| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 369470170 | For removal of unwanted signal component | 17 |
| 20100091623 | FREQUENCY CHARACTERISTIC ADJUSTING CIRCUIT, RECEIVING INTERFACE CIRCUIT, AND MAGNETIC STORAGE DEVICE - According to one embodiment, a frequency characteristic adjusting circuit includes a cutoff range adjusting module and a control signal inputting module. The cutoff range adjusting module is connected to an AC coupling circuit capacitively coupled with a signal transmission path, and allows an output signal from the AC coupling circuit to pass through such that a low cutoff range in the frequency characteristic of the AC coupling circuit varies. The control signal inputting module receives a control signal to control a zero-point frequency based on a numerator polynomial of a transfer function of the cutoff range adjusting module and a pole frequency based on a denominator polynomial of the transfer function. The numerator polynomial is equalized to a denominator polynomial of a transfer function of the AC coupling circuit by the control signal. A cutoff frequency is determined by the pole frequency according to the control signal. | 04-15-2010 |
| 20100157757 | SYSTEM AND METHOD FOR STORAGE OF DATA IN CIRCULAR DATA TRACKS ON OPTICAL DISCS - The present techniques provide methods and systems for reading and processing a data signal read from an optical data disc. In embodiments, an optical reader system may read data bits from a data ring in the disc. The data rings may be concentric, and a beginning of a sequence of data on the data ring may be in substantially the same position as an ending of the sequence. The reader may identify a data ring and begin the read process on the targeted data ring, and may end the read process when the reader reaches the starting point. The data sequence read from the data ring may be decoded to form a bit stream, which may be provided to various output devices. A circular trellis formed from the bit stream may enable the reading of a targeted data sequence without additional tail bits to improve data transmission efficiency. | 06-24-2010 |
| 20100165810 | NOISE REMOVING APPARATUS AND METHOD, AND OPTICAL PICKUP - An optical pickup includes: light collecting element for selectively collecting main and sub beams emitted toward an optical disc formed by layering at least first and second recording layers, onto one of first and second recording layers; main and sub light reception elements receiving the main and sub light from the main and sub beams collected from the optical disc and outputting main and sub light signals; tracking error signal generator for generating a tracking error signal according to the sub light signal; noise component calculator for calculating a noise component generated by interference between the sub light and an invalid light attributed to at least one of the applied main and sub beams and received together with the sub light and the sub light from the other of the first and the second recording layer; and noise remover for removing the calculated noise component from the tracking error signal. | 07-01-2010 |
| 20100260022 | LIGHT SPOT POSITION CONTROL APPARATUS AND LIGHT SPOT POSITION CONTROL METHOD - Provided is a light-spot-position control apparatus including: a first-light-source; a second-light-source; a beam-splitter splitting a beam of the second-light-source into m beams; an optical-system allowing a first-beam of the first-light-source and the m beams to irradiate a disk-shaped recording-medium, where grooves and lands are alternately formed with an equal radial width to form the grooves in spiral/concentric shape through common-objective-lens, the optical-system allowing the three beams to irradiate the recording-medium so that an interval of m beam-spots is 1/m of track pitch; a tracking-control-mechanism tracking-controlling the beam by changing a relationship between the optical-axis and the recording-medium; a light-receiving unit individually receiving the m beams; an error-signal generator generating error-signals representing radial-position-errors of the spot-positions of the m beams with respect to the tracks based on received signals; an error-signal selector selecting at least one error-signal; and a servo-controller controlling the tracking-control-mechanism to tracking-servo the beam based on the error-signal. | 10-14-2010 |
| 20110075532 | Optical Disk Device and Optical Disk Discriminating Method - An optical disk discriminating method and an optical disk device which can detect reflected rays for making discrimination among kinds of optical disks with high accuracies. By switching a plurality of lasers and moving a spherical aberration corrector while moving an objective lens to cause it to approach or keep away from an optical disk, rays reflected light from the optical disk can be detected with high accuracies. Discrimination among the kinds of a plurality of optical disks can be made on the basis of signals generated from the detected reflected rays. This ensures that the kind of an optical disk can be determined through one operation of sweeping. | 03-31-2011 |
| 20110075533 | DETECTION OF DATA IN BURST CUTTING AREA OF OPTICAL DISK - An apparatus generates outgoing data (OD) to be provided on an optical disk ( | 03-31-2011 |
| 20110075534 | OPTICAL RECORDING MEDIUM, AND OPTICAL INFORMATION DEVICE - An object of the invention is to provide an optical recording medium and an optical information device that enable to improve the quality of a servo signal and a reproduction signal. In the case where shape-wise thicknesses tr | 03-31-2011 |
| 20110134735 | RECORDING DEVICE AND RECORDING METHOD FOR OPTICAL RECORDING MEDIUM - It is desired that the overshooting and undershooting of optical pulse waveforms of optical pickups included in optical disk devices be reduced to improve the quality of recording. Among pulses to be recorded, the trailing edge of each last pulse and the leading edge of the subsequent erase top pulse are made to almost coincide with each other. Ratio a/b, where a is the difference between erase top pulse power level Pet and erasing power level Pe and b is the difference between recording power level Pw and the erasing power level Pe, is adjusted to realize an optical pulse waveform with reduced overshooting and undershooting for each of different recording media. Erase top pulse duration Tert is switched according to different recording speeds for different recording media. | 06-09-2011 |
