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| Number | Title | Issue Date |
| 7400205 | Frequency synthesizer and oscillation control method of frequency synthesizer The present invention provides a frequency synthesizer capable of switching an oscillation frequency band while maintaining a lock state realized with a small-scale and low-current-consumption circuit configuration, and an oscillation control method of the frequency... | 07/15/2008 |
| 7400464 | Synchronous RRO write A hard disk drive system includes a control module that generates a phase offset signal for a repeatable run out (RRO) field of a servo wedge based on an RRO phase of the RRO field and a data phase of data in at least one other servo wedge field of a previously writ... | 07/15/2008 |
| 7397621 | Servo pattern characterization on magnetic disks In one embodiment, a surface analyzer system comprises a radiation targeting assembly to target radiation onto a surface, a reflected radiation collecting assembly that collects radiation reflected from the surface, and a signal processing module. The signal process... | 07/08/2008 |
| 7397313 | Auto-gain controlled digital phase-locked loop and method thereof A digital PLL system includes a first multiplier coupled to a phase difference signal for multiplying the phase difference signal by a first gain factor; a second multiplier coupled to the phase difference signal for multiplying the phase difference signal by a seco... | 07/08/2008 |
| 7394608 | Read channel apparatus for asynchronous sampling and synchronous equalization A read channel and method using that read channel are disclosed. The read channel comprises an analog to digital converter which asynchronously samples at a fixed rate an analog signal formed by reading a data track, where that data track was written to a data stora... | 07/01/2008 |
| 7391583 | Fault tolerant sync mark detection while servo writing a disk drive from spiral tracks A method of writing product servo sectors to a disk of a disk drive is disclosed. The disk comprises a plurality of spiral tracks, wherein each spiral track comprises a high frequency signal interrupted at a predetermined interval by a sync mark. The read signal fro... | 06/24/2008 |
| 7391584 | Compensating for repeatable phase error when servo writing a disk drive from spiral tracks A method of servo writing a disk of a disk drive is disclosed. The disk comprises a plurality of spiral tracks, wherein each spiral track comprises a high frequency signal interrupted periodically by a sync mark. A timing recovery measurement is generated in respons... | 06/24/2008 |
| 7388938 | Method for bit-byte synchronization in sampling a data string Bit and byte synchronization for sampling and decoding a data string is provided a single data field u. The data string x has pre-pended to it a short string of 1s (ones), followed by u to yield a string y= . . . 1111, u, x. The string is pre-coded by convolution wi... | 06/17/2008 |
| 7382564 | Acquiring spiral servo information on a storage surface Various embodiments of the present invention are generally directed to processing servo data on a storage surface by detecting a time difference between consecutive read signal envelopes from spiral servo information on the surface. ... | 06/03/2008 |
| 7382568 | Circuit and method for detecting a servo wedge on spin-up of a data-storage disk A servo circuit includes a servo channel and a processor. The servo channel recovers servo data from servo wedges that identify respective data sectors on a data-storage disk. The processor detects one of the servo wedges on spin up of the disk, i.e., while the disk... | 06/03/2008 |
| 7379452 | Synchronous read channel A synchronous read channel having a single chip integrated circuit digital portion which provides digital gain control, timing recovery, equalization, digital peak detection, sequence detection, RLL(l,7) encoding and decoding, error-tolerant synchronization and chan... | 05/27/2008 |
| 7372650 | Rotating media storage device having a calibration track with unique calibration servo synch marks Disclosed is a rotating media storage device (RMSD) that has at least one calibration track with unique calibration servo synch marks (SSMcs). The RMSD includes a disk that comprises a plurality of tracks including a calibration track having a plurality o... | 05/13/2008 |
| 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 conversion part converting the reproduced signal into a first digital s... | 05/13/2008 |
| 7373575 | Method and apparatus for generating expect data from a captured bit pattern, and memory device using same Expect data signals are generated for a series of applied data signals having a known sequence to determine if groups of the data signals were properly captured. A first group of the applied data signals is captured, and a group of expect data signals are generated ... | 05/13/2008 |
| 7373565 | Start/stop circuit for performance counter A circuit for tracking a number of clock cycles between occurrences of an event of interest. The circuit includes logic for asserting a run signal responsive to a first occurrence of the event of interest, logic for deasserting the run signal responsive to a second ... | 05/13/2008 |
| 7370134 | System and method for memory hub-based expansion bus A system memory includes a memory hub controller, a memory module accessible by the memory hub controller, and an expansion module having a processor circuit coupled to the memory module and also having access to the memory module. The memory hub controller is coupl... | 05/06/2008 |
| 7365654 | Absolute angle detection apparatus In an absolute angle detection apparatus, sectors are obtained by dividing 360° by an even number, each sector having combinations of first and second code lines. The first code lines are Gray codes including third code lines that do not appear the same even when a... | 04/29/2008 |
| 7365929 | Synchronous servo channel for tape drive systems A fully synchronous servo channel for a data type drive is provided which includes the initial acquisition of synchronous servo channel parameters, generation of a timing basis for signal interpolation, generation of a tape velocity estimate and a y-position estimat... | 04/29/2008 |
| 7365671 | Communication channel with undersampled interpolative timing recovery Method and apparatus for processing transmitted data. A sampling circuit preferably performs lossy sampling of a continuous signal to provide a corresponding sequence of discrete samples at a sampling rate less than a Nyquist rate of the continuous signal. A process... | 04/29/2008 |
