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| Number | Title | Issue Date |
| 7898756 | Disk drive adapting target values of a sequence detector relative to bit error rate of the 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 when reading a training data sequence recorded o... | 03/01/2011 |
| 7813067 | Accumulator for non-return to zero (NRZ) linear feedback shift register (LFSR) in controller for disk drive A disk controller for a hard disk drive includes a disk formatter interfaced via an NRZ bus to a read channel for the disk. The disk formatter includes an LFSR accumulator coupled to the NRZ bus, as well as an LSFR generator that generates synthetic test data for th... | 10/12/2010 |
| 7378994 | EFM/EFM+ encoder and method thereof An EFM/EFM+ encoder and a method thereof, performing digital sum value (DSV) protection in an Eight-to-Fourteen/Eight-to-Fourteen Plus (EFM/EFM+) encoding system to generate a data frame to be recorded on a recording medium. The method comprises modulating source da... | 05/27/2008 |
| 7317408 | Digital modulation apparatus and digital modulation method A digital modulation apparatus capable of generating a modulated code so that binary slice is correctly performed when reproducing is provided. To achieve this, in a digital modulation apparatus (10A), a DSV change amount calculator (15) calculates cha... | 01/08/2008 |
| 7304932 | Data recording medium, and data recording method and device A recording method for converting m-bit data into n-bit (where n>m) bit data whose run length is restricted and recoding the converted data on a recording medium, the recording method comprising the steps of when at least preceded data is data containing a special d... | 12/04/2007 |
| 7289046 | Data recording medium, data recording method and device, and encode method and device A recording method for converting m-bit data into n-bit (where n>m) data whose run length is restricted and recording the converted data on a recording medium, the recording method comprising the step of selecting first n-bit data according to an immediately precede... | 10/30/2007 |
| 7282838 | Electrical energy generator device with micro-fan array An electrical energy generator device comprising an array of micro-fans each associated to a respective dynamo-electric generator by means of a respective connecting shaft, further comprises, for at least some of the micro-fans (3), a lug element (6) a... | 10/16/2007 |
| 7236318 | Built in full speed nonreturn to zero test method and apparatus for a data storage device controller A data storage device such as a disc drive is described that has a controller chip with an integral embedded read/write channel on the chip. The chip includes a built in test capability for testing the controller logic via the device microprocessor and a nonreturn t... | 06/26/2007 |
| 7139142 | Determination of magnetic tape write quality employing write equalization transitions A signal sampler digitally samples magnetic signals detected by read head(s) of a magnetic tape drive, and a signal quality system extracts from the digital samples of a format required signal of the magnetic signals, such as a data set separator pattern, an estimat... | 11/21/2006 |
| 7136440 | Timing recovery for data sampling of a detector A partial response Class 4 detector in a recording and retrieval system and method of operating the detector for correcting the timing error of the detector. The detector includes a sequence table and comparison circuitry for comparing a sequence of data samp... | 11/14/2006 |
| 7016287 | Method and apparatus of modulating/demodulating data for an optical recording medium The present invention relates to method and apparatus for suppressing a DC component of coded sequence with no additional bit for suppressing a DC component, and for decoding the coded sequence. The present modulating method includes modulating the source data to a ... | 03/21/2006 |
| 7009532 | DVD recording method and rewritable DVD apparatus The DVD recording method is intended to increase the number of cycles allowed for recording on the disk an enormous number of times. This method comprises generating two data streams by using a plurality of code mapping variants prepared for coding input data, quasi... | 03/07/2006 |
| 6989777 | Simplified data recovery from high speed encoded data The present invention facilitates data recovery without requiring selection of a sample phase. The data is recovered by sampling a received signal to obtain a number of samples at a number of phases over a given time period referred to as a bit time. The samples are... | 01/24/2006 |
