APPARATUS AND METHOD FOR GENERATING A TRACKING ERROR SIGNAL IN AN OPTICAL DISC DRIVE
First Claim
1. An apparatus for generating a tracking error signal in an optical disc drive, the apparatus comprising:
- an optical detection module for generating a first analog signal and a second analog signal according to at least one reflection signal;
an ADC (Analog-to-digital) module coupled to the optical detection module for respectively sampling the first and second analog signals in a first sampling time to generate a first digital value and a second digital value, and respectively sampling the first and second analog signals in a second sampling time to generate a third digital value and a fourth digital value;
a phase detection module coupled to the ADC module for calculating a digital phase difference value according to the first, second, third and fourth digital values, wherein the digital phase difference value corresponds to an analog phase difference of the first and second analog signals; and
a first filter module coupled to the phase detection module for generating the tracking error signal according to the digital phase difference.
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Abstract
The present invention discloses an apparatus and method for generating a tracking error signal in an optical disc drive. The apparatus contains an optical detection module, an ADC module, a phase detection module, and a filter module. The optical detection module generates a first analog signal and a second analog signal. The ADC module samples the first and second signals in a first sampling time to generate a first digital value and a second digital value, and samples the first and second signals in a second sampling time to generate a third digital value and a fourth digital value. The phase detection module generates a digital phase difference value according to the first, the second, the third, and the fourth digital values. The filter module generates the tracking error signal according to the digital phase difference value.
29 Citations
23 Claims
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1. An apparatus for generating a tracking error signal in an optical disc drive, the apparatus comprising:
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an optical detection module for generating a first analog signal and a second analog signal according to at least one reflection signal;
an ADC (Analog-to-digital) module coupled to the optical detection module for respectively sampling the first and second analog signals in a first sampling time to generate a first digital value and a second digital value, and respectively sampling the first and second analog signals in a second sampling time to generate a third digital value and a fourth digital value;
a phase detection module coupled to the ADC module for calculating a digital phase difference value according to the first, second, third and fourth digital values, wherein the digital phase difference value corresponds to an analog phase difference of the first and second analog signals; and
a first filter module coupled to the phase detection module for generating the tracking error signal according to the digital phase difference. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for generating a tracking error signal in an optical disc drive, the method comprising the following steps:
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generating a first analog signal and a second analog signal according to at least one reflection signal;
converting the first and second analog signals into a first digital value and a second digital value respectively in a first sampling time;
converting the first and second analog signals into a third digital value and a fourth digital value respectively in a second sampling time;
calculating a digital phase difference value according to the first, second, third and fourth digital values, wherein the digital phase difference value corresponds to an analog phase difference of the first and second analog signals; and
generating a tracking error signal according to the digital phase difference. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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21. An apparatus for generating a tracking error signal in an optical disc drive, the apparatus comprising:
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an optical detection module for generating a first analog signal and a second analog signal according to at least one reflection signal;
an multi-bit ADC (Analog-to-digital) module coupled to the optical detection module for generating a first digital signal and a second digital signal;
a phase detection module coupled to the ADC module for calculating a digital phase difference value according to the first digital signal and the second digital signal in a first sampling time and a second sampling time; and
a first filter module coupled to the phase detection module for generating the tracking error signal according to the digital phase difference. - View Dependent Claims (22)
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23. A method for generating a tracking error signal in an optical disc drive, the method comprising the following steps:
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generating a first analog signal and a second analog signal according to at least one reflection signal;
converting the first and second analog signals into a first digital signal and a second digital signal, wherein the first and second digital signals are multi-level signals;
sampling respectively the first and second digital signals for generating a first digital value and a second digital value in a first sampling time;
sampling respectively the first and second analog signals for generating a third digital value and a fourth digital value in a second sampling time;
calculating a digital phase difference value according to the first, second, third and fourth digital values, wherein the digital phase difference value corresponds to an analog phase difference of the first and second analog signals; and
generating a tracking error signal according to the digital phase difference.
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Specification