| 7366864 | Memory hub architecture having programmable lane widths A processor-based system includes a processor coupled to a system controller through a processor bus. The system controller is used to couple at least one input device, at least one output device, and at least one data storage device to the processor. Also coupled t... | 04/29/2008 |
| 7366244 | Method and system for antenna interference cancellation A wireless communication system can comprise two or more antennas that interfere with one another via free space coupling, surface wave crosstalk, dielectric leakage, or other interference effect. The interference effect can produce an interference signal on one of ... | 04/29/2008 |
| 7362957 | Reproducing apparatus A reproducing apparatus, in which a reproduced information signal is equalized by an equalizer, includes a detecting circuit for detecting a digital signal from the reproduced information signal, and a controller for controlling an equalizing characteristic of the e... | 04/22/2008 |
| 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 to extract information from the magnetic data storage medium utilizi... | 04/22/2008 |
| 7359133 | Magnetic recording medium and drive apparatus therefor A flexible recording medium, which has a track width in the range of approximately 1-3 μm, capable of facilitating good tracking control. A magnetic pattern bearing servo signals is provided on the guard bands formed on both sides of a data track of a magnetic reco... | 04/15/2008 |
| 7359621 | Recording apparatus An apparatus for recording second audio data on a recording medium on which first audio data including a plurality of first audio packets each containing audio information is recorded. One of the plurality of first audio packets is designated and the second audio da... | 04/15/2008 |
| 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 compares equalizer output signals to desired values that are based o... | 04/15/2008 |
| 7355805 | Magnetic tape and method of manufacturing magnetic tape, servo writer, and method of and apparatus for specifying servo band Data for specifying servo bands SB1 to SB5 is embedded in each servo signal S1 to S5 that is written on a plurality of servo bands SB1 to SB5 formed on a magnetic tape MT. ... | 04/08/2008 |
| 7355808 | Method and apparatus for partial self-servo writing using servo wedge propagation A method and apparatus for partial self-servo writing a disk surface in a disk drive using servo wedge propagation is provided. In one embodiment, servo information is written by a servo track writer near an outer diameter of the disk surface. The servo information ... | 04/08/2008 |
| 7356110 | Gain control method for a receiver of signals transmitted in bursts and receiver exploiting it The method is applicable to a receiver (1) of signals corresponding to packets of digital data transmitted in bursts, which comprises an analogue pickup subassembly (3) connected to a digital processing subassembly (8) by means for converting an... | 04/08/2008 |
| 7352824 | Multilevel pulse position modulation for efficient fiber optic communication Decreasing the average transmitted power in an optical fiber communication channel using multilevel amplitude modulation in conjunction with Pulse Position Modulation (PPM). This multilevel PPM method does not entail any tradeoff between decreased power per channel ... | 04/01/2008 |
| 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 identification field, a controller for controlling the position of a re... | 03/25/2008 |
| 7349172 | Certifying concentric data in eccentric servo data tracks of pre-formatted media Apparatus and method for rotating a data storage media having pre-formatted servo data tracks adjacent a data transfer member, and retrieving readback data with the data transfer member along a path that is non-concentric in relation to the servo data tracks. The da... | 03/25/2008 |
| 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 related servo functions, as software-based digital signal processing step... | 03/18/2008 |
| 7342735 | Method of writing patterns onto a recording disk, and data storage device Embodiments of the invention relate to writing servo patterns having aligned phases onto a recording disk in a process to write the servo patterns onto the disk. In one embodiment, time aligned patterns are written onto a magnetic disk on the basis of time intervals... | 03/11/2008 |
| 7342518 | Digital rate converter A method and apparatus of converting a data signal in a digital rate converter including upsampling the input data signal at an input sampling rate to an intermediate data signal at an intermediate sampling rate, where the intermediate data signal sample values are ... | 03/11/2008 |
| 7342965 | Adaptive method and system for mapping parameter values to codeword indexes A method and system for entropy coding, where parameters indicative of a coded signal are mapped into codeword indexes so that a decoder can reconstruct the coded signal from the codeword indexes. When the parameter space is limited such that the coding is inefficie... | 03/11/2008 |
| 7343243 | Fully automated vehicle dispatching, monitoring and billing A system for controlling vehicles (20) to provide transportation services without need for human intervention. A database (10) stores records each documenting needed transportation services. Processing circuitry (which may be one or several networked c... | 03/11/2008 |
| 7342875 | Space-time coded OFDM system for MMDS applications A communications system includes a base station that is configured to transmit a signal that is modulated according to a predetermined modulation scheme and an orthogonal frequency division multiplexing scheme, wherein the signal is encoded using space-frequency cod... | 03/11/2008 |
| 7339760 | Integrated bias and offset recovery amplifier A preamplifier circuit is connected to a transducing head, and has integrated bias circuitry and offset recovery circuitry. The offset recovery circuitry is activated in response to a transition from write mode to read more to provide an output signal representative... | 03/04/2008 |
| 7339761 | Method for wedge time shift calibration in a disk drive A method is disclosed for identifying wedge time shift zones on a magnetic disk of a disk drive. The disk drive further includes a spindle motor for rotating the disk at an operating speed in response to a spindle control current generated by a spindle control syste... | 03/04/2008 |
