Abstract: Deterioration of convergence performance or operational stability due to an increase in constraint length is suppressed when coefficients are updated, so that decoding performance is improved.

Abstract: An image forming apparatus includes a warning mode to issue an alert when a human detection sensor detects a person while the image forming apparatus is in an operation mode. When a central processing unit has received print data from an external device during the warning mode, the central processing unit stores the received print data in a storage device. The central processing unit executes print processing for the stored print data when the warning mode has been released.

Abstract: An operational method of a memory module is provided. The method includes receiving, from an external of the memory module, a first command and a first address in synchronization with clock signals. Status information is output through a signal line, when first data corresponding the first address is available in a data buffer in response to the first command. A second command in synchronization with the clock signals after the transmitting the status information is received from the external of the memory module, a second command. In response to the second command, the first data being available in the data buffer is output through data lines.

Abstract: An ophthalmological imaging device comprising an objective lens, an interference optical system, an image forming unit, an optical member, and an analyzer. The interference optical system divides light from a light source into measurement light and reference light, causes the measurement light to become incident on a subject's eye via the objective lens, and detects interference light between the reference light and return light of the measurement light that has exited from the subject's eye and passed through the objective lens. The image forming unit forms an image of the subject's eye based on a detection result of the interference light which are acquired by the interference optical system. The analyzer analyzes a first detection result and a second detection result of the interference light to eliminate noise in the second detection result or in an image based on the second detection result.

Abstract: Provided is a measuring apparatus which includes an imaging device configured to image an object to obtain image data and a processor configured to process the image data to recognize a region of the object. The processor is configured to perform feature extraction on the image data to obtain first feature data, perform projection of a three-dimensional model of the object, whose region is recognized based on the image data, onto a predetermined surface and perform the feature extraction on image data obtained by the projection to obtain second feature data, and perform determination of whether there is an unrecognized object based on the first feature data and the second feature data.

Abstract: A focus control apparatus and method capable of generating a focus position signal according to focus position error even in proximity to an interface between regions having different thicknesses, to perform a high precision focus position control using the focus position signal, are provided. A focus control apparatus includes an error signal correction portion configured to process a focus error signal that indicates an error of a focus position of an optical system with respect to an object. Moreover, the focus control apparatus includes a region conversion detection portion configured to output a region signal that corresponds to a first region or a second region of the object. The first and second regions of the object have different respective heights.

Abstract: A data storage device is disclosed wherein a first 2D data dependent noise whitening (DDNW) filter is configured to perform 2D DDNW of first and second 2D equalized samples to generate first 2D noise whitened samples. A second 2D DDNW filter is configured to perform 2D DDNW of the first and second 2D equalized samples to generate second 2D noise whitened samples. A 2D sequence detector is configured to detect a first data sequence recorded in a first data track from the first and second 2D noise whitened samples and to detect a second data sequence recorded in a second data track from the first and second 2D noise whitened samples.

Abstract: According to one embodiment, an equalizer is configured to obtain a noise included in a first correction signal by using a noise component of a first track and a noise interference component from a second track. The equalizer is configured to correct the first correction signal by using the obtained noise. The equalizer is configured to equalize the corrected first correction signal. The noise component of the first track is calculated based on a noise component of the first track at a first timing and a noise component of the first track at a second timing earlier than the first timing. The noise interference component from the second track is calculated based on a noise interference component from the second track at the first timing and a noise interference component from the second track at the second timing. The decoder is configured to decode the equalized first correction signal.

Abstract: In an optical information recording device and optical information recording method for angularly multiplexing and recording data on pages on the same recording region on a hologram disk, data on each page is sequentially generated by sequentially dividing input data in predetermined units, the pages to be recorded on the same recording region are divided into page groups so that pages to be recorded adjacently by the angular multiplexing may not belong to the same group, each page group is individually subjected to inter-page coding processing for computing an error-correcting code and adding the computed error-correcting code, and data on the pages subjected to the inter-page coding processing is angularly multiplexed and recorded on the hologram disk.

Abstract: Aspects of the disclosure provide a signal processing circuit that has fast response time to sudden profile changes in an electrical signal. The signal processing circuit includes a processing path configured to process an electrical signal that is generated in response to reading data on a storage medium, and a feed-forward correction module. The feed-forward correction module is configured to detect a profile variation based the electrical signal in a time window, and correct the electrical signal in the time window based on the detected profile variation.

Abstract: 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.

