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8164994 |
Apparatus for generating tracking signal
A tracking signal generating apparatus includes a phase detector and a digital phase controller. The phase detector generates an up signal and a down signal which contain information regarding a...
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8130607 |
Method and apparatus for detecting burst cutting area on optical disc
An apparatus for detecting burst cutting areas on optical discs includes an optical pickup head, a front-end processing unit, a sync pattern detector, a channel clock recovery device, and a data...
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8102743 |
PLL circuit, recording apparatus, and clock-signal generating method
A phase-locked loop circuit that generates a clock signal synchronized with an input signal with a predetermined frequency, including an oscillator configured to oscillate and generate the clock...
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8085637 |
Tracking error signal detection apparatus and optical disc apparatus
A DPD tracking error signal detection apparatus includes the following. Four differentiators remove DC components and differentiate four signal with varying differential phases. The signals are...
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8085633 |
Optical disc drive
When a multilayered optical disc is used, the signal-to-noise ratio of a read signal is decreased as effective reflectance is extremely low due to the influence of reflection and absorption by...
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8064310 |
Optical disk recording device which detects pre-pit distribution and shifts recording position accordingly
An optical disk recording device that detects a shift of the recording position with respect to an optical disk, has a pre-pit distribution detecting circuit that detects the distribution of...
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8031573 |
Supplementary timing recovery
Aspects of the disclosure provide a signal processing circuit to reconstruct data from an analog signal. The signal processing circuit includes an analog to digital converter (ADC), an equalizer, a...
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RE42786 |
Optical recording method and optical recording medium
An optical recording method for recording mark length-modulated information on a recording medium by using a plurality of recording mark lengths. The optical recording method comprises the steps...
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8004957 |
Recording and reproducing method and recording and reproducing apparatus
A recording and reproducing method has a recording pulse generating step of generating a recording pulse to set timing of a beam emitted from a laser according to data to be recorded on an...
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7983137 |
Method and apparatus for processing optical disc signal
According to the present invention, whether recoding pits are larger or smaller than diffraction limit is determined. Then, a signal process suitable for processing of the recording pits larger...
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7965597 |
Method and apparatus for recording
Aspects of the disclosure provide a method for recording. The method includes receiving a tracking signal corresponding to a recording track on a storage medium, phase-locking an internal signal to...
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7940615 |
Single PLL demodulation of pre-formatted information embedded in optical recording medium
A method and apparatus demodulate pre-formatted information embedded in an optical recording medium. The demodulation includes (a) receiving a wobble signal representing data symbols...
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7911909 |
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...
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7885160 |
Method of recording information on and reproducing information from optical disk and apparatus for the same
There is provided an information recording and reproducing method and an apparatus for the same capable of optimizing the shift adjustment of a recording pulse recorded in an optical disk even at...
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7848201 |
Information recording apparatus that can achieve uniform signal characteristics and overwriting characteristics over an entire surface of an optical disk medium
In an information recording method and apparatus, when performing recording by using multiple pulses defined by erase powers Pe1 and Pe2 for forming a space part between mark parts, the set values...
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7839748 |
Information reproducing apparatus and method
There is provided an optical information recording/reproducing apparatus capable of obtaining a high super-resolution effect using an optical information recording medium in which a...
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RE41881 |
Re-writable optical disk having reference clock information permanently formed on the disk
An optical disk structure and optical disk recorder which enables data to be rewritten onto the recording layer of the optical disk. A clock reference structure is permanently formed along servo...
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7817511 |
Phase difference detection circuit, phase difference detecting method, optical disk drive, and optical disk drive controlling method
An embodiment of the present invention provides a phase difference detection circuit for detecting a phase difference between input data and an input clock generated based on the input data,...
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7817512 |
Method and apparatus to correct wobble phase slip in optical recorders
The present disclosure can provide a method and an apparatus to correct wobble phase slip in an optical disc recording system during recording. The method of correcting a phase slip can include...
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7808874 |
Optical information reproducing method
An optical information reproducing method of reproducing multivalued information recorded on a track of an optical information medium having a recording/reproducing region, which has virtual cells...
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7808873 |
Optical information reproducing method
An optical information reproducing method of reproducing multivalued information recorded on a track of an optical information medium having a recording/reproducing region, which has virtual cells...
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7764749 |
Phase tracking for received signals using adaptive interpolation
Phase trackers (7) for tracking phases of received data are provided with interpolators (20), error detectors (21,22), combiners (25) and indicator generators (26) for generating at least two...
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7738338 |
Optical information reproducing method
An optical information reproducing method of reproducing multivalued information recorded on a track of an optical information medium having a recording/reproducing region, which has virtual cells...
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7630286 |
Digital PLL circuit and optical disk apparatus having digital PLL circuit
An optical disk apparatus includes a binarizing circuit part for outputting a reference digital signal, and a digital PLL circuit part for outputting a write timing signal based on the reference...
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7525887 |
Playback signal processing apparatus and optical disc device
When generating a sampling clock of an A/D converter for digitizing a playback signal from an optical disc, an over sampling clock generated by a PLL is used. Further, zerocross position...
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7518963 |
Phase difference detection circuit and optical disk device
A phase difference detection circuit that is formed by digital circuits having a small circuit area. In the phase difference detection circuit, the circuits for generating a tracking error signal...
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7512051 |
Information processing apparatus
An information processing apparatus capable of reducing propagation delay differences and error factors, capable of realizing high precision binarization control, and accordingly capable of...
