METHOD AND RELATED APPARATUS FOR DERIVING A TRACKING ERROR SIGNAL
First Claim
1. A method for deriving a tracking error signal based on a first analog detection signal and a second analog detection signal, the method comprising:
- summing the first analog detection signal and the second analog detection signal to generate an analog sum signal;
utilizing an analog delay device to delay the analog sum signal into a delay signal;
digitalizing the delay signal into a digital delay signal;
transforming the first analog detection signal and the second analog detection signal respectively into a first digital detection signal and a second digital detect signal; and
respectively comparing the digital delay signal with the first digital detection signal and comparing the digital delay signal with the second digital detection signal to generate the tracking error signal.
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Abstract
A method for deriving a tracking error signal based on a first analog detection signal and a second analog detection signal. The method includes summing the first analog detection signal and the second analog detection signal to generate an analog sum signal. An analog delay device is utilized to delay the analog sum signal to be a delay signal. The delay signal is digitalized into a digital delay signal. The first analog detection signal and the second analog detection signal are respectively transformed into a first digital detection signal and a second digital detect signal. The tracking error signal is then generated utilizing a comparing operation among the digital delay signal, the first digital detect signal, and the first digital detect signal.
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Citations
27 Claims
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1. A method for deriving a tracking error signal based on a first analog detection signal and a second analog detection signal, the method comprising:
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summing the first analog detection signal and the second analog detection signal to generate an analog sum signal;
utilizing an analog delay device to delay the analog sum signal into a delay signal;
digitalizing the delay signal into a digital delay signal;
transforming the first analog detection signal and the second analog detection signal respectively into a first digital detection signal and a second digital detect signal; and
respectively comparing the digital delay signal with the first digital detection signal and comparing the digital delay signal with the second digital detection signal to generate the tracking error signal. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for deriving a tracking error signal in an optical storage system comprising:
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(a) receiving an optical beam reflected and refracted via a recording carrier, the optical beam propagating along a track direction on the recording carrier according to the tracking error signal;
(b) after proceeding with step(a), according to a plurality of received different portions of the optical beam in space, generating a first analog detection signal and a second analog detection signal, wherein there is a time difference between the first analog detection signal and the second analog detection signal;
(c) after proceeding with step(b), respectively transforming the first analog detection signal and the second analog detection signal into a first digital detection signal and a second digital detect signal;
(d) after proceeding with step(b), summing the first analog detection signal and the second analog detection signal to generate an analog sum signal;
(e) after proceeding with step(d), applying a delay operation to the analog sum signal to be a delay signal;
(f) after proceeding with step(e), digitalizing the delay signal into a digital delay signal; and
(g) after proceeding with step(e) and step(f), respectively comparing the digital delay signal with the first digital detection signal and comparing the digital delay signal with the second digital detection signal to generate the tracking error signal. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A tracking error signal generator used in an optical storage system for generating a tracking error signal comprising:
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two signal processing ports for respectively providing a first analog detection signal and a second analog detection signal, wherein there is a time difference between the first analog detection signal and the second analog detection signal;
a synthesizer electrically connected to the two signal processing ports for synthesizing the first analog detection signal and the second analog detection signal into an analog sum signal;
an analog delay device electrically connected to the synthesizer for delaying and digitalizing the analog sum signal into a digital delay signal;
two digitizers respectively electrically connected to the two signal processing ports for respectively transforming the first analog detection signal and the second analog detection signal into a first digital detection signal and a second digital detect signal; and
a comparing module electrically connected to the analog delay device and the two digitizers for respectively comparing the digital delay signal with the first digital detection signal and comparing the digital delay signal with the second digital detection signal to generate the tracking error signal. - View Dependent Claims (18, 19, 20, 21, 22, 23)
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24. A tracking error signal generator comprising:
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four signal processing ports for respectively providing a first analog detection signal, a second analog detection signal, a third analog detection signal, and a fourth analog detection signal;
a synthesizer electrically connected to the four signal processing ports for synthesizing the first analog detection signal, the second analog detection signal, the third analog detection signal, and the fourth analog detection signal into an analog summing signal;
an analog delay device electrically connected to the synthesizer for delaying and digitalizing the analog summing signal into a digital delay summing signal;
four digitizers respectively electrically connected to the four signal processing ports for respectively transforming the first analog detection signal, the second analog detection signal, the third analog detection signal, and the fourth analog detection signal into a first digital detect signal, a second digital detect signal, a third digital detect signal, and a fourth digital detect signal; and
a comparing module electrically connected to the analog delay device and the four digitizers for applying a comparing operation to the digital delay summing signal respectively with the first digital detect signal, the second digital detect signal, the third digital detect signal, and the fourth digital detection signal to generate the tracking error signal. - View Dependent Claims (25, 26, 27)
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Specification