Back to results
US 6,665,243 B2Granted
Method and apparatus for recording a compact disc at a sub-1X speeds
AssigneeZoran Corporation
InventorsJohn Kelly, Daniel R. Salmonsen
Life of this patent
Estimating the term…
Abstract
A method and apparatus for sub-1× recording is described. The method of writing a mark on a compact disk (CD-R) medium spinning at a slow rate comprises varying the laser power between a write power and a read power while writing the mark, such that when read, the mark is read as a single mark.
Claims19
A method of writing a mark on a compact disk (CD-R) medium spinning at a sub-1× rate comprising:
- determining an actual speed of the compact disk;
- setting the high power level, the low power level, and a duty cycle for variation of the power level for the write;
- varying the laser power between the high power level and the low power level while writing the mark, such that the mark is read as a single mark.
A compact disk drive to write a mark on a compact disk (CD-R) medium spinning at a sub-1× rate comprising:
- a speed detector to determine an actual speed of the compact disk;
- a sub-1× strategy logic to set the high power level, the low power level, and a duty cycle for variation of the power level for the write;
- and
- a power level setting logic to vary the laser power between the first power level and the second lower power level while writing the mark, such that the mark is read as a single mark.
1 more element
A system to write at sub-1× speeds to a compact disk (CD-R), the system comprising:
- a power level setting logic to set a writing strategy that modulates laser power between a high level and a low level while each mark is written, the modulated writing forming a single mark;
- and
- a laser control logic to evaluate a plurality of marks written using the writing strategy, and further to adjust the laser power if the plurality of marks indicate that adjustment is needed.
Dependencies are inferred from the claim text.