| 20110176401 | SYSTEM AND METHOD FOR SUPPRESSING JITTER - A system and method for suppressing jitter in a digital data signal in a signal processor system. The digital data signal has spaced apart byte allocation units wherein such spacing is increased such that unallocated bytes can be identified and removed from the digital data signal. The byte allocation units of the digital data signal are suppressed with a digital data signal being outputted from the signal processor system having suppressed byte allocation units to suppress the occurrence of jitter. | 07-21-2011 |
| 20120275282 | DEVICE AND METHOD FOR REPRODUCING DIGITAL SIGNAL AND DEVICE AND METHOD FOR RECORDING DIGITAL SIGNAL - A technique capable of realizing a power saving in a device for reproducing/recording digital signals by controlling a frequency of a clock. The device for reproducing/recording digital signals includes: a difference comparing circuit for comparing a first parameter updated each time a process for one correcting block is done in a demodulating circuit with a second parameter updated each time a process of one correcting block is done in an error correcting circuit; and a circuit for switching a frequency of a master clock depending on a comparison result of the difference comparing circuit. Thereby, the frequency of the clock can be switched both when the demodulation for one correcting block is ended and when the correcting process for one correcting block is ended by using the switched master clock. | 11-01-2012 |
| 20120320724 | METHOD AND APPARATUS FOR DETERMINING UNBALANCED DISC AND OPTICAL INFORMATION STORAGE MEDIUM SYSTEM USING THE SAME - An unbalanced disc determining apparatus is provided. The unbalanced disc determining apparatus includes a noise reduction unit configured to reduce noise components of a center error signal obtained from a signal configured to detect light reflected by a disc revolved by a spindle motor, and a determination unit configured to determine whether the revolving disc is unbalanced by determining whether the center error signal of which noise is reduced exceeds a reference value. | 12-20-2012 |
| 20130250744 | RECORDING DEVICE AND STRAY LIGHT SIGNAL COMPONENT CANCELLATION METHOD - Provided is a recording device, including a light irradiation/receiving unit that irradiates an optical recording medium with first light and second light, and that receives backpropagating light of the second light from the optical recording medium, a recording unit that carries out recording on the optical recording medium, a playback signal generating unit that obtains a playback signal of a signal, and a stray light signal component canceling unit that generates, based on recording data, a stray light cancel signal for canceling a stray light signal component. | 09-26-2013 |
| 20130301397 | OPTICAL DISK DEVICE - An optical disc device includes an optical pickup that causes a laser beam to be incident on an optical disc and detects a reflected beam, an A/D converter that converts into a digital signal a plurality of analog signals obtained from the reflected beam detected by the optical pickup, an error signal generating circuit that generates a servo signal for the optical pickup based on the digital signal converted by the A/D converter, a low-pass filter that removes noise of a specific band included in the servo error signal generated by the error signal generating circuit, a main processor that switches a noise removal band of the low-pass filter based on states of the optical disc, and an actuator that performs servo control for the optical pickup based on the servo error signal from which the noise has been removed by the low-pass filter. | 11-14-2013 |
| 20140056116 | DECODING METHOD AND DECODING DEVICE - A discrete Fourier transform circuit ( | 02-27-2014 |
| 20140341007 | OPTICAL INFORMATION DEVICE, CROSS-TALK REDUCTION METHOD, COMPUTER, PLAYER, AND RECORDER - A ratio Xm of an information item recorded on an adjacent track relative to an information item recorded on a main track included in a first signal obtained from a first light flux having passed through a center region ( | 11-20-2014 |
| 20150049598 | OPTICAL DISC DEVICE - An optical disc device includes an optical pickup unit which irradiates an optical disc with light and generates a signal according to light reflected from the optical disc, a playback unit which uses the signal to execute playback of the optical disc, and an adjustment unit which executes settings adjustment processing that includes a first adjustment process and a second adjustment process to adjust various settings pertaining to the playback quality of the optical disc. The adjustment unit measures a first evaluation item that serves as an indicator of whether or not it is necessary to execute the first adjustment process and a second evaluation item that serves as an indicator of whether or not it is necessary to execute the second adjustment process, omits execution of the first and second adjustment processes depending on the results of measuring the values of the first and second evaluation items, respectively. | 02-19-2015 |
| 20160125905 | APPARATUS AND METHOD FOR DETECTING A SYMBOL ON A TWO-DIMENSIONAL STORAGE MEDIUM - The invention relates to an apparatus and method for detecting a symbol from a set of readout values from a local neighborhood of a two-dimensional storage medium, comprising: evaluating a joint probability distribution for a given observation and a complete set of data patterns in the local neighborhood; and choosing as detection output a weighted average of the center values of the data patterns, using the values of the associated joint probability distribution as weights; wherein the joint probability distribution is a multi variant Gaussian probability distribution which employs vectorial observations, vectorial averages, and covariance matrixes. | 05-05-2016 |
