Abstract: A method for optical drive decoding of address in pre-groove (ADIP) data is provided to decode an input wobble signal to an ADIP unit signal. The method includes generating a wobble carrier frequency signal having the same phase with the wobble signal, multiplying the wobble carrier frequency signal by the input wobble signal to generate a product signal, accumulating the value of the product signal in each clock to generate a quotient summation signal, determining the phase change of the input wobble signal according to the value of the quotient summation to generate a phase change signal, and generating the ADIP unit signal by comparing the phase change signal with a plurality of ADIP patterns.

Abstract: A method for optical drive decoding of address in pre-groove (ADIP) data is provided to decode an input wobble signal to an ADIP unit signal. The method includes generating a wobble carrier frequency signal having the same phase with the wobble signal, multiplying the wobble carrier frequency signal by the input wobble signal to generate a product signal, accumulating the value of the product signal in each clock to generate a quotient summation signal, determining the phase change of the input wobble signal according to the value of the quotient summation to generate a phase change signal, and generating the ADIP unit signal by comparing the phase change signal with a plurality of ADIP patterns.

Abstract: A method for optical drive decoding of address in pre-groove (ADIP) data is provided to decode an input wobble signal to an ADIP unit signal. The method includes generating a wobble carrier frequency signal having the same phase with the wobble signal, multiplying the wobble carrier frequency signal by the input wobble signal to generate a product signal, accumulating the value of the product signal in each clock to generate a quotient summation signal, determining the phase change of the input wobble signal according to the value of the quotient summation to generate a phase change signal, and generating the ADIP unit signal by comparing the phase change signal with a plurality of ADIP patterns.

Abstract: An optical disc system for recording data includes an optical pickup unit for accessing data on the disc rotating at a constant angular velocity and producing a wobble signal; a spindle motor for rotating the disc according to a control signal; a circuit for generating the control signal according to a rotation speed of the spindle motor, the circuit not being coupled to the wobble signal; a phase locked loop for extracting a carrier frequency of the wobble signal; a clock synthesizer for producing a channel clock corresponding to a linear velocity, according to the wobble signal carrier frequency; an encoding unit for encoding incoming data utilizing the channel clock, and then for producing a corresponding data signal for driving the optical pickup unit to record data to the optical disc; whereby data recording does not need to be synchronized with the spindle motor operation.

Abstract: A method for optical drive decoding of address in pre-groove (ADIP) data is provided to decode an input wobble signal to an ADIP unit signal. The method includes generating a wobble carrier frequency signal having the same phase with the wobble signal, multiplying the wobble carrier frequency signal by the input wobble signal to generate a product signal, accumulating the value of the product signal in each clock to generate a quotient summation signal, determining the phase change of the input wobble signal according to the value of the quotient summation to generate a phase change signal, and generating the ADIP unit signal by comparing the phase change signal with a plurality of ADIP patterns.

Abstract: An optical disc system for recoding data onto an optical disc while the optical disc is rotating at a constant angular velocity. The optical disc system includes a PLL for extracting a carrier frequency of a wobble signal outputted from an optical pick-up, a channel synthesizer electrically connected to the PLL for generating a channel clock according to the carrier frequency and a rotating factor of a spindle motor, a data encoder for encoding inputted data according to the channel clock, and a driving circuit for controlling the optical pick-up to record data onto the optical disc according to the encoded data.

Abstract: The long seek control system and method include a reference velocity mapping unit that obtains a reference velocity when the dual actuator is moved by the residual track count; a velocity estimator for outputting an estimated velocity and obtaining a sled control effort by subtracting the estimated velocity from the reference velocity; and an electrical damper for receiving the sled control effort and simultaneously receiving the displacement of the dual actuator to output a damping control effort to the fine actuator, and reduce the vibration of the fine actuator during the long seek operation. In the reference velocity mapping unit, a reference velocity curve is used to describe the mapping relation between the residual track count and the reference velocity. The reference velocity curve includes a linear part and several quadratic parts with different quadratic functions.

Abstract: The long seek control system and method include a reference velocity mapping unit that obtains a reference velocity when the dual actuator is moved by the residual track count; a velocity estimator for outputting an estimated velocity and obtaining a sled control effort by subtracting the estimated velocity from the reference velocity; and an electrical damper for receiving the sled control effort and simultaneously receiving the displacement of the dual actuator to output a damping control effort to the fine actuator, and reduce the vibration of the fine actuator during the long seek operation. In the reference velocity mapping unit, a reference velocity curve is used to describe the mapping relation between the residual track count and the reference velocity. The reference velocity curve includes a linear part and several quadratic parts with different quadratic functions.