|
Match
|
Document |
Document Title |
|
|
7643238 |
Dibit extraction
A novel means for performing dibit extraction is presented. Any one of an unequalized signal dibit, equalized signal dibit, or noise dibit can be extracted. Instead of using the correlation...
|
|
|
7643233 |
Disk clock system with up-sampler to generate frequency offset
A system reads data from a magnetic storage media. A read head reads data from the magnetic storage media and produce an analog signal. A variable gain amplifier amplifies the analog signal. An...
|
|
|
7639443 |
Magnetic disk controller and method
Among other disclosed subject matter, a magnetic disk controller includes an interface that receives and transmits data to be written into a magnetic disk. The magnetic disk controller includes a...
|
|
|
7636219 |
Magnetic recording and reproducing apparatus and magnetic recording and reproducing method
A magnetic recording and reproducing apparatus is disclosed which includes: a recording device configured to record with a write head a plurality of tracks constituting a unit of signal processing...
|
|
|
7602567 |
Feed-forward DC restoration in a perpendicular magnetic read channel
A method of feed-forward DC restoration in a perpendicular magnetic read channel is disclosed. The method generally includes the steps of (A) generating a feed-forward signal by performing a first...
|
|
|
7586704 |
Method and apparatus for improving threshold detection of servo data in the presence of signal asymmetry
An adaptive asymmetry control circuit is described. Such a circuit may be used in magnetic recording applications, for example. The adaptive asymmetry control circuit uses a peak detector which...
|
|
|
7586705 |
Magnetic recording/reproducing apparatus and magnetic recording/reproducing method
A magnetic recording/reproducing apparatus is disclosed wherein reproduced signals read out from a plurality of recording tracks using a reproducing head can be separated into original recording...
|
|
|
7586706 |
Method for checking the quality of servo gray codes
A dynamic threshold detector for a magnetic storage medium comprises a transition detector that receives data comprising pairs of values based on data received from the magnetic storage medium,...
|
|
|
7583456 |
Method and apparatus to limit DC-level in coded data
In a perpendicular magnetic recording system, the data that is being written by the write channel is fed back into the read channel. The read channel processes the data and decides if the written...
|
|
|
7583458 |
Channel optimization metrics
A recording system, such as a magnetic or optical recording system, employs optimization metrics that are independent of a target partial response for equalization of a signal read from a recording...
|
|
|
7583469 |
Up-sampled filtering for servo demodulation
An apparatus, method, and system for providing a fine adjustment for transducing head positioning in a hard disk drive (HDD). The apparatus, method, and system include reading a positioning error...
|
|
|
7580216 |
Disk servo pattern writing
Systems and techniques to write servo patterns on machine-readable media. In general, in one implementation, the technique includes: obtaining timing information from a spiral servo reference track...
|
|
|
7573665 |
Magnetic tape read channel signal values developed employing intermediate bits of the path memory of a PRML Viterbi detector
Magnetic tape read channel signal values are developed employing intermediate bits of the path memory of a PRML Viterbi detector. Identification logic identifies a most likely path memory state of...
|
|
|
7564931 |
Robust maximum-likelihood based timing recovery
A method of timing recovery comprises receiving an input signal, sampling the input signal to produce a plurality of signal samples, detecting the samples to produce an output signal, and...
|
|
|
7558012 |
Read/write channel embedded on-chip optimization
Embodiments of the present invention provide optimization of read/write channels in a recording system by embedding channel optimization algorithm/procedure into the channels, or a system-on-chip...
|
|
|
7554757 |
Magnetic storage write heads using micro-electro mechanical shutters
A write head for a magnetic storage system energizes a write coil for a plurality of bit intervals and selectively shutters the magnetic field to alter a magnetic domain of a magnetic storage...
|
|
|
7525746 |
DC-offset compensation loops for magnetic recording system
An apparatus, method, and system for providing dc offset reduction in a communications channel include a feedback loop to generate dc offset correction signals, which in turn are combined with an...
