CLV system and method using PSA lookup
AssigneeDPHI Acquisitions, Inc.
InventorsCharles R. Watt, Christopher J. Turner
Life of this patent
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Abstract
A system and method for controlling operation of a motor system that addresses the design challenges for the small form factor optical disk system. The control system can be operable to read a physical sector address (PSA) from an optical medium, calculate a table index based on the PSA, enter a lookup table module to acquire reference data, and maintain a constant data rate transfer from the optical medium for a range of PSAs.
Claims17
A method for controlling the spin speed of motor, said method comprising:
- receiving a physical sector address (PSA) value and recording a current time of receipt;
- determining a time difference between the time of receipt and a previous time of receipt;
- if the time difference is less than a maximum time difference, entering a database using a table index based on said PSA value;
- and
- providing reference data from said database corresponding to said table index to provide an output for providing a control effort.
A method for controlling spin velocity of an optical medium comprising:
- reading a physical sector address (PSA) from an optical medium;
- detecting an age of said PSA by comparing a first time stamp for said PSA to the present time;
- if the age is less than a maximum age, calculating a table index based on said PSA;
- entering a lookup table module to acquire reference data;
- and
- maintaining a constant data rate transfer from said optical medium for a range of PSAs.
A system for controlling spin velocity of an optical medium comprising:
- means for reading a physical sector address (PSA) from an optical medium;
- means for calculating a table index based on said PSA;
- means for detecting an age of said PSA by comparing a time stamp for said PSA to a present time;
- means for entering a lookup table module to acquire reference data;
- and
- means for maintaining a constant data rate transfer from said optical medium for a range of PSAs.
Dependencies are inferred from the claim text.