Calimetrics, Inc.

Lsi Logic Corporation

Other

Lsi Corporation

Terrence L Wong

Steven Russel Spielman

David C Lee

David Warland

Jonathan A Zingman

Yi Ling

Judith C Powelson

Richard L Martin

Gregory Stephen Lewis

Michael P O'Neill

Yung-Cheng Lo

Gregory A McDermott

Lloyd R Welch

Stephen Pope

John L Fan

Steve W McLaughlin

Laura L McPheters

Ting Zhou

Steven W McLaughlin

Timothy Learmonth

Matthew Charles Bashaw

Raghuram Narayan

Ian E Harvey

Kunjithapatham Balasubramanian

Greg S Lewis

Christopher C Tan

Steven E McLaughlin

Cezary Pietrzyk

Bruce V Johnson

Securely storing data to an optical disc has been described, including generating write data that includes the data and overhead data that facilitates reading the data from the disc; and configuring the overhead data according to a key.

Secure data storage

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

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.

High density data write strategy

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 system and method are disclosed for modulation encoding data for storage or transmission on a multilevel medium. The method includes encoding a first portion of data using a first tier modulation code. The first tier modulation code maps a first portion of the data onto a first set of symbols. A second portion of data is encoded using a second tier modulation code. The second tier modulation maps the second portion of the data onto a second set of symbols. The second tier modulation code has error correcting characteristics. A third set of symbols is determined based on the first set of symbols and the second set of symbols. The third set of symbols is suitable to determine nominal read signal levels from a multilevel medium. Improved error characteristics are realized for encoding data for storage or transmission on a multilevel medium.

Method and apparatus for modulation encoding data for storage on a multi-level optical recording medium

Method and apparatus for reading and writing a multi-level signal from an optical disc

Method and apparatus for modulation encoding data for storage on a

The present invention is a system for reading a CD having a surface with a multiple level data track including a laser, a focusing and positioning system configured in a way which causes the laser to follow the multiple level data track, a detector which converts the light which is reflected from the data track to an electrical signal, a digital signal processing unit configured to receive the electrical signal including a scaling-function generator for determining a plurality of signal windows from the electrical signal, and a multiple level analog to digital converter which determines a data level based on the signal windows and the electrical signal whereby multiple data levels may be read from the CD.

Optical disc reader for reading multiple levels of pits on an optical

A system and method are 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. The intersymbol linear transfer function is convolved with a write signal to produce a linearly transformed portion of the optically detected read signal. An inverse linear transfer function of the intersymbol linear transfer function is determined. The inverse linear transfer function has the property of canceling the effect of convolving the intersymbol linear transfer function with the write signal. The optically detected read signal is convolved with the inverse linear transfer function. Thus, the linear portion of the effect of intersymbol interference on an optically detected read signal from an optical disc is canceled by the convolution of the optically detected read signal with the inverse linear transfer function.

Method and apparatus for providing equalization for the reading of marks

Growing community of inventors

San Francisco, CA, United States of America

Terrence L Wong