Abstract: New and useful methods and systems for detecting sync signals/patterns in streams of data are disclosed. For example, in an embodiment system for processing data includes a first module having dedicated processing circuitry configured to detect a sync signal embedded in a received stream of data and to produce an output stream of data, and second module that includes a firmware-controlled processor configured to correct sufficient errors within the received stream of data so as to allow the first module to detect the sync signal on a condition when the first module by itself is incapable of resolving the sync signal caused by the errors in the received stream of data.

Abstract: A data storage device is disclosed comprising a head actuated over a disk. A read signal from the head is sampled to generate signal samples, and the signal samples are filtered with an equalizer filter to generate equalized samples. The equalized samples are filtered with an inter-track interference (ITI) filter to generate ITI attenuated samples, and a data sequence is detected based on the ITI attenuated samples. In one embodiment, the ITI filter comprises a transfer function: 1?HPF(ek) and in another embodiment the ITI filter comprises a transfer function: 1?LPF(ek) where ek represents a noise sequence in the equalized samples, HPF represents a high pass filter operating on ek, and LPF represents a low pass filter operating on ek.

Abstract: Provided is an optical disc device capable of correcting a value of a control parameter during an operation of reading information from an optical disc medium. The optical disc device for reading the information recorded on the optical disc medium under an operation condition corresponding to a value set with respect to a predetermined control parameter corrects the value of the predetermined control parameter by repeatedly executing, while an operation of reading the information from the optical disc medium is being performed, processing of: acquiring, with respect to two values of the predetermined control parameter, evaluation values indicating accuracy of the reading of the information from the optical disc medium, respectively; and updating the value of the predetermined control parameter based on the two acquired evaluation values.

Abstract: A data detecting device includes a multi-input adaptive equalizer, a binarizing unit, and an equalization error calculating unit. The multi-input adaptive equalizer includes a plurality of adaptive equalizers and outputs a reproduction information signal from a target track and a reproduction information signal from a close track close to the target track as equalization signals by calculating outputs of the adaptive equalizers, the reproduction information signals being input to the adaptive equalizers, respectively as reproduction information signals. The binarizing unit obtains binarized data by performing a binarization process on the equalization signals.

Abstract: A data storage and retrieval system includes a head carriage unit adapted for rotational motion and having multiple heads disposed at a working surface. The system also includes a tape drive unit configured to move a tape media past the working surface of the head carriage unit, the tape media having a width approximately equal to a width of the working surface. As the head carriage unit rotates and the tape moves past the working surface, a first head is configured to write a data track to the tape and a second head is configured to thereafter read the data track, where data read by the second head is for use in verifying data integrity and performing error correction.

Abstract: An information reproducing apparatus includes a photodetector (200A) divided by a dividing line parallel to a recording track scanning direction into a first light-receiving section (202, 203) that receives reflected light of a center section of a recording track and a second light-receiving section (201, 204) that receives reflected light of a portion adjacent, in a radial direction of an optical disc, with respect to the center section, a first adaptive equalization filter (107) that performs waveform equalization of an output signal from the first light-receiving section (202, 203), a second adaptive equalization filter (120) that performs waveform equalization of an output signal from the second light-receiving section (201, 204), and a data decoder (108) that decodes reproduction data based on an output waveform from the first adaptive equalization filter (107) and an output waveform from the second adaptive equalization filter (120).

Abstract: An optical disc library apparatus, on which and plural optical discs and plural optical drives are mounted, has the ability to reduce the degradation of recording/reproduction capability owing to the variation of temperature. In the optical disc library apparatus, causes for the quality degradation of the optical discs are analyzed; temperature inside the optical disc library apparatus is measured in order to make recoveries in accordance with the causes; an inspection cycle for inspecting the optical discs is determined on the basis of the measured temperature; and the inspection of recording qualities of optical discs on which data have already been recorded and that are stored in the optical disc library apparatus is performed by the optical drives on the basis of the measured temperature.

Abstract: Aspects of the disclosure provide a signal processing circuit. The signal processing circuit includes a processing path and a zero-start module. The processing path is configured to process an electrical signal that is generated in response to reading data on a storage medium. The data includes at least a first field and a second field. The electrical signal has a first profile corresponding to the first field and has a second profile corresponding to the second field. The zero-start module is configured to detect a field change from the first field to the second field, and control the processing path to add a compensation as a function of a profile change from the first profile to the second profile to keep the processed electrical signal to have a predetermined profile in response to the detected field change.

Abstract: The present invention is related to systems and methods for adaptive parameter modification in a data processing system.

Abstract: New and useful methods and systems for detecting sync signals/patterns in streams of data are disclosed. For example, in an embodiment system for processing data includes a first module having dedicated processing circuitry configured to detect a sync signal embedded in a received stream of data and to produce an output stream of data, and second module that includes a firmware-controlled processor configured to correct sufficient errors within the received stream of data so as to allow the first module to detect the sync signal on a condition when the first module by itself is incapable of resolving the sync signal caused by the errors in the received stream of data.

