Judith C Powelson from Honolulu, HI, age 68

Us Patents

High Density Data Write Strategy
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US Patent:

6775218, Aug 10, 2004
Filed:

Aug 12, 1999
Appl. No.:

09/373916
Inventors:

Michael P. ONeill - Richmond CA
Terrence L. Wong - San Francisco CA
David K. Warland - Davis CA
Kunjithapatham Balasubramanian - Emeryville CA
Matthew C. Bashaw - Palo Alto CA
Timothy Learmonth - Berkeley CA
Gregory A. McDermott - Oakland CA
Raghuram Narayan - Alameda CA
Judith C. Powelson - Alameda CA
Ting Zhou - El Cerrito CA
Assignee:

LSI Logic Corporation - Milpitas CA
International Classification:

G11B 700
US Classification:

369 5911, 369 1327, 369 5912, 369116
Abstract:

A system and method are disclosed for recording information on a phase change medium is disclosed. The method includes irradiating a region of the phase change medium with a first dose of laser energy. A first portion of the region is irradiated with a second dose of laser energy in a manner that causes the first portion of the region irradiated with the second dose of laser energy to be in a different state than a second portion of the region that is not irradiated by the second dose of laser energy.

Digital Automatic Gain Control Of A Multilevel Optical Disc Read Signal
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US Patent:

6842410, Jan 11, 2005
Filed:

Apr 6, 2001
Appl. No.:

09/828311
Inventors:

Steven R. Spielman - Oakland CA, US
Yung-Cheng Lo - San Leandro CA, US
David C. Lee - Alameda CA, US
Judith C. Powelson - Alameda CA, US
Assignee:

LSI Logic Corporation - Milpitas CA
International Classification:

G11B 509
US Classification:

369 4727, 369 5331, 36912407, 3692753
Abstract:

A system and method are disclosed for providing a gain control signal for a multilevel read signal. In one embodiment, maximum automatic gain control marks are periodically inserted amongst a series of data fields. The automatic gain control marks include a series of high level marks such that the maximum signal detected in the interior portion of each maximum automatic gain control mark is not reduced by intersymbol interference. Minimum automatic gain control marks are also periodically inserted amongst a series of data fields. The automatic gain control marks include a series of high level marks such that the maximum signal detected in the interior portion of each minimum automatic gain control mark is not reduced by intersymbol interference. In another embodiment, multilevel signals are encoded to facilitate automatic gain control. The effect of a plurality of candidate merge symbols on the residual running total power associated with a current data block is determined.

Write Compensation For A Multi-Level Data Storage System
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US Patent:

6940790, Sep 6, 2005
Filed:

Feb 2, 2000
Appl. No.:

09/496898
Inventors:

Judith C. Powelson - Alameda CA, US
David K. Warland - Davis CA, US
Assignee:

LSI Logic Corporation - Milpitas CA
International Classification:

G11B005/09
US Classification:

369 4715, 369 4751, 369 5912
Abstract:

A system and method are disclosed for compensating during a data writing process for a transformation of input data by an optical disc data storage channel. A write strategy matrix is derived that maps a plurality of input sequences to a plurality of write strategy parameters. The input sequences each include a plurality of input data elements. When an input sequence is received, the write strategy matrix is used to determine in selected write strategy parameter that corresponds to the input sequence.

Write Compensation For Data Storage And Communication Systems
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US Patent:

6982939, Jan 3, 2006
Filed:

Nov 8, 2001
Appl. No.:

10/012257
Inventors:

Judith C. Powelson - Alameda CA, US
David K. Warland - Davis CA, US
Ian E. Harvey - Lake Forest CA, US
Yung-Cheng Lo - San Leandro CA, US
Christine Pepin - Menlo Park CA, US
Steven R. Spielman - Oakland CA, US
Ting Zhou - Albany CA, US
Jonathan A. Zingman - Oakland CA, US
Assignee:

LSI Logic Corporation - Milpitas CA
International Classification:

G11B 5/09
US Classification:

369 4753, 369 5326, 369 5334, 369 5912
Abstract:

Methods and systems for write compensation for optimizing the performance of a data storage or communication channel are disclosed. In one embodiment, a method comprises determining channel sensitivity to modifications in write signal parameters, detecting systematic errors in a read signal recovered from data written with a first set of write parameters, and adjusting the write signal parameters by an amount determined from the channel sensitivity such that the systematic errors are reduced when data are written with the adjusted write parameters.