|
|
|
7522361 |
Method for detecting signal used when reading information from storage device
The storage device 10 provides a signal detection method for preventing the degradation of an error rate at the time of information reading, caused by the change of a magnetic characteristic due...
|
|
|
7522367 |
Asynchronous read channel shaped toward generalized partial response characteristics
Provided is an asynchronous read channel shaped toward generalized partial response characteristics. The read channel is incorporated in a storage device to process signals read from a storage...
|
|
|
7499233 |
Multi-phase control information detection and signal polarity determination
Interpreting signals on a noisy channel with polarity uncertainty. A signal processor, such as a read channel transceiver device usable in a magnetic recording system, includes a first detector...
|
|
|
7489461 |
Disk drive, medium and method of compensating for a write parameter
A disk drive, medium, and method controlling a write parameter of a disk drive are provided. The method of compensating for a write parameter, in order to control a write operation of a disk drive,...
|
|
|
7489460 |
Magnetic data read circuit and card processing unit
A magnetic data read circuit includes a differentiation circuit and an integration circuit which are individually connected to a magnetic head, and a means of read judgment for pass/fail judgment...
|
|
|
7463820 |
Data reproducing apparatus and data reproducing method
The present invention relates to a non-tracking VTR apparatus. The data reproducing apparatus is characterized in that, of tracks of the predetermined number serving as the editing unit, tracks of...
|
|
|
7460323 |
Methods and systems for automatically characterizing non-linearities of a read-back signal of a recording system
A method for automatically characterizing non-linearities of a perpendicular read-back signal of a recording system is disclosed. The method includes using dibit extraction to obtain a read-back...
|
|
|
7443623 |
Peak detection for magnetic tape timing based servo
Selection of servo signals for peak detection of timing based servo tracks of magnetic tape for lateral positioning of heads relative to the magnetic tape. Servo signals from magneto-resistive...
|
|
|
7440675 |
AV information reproducing system and a reproducing method applied to the same system
In a system for reproducing AV information from a recording medium, such as a DVD, not only are usual titles reproduced, but also related information relevant to specific stream information is...
|
|
|
7440208 |
Flexible partial response targets for data detectors
Automatically optimizing and programming features of a disk drive read channel for a selected partial response (PR) target. This enables flexible PR targets to be used in the read channel. The...
|
|
|
7440209 |
Communications channel with programmable coupling
A communications circuit comprises a first filter having a first corner frequency that is programmable. A data type identifier tracks first and second types of data flowing through the...
|
|
|
7433141 |
Data randomization for rewriting in recording/reproduction apparatus
A data recording/recovery device ( 20 ) comprises a packet generator ( 34 ) for including recordable information into a packet ( 44 ), the packet initially having a nominal run length limited (RLL)...
|
|
|
7423827 |
Systems and methods for accessing data from a variable polarity head assembly
Various systems and methods for accessing data via a variable polarity head assembly are disclosed herein. As one example, a method for accessing data is disclosed that includes receiving a data...
|
|
|
7423826 |
Readback system providing a combined sample output including multiple samples per bit
A readback system includes a magnetic sensor that receives a sensor current. The magnetic sensor senses magnetic bits at a bit frequency and generates a sensor output. The readback system includes...
|
|
|
7408729 |
Enhanced data storage and retrieval devices and systems and methods for utilizing same
The present invention relates generally to the storage and/or retrieval of information on magnetic storage media by using one or more novel approaches alone or in combination. These novel...
|
|
|
7403350 |
Multiple servo sensor configuration for magnetic tape timing based servo
Multiple servo sensors are laterally displaced over a distance less than the transverse width of timing based servo track laterally extending transitions. The servo sensors are configured to sense...
|
|
|
7388724 |
Pulse-slimming for a tape servo system using non-linear gain
Pulses generated from servo stripes of a servo tape system are narrowed by using non-linear gain enabling precise position of the read head. Non-linear gain based on the amplitude of each pulse is...