Abstract: An information recording and reproducing device has a recording section, a reproducing section, and a deterioration detection processor which detects deterioration of a signal quality of information recorded in a recording medium.

Abstract: An information recording medium in which bottoms of a guide groove and a pit array formed on a disc substrate are allocated on a same flat plane and shaped in flat. Further, in a transition area from a pit array to a guide groove or from a guide groove to a pit array, the information recording medium is provided with an intermediate area composed of a pit array of which height changes from a height between a bottom and a side of a groove to another height between the bottom and a side of the pit array.

Abstract: A test method includes the steps of providing a test optical disc stored data that is reproduced to display a plurality of images having a plurality of single colors, the plurality of single colors comprising a plurality of first single colors; providing a first timer that begins counting for a first predetermined time when the disc player begins to read the test optical disc; displaying test images according to the video signals generated by the disc player that read the test optical disc. The test method further includes the steps of detecting the color of the test images, determining whether the currently detected color is substantially the same as one of the first single colors after the first timer has timed out; determining that the read performance of the disc player is unsatisfactory if the currently detected color is substantially the same as one of first single colors.

Abstract: A data storage and retrieval system includes a head carriage unit adapted for rotational motion and having multiple heads disposed at a working surface. The system also includes a tape drive unit configured to move a tape media past the working surface of the head carriage unit, the tape media having a width approximately equal to a width of the working surface. As the head carriage unit rotates and the tape moves past the working surface, a first head is configured to write a data track to the tape and a second head is configured to thereafter read the data track, where data read by the second head is for use in verifying data integrity and performing error correction.

Abstract: According to one embodiment, there is provided a controller including an interference cancelling module, a boosting module, and a decoding module. The interference cancelling module generates a first correction signal by cancelling an interference component from an adjacent track in a signal read from a target track of a disk medium. The boosting module generates a second correction signal by boosting a low frequency component of a signal corresponding to the first correction signal. The decoding module decodes a signal based on the second correction signal.

Abstract: An information recording and reproducing device has a recording section, a reproducing section, and a deterioration detection processor which detects deterioration of a signal quality of information recorded in a recording medium.

Abstract: Devices, methods, and other embodiments associated with adjusting a defect threshold are described. In one embodiment, an apparatus includes defect detection logic and threshold adjustment logic. The defect detection logic determines, by using a defect threshold, if a read channel has read data from a defective portion of an optical disc. The threshold adjustment logic adjusts the defect threshold based, at least in part, on a gain value of a gain loop associated with the read channel.

Abstract: In one embodiment, the optical read/write apparatus includes a plurality of optical pickups arranged to cross tracks of an optical storage medium and a control section. On finding the data that has been written by any of those optical pickups inaccurate or on detecting any defect at a location where data is going to be written by any of the optical pickups, the control section instructs another one of the optical pickups to write that data on a different track from a track on which the data should have been written.

Abstract: An information recording medium in which bottoms of a guide groove and a pit array formed on a disc substrate are allocated on a same flat plane and shaped in flat. Further, in a transition area from a pit array to a guide groove or from a guide groove to a pit array, the information recording medium is provided with an intermediate area composed of a pit array of which height changes from a height between a bottom and a side of a groove to another height between the bottom and a side of the pit array.

Abstract: This invention allows super-resolution reproduction with which a better bER value is attainable, when information is recorded by a random pattern including a mark length not longer than a resolution limit, by use of a highly versatile signal decoding method. Information is recorded as marks and spaces coded by RLL(1,7) modulation, which each of the marks and spaces have one of a plurality of lengths, and 2T marks and 2T spaces of the marks and spaces being formed are shorter than 0.12 ?m. An information recording layer (20) includes a reproduction film (21) and a reflective film (22) which are provided in this order from a side from which reproducing light is incident, which reproduction film is made of (i) zinc oxide, (ii) strontium titanate, (iii) titanium oxide, (iv) cerium oxide, or (v) a material including at least one of the (i) through (iv), and which reflective film is made of tantalum or titanium.

Abstract: Aspects of the disclosure provide a signal processing circuit that has fast response time to sudden profile changes in an electrical signal. The signal processing circuit includes a processing path configured to process an electrical signal that is generated in response to reading data on a storage medium, and a feed-forward correction module. The feed-forward correction module is configured to detect a profile variation based the electrical signal in a time window, and correct the electrical signal in the time window based on the detected profile variation.

