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7385900 |
Reproducing apparatus
A transversal filter subjects a reproduced signal to partial-response waveform equalization responsive to tap coefficients to generate an equalization-resultant signal. There is generated 0-point...
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7372797 |
Data reproduction device
A data reproduction device for sampling a signal reproduced from a recording medium based on a synchronization clock signal synchronized with the reproduced signal includes: an analog-to-digital...
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7355938 |
Timing recovery method and storage apparatus for suppressing control of sampling positions
A timing recovery method samples, equalizes and detects a signal reproduced from a recording medium and to output a detection signal, controls sampling positions based on a phase error between the...
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7333568 |
Data slicer capable of calibrating current mismatch
A data slicer includes a comparator coupled with an input signal and a reference signal for generating a sliced signal, a waveform generator for generating a calibration signal, a pulse extension...
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7313069 |
Optical recording medium and recording apparatus, the medium including a linking region between unit block regions
An optical recording medium having a track on which data has been previously recorded, comprising on the track a plurality of data block regions each of which includes main data of a block which is...
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7307936 |
Disk drive device and address detection method with binarized push-pull signal
A disk drive device capable of satisfactorily detecting address information recorded by land prepits even after data is recorded is provided. When address information recorded by land prepits is...
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7295502 |
Optical desk apparatus
An error pulse is generated from a PRML circuit, and reproduction compatibility with a conventional apparatus is established. After a reproducing signal output from an optical head is equalized by...
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7289409 |
Method for processing a wobble signal
A wobble signal is generated from at least two elementary signals (A,B,C,D) detected by scanning a wobbled track of a data carrier. The invention proposes a solution for eliminating the noise of...
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7286458 |
Quality-testing apparatus and method
A quality-testing apparatus is disclosed for an optical disk of the type that stores optically readable information in the form of a spiral or annular pattern defining a plurality of essentially...
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7280455 |
Optical information recording condition adjustment method, recording/reproducing method and apparatus
The recording strategy is optimized by determining a pulse response so as to minimize the difference between the reproduced waveform obtained by recording and reproducing the recording pulse signal...
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7272092 |
Adaptive level-cutting method of CD-ROM drive's radio frequency ripple signal
An adaptive level-cutting method of a radio frequency ripple signal for a CD-ROM drive is proposed. A digital signal processor is added to accomplish adaptive cutting of the central level of the...
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7269105 |
Digital audio recording medium and reproducing apparatus thereof
A DVD audio data structure following high-sound-quality specifications is realized, making the best use of the audio data structure standard in DVD video. A first sample data string created by...
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7263054 |
Sample-and-hold interface circuit of a pickup head
A sample-and-hold interface circuit of a pickup head uses a circuit switch to control a voltage divider. When the circuit switch receives a signal Break, a voltage divider does not consume extra...
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7248188 |
Encoder and decoder
An encoded-bit-string generating unit generates a bit string encoded by scrambling an input bit string. A direct-current-component evaluating unit selects a bit string having a predetermined width...
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7242652 |
Optical recording system with optimal recording laser beam power control, and method and device for generating a mark formation effectiveness signal in an optical recording system
An optical recording system includes a laser light source that provides an incident recording light signal for recording information on an optical recording medium, an optical detector for...
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7215623 |
Reproduction signal processing apparatus
An analog filter is placed at a stage previous to an analog-digital converter (ADC), and a waveform equalizer is placed at a stage subsequent to the ADC. The sampling frequency of the ADC is...
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7200092 |
Method and device for adjusting reference level
A method for adjusting a reference level of an analog signal from a plurality of periodically sampled points includes the following steps. Firstly, a first level shift from an preliminary reference...
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7193942 |
Phase difference correction apparatus and data reproduction apparatus including data header detection apparatus
It is an object of the present invention to provide a phase difference correction apparatus and a data reproduction apparatus including a data header detection apparatus that can synchronize the...
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7177244 |
Optical disc apparatus
There are provided a balance adjustment circuit ( 6 ) for adjusting levels of first and second detection signals from a tracking detector, a differential circuit ( 8 ) for generating a difference...
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7167432 |
Read and write sample and hold signal generation
A system and method for generating sample control signals for a sample and hold circuit used to control access to optical media is provided. The sample control signals are generated with sufficient...
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7167328 |
Synchronizing an asynchronously detected servo signal to synchronous servo demodulation
A first set of data is detected in a signal having synchronous samples and interpolated samples, wherein the first set of data is detected asynchronously as corresponding to one of the samples. A...
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7154830 |
RF ripple signal compensator used with defect detection and fingerprint detection with help of dual A/D converter
A dynamic compensation device for radio frequency ripple signals of an optical storage system is disclosed. The device is composed of a radio frequency ripple signal process circuit, a radio...
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7123560 |
Apparatus for enabling PLL to lock on to a correct frequency and phase during the reproduction of a continuous-wave-corresponding signal and repetition of a specific pattern
In a PLL circuit, a phase error of a reproduced signal is extracted in either a way based on a zero-cross timing or a way based on a self-running timing. A decision is made as to whether the...
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7099256 |
Bi-phase mark reproduction apparatus and optical disk drive device with the same
A bi-phase mark reproduction apparatus which reduces an error rate of demodulated data by half and improves demodulation ability of ATIP and an optical disk drive device are provided. The bi-phase...
