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7613086 |
Disk device and control method for disk device
A disk device includes: a rotating unit for rotating the optical disk; an optical pick-up for reading the information data recorded on the optical disk; a moving unit for moving the optical...
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7590040 |
Signal detecting method and apparatus and information reproducing apparatus and method
This signal detection method detects an output signal indicating data information contained at least in two sideband waves from an input signal having a carrier and at least two sideband waves...
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7573789 |
Method and apparatus for recording data at accurate location on recording medium
An information recording device includes a buffer memory, a buffer management unit and a phase adjusting unit. The buffer memory temporarily stores data to be written in a recording medium. The...
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7564752 |
Disc signal evaluation apparatus and disc signal evaluation method
By decoding a formatted 1-77PP signal 22 outputted from a BD-ROM formatter 20 at a high speed, comparing it with original data 34 in a comparator unit 30 and checking authenticity of data...
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7558177 |
Optical disc playback apparatus
After a playback RF signal 3 detected from an optical disc medium 1 is waveform-shaped, it is converted into a digital RF signal 6 with a sampling clock 8 having a cycle twice as long as a...
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7539096 |
Disc playback apparatus and method
A disc playback apparatus is configured to reproduce information by demodulating and decoding a radio-frequency signal obtained by receiving reflected light of a beam applied to a recording surface...
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7460446 |
Method and system for generating a feedback signal in optical disc drives
A method for generating a feedback signal in optical disc drives is disclosed. Firstly RF signal is generated by a pickup head and coupled to a converter to generate a digital signal. Then a...
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7428195 |
Information reproduction apparatus and information reproduction method
An information reproduction apparatus and method according to the present invention are provided so as to solve the problem that signal quality is degraded in a normal signal part when always...
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7420905 |
Information reproducing method judging a multivalued level of a present cell by referring to judged multivalued levels of a preceding cell and an ensuing cell
A mark representing information of a multivalued level is recorded in each of cells arranged in a recording medium. Upon reproducing the multivalued level from a reproduction signal of the...
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7372791 |
Recording/reproducing apparatus and cross talk cancel method
The present invention is directed to a recording/reproducing apparatus having a Read After Write function which simultaneously performs recording operation and reproduction operation, and is such...
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7366068 |
Method for recording data to a write once disc
A write once disc allowing management of a data area, a method of managing the data area of the write once disc, an apparatus recording data on the write once disc, an apparatus and method of...
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7330408 |
Equalizer for high density optical disc reproducing apparatus and equalizing method therefor
An equalizer for a high density optical disc reproducing apparatus and an equalizing method therefore are provided. The equalizer includes: a non-linear transformer, which transforms an input...
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7324249 |
Recording and reproducing apparatus having fixed distortion correcting function
A recording and reproducing apparatus includes a reproduction signal detection unit reproducing a two-dimensional pattern previously recorded on a holographic recording medium or user data recorded...
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7304923 |
Disk drive and detection method using pre-pit detection and push-pull signal generation
A push pull signal is detected from a disk-shaped storage medium on which wobbling grooves are formed as recording tracks and address information is recorded by forming pre-pits on lands between...
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7269113 |
Power correction for device for scanning a record carrier
A device for recording and/or reading a record carrier has an optical head with a laser for generating a beam via a scanning spot on a track of the carrier. A detector detects a read signal and a...
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7218583 |
Method for land pre-pit recovery
The present invention relates to a method for recovering land pre-pits from a signal obtained from an optical recording medium. According to the invention, the method comprises the steps of:
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7142498 |
Recorded information reproducing apparatus
It is an object to provide a recorded information reproducing apparatus that allows to eliminate crosstalk from an adjacent track correctly, even from a recording medium having both a recorded area...
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RE39306 |
Optical disc device
An optical disc drive usable with discs to which data is continuously recorded and discs having a sector format can quickly resume playback signal output after passing imperfection causing...
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7095693 |
Optical disc device and control method using preceding sub-beam to detect a disc defect
The invention relates to an optical disc device and a control method for the optical disc device. The presence of defects on an optical disc is confirmed by, based on the result of detecting a...
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7092341 |
Data recording method and data recording medium
The object of the present invention is to provide a data recording method and optic recording medium that is capable of reproducing address data accurately by reducing the correlation of address...
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7082091 |
Information reproducing method judging a multivalued level of a present cell by referring to judged multivalued levels of a preceding cell and an ensuing cell
A mark representing information of a multivalued level is recorded in each of cells arranged in a recording medium. Upon reproducing the multivalued level from a reproduction signal of the...
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7079457 |
Method of reproducing information with equalization coefficient for the reproduced information
A method of reproducing information by scanning information marks, disposed with a predetermined mark pitch therebetween and recorded on tracks inside a predetermined information recording region,...
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7068573 |
Reproducing device and method of removing noise
For reproducing data, a first read signal from a main track is filtered and second read signals from tracks adjacent to the main track are filtered. A cross-modulation component included in a third...
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7057994 |
Apparatus and method for reproducing information from two types of optical disks having discrimination marks formed along tracks thereof
When information is reproduced in an optical disk of high recording density or of low recording density, a main beam and sub-beams are emitted onto adjacent tracks. The main beam has a shape longer...
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7054246 |
Optical disk device adapted for reliably detecting pre-pit information formed on an optical disk
An optical disk device which performs data recording and reproduction with regard to an optical disk on which pre-pit information for specifying an address is formed. An optical disk is irradiated...