Abstract: In an optical information recording device and optical information recording method for angularly multiplexing and recording data on pages on the same recording region on a hologram disk, data on each page is sequentially generated by sequentially dividing input data in predetermined units, the pages to be recorded on the same recording region are divided into page groups so that pages to be recorded adjacently by the angular multiplexing may not belong to the same group, each page group is individually subjected to inter-page coding processing for computing an error-correcting code and adding the computed error-correcting code, and data on the pages subjected to the inter-page coding processing is angularly multiplexed and recorded on the hologram disk.

Abstract: An optical read/write apparatus as an embodiment of the present invention includes: a light-splitting element configured to split a light beam emitted from a light source into multiple light beams including a write beam and a read beam; an optical system configured to converge the write and read beams onto the same track on an optical storage medium; a photodetector including a light receiving element configured to detect the read beam reflected from the optical storage medium and output an electrical signal; and a divider configured to generate a read signal by dividing the signal detected by the light receiving element by a signal that represents a write modulated component and that is obtained by detecting a part of the light beam emitted from the light source.

Abstract: A test method includes the steps of providing a test optical disc stored data that is reproduced to display a plurality of images having a plurality of single colors, the plurality of single colors comprising a plurality of first single colors; providing a first timer that begins counting for a first predetermined time when the disc player begins to read the test optical disc; displaying test images according to the video signals generated by the disc player that read the test optical disc. The test method further includes the steps of detecting the color of the test images, determining whether the currently detected color is substantially the same as one of the first single colors after the first timer has timed out; determining that the read performance of the disc player is unsatisfactory if the currently detected color is substantially the same as one of first single colors.

Abstract: In a small-sized optical pickup device for enabling to obtain a stable servo-signal, as well as, a focus error signal and a tracking error signal, without receiving ill influences of stray lights from other layers, when recording/reproducing a multi-layer optical disc, a reflection light from the multi-layer optical disc is divided into plural numbers of regions by a diffraction grating. And, it is divided into at least four (4) regions, by a division line in the tangential direction of the optical disc and a division line in the radial direction thereof. Light receiving parts, for detecting either one of grating diffraction lights, i.e.

Abstract: An optical pickup and an information storage medium system using the same. The optical pickup includes a light source that emits light having a plurality of different wavelengths. The optical pickup includes a diffraction device having a plurality of diffraction patterns corresponding to the plurality of different wavelengths to divide the light incident from the light source unit into main light and sub light. The optical pickup further includes a photo-detector having a first main light reception unit that receives the main light and a first sub light reception unit that receives the sub light so as to detect an information signal and/or an error signal by receiving reflected light. The first sub light reception unit of the photo-detector is shaped so as to reduce reception of noise sub light due to diffraction based on an undesired diffraction pattern of sub light generated the diffraction device.

Abstract: A recording and/or reproducing method, a recording and/or reproducing apparatus, and a computer readable recording medium storing a program for performing the method. A recording unit block in which invalid data is partially padded is written on an information storage medium along with padding information indicating that the invalid data is included in the recording unit block. The padding information is useful in determining whether the recording unit block includes the padding data. Accordingly, unnecessary retrial processes of a drive system are reduced such that the performance of the drive system is improved and error correction capability is enhanced.

Abstract: A method of operating a disk drive comprises scanning each Logical Block Address (LBA) of the disk drive to detect a read error or reading the LBA from a media defect list. The LBA may then be converted to a corresponding physical location on the media and a scan of the corresponding physical location and of nearby physical locations that are within a proximity threshold of the corresponding physical locations may be performed to find media defects. Based thereon, it may then be determined whether a media scratch is present and at least one or more data sectors associated with the media scratch may be relocated to a spare location on the media if the media scratch is determined to be present. If the media scratch is determined not to be present, only the data sector associated with the corresponding physical location may be relocated to the spare location.

Abstract: A focus servo control device includes a first detector, first controller, second detector, and second controller. The first detector detects a first focus error signal. The first controller controls the objective lens based on the first focus error signal, so that a focal point of the first laser agrees with the guide layer. The second detector detects a second focus error signal. The second controller changes a relative distance between the focal point of the second laser and the focal point of the first laser, so that the focal point of the second laser agrees with a target recording/reproducing layer.

Abstract: A method for servoing when reading out a recorded holographic disk or recording in a preformatted disk includes detecting a primary signal of a reflected primary beam from a target data track of a target data layer of the disk, wherein the primary beam of radiation has a first wavelength; comparing a power measurement of the primary signal with a threshold value of power; detecting a tracking signal of a reflected tracking beam from a reference layer of the disk in an event that the power measurement of the primary signal is below the threshold value, wherein the tracking beam of radiation has a second wavelength; generating a servo error signal based upon the primary signal or the tracking signal; actuating an optical sub-system based upon either of the primary servo error signal or the tracking servo error signal such that the primary beam focuses on the target data layer.

