Steve Lynn Mclaughlin

US Patent:

6377529, Apr 23, 2002

Filed:

Jun 1, 2000

Appl. No.:

09/588101

Inventors:

David C. Lee - Guangdong, CN
Yi Ling - Foster City CA
Yung-Cheng Lo - San Leandro CA
Steve W. McLaughlin - Decatur GA

Assignee:

Calimetrics, Inc. - Alameda CA

International Classification:

G11B 390

US Classification:

369 591, 369 5333, 369 5922, 375232

Abstract:

A method is disclosed for compensating for intersymbol interference on an optical disc. The method includes measuring an intersymbol linear transfer function. The intersymbol linear transfer function substantially describes a linear portion of the effect of intersymbol interference on an optically detected read signal from an optical disc. A partial response target frequency response is divided by the intersymbol linear transfer function to obtain a linear equalization filter response. A read signal from the optical disc is convolved with the linear equalization filter response. This results in the read signal being equalized and containing a controlled partial-response target intersymbol interference. There is also disclosed a method of compensating utilizing a decision feedback equalizer where the target frequency response is either a partial-response or a zero-forcing response.