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7075875 |
Disk evaluation device
The invention has an object to provide a disk evaluation apparatus capable of performing a highly reliable disk evaluation even on a recording disk on which information is recorded in high density....
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7065027 |
Method for recovering data and control chip utilizing the same
A method for locating an electric level distribution range of sampled signals is provided. The electric level distribution range includes a plurality of reference levels. Firstly, a plurality of...
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7012872 |
Image reading device for an optical device
When an optical disc is set to the motor, the slice level is set to a slice level Sk as a reference slice level and a measured jitter value A (S 0 , S 1 ) is produced. The slice level is...
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7002889 |
Data reproduction method and apparatus
In a data reproduction method and apparatus of the present invention, a Viterbi detection unit is provided, the Viterbi detection unit having a plurality of detectors each providing a first partial...
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7002888 |
Optical recording apparatus and related method
An optical recording apparatus for recording a plurality of information units on an optical storage medium. Each of the information units includes a long run-length sync pattern. The optical...
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6999394 |
Optical disc playback apparatus
An optical disc playback apparatus that performs appropriate waveform equalization according to a difference in characteristics of reproduced signals between land parts and groove parts in an...
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6977970 |
Data reproducing apparatus and method for improving detection performance by adjusting decision levels used in data detector
A data reproducing apparatus and method for improving data detection performance by adjusting decision levels used in a data detector. The data reproducing apparatus includes an equalizer which...
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6928039 |
Method and apparatus for the reduction of power consumption in a compact disc player
A method and apparatus for playing compressed audio compact discs in a CD player is provided in which compressed audio data is cached in the local memory of the CD player. If a sufficient amount of...
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6922384 |
Information reproducing apparatus
An apparatus for reproducing information that has been digitally recorded on a storage medium includes first and second waveform equalizers. The first waveform equalizer equalizes a read signal,...
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6920100 |
Optical disk apparatus permitting high-precision Viterbi decoding
The optical disk apparatus is provided with a Viterbi decoder and an expected value correction circuit. The branch metric operation unit calculates first, second and third errors between sampling...
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6912474 |
Method and apparatus for high-speed synchronous digital acquisition derived in real -time from analog samples
A method and apparatus for real-time derivation of precise digital clock edges and synchronous logic samples from a digital signal having a clock channel and at least one data channel acquires a...
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6879551 |
Apparatus and method for generating RF signal and control signals in optical disc system
An apparatus and method for generating a radio frequency (RF) signal and control signals are provided. In an apparatus for generating a radio frequency (RF) signal and control signals in which the...
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6876617 |
Recording medium, recorder, and player
A recording medium, such as an optical disk, a recorder for recording data on the recording medium, and a player for playing back the data are described. Music information can be recorded on the...
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6876616 |
Digital signal reproducing apparatus
A binarizing device operates for controlling a slice level relative to a DC level of a reproduced signal in response to a slice level control signal to generate a controlling-resultant slice level,...
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6868053 |
Optical information recording apparatus for stable recording
In an apparatus for recording information to an optical recording medium, a laser beam is irradiated to and reflected from the medium. A photodetector detects the light quantity of the irradiated...
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6868050 |
Calibration method for writing to optical media
The present invention provides a method and system for calibration of writing to an optical medium. The method includes: sampling marks in a calibration area of the optical medium; and converting...
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6847602 |
Data detection in optical disk drives using decision feedback equalization
A method and apparatus in an optical disk system employing a decision feedback equalization (DFE) technique to provide a boosted signal resolution at a data slicer input while minimizing noise. In...
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6810000 |
Clock generator having a crosstalk removing circuit for use in a recording information reproduction apparatus
A clock generator in a recorded information reproduction apparatus for reproducing recorded information from a recording medium includes a pickup that produces a reading signal by reading a...
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6807134 |
Asymmetry detection apparatus, jitter detection apparatus, and recording/reproduction apparatus
An asymmetry detection apparatus includes: a clock signal generator for generating a clock signal based on a reproduced signal; an A/D converter for sampling the reproduced signal in...
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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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6781938 |
Expected value generation unit and a data reproduction apparatus
A data reproduction apparatus that employs an expected value generation unit that employs a maximum likelihood decoding algorithm, thereby an expected value is correctly determined from a histogram...
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6775219 |
Data reproduction control method and apparatus, and optical disk unit
The present invention realizes stable and more proper data reproduction even when a reproduced signal varies locally due to a noise or includes a steady distortion. In a data reproduction control...
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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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6760286 |
Method of transmitting data among a plurality of LSIs, and recording medium reproducing apparatus using the method
There is provided a recording medium reproducing apparatus in which a digital signal immediately before being inputted to a D/A converting LSI is prevented from being taken out and unfairly copied....
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6721710 |
Method and apparatus for audible fast-forward or reverse of compressed audio content
A method for performing audible fast-forward or reverse of audio content represented in a compressed format, such as, but not limited to, MPEG-1 Layer 3 (MP3) or MPEG-2 Advance Audio Coding (AAC)...
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6704263 |
Method of preventing recording on a disc like recording medium of the optically rewritable type
A next generation of high speed CD-RW discs for high speed recording (4×-10×) need a new write strategy, which is not suited for recording at lower speeds (1×4×). Existing CD-RW recorders may...
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