| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 369530340 | Time based parameter | 11 |
| 20080298194 | Optical disc apparatus and data recording method thereof - In order to ensure recording quality while suppressing the adverse effects due to performance variations among apparatuses and disc radial positions on an optical disc, an optical disc apparatus according to the present invention performs, at the time of data recording, the steps of: acquiring a jitter value and β value from a reproduced signal based on laser light reflected from the optical disc in relation to a disc radial position; learning a β value when the acquired jitter value is a minimum as a target β value; and, if a jitter value acquired thereafter is larger than the minimum jitter value by a preset reference value or above, correcting recording power based on the magnitude relation and the difference between the β value associated with the acquired jitter value and the target β value or performing trial record processing. | 12-04-2008 |
| 20090097373 | Jitter Counter And Optical Disc Apparatus Using Same - A jitter counter according to the present invention is connected to a PLL circuit for generating a clock signal, which is necessary for signal processing, from a binary signal, and counts jitters of the binary signal. The jitter counter comprises: a determination signal generation circuit which uses an output signal from a VCO constituting the PLL circuit and the like to generate a determination signal that has a given pulse width having the phase center at the position of a pulse edge of the clock signal; a phase determination circuit which at every time when logic inversion of the binary signal occurs, determines whether or not the inversion position is present in a determination section given by the pulse width of the determination signal based on an output signal from a phase comparator constituting the PLL circuit and on the determination signal; a phase counter which counts the number of times that inversion positions of the binary signal are not present in the determination section (or times that inversion positions of the binary signal are present in the determination section) based on an output signal from the phase determination circuit, wherein a count value of the phase counter is output as a jitter count value. | 04-16-2009 |
| 20090279405 | OPTICAL DISC DRIVE, OPTICAL STORAGE MEDIUM, OPTICAL STORAGE MEDIUM INSPECTION APPARATUS, AND OPTICAL STORAGE MEDIUM INSPECTION METHOD - An optical disc drive having an optical pickup head emitting a light beam to an optical storage medium, detecting the light beam reflected from the optical storage medium, and outputting a signal based on the received reflected light, having a jitter measuring unit measuring jitter in signals output from the optical pickup head and having an evaluation unit determining from the measured jitter if the optical storage medium is good or defective. The jitter measuring unit measures jitter in a train of 3T or longer marks or spaces from an optical storage medium to which digital information is recorded as a train of marks or spaces of length kT based on a period T and an integer k of two or more. | 11-12-2009 |
| 20100027398 | OPTICAL DISC DEVICE AND RECORDING DEVIATION AMOUNT TRANSFER METHOD - There is provided an optical disc device which can evaluate in a short time as to whether an optical disc is recorded with satisfying the standard or not. | 02-04-2010 |
| 20100067341 | Address detection circuit and address detection method - An address detection circuit includes a correction signal generator that generates a plurality of timing correction signals based on an ADIP (Address In Pre-groove) signal that is read out from a wobble of an optical disk, the timing correction signals having different cycles with each other, a correction signal selector that selects one of the timing correction signals generated by the correction signal generator and outputs the selected signal, and a timing corrector that outputs a data address detected based on a data signal that is read out from a data track of the optical disk at a timing in accordance with the timing correction signal transmitted from the correction signal selector. | 03-18-2010 |
| 20100149940 | CLOCK SIGNAL GENERATION DEVICE - A clock signal generator according to the present invention includes: a wobble phase error detecting section for detecting a wobble phase error that is a difference in phase between a wobble signal, representing a wobbled shape of a track on an optical disk medium, and a clock signal; a data phase error detecting section for detecting a data phase error that is a difference in phase between a data signal, representing data that has been written on the optical disk medium, and the clock signal; a frequency control section for generating a frequency control signal to control the frequency of the clock signal based on the wobble phase error and the data phase error; and a clock oscillation section for generating the clock signal with its frequency controlled in accordance with the frequency control signal. | 06-17-2010 |
