Lsi Logic Corporation

Calimetrics, Inc.

Yi Ling

David C Lee

Steven Russel Spielman

Terrence L Wong

Jonathan A Zingman

Yung-Cheng Lo

Gregory Stephen Lewis

David Warland

Judith C Powelson

Stephen Pope

John L Fan

Richard L Martin

Laura L McPheters

Steven W McLaughlin

Steve W McLaughlin

Steven E McLaughlin

A system and method for reading and writing in a multilevel optical data system is disclosed. The system provides control signals for timing acquisition, level calibration, DC control, AGC, equalizer training and data synchronization. The user data is ECC protected and optionally convolutionally encoded before being combined with the control signals in an information block. The multilevel information block can be written to an optical disc as a series of multilevel marks. The optical disc may also contain an Address in Pregroove signal (AIP) to facilitate synchronization during writing of an information block. The AIP signal has an integer number of address frames per information block.

Method and format for reading and writing in a multilevel optical data systems

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.

Method and apparatus for reading and writing a multilevel signal from an optical disc oscillators

Method and format for reading and writing in a multilevel optical data system

Method and apparatus for reading and writing a multilevel signal from an optical disc

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.

Method for providing improved equalization for the reading of marks on optical data-storage media

Growing community of inventors

Foster City, CA, United States of America

Yi Ling