Optical disc signal processing device, optical disc signal processing method, optical disc reproduction and recording device, and optical disc reproduction and recording method

An optical disc signal processing device comprising:

• a drive means which changes the physical position or angle of an optical pickup;
• an error detection means which detects the physical positional relation between the optical pickup and a recording medium from an electric signal generated by the optical pickup;
• a control target value change means which changes a control target value in the optical disc signal processing device;
• a control means which controls the drive means according to the outputs from the error detection means and the control target value change means;
• an adjustment reference signal generation means which generates an adjustment reference signal for adjusting the control target value;
• a control target value adjustment means which adjusts the control target value changed by the control target value change means, on the basis of the output from the adjustment reference signal generation means;
• a margin measurement means which obtains a range of the control target value from its minimum value to its maximum value, said control target value being changed by the control target value change means, within which range the optical disc signal processing device can perform normal operation;
• a condition setting means which sets a threshold value of the adjustment reference signal when measuring the range using the margin measurement means;
• a utilization rate measurement means which measures the utilization rate of the optical disc signal processing device;
• a nonvolatile memory which stores the range of the control target value from its minimum value to its maximum value, which is obtained by the margin measurement means, together with the utilization rate outputted from the utilization rate measurement means;
• a comparison means which compares the range of the control target value from its minimum value to its maximum value, which is stored in the nonvolatile memory, with the control target value which is adjusted by the control target value adjustment means;
• a number-of-rotations selection means which selects the number of rotations of the recording medium on the basis of the output from the comparison means;
• a number-of-rotations acquisition means which obtains the number of rotations of the recording medium;
• and
• a rotation control means which outputs a drive signal for rotating the recording medium with the target number of rotations according to the outputs from the number-of-rotations selection means and the number-of-rotations acquisition means;
• wherein the range of the control target value from its minimum value to its maximum value, which is obtained by the margin measurement means, is stored in the nonvolatile memory together with the utilization rate which is outputted from the utilization rate measurement means and the number of rotations of the recording medium which is outputted from the number-of-rotations acquisition means, and the number-of-rotations of the recording medium is optimized by the number-of-rotations selection means so that the control target value adjusted by the control target value adjustment means is included in the range of the control target value from its minimum value to its maximum value, which range is obtained by the margin measurement means and stored in the nonvolatile memory.

An optical disc signal processing device comprising:

• a drive means which changes the physical position or angle of an optical pickup;
• an error detection means which detects the physical positional relation between the optical pickup and a recording medium from an electric signal generated by the optical pickup;
• a control target value change means which changes a control target value in the optical disc signal processing device;
• a control means which controls the drive means according to the outputs from the error detection means and the control target value change means;
• an adjustment reference signal generation means which generates an adjustment reference signal for adjusting the control target value;
• a control target value adjustment means which adjusts the control target value changed by the control target value change means, on the basis of the output from the adjustment reference signal generation means;
• a margin measurement means which obtains a range of the control target value from its minimum value to its maximum value, said control target value being changed by the control target value change means, within which range the optical disc signal processing device can perform normal operation;
• a condition setting means which sets a threshold value of the adjustment reference signal when measuring the range using the margin measurement means;
• a utilization rate measurement means which measures the utilization rate of the optical disc signal processing device;
• a nonvolatile memory which stores the range of the control target value from its minimum value to its maximum value, which is obtained by the margin measurement means, together with the utilization rate outputted from the utilization rate measurement means;
• and
• a maximum utilization rate estimation means which estimates a utilization rate with which the range of the control target value from its minimum value to its maximum value becomes equal to or lower than a threshold value, from the utilization rate of the optical disc signal processing device which is stored in the nonvolatile memory and the range of the control target value from its minimum value to its maximum value which is obtained by the margin measurement means.

