| Patent Number |
Title Of Patent |
Date Issued |
| 7378994 |
EFM/EFM+ encoder and method thereof |
May. 27, 2008 |
| 7317408 |
Digital modulation apparatus and digital modulation method |
Jan. 8, 2008 |
| 7289046 |
Data recording medium, data recording method and device, and encode method and device |
Oct. 30, 2007 |
| 7265690 |
Simplified data recovery from high speed encoded data |
Sep. 4, 2007 |
| 7236318 |
Built in full speed nonreturn to zero test method and apparatus for a data storage device controller |
Jun. 26, 2007 |
| 7139142 |
Determination of magnetic tape write quality employing write equalization transitions |
Nov. 21, 2006 |
| 7009532 |
DVD recording method and rewritable DVD apparatus |
Mar. 7, 2006 |
| 6985320 |
Method and apparatus for encoding data to guarantee isolated transitions in a magnetic recording system |
Jan. 10, 2006 |
| 6861965 |
Code modulating method and code modulating apparatus, demodulating method and demodulating apparatus, and information recording medium |
Mar. 1, 2005 |
| 6831797 |
Programmable write equalization circuit |
Dec. 14, 2004 |
| 6737996 |
Information recording and reproducing method |
May. 18, 2004 |
| 6693981 |
Method and apparatus for identifying bit rate |
Feb. 17, 2004 |
| 6677866 |
Modulation apparatus/method, demodulation apparatus/method and program presenting medium |
Jan. 13, 2004 |
| 6604223 |
System and method for correcting interference errors in data encoded on storage media |
Aug. 5, 2003 |
| 6496541 |
Modulation apparatus/method, demodulation apparatus/method and program presenting medium |
Dec. 17, 2002 |
| 6429986 |
Data storage to enhance timing recovery in high density magnetic recording |
Aug. 6, 2002 |
| 6397276 |
Data transmission by an alternating-frequency analog signal |
May. 28, 2002 |
| 6384996 |
Insertion of ones and zeroes into I-NRZI modulation for magnetic recording apparatus to facilitate head tracking |
May. 7, 2002 |
| 6363122 |
Coding apparatus and decoding apparatus |
Mar. 26, 2002 |
| 6359744 |
Reducing thermal decay of data signals recorded on magnetic media |
Mar. 19, 2002 |
| 6320711 |
High-speed unified data interface for a read channel in a disk drive system |
Nov. 20, 2001 |
| 6233715 |
Synchronous servo gray code detector using a PR4 matched filter |
May. 15, 2001 |
| 6218907 |
Frequency comparator and PLL circuit using the same |
Apr. 17, 2001 |
| 6104765 |
Asymmetric channel data detection compensation |
Aug. 15, 2000 |
| 6091556 |
Data recording and reproducing apparatus using two orthogonal code streams |
Jul. 18, 2000 |
| 6081395 |
Apparatus and method for generating a digital tracking signal with a frequency spectrum corresponding to one or more n-bit words |
Jun. 27, 2000 |
| 6052248 |
Parity channel code for enhancing the operation of a remod/demod sequence detector in a d=1 sampled amplitude read channel |
Apr. 18, 2000 |
| 6023384 |
Data recording device and control apparatus for recording data twice on one track using different encoding methods |
Feb. 8, 2000 |
| 5961658 |
PR4 equalization and an EPR4 remod/demod sequence detector in a sampled amplitude read channel |
Oct. 5, 1999 |
| 5923629 |
Magnetic recording encoder system for a (1,7) channel having a 2/3 coding rate |
Jul. 13, 1999 |
| 5912869 |
Recording medium data transmission method and apparatus and data reproduction method and apparatus |
Jun. 15, 1999 |
| 5898531 |
Signal processing apparatus for digitally modulating input data |
Apr. 27, 1999 |
| 5877712 |
I-NRZI modulator using parallel-bit-word at precoder, as for inclusion in magnetic recording apparatus |
Mar. 2, 1999 |
| 5852520 |
Data conversion method, pilot signal formation method using the same rotary magnetic head device for use therein |
Dec. 22, 1998 |
| 5825567 |
Apparatus for recording digital signals by controlling frequency characteristics of digital signals utilizing bit extraction and interleaved NRZI molulation |
Oct. 20, 1998 |
| 5815334 |
Digital signal detector for correcting signals of a magnetic recording/reproducing device |
Sep. 29, 1998 |
| 5805632 |
Bit rate doubler for serial data transmission or storage |
Sep. 8, 1998 |
| 5786950 |
PR4 sampled amplitude read channel employing an NRZI write modulator and a PR4/NRZI converter |
Jul. 28, 1998 |
| 5745312 |
Calculating, at rate faster than I-NRZI modulation clock rate, ones and zeroes for insertion into I-NRZI modulation |
Apr. 28, 1998 |
| 5708536 |
RLL to NRZ decoder circuit in disk drive read/write channel |
Jan. 13, 1998 |
| 5689692 |
Method and apparatus for decoding an encoded NRZ signal |
Nov. 18, 1997 |
| 5642241 |
Digital signal recording apparatus in which interleaved-NRZI modulated is generated with a lone 2T precoder |
Jun. 24, 1997 |
| 5638064 |
Digital modulating/demodulating method and apparatus using same |
Jun. 10, 1997 |
| 5633770 |
Digital output magnetoresistive (DOMR) head and methods associated therewith |
May. 27, 1997 |
| 5579182 |
Apparatus for recording digital signals superposed with controlled frequency components |
Nov. 26, 1996 |
| 5557481 |
NRZ to RLL encoder circuit in disk drive read/write channel |
Sep. 17, 1996 |
| 5546427 |
Method and apparatus for digital code resynchronization in data encoding/decoding |
Aug. 13, 1996 |
| 5432651 |
Data conversion device and recording/reproduction apparatus |
Jul. 11, 1995 |
| 5399995 |
CMOS circuit providing 90 degree phase delay |
Mar. 21, 1995 |
| 5349350 |
Run length limited encoding/decoding system for low power disk drives |
Sep. 20, 1994 |
