Method and apparatus for reading and writing a multi-level signal from an optical disc
OwnerTerrence L. Wong, David C. Lee +2inventors
InventorsTerrence L. Wong, David C. Lee, Richard L. Martin, Steven R. Spielman
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Abstract
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.
Claims18
An amplitude modulation compensator comprising:
- an optical detector configured to read a raw analog data signal from a disc;
- a preliminary desnaker configured to preliminarily correct for amplitude modulation in the raw analog data signal to obtain a preliminarily corrected analog data signal;
- a timing recovery circuit configured to recover a timing signal from the preliminarily corrected analog data signal;
- and
- a clocked desnaker configured to correct for amplitude modulation of the raw analog data signal.
A method of reading a multilevel signal from an optical disc comprising:
- reading a raw analog data signal from a disc using an optical detector;
- preliminarily correcting for amplitude modulation in the raw analog data signal to obtain a preliminarily corrected analog data signal;
- recovering a timing signal from the preliminarily corrected analog data signal;
- and
- correcting for amplitude modulation of the raw analog data signal by processing the raw analog data signal and the timing signal.
A method of reading a multilevel signal from an optical disc comprising:
- reading a raw analog data signal from a disc using an optical detector;
- correcting for amplitude modulation of the raw analog data signal by processing the raw analog data signal to obtain an amplitude adjusted analog data signal;
- recovering a timing signal from the amplitude adjusted analog data signal;
- and
- using the timing signal to further correct for amplitude modulation in the amplitude adjusted analog data signal.
Dependencies are inferred from the claim text.