|
|
|
7365926 |
Signal processing method of magnetic recording medium and magnetic record reproduction apparatus
When signals are read out by a magnetic head from a magnetic recording medium on which magnetic bits corresponding to information are recorded along the tracks thereof by a magnetic transfer...
|
|
|
7362959 |
Method of and device for encoding an information stream
The application relates to a method of and devices for encoding an information stream ( 20 ) into a variable bit rate (VBR) encoded information stream ( 24 ). The application discloses a method of...
|
|
|
7359135 |
Dynamically adapting a magnetic tape read channel equalizer
A read channel equalizer of a magnetic tape drive which equalizes digitally sampled magnetic signals detected by a read head is dynamically adapted. A detector of equalizer dynamic adaptation logic...
|
|
|
7345839 |
Signal processing in a disc drive
A disc drive system, such as a magnetic or optical recording and/or playback system, for low-data rate applications implements one or more circuit operations, such as read signal detection and...
|
|
|
7333289 |
Magnetic recording and reproducing apparatus, method of controlling the same, magnetic recording medium, and stamper for manufacturing magnetic recording medium
A magnetic recording and reproducing apparatus and a method of controlling the same, capable of increasing the output of a position control signal and performing a precise positioning control of a...
|
|
|
7330320 |
Method and apparatus to limit DC-level in coded data
In a perpendicular magnetic recording system, the data that is being written by the write channel is fed back into the read channel. The read channel processes the data and decides if the written...
|
|
|
7319567 |
Servo sector in magnetic disk drive
Embodiments of the invention lower the servo sector's share of each track and ensure that servo sector numbers are reliably determined. According to the embodiment, in the servo sector number (SSA)...
|
|
|
7317586 |
Methods and structure for general purpose interval accumulating filter for measuring operational parameters of a digital read channel
Methods and structures for a general purpose, discrete time sample, interval accumulating filter for measuring any of a plurality of parameters associated with operation of a digital read channel....
|
|
|
7315427 |
Method for checking the quality of servo Gray codes
A dynamic threshold detector for a magnetic storage medium comprises a transition detector that receives the data comprising pairs of numbers based on data received from the magnetic storage...
|
|
|
7307807 |
Disk servo pattern writing
Systems and techniques to write servo patterns on machine-readable media. In general, in one implementation, the technique includes: obtaining timing information from a spiral servo reference track...
|
|
|
7307808 |
Magnetic recording and reproducing apparatus and control method thereof, magnetic recording medium, and stamper for manufacturing of magnetic recording medium
A magnetic recording and reproducing apparatus has a magnetic recording medium onto which servo information including position information is recorded by a concavo-convex pattern formed by a...
|
|
|
7286313 |
Correcting radial incoherence in servo track sensing
A servo track sensing system receives equalized servo data from a servo demodulator and corrects for radial incoherence in the servo data. The system has a radial incoherence estimator that...
|
|
|
RE39771 |
Code conversion method and apparatus, code recording medium, code recording apparatus and code reproducing apparatus
A code conversion method and apparatus is provided for scrambling and modulating data. The method and apparatus includes scrambling an input main data unit based on any of plural types of...
|
|
|
7253979 |
Method and device for data read/write, recording medium, and program product
A data read/write device includes a data write-processing unit that performs amplitude modulation on write data to obtain an amplitude-modulated signal that contains a plurality of amplitude...
|
|
|
7248425 |
Disk writing/reproducing apparatus and method
A disk writing apparatus includes: a temperature sensor sensing an ambient temperature of a disk; a sync mark generator generating a sync mark having a pattern when a writing temperature indicating...
|
|
|
7245449 |
Timing analysis of read back signals in magnetic recording devices
Analysis of a read back signal in a magnetic recording device is disclosed. The read back signal is converted to a digital read back signal, and a low frequency component of the digital read back...
|