Method And Apparatus For Reading And Writing A Multilevel Signal From An Optical Disc Oscillators
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US Patent:

7136333, Nov 14, 2006
Filed:

Feb 2, 2004
Appl. No.:

10/770261
Inventors:

Terrence L. Wong - San Francisco CA, US
John L. Fan - Palo Alto CA, US
David C. Lee - The Peak, HK
Yi Ling - Foster City CA, US
Yung-Cheng Lo - San Leandro CA, US
Steven E. McLaughlin - Decatur GA, US
Laura L. McPheters - Austin TX, US
Richard L. Martin - Berkeley CA, US
Judith C. Powelson - Alameda CA, US
Steven R. Spielman - Berkeley CA, US
David K. Warland - Davis CA, US
Jonathan A. Zingman - Oakland CA, US
Assignee:

LSI Logic Corporation - Milpitas CA
International Classification:

G11B 15/52
US Classification:

369 4719, 36912412
Abstract:

A system and method are disclosed for reading a multilevel signal from an optical disc. The method includes reading a raw analog data signal from a disc using an optical detector and adjusting the amplitude of the raw analog data signal. A timing signal is recovered from the amplitude adjusted analog data signal and correction is made for amplitude modulation of the raw analog data signal by processing the raw analog data signal and the timing signal.

Advanced High Density Data Write Strategy
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US Patent:

7301883, Nov 27, 2007
Filed:

Jun 12, 2002
Appl. No.:

10/171394
Inventors:

Kunjithapatham Balasubramanian - Orlando FL, US
Hans Henry Hieslmair - Oakland CA, US
Raghuram Narayan - Fremont CA, US
Judith C. Powelson - Alameda CA, US
Jason M. Stinebaugh - Berkeley CA, US
David K. Warland - Davis CA, US
Ting Zhou - Alameda CA, US
Assignee:

LSI Corporation - Milpitas CA
International Classification:

G11B 7/00
US Classification:

369116, 369 4751, 369 5911, 369 5912
Abstract:

A method of writing a mark to an optical disc includes receiving data to be written and generating a control signal for a laser pulse having a melt period that transitions to a growth period wherein the melt period is characterized by a melt power and the growth period is characterized by a growth power.

Digital Automatic Gain Control Of A Multilevel Optical Disc Read Signal
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US Patent:

7414942, Aug 19, 2008
Filed:

Nov 4, 2004
Appl. No.:

10/981327
Inventors:

Steven R. Spielman - Oakland CA, US
Yung-Cheng Lo - San Leandro CA, US
David C. Lee - Alameda CA, US
Judith C. Powelson - Alameda CA, US
Assignee:

LSI Corporation - Milpitas CA
International Classification:

G11B 20/10
US Classification:

369 5925, 369 5326
Abstract:

A system and method are disclosed for providing a gain control signal for a multilevel read signal. In one embodiment, maximum automatic gain control marks are periodically inserted amongst a series of data fields. The automatic gain control marks include a series of high level marks such that the maximum signal detected in the interior portion of each maximum automatic gain control mark is not reduced by intersymbol interference. Minimum automatic gain control marks are also periodically inserted amongst a series of data fields. The automatic gain control marks include a series of high level marks such that the maximum signal detected in the interior portion of each minimum automatic gain control mark is not reduced by intersymbol interference. In another embodiment, multilevel signals are encoded to facilitate automatic gain control. The effect of a plurality of candidate merge symbols on the residual running total power associated with a current data block is determined.

Advanced High Density Data Write Strategy
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US Patent:

7489609, Feb 10, 2009
Filed:

Sep 4, 2007
Appl. No.:

11/849580
Inventors:

Kunjithapatham Balasubramanian - Orlando FL, US
Hans Henry Hieslmair - Oakland CA, US
Raghuram Narayan - Fremont CA, US
Judith C. Powelson - Alameda CA, US
Jason M. Stinebaugh - Berkeley CA, US
David K. Warland - Davis CA, US
Ting Zhou - Alameda CA, US
Assignee:

LSI Logic Corporation - Milpitas CA
International Classification:

G11B 7/00
US Classification:

369 5911, 369 4751, 369 5916
Abstract:

A method of writing a mark to an optical disc includes receiving data to be written and generating a control signal for a laser pulse having a melt period that transitions to a growth period wherein the melt period is characterized by a melt power and the growth period is characterized by a growth power.