Steven J Mclaughlin

US Patent:

6657933, Dec 2, 2003

Filed:

Jul 19, 2001

Appl. No.:

09/910464

Inventors:

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

Assignee:

Calimetrics, Inc. - Alameda CA

International Classification:

G11B 509

US Classification:

369 4735, 369 4725, 369 5915

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.

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.

US Patent:

62463462, Jun 12, 2001

Filed:

Oct 24, 1997

Appl. No.:

8/957763

Inventors:

Robert Leslie Cloke - Santa Clara CA
Patrick James Lee - San Jose CA
Steven William McLaughlin - Decatur GA

Assignee:

Western Digital Corporation - Lake Forest CA

International Classification:

H03M 500
H03M 700

US Classification:

341 59

Abstract:

A storage system employs a method for encoding a sequence of input data blocks into a sequence of codewords. Each input data block includes a first predetermined number of bits (the data block length). Each codeword includes a second predetermined number of bits (the codeword length). The code rate, i. e. , the ratio of the first number to the second number, is greater than 3/4. The method is performed in a sampled-data channel in a storage system; and the channel includes a circuit the performance of which is adversely affected by an excessive run length of bits between occurrences of a predetermined influential pattern. Preferably, the influential pattern is a two-bit sequence of adjacent 1's, which favorably influences the performance of a timing recovery circuit. The method includes receiving the sequence of input data blocks and generating the sequence of codewords responsive to the received sequence of input data blocks. The sequence of codewords has a constraint on the maximum run length of bits between occurrences of the influential pattern, the maximum run length of bits being less than or equal to the codeword length.