| 6985320 | Method and apparatus for encoding data to guarantee isolated transitions in a magnetic recording system Provided is a method, system, and program for storing input groups of uncoded binary data on a storage medium. A plurality of uncoded data blocks in a data stream are received. An encoded data stream is obtained from concatenating successive encoded blocks such that... | 01/10/2006 |
| 6914948 | Media noise post-processor with varying threshold A post-processing method and circuit (30) for correcting media noise errors and producing a corrected recovered data output signal (49) is disclosed for use in a sampled data read channel of a mass data storage device. The mass data storage device has ... | 07/05/2005 |
| 6861965 | Code modulating method and code modulating apparatus, demodulating method and demodulating apparatus, and information recording medium In a code modulating method and a code modulating apparatus, a run length has an encoding rate of ⅔ which is equal to that of (1, 7) modulation, and indicates the number of “0” bits between adjacent ones of “1” bits in the channel bit train. A data bit tra... | 03/01/2005 |
| 6831797 | Programmable write equalization circuit A programmable write equalization circuit includes a first digital clock that is used as a reference to indicate data rate, a second digital clock used to indicate write equalization quantization, a look-up table used to store waveforms used in equalizing the input ... | 12/14/2004 |
| 6737996 | Information recording and reproducing method Disclosed is a method for satisfying both high reliability and low error rate when in recording and reproducing information by making the average run length of the RLL code for recording a crystal state shorter than that for recording an amorphous state on a recordi... | 05/18/2004 |
| 6693981 | Method and apparatus for identifying bit rate A signal received in a wavelength division multiplexing system is delayed and an exclusive OR logical operation is performed on the received signal and the delayed received signal. Then, the direct current voltage of a selection signal which is a result o... | 02/17/2004 |
| 6677866 | Modulation apparatus/method, demodulation apparatus/method and program presenting medium How to record and play back data at a high line density. A DSV control bit determining/inserting unit 11 inserts DSV control bits for execution of DSV control into an input data string and outputs the data string including the DSV control bits to a modula... | 01/13/2004 |
| 6604223 | System and method for correcting interference errors in data encoded on storage media A system and method for correcting interference errors in data encoded on storage media comprising position marks disposed on a storage medium, the position marks being configured to encode a plurality of track addresses and at least four track types. A c... | 08/05/2003 |
| 6496541 | Modulation apparatus/method, demodulation apparatus/method and program presenting medium A DSV control bit determining/inserting unit inserts DSV control bits into an input data string and outputs the string including the DSV control bits to a modulation unit which converts the string with basic data length of 2 bits into variable length code... | 12/17/2002 |
| 6429986 | Data storage to enhance timing recovery in high density magnetic recording A timing recovery system encodes data while impressing recognizable patterns thereon, enabling precise timing during subsequent readback operations. An uncoded binary sequence is encoded using an m/n rate block coded sequence, incorporating a unique prede... | 08/06/2002 |
| 6397276 | Data transmission by an alternating-frequency analog signal The present invention provides for the compression of digital and analog data for storage and transmission. Analog data in the form of an analog signal is converted into a digital signal by an analog-to-digital converter. The digital signal is then conver... | 05/28/2002 |
| 6384996 | Insertion of ones and zeroes into I-NRZI modulation for magnetic recording apparatus to facilitate head tracking In digital signal recording apparatus using I-NRZI modulation for recording, the need for intermittently reading or intermittently writing buffer storage is eliminated by using parallel-bit precoding to generate the channel words that are selected between... | 05/07/2002 |
| 6363122 | Coding apparatus and decoding apparatus In order to implement encoding which is proof against noise and distortion, there is provided an encoder for coding a train of input codes characterized in that 3 consecutively transiting consistent codes starting from either an odd-numbered or an even-nu... | 03/26/2002 |
| 6359744 | Reducing thermal decay of data signals recorded on magnetic media A data storage device 15 comprises a recording head 35 and a recording media comprising a layer of magnetic material having an anisotropy that is substantially perpendicular to a plane of the layer. The device encoder 80 is adapted to provide an encoded d... | 03/19/2002 |