An optical disc signal processing device comprising:

• a drive means which changes the physical position or angle of an optical pickup;
• an error detection means which detects the physical positional relation between the optical pickup and a recording medium from an electric signal generated by the optical pickup;
• a control target value change means which changes a control target value in the optical disc signal processing device;
• a control means which controls the drive means according to the outputs from the error detection means and the control target value change means;
• an adjustment reference signal generation means which generates an adjustment reference signal for adjusting the control target value;
• a control target value adjustment means which adjusts the control target value changed by the control target value change means, on the basis of the output from the adjustment reference signal generation means;
• a margin measurement means which obtains a range of the control target value from its minimum value to its maximum value, said control target value being changed by the control target value change means, within which range the optical disc signal processing device can perform normal operation;
• a condition setting means which sets a threshold value of the adjustment reference signal when measuring the range using the margin measurement means;
• a utilization rate measurement means which measures the utilization rate of the optical disc signal processing device;
• a nonvolatile memory which stores the range of the control target value from its minimum value to its maximum value, which is obtained by the margin measurement means, together with the utilization rate outputted from the utilization rate measurement means;
• a maximum utilization rate estimation means which estimates the utilization rate with which the range of the control target value from its minimum value to its maximum value becomes equal to or lower than a threshold value, from the utilization rate of the optical disc signal processing device which is stored in the nonvolatile memory and the range of the control target value from its minimum value to its maximum value which is obtained by the margin measurement means;
• and
• a warning output means which outputs a warning message when the output result of the maximum utilization rate estimation means varies exceeding the predetermined threshold value.

An optical disc signal processing device comprising:

• a drive means which changes the physical position or angle of an optical pickup;
• an error detection means which detects the physical positional relation between the optical pickup and a recording medium from an electric signal generated by the optical pickup;
• a control target value change means which changes a control target value in the optical disc signal processing device;
• a control means which controls the drive means according to the outputs from the error detection means and the control target value change means;
• an adjustment reference signal generation means which generates an adjustment reference signal for adjusting the control target value;
• a control target value adjustment means which adjusts the control target value changed by the control target value change means, on the basis of the output from the adjustment reference signal generation means;
• a margin measurement means which obtains a range of the control target value from its minimum value to its maximum value, said control target value being changed by the control target value change means, within which range the optical disc signal processing device can perform normal operation;
• a condition setting means which sets a threshold value of the adjustment reference signal when measuring the range using the margin measurement means;
• a utilization rate measurement means which measures the utilization rate of the optical disc signal processing device;
• a nonvolatile memory which stores the range of the control target value from its minimum value to its maximum value, which is obtained by the margin measurement means, together with the utilization rate outputted from the utilization rate measurement means;
• a program change means which changes a program for managing the respective means;
• a program comparison means which compares the identification information of the program for the previous margin measurement which is stored in the nonvolatile memory with the identification information of the changed program;
• and
• a warning output means which compares, based on the output from the program comparison means, the range of the control target value from its minimum value to its maximum value, with which the optical disc signal processing device can perform normal operation, which range is obtained after the program has been changed by the program change means, with the range of the control target value from its minimum value to its maximum value, which is stored in the nonvolatile memory, and outputs a warning message when the range of the control target value which is obtained after the program change is reduced exceeding a threshold value as compared with the range of the control target value which is stored in the nonvolatile memory.

An optical disc signal processing method comprising:

• a driving step of changing the physical position or angle of an optical pickup;
• an error detection step of detecting the physical positional relation between the optical pickup and a recording medium from an electric signal generated by the optical pickup;
• a control target value change step of changing a control target value in an optical disc signal processing device;
• a control step of controlling the drive step according to the outputs from the error detection step and the control target value change step;
• an adjustment reference signal generation step of generating an adjustment reference signal for adjusting the control target value;
• a control target value adjustment step of adjusting the control target value changed in the control target value change step, on the basis of the output from the adjustment reference signal generation step;
• a margin measurement step of obtaining a range of the control target value from its minimum value to its maximum value, said control target value being changed in the control target value change step, within which range the optical disc signal processing device can perform normal operation;
• a condition setting step of setting a threshold value of the adjustment reference signal when measuring the range in the margin measurement step;
• a utilization rate measurement step of measuring the utilization rate of the optical disc signal processing device;
• a storage step of storing the range of the control target value from its minimum value to its maximum value, which is obtained in the margin measurement step, into a nonvolatile memory together with the utilization rate outputted from the utilization rate measurement step;
• a comparison step of comparing the range of the control target value from its minimum value to its maximum value, which is stored in the nonvolatile memory, with the control target value which is adjusted in the control target value adjustment step;
• and
• an adjustment method switching step of changing the change amount of the control target value to be changed in the control target value change step, on the basis of the number of measurements for the adjustment reference signal that is used for adjusting the control target value in the control target value adjustment step or the output from the control target value adjustment step, and switching the control target value adjustment method on the basis of the output from the comparison step;
• wherein the adjustment method used in the control target value adjustment step, or the number of measurements for the adjustment reference signal, or the change amount of the control target value is optimized so that the control target value adjusted in the control target value adjustment step is included in the range of the control target value from its minimum value to its maximum value, which is obtained in the margin measurement step and stored in the nonvolatile memory.

An optical disc signal processing method comprising:

• a driving step of changing the physical position or angle of an optical pickup;
• an error detection step of detecting the physical positional relation between the optical pickup and a recording medium from an electric signal generated by the optical pickup;
• a control target value change step of changing a control target value in an optical disc signal processing device;
• a control step of controlling the drive step according to the outputs from the error detection step and the control target value change step;
• an adjustment reference signal generation step of generating an adjustment reference signal for adjusting the control target value;
• a control target value adjustment step of adjusting the control target value changed in the control target value change step, on the basis of the output from the adjustment reference signal generation step;
• a margin measurement step of obtaining a range of the control target value from its minimum value to its maximum value, said control target value being changed in the control target value change step, within which range the optical disc signal processing device can perform normal operation;
• a condition setting step of setting a threshold value of the adjustment reference signal when measuring the range in the margin measurement step;
• a utilization rate measurement step of measuring the utilization rate of the optical disc signal processing device;
• a storage step of storing the range of the control target value from its minimum value to its maximum value, which is obtained in the margin measurement step, into a nonvolatile memory together with the utilization rate outputted from the utilization rate measurement step;
• a comparison step of comparing the range of the control target value from its minimum value to its maximum value, which is stored in the nonvolatile memory, with the control target value which is adjusted in the control target value adjustment step;
• a number-of-rotations selection step of selecting the number of rotations of the recording medium on the basis of the output from the comparison step;
• a number-of-rotations acquisition step of obtaining the number of rotations of the recording medium;
• and
• a rotation control step of outputting a drive signal for rotating the recording medium with the target number of rotations according to the outputs from the number-of-rotations selection step and the number-of-rotations acquisition step;
• wherein the range of the control target value from its minimum value to its maximum value, which is obtained in the margin measurement step, is stored in the nonvolatile memory together with the utilization rate which is outputted from the utilization rate measurement step and the number of rotations of the recording medium which is outputted from the number-of-rotations acquisition step, and the number-of-rotations of the recording medium is optimized in the number-of-rotations selection step so that the control target value adjusted in the control target value adjustment step is included in the range of the control target value from its minimum value to its maximum value, which is obtained in the margin measurement step and stored in the nonvolatile memory.

An optical disc signal processing device comprising:

• a driving step of changing the physical position or angle of an optical pickup;
• an error detection step of detecting the physical positional relation between the optical pickup and a recording medium from an electric signal generated by the optical pickup;
• a control target value change step of changing a control target value in an optical disc signal processing device;
• a control step of controlling the drive step according to the outputs from the error detection step and the control target value change step;
• an adjustment reference signal generation step of generating an adjustment reference signal for adjusting the control target value;
• a control target value adjustment step of adjusting the control target value changed in the control target value change step, on the basis of the output from the adjustment reference signal generation step;
• a margin measurement step of obtaining a range of the control target value from its minimum value to its maximum value, said control target value being changed in the control target value change step, within which range the optical disc signal processing device can perform normal operation;
• a condition setting step of setting a threshold value of the adjustment reference signal when measuring the range in the margin measurement step;
• a utilization rate measurement step of measuring the utilization rate of the optical disc signal processing device;
• a storage step of storing the range of the control target value from its minimum value to its maximum value, which is obtained in the margin measurement step, into a nonvolatile memory together with the utilization rate outputted from the utilization rate measurement step;
• and
• a maximum utilization rate estimation step of estimating a utilization rate with which the range of the control target value from its minimum value to its maximum value becomes equal to or lower than a threshold value, from the utilization rate of the optical disc signal processing device which is stored in the nonvolatile memory and the range of the control target value from its minimum value to its maximum value, which is obtained in the margin measurement step.

