Did You Know...
...that while attempting to develop a super strong glue, 3M employee Spencer Silver accidentally developed a glue that was so weak it would barely hold two pieces of paper together? However, his colleague Art Fry needed the glue. Fry sang with his church choir and marked the pages of his hymnal with small scraps of paper that often fell out. He used Silver's glue to hold the papers in place. Today we call this invention Post-it Notes.
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| Number | Title | Issue Date |
| 8174786 | Equalization and detection Devices, systems, and techniques for equalization include, in at least some implementations, a first equalizer that produces first equalized data responsive to input data by reducing a total power of both noise and inter symbol interference components of the input d... | 05/08/2012 |
| 8154815 | Systems and methods for generating equalization data using shift register architecture Various embodiments of the present invention provide systems and methods for data equalization. For example, various embodiments of the present invention provide methods for generating equalization data. The method includes inputting N bits of an equalization data p... | 04/10/2012 |
| 8149530 | Methodology for equalizing systemic latencies in television reception in connection with games of skill played in connection with live television programming A method of and system for handling latency issues encountered in producing real-time entertainment such as games of skill synchronized with live or taped televised events is described herein. There are multiple situations that are dealt with regarding latencies in ... | 04/03/2012 |
| 8144415 | Apparatus, signal-processing circuit and device for magnetic recording system To effectively suppress a signal in a low frequency region in which the medium noise and the signal distortion are concentrated, and in order to effectively utilize a detected component of the reproduced signal in the low frequency region, a target of partial respon... | 03/27/2012 |
| 8139305 | Systems and methods for timing and gain acquisition Various embodiments of the present invention provide systems and methods for acquiring timing and/or gain information. For example, various embodiments of the present invention provide data processing circuits that include a sample splitting circuit, a first averagi... | 03/20/2012 |
| 8130462 | Decoupling magneto-resistive asymmetry and offset loops Signal correction is performed by determining an offset error based at least in part on a first portion of a signal within a first amplitude range. The offset error is associated with error due to offset in the signal. An signal error, associated with error due to o... | 03/06/2012 |
| 8120870 | Asymmetry correction in read signal Systems and techniques associated with signal processing are described. A described technique includes generating asymmetry vectors that model asymmetry in a received analog signal, including an effect of asymmetry spreading in a read channel and selecting at least ... | 02/21/2012 |
| 8094400 | Asymmetry correction in read signal Systems and techniques relating to interpreting signals on a channel having an asymmetrical signal amplitude response include an integrated circuit device including: an input to receive digital data corresponding to an asymmetry corrected analog signal of a read cha... | 01/10/2012 |
| 8077419 | Method and apparatus for adjusting a gain of a variable gain amplifier in a read channel module A read-channel module including a VGA module to amplify a signal based on a variable gain, an ADC module to generate a sample based on the amplified signal, and an AGC module to control the variable gain of the VGA module. A gain adjusting module generates (i) a fir... | 12/13/2011 |
| 7990648 | Disk drive margining read channel using predictable disturbance samples generated as a function of a written pattern A disk drive is disclosed comprising a head actuated over a disk having a plurality of tracks. A pattern is read from the disk to generate a read signal, and the read signal is sampled to generate read samples. Predictable disturbing samples are generated as a funct... | 08/02/2011 |
| 7982997 | Method for an equalizer computation in a media system using a data set separator sequence Provided is a method for receiving a DSS sequence and a DSS readback sequence, which is a function of a channel processing of the DSS sequence by a read channel. A coefficient cyclic equalizer vector is generated as a function of the DSS sequence and the DSS readbac... | 07/19/2011 |
| 7974037 | Techniques for providing DC-free detection of DC equalization target A data storage device includes a first filter that generates a short DC equalization target in response to a read back signal generated from magnetic patterns that are recorded on a storage medium using perpendicular recording. The data storage device also includes ... | 07/05/2011 |
| 7965467 | Systems and methods for generating equalization data Various embodiments of the present invention provide systems and methods for using data equalization. For example, various embodiments of the present invention provide storage devices that include a semiconductor device having an equalization unit and a digital-to-a... | 06/21/2011 |
| 7965466 | Equalization and detection Systems, methods and devices for equalization include a first adaptive equalizer to process read data or write data to respectively produce equalized read data or write data; a first detector to detect the equalized read data or the equalized write data to respectiv... | 06/21/2011 |
| 7948702 | Systems and methods for controlling data equalization Various embodiments of the present invention provide systems and methods for performing data equalization. For example, various embodiments of the present invention provide data equalization circuits that include an equalization circuit and a transition adjustment c... | 05/24/2011 |
| 7944639 | Disk drive adapting equalizer relative to bit error rate of sequence detector A disk drive is disclosed comprising a disk and a head actuated radially over the disk, wherein the head generates a read signal. A sampling device samples the read signal to generate a sequence of read signal samples, and an equalizer comprising a plurality of coef... | 05/17/2011 |
| 7924524 | System and method for generating an amplitude error signal in a magnetic tape recording channel A method according to one embodiment includes generating a first gain error, comprising: receiving an output of an equalizer; and comparing a magnitude of the output to a saturation threshold level; if the output is higher than the saturation threshold level, genera... | 04/12/2011 |