| 6320711 | High-speed unified data interface for a read channel in a disk drive system The invention provides a high-speed interface that transfers user data and other data over a single unified interface between a read channel integrated circuit and another integrated circuit, such as the drive control integrated circuit. The high-speed in... | 11/20/2001 |
| 6233715 | Synchronous servo gray code detector using a PR4 matched filter This invention relates to improvements in servo Gray code detection techniques in rotating data storage drives such as hard disk drives, or the like. The detection technique uses a rate 1/4 Gray code servo signals equalized to a PR4 target, and a matched ... | 05/15/2001 |
| 6218907 | Frequency comparator and PLL circuit using the same A frequency comparator for comparing the frequency of a predetermined clock signal with the clock frequency of a non-return-to-zero (NRZ) signal having a detector circuit for detecting a data change of the NRZ signal in an interval of one time period of t... | 04/17/2001 |
| 6104765 | Asymmetric channel data detection compensation A data symbol sequence detector for choosing data symbol sequences likely to be represented by corresponding sequences of samples received by the detector with these sample sequences formed by sampling data signals obtained from magnetically stored data t... | 08/15/2000 |
| 6091556 | Data recording and reproducing apparatus using two orthogonal code streams A data recording device such as a hard disk apparatus has an orthogonal coding circuit and a modulation circuit. The orthogonal coding circuit encodes recording data to be recorded to adjacent two tracks as two orthogonal code streams which are included i... | 07/18/2000 |
| 6081395 | Apparatus and method for generating a digital tracking signal with a frequency spectrum corresponding to one or more n-bit words A signal recording apparatus for a video instrument using a magnetic recording medium which is capable of more accurately computing the signal to be recorded on the tape by correcting the output signal when affixing "1" or "0" after computing the output s... | 06/27/2000 |
| 6052248 | Parity channel code for enhancing the operation of a remod/demod sequence detector in a d=1 sampled amplitude read channel A sampled amplitude read channel is disclosed for disk storage systems employing a run-length limited (RLL) d=1 channel code which compensates for partial erasure, and a parity channel code for enhancing the operation of a remod/demod sequence detector. D... | 04/18/2000 |
| 6023384 | Data recording device and control apparatus for recording data twice on one track using different encoding methods A magnetic disk drive includes redundant data written at a plurality of out of phase angular locations to reduce the latency and enhance performance during a read operation. The loss of recording capacity is reduced by increasing the data density to achie... | 02/08/2000 |
| 5961658 | PR4 equalization and an EPR4 remod/demod sequence detector in a sampled amplitude read channel A sampled amplitude read channel is disclosed for disk storage systems that employs an EPR4 remod/demod sequence detector. To reduce the complexity of timing recovery, gain control and adaptive equalization, the channel samples are initially equalized int... | 10/05/1999 |
| 5923629 | Magnetic recording encoder system for a (1,7) channel having a 2/3 coding rate An improvement in a system for encoding a data field on a disk with write gate data. The system has an encoder and a data receiving controller for directing write gate data in the form of 0 and 1 bits to the encoder. The encoder, in response to the write ... | 07/13/1999 |
| 5912869 | Recording medium data transmission method and apparatus and data reproduction method and apparatus A data transmission apparatus for transmitting an original data has a converter for converting the original data to sequential data codes. The data code is formed by a combination of HIGH level binary codes and LOW level binary codes. The maximum length o... | 06/15/1999 |
| 5898531 | Signal processing apparatus for digitally modulating input data Input data is modulated, a two-valued signal regarding a signal of a specific frequency is generated, and a logical arithmetic operation between the modulation data and the two-valued signal is executed. In accordance with the result of the logical arithm... | 04/27/1999 |
| 5877712 | I-NRZI modulator using parallel-bit-word at precoder, as for inclusion in magnetic recording apparatus In digital signal recording apparatus using I-NRZI modulation for recording, the need for intermittently reading or intermittently writing buffer storage is eliminated by using parallel-bit preceding to generate the channel words that are selected between... | 03/02/1999 |