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7471599 |
Write signal control circuit in an optical disk drive
A write signal control circuit in an optical disk drive for adjusting the duty cycle of the write signals by a duty cycle adjusting unit. The write signal control circuit includes a write signal...
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7430239 |
Bit-detection arrangement and apparatus for reproducing information
A preprocessing unit converts an analog signal to a processed signal at a sample rate controlled by a first clock signal. A digital phase locked loop locks on the processed signal and outputs a...
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7428197 |
PLL circuit and recorded information playback apparatus
A PLL circuit having an analog-to-digital converter; a phase error detecting circuit; and an oscillator, in which the phase error detecting circuit includes: phase error detecting means detecting a...
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7400561 |
Single PLL demodulation of pre-formatted information embedded in optical recording medium
A method and apparatus demodulate pre-formatted information embedded in an optical recording medium. The demodulation includes (a) receiving a wobble signal representing data symbols...
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7310296 |
Method for decoding address in pre-groove data of an optical disc drive
A method for optical drive decoding of address in pre-groove (ADIP) data is provided to decode an input wobble signal to an ADIP unit signal. The method includes generating a wobble carrier...
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7248194 |
Bit-detection arrangement and apparatus for reproducing information
Disclosed is a bit-detection arrangement able to convert an analog signal (AS) having an amplitude into a digital signal (DS) representing a bit sequence from which the analog signal (AS) is...
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7200093 |
Method and related apparatus for decoding information carried by wobble signals
An apparatus for generating a wobble clock includes an operation circuit for receiving a wobble signal and counting cycles of an oscillating signal during a cycle of the wobble signal to derive a...
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7196998 |
Method of determining ADIP information through counting identical bits and different bits
A method of identifying ADIP information through counting identical bits and different bits includes generating a wobble clock according to a wobble signal, generating a calculation result...
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RE39513 |
Demodulation circuit for demodulating wobbling signal
A device for demodulating position information that is recorded as track wobbling in a record medium by a BPSK scheme includes a carrier-wave-generation circuit which derives a carrier wave from a...
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7113463 |
Optical disk device controlling a revolution of a recordable optical disk according to a displacement between a phase of a sector synchronizing signal generated from a data-writing reference clock signal and a phase of a synchronizing signal obtained from address
An optical disk device that records and reproduces information on/from a recordable optical disk is provided. The optical disk device comprises a reference clock signal generating unit generating a...
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7102976 |
Apparatus and method for generating write pulse for optical storage medium using ring oscillator
An apparatus and a method for generating a write pulse to be written on an optical storage medium using a ring oscillator are provided. The apparatus includes a ring oscillator outputting n tap...
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7085209 |
Record carrier having a servo track with non-modulated parts at a first frequency and modulated parts at a second frequency, and apparatus for scanning the record carrier
A record carrier (1) has a servo track (4) indicating an information track (9) intended for recording information blocks represented by marks, the servo track (4) having a periodic variation of a...
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7065028 |
Method and device for generating a clock signal that is coupled to a reference signal
In order to generate a clock signal (fT1) that is coupled to a reference signal (FBAS), especially to an analog video signal, a free-running clock pulse (fT1) is generated from a high-frequency...
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7027375 |
Multi-value data recording and reproducing device
A multi-value data recording and reproducing device is provided that can accurately eliminate interference among codes through waveform equalization when reproducing information from a reproduction...
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6947365 |
Method for protecting phase lock loop in optical system
A method for protecting a phase lock loop (PLL) in an optical system is disclosed. The disclosed method will determine whether the currently reading data is erroneous and then maintain the...
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6891785 |
Optical disc reproduction apparatus
An optical disc reproduction apparatus includes a sector detection section for detecting a sector; a sector reproduction time measuring section for measuring a reproduction time of the sector, and...
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6872798 |
Polycarbonate composite material which can be thermoplastically shaped, methods for the production thereof, use of the same and a flame-proof polycarbonate moulded part
The invention relates to a polycarbonate composite material which can be thermoplastically shaped and which comprises at least two layers. The invention is characterised in that at least one layer...
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6816095 |
Parallel/serial conversion circuit, light output control circuit, and optical recording apparatus
A high speed, high accuracy parallel/serial conversion circuit, wherein a PLL circuit 50 receives as input and locks a clock CLK, and supplies the same to different parts of an apparatus; the PLL...
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6788484 |
PLL circuit, data detection circuit and disk apparatus
A PLL circuit is disclosed which extracts phase difference information of a high S/N ratio from a readout signal uses the phase difference information for PLL control. An A/D converter samples the...
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6775217 |
Multi-stage ring oscillator for providing stable delays on EFM data pulses for recording CD-R and CD-RW medium
The invention provides a method and apparatus for generating delays to shift edges of an EFM data stream from an EFM modulator for a CD-R and CD-RW write encoder. EFM data pulse edges may be...
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6765856 |
Information reproducing apparatus and phase lock control apparatus
A sample of an information signal is periodically generated in response to a sampling clock signal. A level relation between successive ones of the information-signal samples is detected. A...
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6654325 |
Trial writing method and optical disk system using the same
A method of recording information on an information medium, especially on an optical recording medium with light. It has been hard to determine optimum power accurately due to the influence of the...
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6636467 |
Method and apparatus for accurately calibrating the timing of a write onto storage media
The write-timing calibration involves (1) writing a calibration data sequence referenced to a physical timing clock (such as a wobble clock on a DVD disk), (2) measuring the timing offset or phase...
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