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| Number | Title | Issue Date |
| 8094534 | Information reproducing apparatus and method, and computer program An information reproducing apparatus (1) is provided with: a waveform shaping device (14) for performing waveform shaping on a read signal (RRF) read from a recording medium (100), on the basis of a reference amplification factor; a c... | 01/10/2012 |
| 7952974 | Apparatus and method for measuring signal quality An apparatus and method for measuring the quality of a signal on an optical disc based on level information of a viterbi decoder are provided. The signal quality measuring apparatus includes: a binary unit that generates binary signals from input RF signals; a chann... | 05/31/2011 |
| 7929393 | Optical information recording device and recording correction calculation method When recording recording information by forming on a recording medium a recording mark whose mark length is an integral multiple of the reference mark length according to a recording signal generated from a recording information signal, this method performs a proces... | 04/19/2011 |
| 7903521 | Write splice for optical recording channels An enhanced write splice for optical recording channels is disclosed. Optical control circuitry locks to previously-written data and determines the estimated write splice location. A training sequence is written to the optical medium at a location based on the estim... | 03/08/2011 |
| 7804755 | Method for determining characteristics of signal and apparatus using the same A method of determining characteristics of a signal and an apparatus using the method. The apparatus for determining characteristics of a signal includes: a level detector receiving sample values of a radio frequency (RF) signal and binary data obtained by binarizin... | 09/28/2010 |
| 7801005 | Apparatus and method for measuring signal quality An apparatus and method for measuring the quality of a signal on an optical disc based on level information of a viterbi decoder are provided. The signal quality measuring apparatus includes: a binary unit that generates binary signals from input RF signals; a chann... | 09/21/2010 |
| 7787345 | Optical storage medium, optical read/write apparatus, and optical read/write method An optical read/write apparatus causes a read/write light beam from illuminating means to strike only one side of an optical storage medium including stacked data storage layers each of which is readable/writeable separately from the other layers. In this case, the ... | 08/31/2010 |
| 7660224 | DC-controlled encoding for optical storage system A loss of performance of slicer adaptation at high capacities due to the mismatch between the exact bits used in the computation of the RDS for the DC-control on the one hand and the often erroneous threshold decisions that are preliminarily made based on the HF wav... | 02/09/2010 |
| 7394740 | Reproduction signal evaluation method A reproduction signal evaluation method of this invention includes the step of obtaining a reproduction signal from an information recording medium on which digital information is recorded with record marks having different sizes, the step of obtaining the amplitude... | 07/01/2008 |
| 7369476 | Device for reading from or writing to optical recording media having a control unit for a data slicer The present invention relates to a device for reading from and/or writing to optical recording media (1) having an optical scanner (2) for scanning the recording medium (1) by means of a light beam (3) and for generating scanning signals ... | 05/06/2008 |
| 7369625 | Apparatus and method for slicing RF signal and compensating for the slice level of RF signal in disk drive An apparatus and method for slicing an RF signal and compensating for the slice level of an RF signal reproduced from a disk, which minimizes a block error rate by optimizing the slice level of the RF signal according to variations in symmetry of the RF signal when ... | 05/06/2008 |
| 7366067 | Recording clock signal generating apparatus and recording clock signal generating method for information recording device A combined signal Spc in which a pre-pit signal is superposed on a wobble signal is generated based on a radial push-pull signal Spp with a noise component having been removed therefrom. Based on the combined signal Spc, a wobble signal SWB with the phase... | 04/29/2008 |
| 7355948 | Detector for detecting information carried by a signal having a sawtooth-like shape A detector for detecting information carried by a signal having a sawtooth-like shape. The detector includes a low-pass filter for receiving the wobble signal and filtering the wobble signal to generate a filtered signal, a comparator for comparing the wobble signal... | 04/08/2008 |
| 7349297 | Method and apparatus for acquiring an index mark A method and apparatus for reading an index mark pattern. The pattern may be formed on an optical disc medium. The optical disc medium may include a set of data arranged in a data field, and an index mark pattern for identifying a relative location of the data field... | 03/25/2008 |
| 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 device coupled to the comparator and the waveform generator for modify... | 02/19/2008 |
| 7319722 | Circuit for the decoding of biphase signals A decoding circuit and associated method are provided for decoding a biphase signal. The decoding circuit may include a precharging register to precharge a pair of states of the biphase signal, where a state of the pair of states is precharged at each pulse of a per... | 01/15/2008 |
| 7315968 | Phase error determination method and digital phase-locked loop system In a digital PLL system, instead of measuring a binarized playback RF signal with a high frequency clock, pulse-length data is generated by using N phase clocks (for example, 16 phase clocks). The pulse-length data is then counted with a virtual channel clock so as ... | 01/01/2008 |
| 7315263 | Data modulating method and apparatus, data demodulating method and apparatus, and code arranging method In a data demodulating method and apparatus, and a code arranging method, a multiplexer multiplexes an input data stream divided by a predetermined length into a plurality of types of pseudo-random data streams using multiplexed information of predetermined bits by ... | 01/01/2008 |
| 7315498 | DVD reproducing apparatus, disk reproducing apparatus and DVD reproducing method A DVD reproducing apparatus includes a pickup to read data from a disk having a pit data area to form pits along tracks and an NBCA to read data by laser cutting in a radial direction, a tracking error signal generator to generate a tracking error signal, an RF sign... | 01/01/2008 |
| 7312728 | Data modulating method and apparatus, data demodulating method and apparatus, and code arranging method In a data demodulating method and apparatus, and a code arranging method, a multiplexer multiplexes an input data stream divided by a predetermined length into a plurality of types of pseudo random data streams using multiplexed information of predetermined bits by ... | 12/25/2007 |
