Patent ID: 7272093

Claim:
A control circuit for controlling an optical disk drive, the control circuit comprising: a frequency detector for receiving an eight-to-fourteen modulation (EFM) signal and a data phase-locked loop (DPLL) signal; a phase detector for receiving the EFM signal and the DPLL signal; a low pass filter connected to the frequency detector and the phase detector for receiving outputs from the frequency detector and the phase detector and for outputting a first control signal; a voltage-controlled oscillator (VCO) connected to the low pass filter for receiving the first control signal and for outputting the DPLL signal; and a controller for monitoring the DPLL signal and for outputting a second control signal to the VCO; wherein the controller is capable of calculating a target frequency and outputs the second control signal to the VCO to cause the VCO to output the DPLL signal according to the target frequency; and the controller determines the target frequency by referencing a track number and a media type.