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Class Information
Number: 375/290
Name: Pulse or digital communications > Multilevel > Partial response
Description: Subject matter where the binary data rate is above the Nyquist rate (equal to twice the transmission bandwidth, and commonly regarded as the upper limit on the rate of binary data transmission) thereby dispersing the individual input pulses over more than one signalling interval.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7609778 |
Methods, apparatus, and systems for reducing interference on nearby conductors |
Oct. 27, 2009 |
| 7502427 |
Asynchronous servo RRO detection employing interpolation |
Mar. 10, 2009 |
| 7447278 |
Apparatus for transmitting and receiving data |
Nov. 4, 2008 |
| 7330513 |
Apparatus of transmitter and receiver for MIMO MC-CDMA system |
Feb. 12, 2008 |
| 7259929 |
Device and signal processing circuit for magnetic recording, magnetic recording apparatus |
Aug. 21, 2007 |
| 7167518 |
Bandwidth-efficient modulation in communication systems |
Jan. 23, 2007 |
| 7092462 |
Asynchronous servo RRO detection employing interpolation |
Aug. 15, 2006 |
| 7080311 |
Convolutional coding and decoding method and system |
Jul. 18, 2006 |
| 7072414 |
Gaussian minimum shift keying (GMSK) precoding communication method |
Jul. 4, 2006 |
| 7050493 |
Bandwidth-efficient modulation in communication systems |
May. 23, 2006 |
| 6751276 |
Method and apparatus for decoding a digital signal |
Jun. 15, 2004 |
| 6680980 |
Supporting ME2PRML and M2EPRML with the same trellis structure |
Jan. 20, 2004 |
| 6680978 |
Method and apparatus for nonlinear filtering and controlling the peak-to-average ratio |
Jan. 20, 2004 |
| 6636560 |
Increased bit rate of telephony modems using controlled intersymbol interface |
Oct. 21, 2003 |
| 6587520 |
Generation of amplitude levels for a partial response maximum likelihood (PRML) bit detector |
Jul. 1, 2003 |
| 6501812 |
Method for reading and demodulating data at different rates |
Dec. 31, 2002 |
| 6445754 |
Playback data detecting device |
Sep. 3, 2002 |
| 6385255 |
Coding system and method for partial response channels |
May. 7, 2002 |
| 6249398 |
Class of fixed partial response targets in a PRML sampled data detection channel |
Jun. 19, 2001 |
| 6246733 |
Synchronous interface for asynchronous data detection channels |
Jun. 12, 2001 |
| 6246731 |
Method and structure for increasing the maximum channel speed of a given channel |
Jun. 12, 2001 |
| 6246716 |
Information communication system |
Jun. 12, 2001 |
| 6151365 |
Information detecting apparatus and method |
Nov. 21, 2000 |
| 6119265 |
Viterbi decoding method and viterbi decoding apparatus capable of increasing error rate |
Sep. 12, 2000 |
| 5940449 |
Signal processing system for digital signals |
Aug. 17, 1999 |
| 5872668 |
Waveshaping circuit for shaping an analog waveform having unequal positive and negative peak levels so that the positive and negative peak levels are equal |
Feb. 16, 1999 |
| 5857002 |
PRML channel with EPR4 equalization and clocking |
Jan. 5, 1999 |
| 5854717 |
Self-synchronization in a magnetic recording channel utilizing time-domain equalization |
Dec. 29, 1998 |
| 5844741 |
System for reproducing high-density magnetic record data with viterbi detector for generating quadripartite reproduction data |
Dec. 1, 1998 |
| 5838738 |
Coding to improve timing recovery in a sampled amplitude read channel |
Nov. 17, 1998 |
| 5825824 |
DC-balanced and transition-controlled encoding method and apparatus |
Oct. 20, 1998 |
| 5774286 |
Magnetic disk drive in which read data is demodulated using maximum likelihood detection method |
Jun. 30, 1998 |
| 5774505 |
Intersymbol interference cancellation with reduced complexity |
Jun. 30, 1998 |
| 5768320 |
Read system for implementing PR4 and higher order PRML signals |
Jun. 16, 1998 |
| 5751506 |
Digital information reproducing apparatus using partial response detection method including quadruple processing |
May. 12, 1998 |
| 5696793 |
Phase difference detection circuit for extended partial-response class-4 signaling system |
Dec. 9, 1997 |
| 5689532 |
Reduced complexity EPR4 post-processor for sampled data detection |
Nov. 18, 1997 |
| 5671252 |
Sampled data read channel utilizing charge-coupled devices |
Sep. 23, 1997 |
| 5652541 |
Data demodulator employing decision feedback for reference parameter recovery and method used therin |
Jul. 29, 1997 |
| 5644595 |
Method and apparatus for an adaptive three tap transversal equalizer for partial-response signaling |
Jul. 1, 1997 |
| 5625505 |
Method of and apparatus for regenerating partial-response record signal |
Apr. 29, 1997 |
| 5619539 |
Data detection methods and apparatus for a direct access storage device |
Apr. 8, 1997 |
| 5557638 |
Transmission system for multivalued digital symbols |
Sep. 17, 1996 |
| 5548600 |
Method and means for generating and detecting spectrally constrained coded partial response waveforms using a time varying trellis modified by selective output state splitting |
Aug. 20, 1996 |
| 5521945 |
Reduced complexity EPR4 post-processor for sampled data detection |
May. 28, 1996 |
| 5521767 |
Optimized equalizer system for data recovery and timing extraction in partial response read channels |
May. 28, 1996 |
| 5506827 |
Digital data reproducing apparatus |
Apr. 9, 1996 |
| 5479445 |
Mode dependent serial transmission of digital audio information |
Dec. 26, 1995 |
| 5467370 |
Method and apparatus for an adaptive three tap transversal equalizer for partial-response signaling |
Nov. 14, 1995 |
| 5459757 |
Timing and gain control circuit for a PRML read channel |
Oct. 17, 1995 |
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