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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...
7619841 Disk drive subtracting low frequency disturbance from a servo burst signal  
A disk drive is disclosed including a disk having a plurality of data tracks, wherein each data track comprises a plurality of data sectors and a plurality of servo sectors, and each servo sector...
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...
7561357 Decoder with energization control circuit  
A multistage decoder circuit has an error reduction stage that includes an adaptation circuit. The adaptation circuit provides adaptable error reduction as a function of bit error rate. The...
7561361 Dynamic synchronization of timing signals  
A synchronization system includes a signal generating module that generates a signal comprising modulated waveforms and a timing window generator that generates a timing window. A proportional...
7532425 Reproducing method, reproducing apparatus, recording and reproducing apparatus, and magnetic recording medium  
A recording and reproducing apparatus includes: a recording section for recording an information signal in a magnetic recording medium including a magnetic layer including hexagonal ferrite; a...
7532421 Servo demodulating circuit and method  
Servo demodulation is performed by appropriately compensating for demodulation errors caused by fluctuation of the replayed signal amplitude of a phase servo pattern. A servo demodulating circuit...
7502186 Disk drive clock tracking circuit, error compensation circuit and method  
A clock tracking circuit and method uses a clock compensation signal to compensate for timing marks on a media disk. The clock compensation signal may compensate for at least one of improper clock...
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...
7486456 Finite field based short error propagation modulation codes  
The invention relates to a data modulation method applicable to make data streams tend to have desired properties, useful for clock recovery, making signals more distinguishable, or enforcing...
7463437 Demodulation compensation for spiral servo tracks in hard disk drives  
A servo compensation processor comprises a peak locator that estimates a location of a peak amplitude of a waveform with respect to a plurality of samples of the waveform. The waveform is generated...
7453663 Disk drives with servo burst patterns radially offset in different radial spokes of a disk and methods of positioning based thereon  
A disk drive includes a rotatable disk, a transducer, an actuator, and a controller. The disk includes a first servo burst pattern in a first radial spoke of the disk, and a second servo burst...
7430082 Circuit and method for demodulating a servo position burst  
A new technique for Hard Disk Drive (HDD) servo-burst demodulation is provided. A 4-samples per dibit Discrete Fourier Transform (DFT) amplitude estimation is used to calculate the read-head...
7405894 Frequency, phase, and gain estimation technique for use in a read channel receiver of a hard disk drive  
One or more methods and systems are presented for performing gain and timing acquisition of data read from one or more data sectors of a hard disk drive. The gain and timing information may be used...
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...
7362525 PRML based magnetic servo position demodulator  
Apparatuses and methods for detecting reference marks on magnetic data storage mediums are described herein. In one variation, the apparatus comprises a magnetic servo position demodulator operable...
7349167 Utilizing track identification fields for timing recovery  
An apparatus comprises a data storage medium having a plurality of servo sectors and a plurality of data sectors, wherein each of the servo sectors includes a phase locked loop field and a track...
7342734 Disk drives with radially aligned servo burst patterns that generate orthogonal contributions to a read signal and related demodulators and methods  
A disk drive includes a rotatable data storage disk, a transducer, an actuator, and a servo burst demodulator. The rotatable data storage disk includes a plurality of servo burst patterns thereon....
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...
7199955 Decoding apparatus and decoding method  
In a coding method which does not restrict a run length of “1” while data is recorded/reproduced, there are such a drawback that when an error correction is carried out, a total number of error...
7196859 Processing techniques for time-based servo patterns  
Techniques are described for accurately processing playback signals of time-based servo patterns recorded on a data storage medium. In particular, techniques are described for determining values...
7173784 Apparatus for providing data dependent detection in a data read channel  
An apparatus for providing data dependent detection in a data read channel is disclosed. Parameters in a read channel are dynamically adjusted according to data dependent noise. For example, a...
7169489 Hydrogen storage, distribution, and recovery system  
Cassette based systems and methods of hydrogen storage, distribution, and recovery are disclosed. A cassette or other container may contain a hydrogen storage or storing material. Information may...
7142382 Phase adjustment circuit and demodulation circuit  
A phase adjustment circuit includes: a carrier-wave-delay adjusting circuit for delaying an input carrier wave and outputting the delayed carrier wave, in accordance with phase information; and a...
7133228 Using data compression to achieve lower linear bit densities on a storage medium  
Method and apparatus for transferring data to and from a data storage medium, such as a rotatable disc in a data storage device. The medium includes a data sector field with a physical length...
7092177 Methods for searching for SAM patterns using multiple sets of servo demodulation detection parameters  
Methods for searching for a servo address mark (SAM) pattern using multiple sets of servo demodulation detection parameters are provided. A SAM pattern is searched for using a first set of servo...
7075742 Servo demodulator systems including multiple servo demodulators  
Servo demodulation systems including multiple servo demodulators are provided. A first servo demodulator is adapted to search for a servo address mark (SAM) pattern using a first set of servo...
