Measurement apparatus, reproduction apparatus, and measurement method
AssigneeSony Corporation
InventorSatoru Higashino
Life of this patent
Estimating the term…
Abstract
A measurement apparatus includes a moving average calculation section and a convergence judgment section. The moving average calculation section calculates a moving average by inputting a phase error between a phase of an input signal and a target phase, that is detected by a phase-locked loop circuit. The convergence judgment section judges that the phase-locked loop circuit is not converged when an absolute value of the moving average is equal to or larger than a first threshold value and judges that the phase-locked loop circuit is converged when the absolute value of the moving average is smaller than the first threshold value.
Claims8
A measurement apparatus comprising:
- a moving average calculation means for calculating a moving average by inputting a phase error between a phase of an input signal and a target phase, that is detected by a phase-locked loop circuit;
- and
- a convergence judgment means for judging that the phase-locked loop circuit is not converged when an absolute value of the moving average is larger than or equal to a first threshold value and judging that the phase-locked loop circuit is converged when the absolute value of the moving average is smaller than the first threshold value.
A reproduction apparatus comprising:
- a read-out means for reading out a signal recorded onto an optical disc and outputting a reproduction baseband signal;
- a phase-locked loop circuit to detect a phase error between a phase of the reproduction baseband signal and a target phase, and to control the phase of the reproduction baseband signal to be synchronized with the target phase based at least in part on the detected phase error;
- a moving average calculation means for calculating a moving average by inputting the phase error between the phase of the reproduction baseband signal and the target phase, that is detected by the phase-locked loop circuit;
- and
- a convergence judgment means for judging that the phase-locked loop circuit is not converged when an absolute value of the moving average is larger than or equal to a first threshold value and judging that the phase-locked loop circuit is converged when the absolute value of the moving average is smaller than the first threshold value.
A measurement method comprising the steps of:
- calculating a moving average by inputting a phase error between a phase of an input signal and a target phase, that is detected by a phase-locked loop circuit;
- and
- judging that the phase-locked loop circuit is not converged when an absolute value of the moving average is larger than or equal to a first threshold value and judging that the phase-locked loop circuit is converged when the absolute value of the moving average is smaller than the first threshold value.
A measurement apparatus comprising:
- a moving average calculation section to calculate a moving average by inputting a phase error between a phase of an input signal and a target phase, that is detected by a phase-locked loop circuit;
- and
- a convergence judgment section to judge that the phase-locked loop circuit is not converged when an absolute value of the moving average is larger or equal to than a first threshold value and judge that the phase-locked loop circuit is converged when the absolute value of the moving average is smaller than the first threshold value.
Dependencies are inferred from the claim text.