Method and device for controlling the rotating speed of a spindle of an optical disk drive through a wobble signal, an EEFS signal and an ESFS signal

A method for controlling rotational speed of a spindle in an optical disk drive, the method comprising:

• adjusting the rotational speed of the spindle according to a first control signal and a second control signal until the second control signal is steady with a fixed frequency difference between the first signal and the second signal;
• holding the second control signal to generate a fifth control signal according to a third control signal and the second control signal;
• and
• adjusting the rotational speed of the spindle in a write mode according to the first control signal, a fourth control signal, and the fifth control signal until a phase difference between the third signal and the fourth signal is less than a predetermined value.

A controller of an optical disk drive, the optical disk drive comprising a motor for controlling spin of a disk according to rotational speed of a corresponding spindle, the controller comprising:

• a frequency detector for deriving a first frequency difference between a wobble signal and an encoder EFM frame synchronization (EEFS) signal;
• a first phase detector for generating a first phase difference between the wobble signal and the EEFS signal;
• a second phase detector for generating a second phase difference between of an Absolute Time in Pre-groove (ATIP) sync signal and an encoder subcode frame sync (ESFS) signal;
• and
• a driving circuit for controlling the rotational speed of the spindle, wherein the driving circuit adjusts the rotational speed of the spindle according to the first frequency difference and the first phase difference until the first phase difference is substantially steady, and the driving circuit adjust the rotational speed of the spindle in a write mode according to the first frequency difference and the first phase difference, and a second phase difference between an Absolute Time in Pre-groove (ATIP) sync signal and an encoder subcode frame sync (ESFS) signal until the second phase difference is less than a pre-determined threshold.