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7050371 |
Cross-talk removal apparatus and data reproduction apparatus
A pick up irradiates light beams at specified intervals in the tangential direction of the main track to be reproduced and both of adjacent tracks on a disk 10 on which tracks are formed. A CTC...
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7046595 |
Method of reproducing information with equalization coefficient for the reproduced information
A method of reproducing information by scanning information marks, disposed with a predetermined mark pitch therebetween and recorded on tracks inside a predetermined information recording region,...
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7023769 |
Data recording method, data reproduction method, data recording device, data reproduction device and optical recording medium
A data recording method for calculating a digital sum value (DSV) corresponding to a proportion of positive data and negative data included in predetermined data ranges, selecting a resync pattern...
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7002890 |
High density analog recording using write symbols having distinguishable readout waveforms
A method of recording data on a recording medium includes mapping the data to a set of write symbols wherein each write symbol represents more than one bit of the data. The set of write symbols is...
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6992956 |
Disk reproducing apparatus for precisely determining a value of an address signal reproduced from the disk
A disk reproducing apparatus includes a variable gain amplifier (VCA) ( 32 ), and the VCA applies a radial push-pull signal including an address signal and an FCM leakage-in signal to a switch ( 38...
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6992954 |
Method for determining DC level of AC signal and DC offset of the same
A method for determining a direct current (DC) level involved in an alternating current signal is provided. The alternating current signal is transmitted from an amplifier to an A/D...
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6982937 |
Data reproducing apparatus
Crosstalk cancellation is realized more accurately than ever by considering both magnitude and a phase difference of a crosstalk signal from a recording track adjoining a target track, in...
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6970406 |
Information playback apparatus, signal processing apparatus, and information playback method for detecting and canceling crosstalk
An information playback apparatus of the present invention is provided with: a first detecting unit for supplying a difference between respective output signals optically obtained by a pair of...
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6967911 |
Multivalued information recording method, multivalued information recording apparatus, and recording medium
A multivalued information recording method in which energy applied to information units on a recording medium is varied to record multivalued information. In accordance with a relationship between...
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6947363 |
Superresolution in periodic data storage media
This invention provides a method of acquisition of binary information that has been stored physically in a periodic storage medium. The method, referred to as matrix-method deconvolution (MMD), is...
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6944105 |
Method of reproducing information with equalization for the reproduced information to reduce inter-symbol interference
A method of reproducing information by scanning information marks, disposed with a predetermined mark pitch therebetween and recorded on tracks inside a predetermined information recording region,...
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6917574 |
Data recording and reproducing apparatus and method for linking data using a decreased number of data linking blocks
User data is recorded in a recording medium while being linked in units of a fixed length packet, and information indicative of this fact is written to the recording medium. At the time of reading...
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6870803 |
Information storage apparatus and information reproducing method for reducing cross talk from a region adjacent a recorded information mark
An information storage apparatus includes a mark reading section for reading a mark written on an information storage medium. A recording state changing section is provided for changing a recording...
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6856754 |
Content recording/erasing apparatus
A content recording/erasing apparatus includes a hard disk. An unnecessary MPEG file recorded on the hard disk is intermittently erased part by part in parallel with a normal recording process. It...
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6834031 |
Method of sampling wobble components and disk drive unit executing the method
The method of sampling wobble components of the present invention is capable of realizing a disk drive unit, which can write data at high speed, and reducing manufacturing cost of the disk drive...
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6804182 |
Optical disc reproducing apparatus and semiconductor integrated circuit and therefor
When subcodes included in a CD format are reproduced, jitter is removed when the subcodes are synchronized with signal data. The data is connected together by using the subcode data to prevent...
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6747924 |
Optical disk reproduction apparatus
Prior to actual reproduction of an optical disk, test reproduction is performed with respect to a plurality of testing radial locations of the optical disk. In the test reproduction,...
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6724702 |
Apparatus for reproducing recorded data
In an apparatus for reproducing recorded data, a crosstalk signal is generated by converting adjacent data recorded on an adjacent track into a waveform of said reproduction signal and the crostalk...
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6707775 |
Method and apparatus for measuring crosstalk of optical disc
A method and apparatus for measuring the crosstalk of an optical disc of an optical disc player adapted to reproduce signals recorded on the disc, in which there are concentrically or spirally...
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6694030 |
Apparatus and method for reproducing a digital audio signal from a record carrier
A reproducing apparatus for reproducing an audio signal from a record carrier having a first digital audio signal (a PCM encoded audio signal) recorded on it in a first format and a second digital...
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6693863 |
Asymmetry correcting circuit and information reproducing apparatus using the same
To provide an asymmetry correcting circuit capable of canceling an asymmetry simultaneously with quantization in an ADC and utilizing the dynamic range of the ADC effectively, and also to provide...
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6687204 |
Crosstalk removal apparatus and information reproduction apparatus
There is disclosed a crosstalk removal apparatus in which a main track, one adjacent track, and the other adjacent track in a disk with the tracks formed therein are irradiated with light beams at...
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6680891 |
Apparatus and method for correcting asymmetry in an optical disk reproduction system
In an apparatus and a method for correcting asymmetry in an optical disk reproduction system, an analog RF signal is received from an optical diode and an asymmetry-corrected signal is output as a...
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6674706 |
Information reproducing apparatus and information recording medium
On an information recording medium ( 1 ), digital information is multi-level-recorded by changing a shape of an information pit in correspondence with the digital information by multiple steps. An...
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6643234 |
Optical disk device
An optical disk provided with a land region and a groove region that are formed on a substrate, the land region and groove region being used as a recording track that is the medium of the...
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