Abstract: A disk recording medium which can implement a recording method having a high degree of reliability for additional information is disclosed. The disk recording medium has a recording and reproduction region into and from which first data can be recorded and reproduced in accordance with a rewritable or write-once-read-many recording method and from which second data recorded in the form of wobbling of a groove can be reproduced. The second data includes address information and additional information. The additional information of the second data is coded in accordance with a first error correction method, and the coded additional information and the address information are recorded in a state coded in accordance with a second error correction method.

Abstract: There is a need to prevent a possible erroneous detection of an off-track condition during recording to an optical disk. The above need can be addressed by, for example, determining an off-track condition has occurred when a light spot is located at least half-way from the track being recorded toward another track adjacent the track being recorded, and stopping a recording operation. In another example, the above need can be addressed by determining that off-track has occurred based on an output of a first off-track detector which detects that the light spot is off the track based on a wobble signal, an output of a second off-track detector which detects that the light spot is off the track based on a tracking error signal, and an output of a zero-cross detector which detects that the tracking error signal crosses zero based on an output of the tracking error signal.

Abstract: An optical disk inspecting apparatus 10 plays an optical disk at a high speed and determines, based on error information provided during the high-speed reproduction, whether or not errors of a number exceeding a first threshold value have occurred. Then, when it is determined that errors of a number exceeding a first threshold value have occurred, the optical disk inspecting apparatus 10 performs high-speed principal determination of executing high-speed reproduction in this segment and determining presence or absence of errors of a number exceeding a second threshold value and also performs low-speed principal determination of executing low-speed reproduction in this segment and determining presence or absence of errors of a number exceeding the second threshold value. When errors of a number exceeding the second threshold value are detected, it is determined that there is a defect, and NG is outputted.

Abstract: Aspects of the disclosure provide an apparatus. The apparatus includes a pick-up unit, such as an optical pick-up unit, a wobble channel and a defect detector. The pick-up unit generates a push-pull signal corresponding to a wobbled track of a storage medium. The wobble channel includes circuits to receive the push-pull signal, obtain a wobble signal from the push-pull signal, and calculate a wobble amplitude metric based on the wobble signal. The defect detector compares the wobble amplitude metric to a threshold to detect wobble defects.

Abstract: A reproduction signal evaluation method evaluates the quality of a reproduction signal reproduced from an information recording medium based on a binary signal generated from the reproduction signal using a PRML signal processing system. A pattern extraction step extracts, from the binary signal, a specific state transition pattern which has the possibility of causing a bit error; a step computes a differential metric based on the binary signal; an extraction step extracts the differential metric which is not greater than a predetermined signal processing threshold; a step determines a mean value of the differential metrics which are not greater than the signal processing threshold and extracted in the extraction step; a standard deviation computing step determines a standard deviation which corresponds to an error rate predicted from the mean value; and an evaluation step evaluates a quality of the reproduction signal using the standard deviation.

Abstract: An information recording medium in which bottoms of a guide groove and a pit array formed on a disc substrate are allocated on a same flat plane and shaped in flat. Further, in a transition area from a pit array to a guide groove or from a guide groove to a pit array, the information recording medium is provided with an intermediate area composed of a pit array of which height changes from a height between a bottom and a side of a groove to another height between the bottom and a side of the pit array.

Abstract: A recording/reproduction device according to the present invention includes a recording/reproduction section for recording or reproducing data on or from an information recording medium; a verification section for checking whether or not the data recorded on the information recording medium can be reproduced normally; a management information recording section for recording, on the information recording medium by use of the recording/reproduction section, only management information which needs to be changed among a plurality of types of management information for managing the data recorded on the information recording medium; and a management information checking section for checking, by use of the verification section, whether or not latest management information including management information which does not need to be changed and is to be reused can be reproduced normally.

Abstract: 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.

Abstract: Systems and methods for data storage on an optical medium having a plurality of tracks include splitting a light beam into a higher power main beam and at least one lower power side beam that form corresponding spots spaced along a selected one of the plurality of tracks and selectively positioning and aligning the beams/spots along the selected one of the plurality of tracks using the higher power main beam to write data while reading previously written data using the at least one lower power side beam. The systems and methods may include correlating the read signal with a time-shifted write signal to provide a direct read after write capability to verify data written to the optical medium. In one embodiment, an optical tape drive includes an optical pickup unit (OPU) that generates a lower power satellite beam to read data directly after writing by a higher power main beam.