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US 6,816,447 B1Granted
Creation of synchronization marks in multilevel optical data storage
AssigneeLSI Logic Corporation
InventorsDavid C. Lee, Steven R. Spielman, Jonathan A. Zingman, Gregory S. Lewis
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Abstract
Creation and detection of synchronization marks for a multilevel data storage medium is disclosed. A sequence of symbols is generated and the sequence of symbols is written to the multilevel data storage medium. A corresponding sequence may be generated by a detector and correlated with read data to detect the synchronization mark.
Claims11
A method of creating a synchronization mark on a multilevel data storage medium comprising:
- generating a pseudo-noise sequence having a plurality of bits;
- converting each 0 bit of the pseudo-noise sequence to the lowest symbol that is
- written to the multilevel data storage medium;
- converting each 1 bit of the pseudo-noise sequence to the highest symbol that is written to the multilevel data storage medium;
- deriving a resulting sequence of symbols from the converted bits;
- and writing the resulting sequence of symbols to the multilevel data storage medium.
3 more elements
A data writing system for writing data to a multilevel data storage medium comprising:
- a pseudo-noise sequence generator for generating a pseudo-noise sequence having a plurality of bits;
- a processor configured to convert each 0 bit of the pseudo-noise sequence to the lowest symbol that is written to the multilevel data storage medium and to convert each 1 bit of the pseudo-noise sequence to the highest symbol that is written to the multilevel data storage medium;
- and
- a multiplexer configured to mix the resulting sequence of converted symbols with data from a data source.
1 more element
A multilevel optical storage disc comprising:
- multilevel marks that encode data;
- and
- synchronization marks determined by:
- generating a pseudo-noise sequence having a plurality of bits;
- converting each 0 bit of the pseudo-noise sequence to the lowest symbol that is written to the multilevel data storage medium;
- converting each 1 bit of the pseudo-noise sequence to the highest symbol that is written to the multilevel data storage medium;
- and
- deriving a resulting sequence of symbols from the converted bits.
5 more elements
Dependencies are inferred from the claim text.