| 7289413 | Data slicer and data slicing method for optical disc system In a data slicer and data slicing method for an optical disc system, the data slicer for converting an analog input signal into a digital signal includes a comparator, a duty detector, and a low pass filter. The comparator compares the analog input signal with a fee... | 10/30/2007 |
| 7266076 | Automatic detecting device for land pre-pits signals An automatic detecting device of land pre-pits signal is disclosed. The device adjusts gain of push-pull signals to raise the signal to noise ratio of the land pre-pits signal to the wobble signal. Digital logic computation is also utilized to recognize the practica... | 09/04/2007 |
| 7263048 | Method for decoding disc information A pre-treating circuit for accessing the disc and a method thereof, which are especially used for treating the signal waveform that violates the encoding rule of the disc information, are provided. The present invention can modulate the signal waveform that violates... | 08/28/2007 |
| 7248546 | Data slice generation method and apparatus for optical disk drive A data slice signal generation method of an optical disk drive, which uses a disk including header areas and data areas of different materials, includes the following steps. First, a data slice signal is generated according to the RF signal read by the optical picku... | 07/24/2007 |
| 7236447 | Optical disk, method of playing optical disk, and optical disk drive An optical disk includes a recording region formed on a substrate for recording user data, and a management region formed on the substrate which includes an identification information region for recording disk-specific identification information such as address info... | 06/26/2007 |
| 7233780 | Method and apparatus for performing DC offset cancellation in a receiver An amplification system for reducing DC offset in an input signal uses a low pass filter to isolate a DC component of the input signal. The system then subtracts the DC component from the input signal. In one embodiment, the system includes first and second amplifie... | 06/19/2007 |
| 7224659 | Disk reproducing device with suppressed reproduction signal error An RF signal that is a disk reproduction signal is binarized through an equalizer and a slicer, followed by data demodulation, and an error rate of the reproduction signal is detected in an error detection circuit. If the error rate in the error detection circuit is... | 05/29/2007 |
| 7215613 | Optical disk apparatus Without waiting for the rotational speed of an optical disk reaches a rotational speed (Vb) for a reproduction process, a cutoff frequency (Fca) of an RF signal and a boost amount (Bt) for an equalizer circuit are detected, and, with using the rotational speed (Va) ... | 05/08/2007 |
| 7212486 | Optical disk device setting a gain of an amplifier so that a peak value and a bottom value of wobble signal components coincide In this optical disk device, a reflected light of a light beam reflected from a pre-pit-formed side of a track wobbled on a disk is detected as a first detection signal. A reflected light of the light beam reflected from the other side of the track is detected as a ... | 05/01/2007 |
| 7212596 | Data detection circuit and method A data detection circuit and method detect a first bit that is the least significant among bits having a value 1 in N-bit input binary data and a second bit that is the second least significant among bits having the value 1 in the N-bit input data. The data detectio... | 05/01/2007 |
| 7209421 | Optical disk apparatus for detecting wobble signal An optical disk apparatus for driving an optical disk having formed therein sawtooth wobbles of +STW and −STW. A pickup receives a laser beam reflected from the optical disk and supplies a reproduced signal to a wobble signal processing section. The wobble signal ... | 04/24/2007 |
| 7209417 | Method of and apparatus for recording data on defective optical storage media and computer readable medium storing the method A method of recording data in a defective area of an optical storage medium. The method includes the steps of detecting a write start address in response to a write command; checking, when the write start address is not detected due to unstable servo control signals... | 04/24/2007 |
| 7203149 | PLL circuit and data read-out circuit Disclosed is a PLL circuit having a voltage-controlled oscillator, to which a difference voltage across non-inverting and inverting input terminals is input as a control voltage, for oscillating at a frequency in accordance with the control voltage; a phase comparat... | 04/10/2007 |
| 7200089 | Disk reproducing device reproducing information recorded on recording medium by multiple recording devices A disk is placed into a disk drive device to be held therein. Then, a laser pickup is moved to the inner edge of the disk in step S1, various servos are automatically adjusted in step S2, TOC information of the disk is read in step S3, and a DBA... | 04/03/2007 |
| 7196997 | Waveform equalizer for obtaining a corrected signal and apparatus for reproducing information The waveform equalizer (6) for obtaining a corrected signal S′ by performing a waveform equalization to a read signal S read out from an information carrier (1). The waveform equalizer (6) has a first filter (61) able to perform a filte... | 03/27/2007 |
| 7193951 | Disk device and method for controlling threshold value of disc device A disk apparatus (10) includes a spindle (62) to which a magnetooptical disk (60) is attached. An FCM is formed on the magnetooptical disk (60) along a track at intervals of a predetermined period, a laser beam having a different light am... | 03/20/2007 |
| 7187635 | Optical information reproducing method and apparatus for performing reproduction compensation The present invention provides an optical information reproducing method of detecting a record mark formed in an optical information recording medium and generating a reproduced signal, comprising the steps of: detecting a mark length of each record mark on basis of... | 03/06/2007 |
| 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 signal between the adjusted first and second detection signa... | 02/13/2007 |
| 7174279 | Test system with differential signal measurement A test system with easy to fabricate hardware to make measurements on differential signals. The two legs of a differential signal are applied to a comparator. A variable bias is introduced into the comparison operation. By taking multiple measurements with different... | 02/06/2007 |
| 7164643 | Data extraction for an optical disc drive A method of increasing data extraction compatibility for an optical disc drive is disclosed. The method first provides extraction parameter sets, wherein the extraction parameter sets comprise a first extraction parameter set and a second extraction parameter set. T... | 01/16/2007 |