An optical disc signal processing method comprising:

• a driving step of changing the physical position or angle of an optical pickup;
• an error detection step of detecting the physical positional relation between the optical pickup and a recording medium from an electric signal generated by the optical pickup;
• a control target value change step of changing a control target value in an optical disc signal processing device;
• a control step of controlling the drive step according to the outputs from the error detection step and the control target value change step;
• an adjustment reference signal generation step of generating an adjustment reference signal for adjusting the control target value;
• a control target value adjustment step of adjusting the control target value changed in the control target value change step, on the basis of the output from the adjustment reference signal generation step;
• a margin measurement step of obtaining a range of the control target value from its minimum value to its maximum value, said control target value being changed in the control target value change step, within which range the optical disc signal processing device can perform normal operation;
• a condition setting step of setting a threshold value of the adjustment reference signal when measuring the range in the margin measurement step;
• a utilization rate measurement step of measuring the utilization rate of the optical disc signal processing device;
• a storage step of storing the range of the control target value from its minimum value to its maximum value, which is obtained in the margin measurement step, into a nonvolatile memory together with the utilization rate outputted from the utilization rate measurement step;
• a maximum utilization rate estimation step of estimating a utilization rate with which the range of the control target value from its minimum value to its maximum value becomes equal to or lower than a threshold value, from the utilization rate of the optical disc signal processing device which is stored in the nonvolatile memory and the range of the control target value from its minimum value to its maximum value, which is obtained in the margin measurement step;
• and
• a warning output step of outputting a warning message when the output result of the maximum utilization rate estimation step varies exceeding a predetermined threshold value.

An optical disc signal processing method comprising:

• a driving step of changing the physical position or angle of an optical pickup;
• an error detection step of detecting the physical positional relation between the optical pickup and a recording medium from an electric signal generated by the optical pickup;
• a control target value change step of changing a control target value in an optical disc signal processing device;
• a control step of controlling the drive step according to the outputs from the error detection step and the control target value change step;
• an adjustment reference signal generation step of generating an adjustment reference signal for adjusting the control target value;
• a control target value adjustment step of adjusting the control target value changed in the control target value change step, on the basis of the output from the adjustment reference signal generation step;
• a margin measurement step of obtaining a range of the control target value from its minimum value to its maximum value, said control target value being changed in the control target value change step, within which range the optical disc signal processing device can perform normal operation;
• a condition setting step of setting a threshold value of the adjustment reference signal when measuring the range in the margin measurement step;
• a utilization rate measurement step of measuring the utilization rate of the optical disc signal processing device;
• a storage step of storing the range of the control target value from its minimum value to its maximum value, which is obtained in the margin measurement step, into a nonvolatile memory together with the utilization rate outputted from the utilization rate measurement step;
• a program change step of changing a program for managing the respective steps;
• a program comparison step of comparing the identification information of the program for the previous margin measurement which is stored in the nonvolatile memory with the identification information of the changed program;
• and
• a warning output step of comparing, based on the output from the program comparison step, the range of the control target value from its minimum value to its maximum value, with which the optical disc signal processing device can perform normal operation, which range is obtained after the program has been changed in the program change step, with the range of the control target value from its minimum value to its maximum value, which is stored in the nonvolatile memory, and outputting a warning message when the range of the control target value which is obtained after the program change is reduced exceeding a threshold value as compared with the range of the control target value which is stored in the nonvolatile memory.