7072128 Methods for searching for SAM patterns at multiple nominal frequencies  
Methods are provided for improving servo-demodulation robustness, especially when used with a disk having zone bit recorded servo wedges. A servo address mark (SAM) pattern is searched for, within...
7054083 Systems for searching for SAM patterns at multiple nominal frequencies  
Systems are provided for improving servo-demodulation robustness, especially when used with a disk having zone bit recorded servo wedges. The systems include a first servo demodulator adapted to...
7023631 Bi-frequency servo pattern  
A data storage device for retrieving data includes a controllably positionable head and a storage medium having servo information comprising a phase pattern having a first frequency and a PES...
7009791 Position detecting method, information recording/reproducing device and information recording medium  
A position information signal pattern is recorded into a recording medium. The position information signal pattern is configured by arranging graphics having a circular shape, a rectangular shape...
6992855 Methods for limiting channel control values to thereby improve servo-demodulation robustness  
Methods are provided for limiting channel control values, such as servo automatic gain control (AGC) values and/or servo phase lock loop (PLL) values, within respective desired ranges. Keeping such...
6992856 Systems for limiting channel control values to thereby improve servo-demodulation robustness  
Systems are provided for limiting channel control values, such as servo automatic gain control (AGC) values and/or servo phase lock loop (PLL) values, within respective desired ranges. Keeping such...
6985316 Method and apparatus for performing seek operations in a disk drive having a disk surface with spiral servo information written thereon  
The present invention is directed to a method and apparatus for performing seek operations in a disk drive having a disk surface with spiral servo information written thereon. In one embodiment, a...
6956712 Head position demodulating method and disk apparatus  
A head position is demodulated by two-phase servo signals of PosN and PosQ from output of the head, so as to acquire a more accurate demodulated position. Saturation of PosN and PosQ is judged from...
6943970 Position demodulating method and circuit of disk apparatus  
Position information PosN and PosQ are compared and position information Pos 1 and Pos 2 in which influences of an error of a position sensitivity gain appear oppositely are calculated....
6930845 Data writing and reading  
Method and apparatus for recording data on a magnetic recording medium and writing data to a computer bus in which the data is divided into words of a predetermined length, a signal is generated...
6922297 Double-attribute method of encoding and decoding magnetic data  
A method of encoding and decoding data involving the simultaneous application of pulse width modulation and pulse position modulation systems to data intended for storage on a magnetic disk medium.
6919771 Digital amplifier  
An object of the present invention is to provide a digital amplifier which is capable of preventing a reproduction of an analogue audio signal from a loud speaker, when an output sound volume from...
6819512 Triple-attribute method of encoding and decoding magnetic data  
A method of encoding and decoding data involving the simultaneous application of pulse amplitude modulation, pulse width modulation, and pulse position modulation systems to data intended for...
6804071 Digital recording apparatus non-influenced by recording data rate and low frequency cut-off, and enhancing high frequency components of data being recorded  
Digital data recording apparatus includes a modulator for modulating a recording clock by a recording data. A reference voltage and a reference current in signal processing are set based on a...
6785071 Disk drive writer waveform induced precompensation  
A disk driver writer precompensation system modulates the write current waveform based on a pattern of data bits magnetically recorded on a medium in order to adjust the timing of magnetic...
6738211 Recording and reproducing apparatus  
Automatic-signal-selecting is provided for controlling which output is supplied from a switch, i.e., a digital signal or an analog signal. The control is carried out based on information selected...
6731441 Information recording and reproducing apparatus  
Here is disclosed an information recording and reproducing apparatus comprising a multi-phase quadrature angular modulator for subjecting a signal to be written on a recording medium to multi-phase...
6710951 Phase locked loop employing a fractional frequency synthesizer as a variable oscillator  
A phase locked loop (PLL) circuit is disclosed comprising a phase detector for generating a phase error between an input oscillating signal and an output oscillating signal. A fractional frequency...
6687079 Apparatus and method for providing servo gain linearization for a magneto-resistive head  
A method and apparatus for generating a position information signal for the head of a hard disk drive. The disk has a track which contains a plurality of servo bursts that allow the head to be...
6678110 Robust servo demodulation filtering method  
A robust and efficient method for determining the location of a transducer head in a mass storage system. A position-indicative signal characterized by a fundamental frequency F is received from a...
6600613 Demodulation of magnetically recorded data  
There is disclosed a pattern matching technique for comparing (a) signals representing detected magnetically recorded characters against (b) a set of predetermined idealized reference signals...
6510015 Magnetic disc having physical servo patterns with a magnetic carrier, and method of making and using the same  
A magnetic medium comprises a magnetic disc having a read surface that has a plurality of tracks, at least some having servo sectors. The servo sectors comprise a plurality of magnetic...
6498695 Method of detecting position on disk, disk unit and disk  
A method of detecting a position on a disk is applied to a disk which is time-divisionally recorded with a data region and a servo region based on a signal read from the disk, where the servo...
Matches 1 - 50 out of 187 1 2 3 4 >