| 20100182886 | OPTICAL DISC DEVICE AND RECORDING CONDITION SETTING METHOD - The present invention is aimed at providing an optical disc device and a recording condition setting method which can automatically determine an optical recording condition to an optical disc, and the optical disc device comprises an optical pickup which records data on a disc; a data encoder which modulates data to be recorded; a recording timing setting means which sets a timing of recording the data on the disc; a phase error detection means which measures an error amount of a mark recorded on the disc from a position where the mark should be properly located; an error convergence means which calculates error information indicating an optimum position of the mark; a recording timing calculation means which calculates a correction value of the recording timing to be set on the recording timing setting means, based on the error information; and a control means which feedbacks an output of the recording timing calculation means to the recording timing setting means, thereby to optimize the recording timing. | 07-22-2010 |
| 20100226230 | RECORDING DEVICE AND METHOD, AND COMPUTER PROGRAM, AND RECORDING MEDIUM - A recording apparatus includes: a first strategy calculating device (SCD) for calculating a first optimum strategy allowing jitter recorded at a first speed to satisfy a desired condition by adjusting a first standard strategy; a second SCD for calculating a second standard strategy at a second speed by performing clock cycle conversion according to a difference between the first and second speeds on the first standard strategy; a second power calculating device for calculating a second optimum power used at the second speed; a third SCD for calculating a second optimum strategy allowing jitter recorded at the second speed to satisfy a desired condition, by adjusting the second standard strategy; and a fourth SCD for calculating a third optimum strategy at a third speed, based on each of a difference between the first standard and optimum strategies and a difference between the second standard and optimum strategies. | 09-09-2010 |
| 20110085430 | OPTICAL DISC DRIVE, OPTICAL STORAGE MEDIUM, OPTICAL STORAGE MEDIUM INSPECTION APPARATUS, AND OPTICAL STORAGE MEDIUM INSPECTION METHOD - An optical disc drive having an optical pickup head emitting a light beam to an optical storage medium, detecting the light beam reflected from the optical storage medium, and outputting a signal based on the received reflected light, having a jitter measuring unit measuring jitter in signals output from the optical pickup head and having an evaluation unit determining from the measured jitter if the optical storage medium is good or defective. The jitter measuring unit measures jitter in a train of 3T or longer marks or spaces from an optical storage medium to which digital information is recorded as a train of marks or spaces of length kT based on a period T and an integer k of two or more. | 04-14-2011 |
| 20120236699 | OPTICAL DISC RECORDING AND REPRODUCING SEMICONDUCTOR INTEGRATED CIRCUIT AND OPERATING METHOD THEREOF - A semiconductor integrated circuit is equipped with a reproduction ECC circuit, a recording ECC circuit, a host interface circuit, and a memory control circuit. The memory control circuit includes an arbitration circuit and a count circuit. The arbitration circuit arbitrates ECC access with a priority order higher than the access of a host interface with a host apparatus. The count circuit counts the number of output times of the ECC request, and, when the count reaches a prescribed number, the count circuit generates a count termination signal. The arbitration circuit performs switching of priority orders to arbitrate the host with a priority order higher than that of ECC. The prescribed number corresponds to number of output times of the ECC access request necessary for accessing a semiconductor memory in relation to data of one ECC block or of an integral multiple of the one ECC block. | 09-20-2012 |
| 20140043950 | SIGNAL PROCESSING DEVICE, SIGNAL PROCESSING METHOD, AND OPTICAL DISC APPARATUS - Provided is a signal processing device including: an adaptive filter; a PRML circuit for sequentially generating binarized data from a filtered reproduced waveform by sampling at sampling points in a period based on a clock signal and sequentially generating a partial response waveform which is to be the target waveform from the binarized data; a calculating unit for sequentially calculating first phase errors from a difference between the target waveform and the filtered reproduced waveform; a limiting unit for outputting second phase errors by excluding a specific phase error from the first phase errors; and a clock generating unit for generating the clock signal of a frequency corresponding to the second phase errors; wherein the specific phase error includes a phase error at a time when the partial response waveform reaches a specific level which excludes at least a level not less than a predetermined amplitude level. | 02-13-2014 |
