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US 7,599,270 B2Granted
Optical disc storage systems and methods utilizing frequency predictive wobble signal detection
AssigneeSamsung Electronics Co., Ltd.
InventorWoo-Kang Jin
Life of this patent
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Abstract
A wobble signal for an optical storage device is generated by adjusting a center frequency (ω0) of a band pass filter based on an expected frequency of the wobble signal and/or an estimated position of a pick-up apparatus and filtering an input signal corresponding to the wobble signal from the pick-up apparatus with the adjusted band pass filter to provide the wobble signal. Adjusting the center frequency (ω0) of the band pass filter may also be based on a measured phase change of the band pass filter. Systems for generating a wobble signal, wobble signal detection circuits and optical storage devices are also provided.
Claims56
A system for generating a wobble signal from an optical disc, comprising:
- a system controller configured to generate a reference frequency control signal corresponding to an expected frequency of a wobble signal read from the optical disc;
- and
- a wobble signal detection circuit configured to adjust a center frequency (ω0) of a band pass filter responsive to the reference frequency control signal and a phase change control signal corresponding to a detected phase change of the band pass filter, receive an input signal corresponding to the wobble signal read from the optical disc and band pass filter the input signal utilizing the adjusted center frequency to provide an output wobble signal;
- and
- wherein the band pass filter comprises a plurality of serially connected band pass filters that respectively have an adjustable center frequency responsive to a target frequency control signal;
- and
- wherein the target frequency control signal is generated by combining the reference frequency control signal and the phase change control signal.
4 more elements
A system for generating a wobble signal from an optical disc, comprising:
- a system controller configured to generate a reference frequency control voltage corresponding to an expected frequency of a wobble signal read from the optical disc;
- and
- a wobble signal detection circuit responsive to the reference frequency control voltage, said wobble signal detection circuit configured to receive an input signal corresponding to the wobble signal read from the optical disc and band pass filter the input signal to provide an output wobble signal, said wobble signal detection circuit comprising:
- a band pass filter having an adjustable center frequency (ω0) responsive to a target frequency control voltage, said band pass filter comprising a plurality of serially connected band pass filters, each having an adjustable center frequency responsive to the target frequency control voltage;
- and
- a frequency calibration control unit configured to combine the reference frequency control voltage and a phase change control voltage corresponding to a measured phase change of the band pass filter to provide the target frequency control voltage.
3 more elements
A method of generating a wobble signal for an optical storage device, comprising:
- generating a wobble signal by filtering an input signal derived from information received from the optical storage device using a plurality of serially connected band pass filters that respectively have adjustable center frequencies;
- and
- adjusting the center frequencies of the plurality of serially connected band pass filters in response to a target frequency control signal generated by combining a reference frequency control signal corresponding to an expected frequency of the wobble signal and a phase change control signal corresponding to a detected phase change of the plurality of serially connected band pass filters;
- and
- filtering an input signal corresponding to the wobble signal with the adjusted band pass filter to provide the wobble signal.
2 more elements
A wobble detection circuit for generating a wobble signal for an optical storage device, comprising:
- a band pass filter having an adjustable center frequency (ω0) responsive to a target frequency control voltage;
- and
- a frequency calibration control unit configured to combine a reference frequency control voltage corresponding to an expected frequency of a wobble signal and a phase change control voltage corresponding to a detected phase change of the band pass filter to provide the target frequency control voltage;
- wherein the band pass filter comprises a plurality of serially connected band pass filters, each having an adjustable center frequency responsive to the target frequency control voltage.
1 more element
A wobble detection circuit for generating a wobble signal for an optical storage device, comprising:
- a band pass filter having an adjustable center frequency (ω0) responsive to a target frequency control voltage;
- and
- a frequency calibration control unit configured to combine a reference frequency control voltage corresponding to an expected frequency of a wobble signal and a phase change control voltage corresponding to a detected phase change of the band pass filter to provide the target frequency control voltage;
- wherein the frequency calibration control unit comprises:
- a phase detection circuit coupled between an input and an output of one of the serially connected band pass filters;
- a charge pump responsive to the phase change detection circuit and configured to output a current based on the output of the phase detection circuit;
- a loop filter having an input coupled to the charge pump and an output corresponding to the filtered output of the charge pump;
- a band pass filter control voltage generator configured to receive the output of the loop filter and the reference frequency control voltage and output the target frequency control voltage to each of the serially connected band pass filters.
5 more elements
A system for generating a wobble signal for an optical storage device, comprising:
- an adjustable center frequency (ω0) band pass filter configured to filter an input signal corresponding to the wobble signal to provide the wobble signal, said band pass filter comprising a plurality of serially connected band pass filters that respectively have an adjustable center frequency responsive to a target frequency control signal;
- and
- means for adjusting the center frequency (ω0) of the band pass filter based on an expected frequency of the wobble signal, said adjusting means comprising means for generating the target frequency control signal by combining a reference frequency control signal corresponding to an expected frequency of the wobble signal and a phase change control signal corresponding to a detected phase change of the band pass filter.
A system for generating a wobble signal from an optical disc, comprising:
- a system controller configured to generate a reference frequency control signal corresponding to an estimated position with respect to the optical disc of an optical pick-up apparatus that generates an input signal corresponding to the wobble signal read from the optical disc;
- and
- a wobble signal detection circuit configured to adjust a center frequency (ω0) of a band pass filter responsive to the reference frequency control signal and a phase change control signal corresponding to a detected phase change of the band pass filter, receive the input signal and band pass filter the input signal utilizing the adjusted center frequency to provide an output wobble signal, said band pass filter comprising a plurality of serially connected band pass filters that respectively have an adjustable center frequency responsive to a target frequency control signal generated by combining the reference frequency control signal and the phase change control signal.
A method of generating a wobble signal for an optical storage device, comprising:
- adjusting a center frequency (ω0) of a band pass filter based on an estimated position of an optical pick-up apparatus of the optical storage device, said band pass filter comprising a plurality of serially connected band pass filters that respectively have an adjustable center frequency responsive to a target frequency control signal generated by combining a reference frequency control signal corresponding to an expected frequency of the wobble signal and a phase change control signal corresponding to a phase change of the band pass filter;
- and
- filtering an input signal corresponding to the wobble signal from the pick-up apparatus with the adjusted band pass filter to provide the wobble signal.
Dependencies are inferred from the claim text.