having a frequency of fCC clocks per unit of arcuate length along said centerline; wobbling said bit indications radially about said centerline, along at least a predefined segment of said centerline, in accordance with a predefined wobble pattern, said wobble pattern having substantially greater energy at a predefined frequency fCPW than at a frequency of fCC /196. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. A method for making an optical disk in response to a data bit stream, comprising the steps of:
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writing bit indications in response to said data bit stream onto said disk along a substantially spiral centerline of said disk, in accordance with a channel clock having a frequency of fCC clocks per unit of arcuate length along said centerline; wobbling said bit indications radially about said centerline, along at least a predefined segment of said centerline, in accordance with a predefined wobble pattern, said wobble pattern having substantially greater energy at a frequency fCPW than at a predefined reference frequency fREF, where fCPW is approximately equal to an integer sub-harmonic of fCC /196. - View Dependent Claims (20, 21)
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22. Optical disk recording apparatus, for use with a data stream signal defining a channel clock having a frequency of fCC clocks per unit time, comprising:
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a spinner for spinning a disk; a write head disposed relative to said disk and directing a writing beam toward a surface of said disk, said writing beam being moveable radially relative to said disk so as to traverse a substantially spiral centerline of said spinning disk, said write head modulating said beam in response to said data stream signal, said write head further having a deflection signal input and deflecting said beam radially with respect to said disk in response to a signal received on said deflection signal input; and a wobble control circuit having an output connected to said deflection signal input, said wobble control circuit producing an output signal on its output which has substantially greater energy at a predefined frequency fCPW than at a frequency of fCC /196, at least. - View Dependent Claims (23, 24, 25, 26)
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27. Optical disk recording apparatus, for use with a data stream signal defining a channel clock having a frequency of fCC clocks per unit time, comprising:
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a spinner for spinning a disk; a write head disposed relative to said disk and directing a writing beam toward a surface of said disk, said writing beam being moveable radially relative to said disk so as to traverse a substantially spiral centerline of said spinning disk, said write head modulating said beam in response to said data stream signal, said write head further having a deflection signal input and deflecting said beam radially with respect to said disk in response to a signal received on said deflection signal input; and a wobble control circuit having an output connected to said deflection signal input, said wobble control circuit producing an output signal on its output which has substantially greater energy at a frequency fCPW than at a predefined reference frequency fREF, where fCPW is approximately equal to an integer sub-harmonic of fCC /196. - View Dependent Claims (28, 29)
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36. Optical disk recording apparatus, comprising:
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a spinner for spinning a disk; a write head disposed relative to said disk and directing a writing beam toward a surface of said disk, said writing beam being moveable radially relative to said disk so as to traverse a substantially spiral centerline of said spinning disk, said write head modulating said beam in response to a beam modulation signal; and a modulation signal provider which provides said beam modulation signal in accordance with a first channel clock frequency fCC1 when said beam is traversing a first predetermined segment of said centerline, and which provides said data stream signal in accordance with a second channel clock frequency fCC2 when said beam is traversing a second predetermined segment of said centerline, said spinner spinning said disk at a first linear velocity when said beam is traversing said first predetermined segment of said centerline and spinning said disk at a second linear velocity substantially equal to said first linear velocity when said beam is traversing said second predetermined segment of said centerline, wherein fCC1 bears a predetermined non-equal relationship to fCC2 and said write head further has a deflection signal input and deflects said writing beam radially with respect to said disk in response to a signal received on said deflection signal input, further comprising; a wobble control circuit having an output connected to said deflection signal input, said wobble control circuit producing an output signal on its output which has substantially greater energy at a frequency fCPW than at a predefined reference frequency fREF, where fCPW is approximately equal to an integer sub-harmonic of fCC /196.
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37. Optical disk recording apparatus, comprising:
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a spinner for spinning a disk; a write head disposed relative to said disk and directing a writing beam toward a surface of said disk, said writing beam being moveable radially relative to said disk so as to traverse a substantially spiral centerline of said spinning disk, said write head modulating said beam in response to a beam modulation signal; and a modulation signal provider which provides said beam modulation signal in accordance with a first channel clock frequency fCC1 when said beam is traversing a first predetermined segment of said centerline, and which provides said data stream signal in accordance with a second channel clock frequency FCC2 when said beam is traversing a second predetermined segment of said centerline, said spinner spinning said disk at a first linear velocity when said beam is traversing said first predetermined segment of said centerline and spinning said disk at a second linear velocity substantially equal to said first linear velocity when said beam is traversing said second predetermined segment of said centerline, wherein fCC1 bears a predetermined non-equal relationship to fCC2 and said write head further has a deflection signal input and deflects said writing beam radially with respect to said disk in response to a signal received on said deflection signal input, further comprising; a wobble control circuit having an output connected to said deflection signal input, said wobble control circuit producing an output signal on its output which has substantially greater energy at a frequency fCPW than at a predefined reference frequency fREF, where fCPW is approximately equal to an integer sub-harmonic of fCC3 /196.
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Specification