| Patent Number |
Title Of Patent |
Date Issued |
| 6657936 |
Programmable write signal generator |
December 2, 2003 |
| A system and method are disclosed for generating a transition in a laser control signal at a precise point in time. A write strategy processor is configured to input a sequence of data and to determine a transition in a laser control signal from the sequence of data. The transition is |
| 6657933 |
Method and apparatus for reading and writing a multilevel signal from an optical disc |
December 2, 2003 |
| 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 |
| 6608807 |
Generating a multilevel calibration sequence for precompensation |
August 19, 2003 |
| A system and method are disclosed for generating a calibration sequence of multilevel symbols includes generating subsequences of digital values selected from a range of digital values using a maximal length shift register. The subsequences have a given subsequence length. The range of |
| 6604219 |
DC control of a multilevel signal |
August 5, 2003 |
| A system and method are disclosed for writing a multilevel data sequence to a storage medium so that a read signal generated by reading the multilevel data sequence from the storage medium will have reduced low frequency content is described. The method includes evaluating the effect of |
| 6504807 |
Programmable write signal generator |
January 7, 2003 |
| A system and method are disclosed for generating a transition in a laser control signal at a precise point in time. A write strategy processor is configured to input a sequence of data and to determine a transition in a laser control signal from the sequence of data. The transition is |
| 6396789 |
Data storage system and methods using diffractive near-field optics |
May 28, 2002 |
| An optical assembly suitable for use with an optical medium for the storage and retrieval of data, the optical assembly comprising: a source of illumination for providing a beam of optical radiation, an objective lens disposed in the optical path of the beam for redirecting the beam to t |
| 6385255 |
Coding system and method for partial response channels |
May 7, 2002 |
| A system and method for reading data to and writing data from multi-level (M-ary) partial response channels uses a trellis coder to encode an input bit stream sequence into a stream of multi-level data symbols. The data symbols are written to the partial response channel using any of a n |
| 6381724 |
Method and apparatus for modulation encoding data for storage on a multi-level optical recording |
April 30, 2002 |
| 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 |
| 6377529 |
Method for providing improved equalization for the reading of marks on optical data-storage medi |
April 23, 2002 |
| 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 |
| 6150964 |
M=10 (2,10), D=3.75 runlength limited code for multi-level data |
November 21, 2000 |
| A system for encoding digital data with an M-ary (d,k) code to provide multi-level coded data where M>2 comprises an M-ary (d,k) encoder for accepting digital input data. The M-ary (d,k) coder encodes the digital input data to produce a plurality of code symbols, where each code symbo |
| 6148428 |
Method and apparatus for modulation encoding data for storage on a multi-level optical recording |
November 14, 2000 |
| 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 |
| 6115348 |
Information storage systems utilizing media with optically-differentiated data sites |
September 5, 2000 |
| Storage density in an optical data storage media and system is increased many times the resolution limit by fully utilizing the much smaller detection limit by differentiating and isolating the active data sites in the media optically. The tracks are preordained and predisposed to a |
| 5818806 |
Method and apparatus for providing equalization for the reading of marks on optical data storage |
October 6, 1998 |
| 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 in |
