Apparatus and method for generating a tracking error signal in an optical disc drive
First Claim
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1. An apparatus for generating a tracking error signal, the apparatus comprising:
- an optical sense module for generating a first analog signal and a second analog signal according to the signal reflected from an optical disc;
an ADC (Analog-to-Digital Converter) module coupled to the optical sense module for translating the first and second analog signals into a first and a second digital signals respectively;
a delay module coupled to the ADC module for delaying the first and second digital signals to generate a first and a second delay signals respectively; and
a signal generation module coupled to the ADC module and the delay module for generating the tracking error signal according to the first and second digital signals and the first and second delay signals, the signal generation module comprising;
a digital logic module for generating a first control signal and a second control signal according to the first and second digital signals and the first and second delay signals;
wherein the digital logic module generates the tracking error signal according to the first and the second control signals, and the digital logic module enables the first or the second control signal when a value of one of the first and second digital signals and the first and second delay signals is different from values of the others of the first and second digital signals and the first and second delay signals.
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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 method includes: receiving a first and a second analog signals; converting the first and the second analog signals into a first and a second digital signals respectively; delaying the first and second digital signals to generate a first and a second delay signals respectively; generating the tracking error signal according to the first and second digital signals and the first and second delay signals.
22 Citations
19 Claims
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1. An apparatus for generating a tracking error signal, the apparatus comprising:
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an optical sense module for generating a first analog signal and a second analog signal according to the signal reflected from an optical disc; an ADC (Analog-to-Digital Converter) module coupled to the optical sense module for translating the first and second analog signals into a first and a second digital signals respectively; a delay module coupled to the ADC module for delaying the first and second digital signals to generate a first and a second delay signals respectively; and a signal generation module coupled to the ADC module and the delay module for generating the tracking error signal according to the first and second digital signals and the first and second delay signals, the signal generation module comprising; a digital logic module for generating a first control signal and a second control signal according to the first and second digital signals and the first and second delay signals; wherein the digital logic module generates the tracking error signal according to the first and the second control signals, and the digital logic module enables the first or the second control signal when a value of one of the first and second digital signals and the first and second delay signals is different from values of the others of the first and second digital signals and the first and second delay signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for generating a tracking error signal, the method comprising the following steps:
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generating a first analog signal and a second analog signal according to the signals reflected from an optical disk; translating the first and second analog signals into a first and a second digital signals respectively; delaying the first and second digital signals to generate a first and a second delay signals respectively; generating a first and a second control signals according to the first and second digital signals and the first and second delay signals; and generating the tracking error signal according to the first and second control signals; wherein the first or the second control signal is enabled when a value of one of the first and second digital signals and the first and second delay signals is different from values of the others of the first and second digital signals and the first and second delay signals. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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Specification