| 7924523 | Frequency domain approach for efficient computation of fixed-point equalization targets Various embodiments of the present invention provide systems and methods for equalizing an input signal. For example, various embodiments of the present invention provide a method for performing equalization in a storage device. Such methods include providing an equ... | 04/12/2011 |
| 7898760 | Magnetic spacing and tape characteristic compensation system and method A magnetic head according to one embodiment includes a reader and a thermal sensor for detecting a thermal effect thereon from a magnetic medium passing by the thermal sensor. A tape drive system according to one embodiment includes a magnetic head for reading data ... | 03/01/2011 |
| 7885031 | Asymmetry correction in read signal Systems and techniques relating to interpreting signals on a channel having an asymmetrical signal amplitude response. A signal processor, such as a read channel transceiver device usable in a magnetic recording system, includes an asymmetry correction circuit confi... | 02/08/2011 |
| 7885030 | Methods and systems for delay compensation in global PLL-based timing recovery loops A system in one embodiment includes a global PLL circuit comprising multiple inputs, each input being for receiving an error signal associated with an individual channel; and a delay compensation circuit coupled to the global PLL circuit. A method in one embodiment ... | 02/08/2011 |
| 7852589 | Disk drive Embodiments in accordance with the present invention provide a magnetic disk drive capable of achieving error recovery stably in a simple configuration in the event of thermal asperity (TA) and minimizing the error recovery time required, and a method for controllin... | 12/14/2010 |
| 7848042 | Decoupling magneto-resistive asymmetry and offset loops Removing magneto-resistive asymmetry (MRA) from a signal is disclosed. Removing MRA includes determining an estimated offset error associated with error due to offset in the signal, determining an estimated signal error associated with error due to offset and MRA in... | 12/07/2010 |
| 7821733 | Using a measured error to determine coefficients to provide to an equalizer to use to equalize an input signal Provided are a read channel, storage drive and method using a measured error to determine coefficients to provide to an equalizer to use to equalize an input signal. A read channel is incorporated in a storage device to process signals read from a storage medium. An... | 10/26/2010 |
| 7817366 | Gain adjustment before zero phase start A read-channel module includes a variable-gain amplifier (VGA) module, an analog-to-digital converter (ADC) module, an amplitude measuring module, a gain adjusting module, and a zero phase start (ZPS) module. The VGA module has a variable gain, amplifies input signa... | 10/19/2010 |
| 7817367 | Apparatus, signal-processing circuit and device for magnetic recording system To effectively suppress a signal in a low frequency region in which the medium noise and the signal distortion are concentrated, and in order to effectively utilize a detected component of the reproduced signal in the low frequency region, a target of partial respon... | 10/19/2010 |
| 7817368 | Asymmetry correction in read signal Systems and techniques relating to interpreting signals on a channel having an asymmetrical signal amplitude response can include generating multiple asymmetry matrices that model asymmetry in a received analog signal, including an effect of asymmetry spreading in a... | 10/19/2010 |
| 7791830 | Signal processing circuit and magnetic storage apparatus A signal processing circuit performs processing for an analog signal output from a head. The signal processing circuit includes: a conversion section that generates a digital signal based on the analog signal; a first filter that equalizes the output of the conversi... | 09/07/2010 |
| 7768732 | Gain controller for a gain loop of a read channel and related gain loops, read channels, systems, and methods A gain controller for a gain loop of a read channel includes a comparator circuit, an accumulator circuit, and a function circuit. The comparator circuit determines an error between an actual sample of a read signal and a corresponding ideal sample of the read signa... | 08/03/2010 |
| 7733593 | Write channel equalization level control in magnetic recording device A magnetic recording device write channel includes a write equalization encoder for generating a write equalization level signal and a digital to analog converter for converting the write data signal to analog signals for recording. The write equalization level sign... | 06/08/2010 |
| 7684139 | 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... | 03/23/2010 |
| 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 properties of a PN (Pseudo-Noise) sequence to approximate a PN deconvolution... | 01/05/2010 |
| 7589927 | Dynamically adapting a read channel equalizer Provided is a read channel incorporated in a storage device to process signals read from a storage medium. The read channel includes an equalizer equalizing input read signals to produce equalizer output signals. A detector senses an adjusted equalizer output signal... | 09/15/2009 |
| 7548389 | Asymmetry correction in read signal Systems and techniques relating to interpreting signals on a channel having an asymmetrical signal amplitude response. A signal processor, such as a read channel transceiver device usable in a magnetic recording system, includes an asymmetry correction circuit confi... | 06/16/2009 |
| 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 reproducing section for reproducing the information signal recorded in th... | 05/12/2009 |
| 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 medium. An equalizer receives asynchronous input read signals and shapes ... | 04/21/2009 |
| 7511910 | Asymmetry correction in read signal Systems and techniques relating to interpreting signals on a channel having an asymmetrical signal amplitude response. A signal processor, such as a read channel transceiver device usable in a magnetic recording system, includes an asymmetry correction circuit confi... | 03/31/2009 |
| 7502189 | Apparatus, signal-processing circuit and device for magnetic recording system To effectively suppress a signal in a low frequency region in which the medium noise and the signal distortion are concentrated, and in order to effectively utilize a detected component of the reproduced signal in the low frequency region, a target of partial respon... | 03/10/2009 |
| 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 (e.g., a Viterbi detector) responsive to a readback signal and operable ... | 03/03/2009 |
| 7480110 | Medium dependent write equalization A medium dependent write equalization method is disclosed. The method includes identifying a trait of a magnetic medium. A characteristic of a write equalization signal is then defined according to the identified trait of the magnetic medium. ... | 01/20/2009 |
