Track determination
AssigneeMediatek Inc.
InventorsChih-Yuan Chen, Jin-Bin Yang, Ching-Ning Chiu
Life of this patent
Estimating the term…
Abstract
A light beam is scanned on a track of a recording medium, the track having a first track region and a second track region, each track region having a physical property that has recurring deviations. A wobble signal is derived from the light beam, the wobble signal having information associated with the recurring deviations. Whether the light beam is at the first track region or the second track region is determined based on a frequency, a period, or a pulse width of the wobble signal.
Claims18
A method for determining a position of an optical pick-up head emitting light on an optical disc in an optical disc drive, the optical disc comprising a pre-recorded region and a rewritable region, the method comprising:
- detecting at least two wobble signals when the optical disc is rotated at a same speed;
- obtaining a first parameter related to a first wobble signal and a second parameter related to a second wobble signal;
- comparing the first parameter and the second parameter with a first pre-stored threshold value and a second pre-stored threshold value;
- if the first parameter is larger than the first pre-stored threshold value, then it is determined that the light beam is at the pre-recorded region;
- and
- if the first parameter is smaller than the first pre-stored threshold value and the second parameter is smaller than the second pre-stored threshold value, then it is determined that the light beam is at the rewritable region.
An apparatus for determining a position of an optical pick-up head emitting light on an optical disc in an optical disc drive, the optical disc comprising a pre-recorded region and a rewritable region, the apparatus comprising:
- a detection circuit, detecting at least two wobble signals when the optical disc is rotated at a same speed, and obtaining a first parameter related to a first wobble signal and a second parameter related to a second wobble signal;
- and
- a determination circuit, comparing the first parameter and the second parameter with a first pre-stored threshold value and a second pre-stored threshold value, if the first parameter is larger than the first pre-stored threshold value, then determining that the light beam is at the pre-recorded region, and if the first parameter is smaller than the first pre-stored threshold value and the second parameter is smaller than the second pre-stored threshold value, then determining that the light beam is at the rewritable region.
Dependencies are inferred from the claim text.