Method for dynamically adjusting header region RF gain while accessing header regions of DVD-RAM disc and apparatus thereof
AssigneeMediatek Incorporation
InventorsChia-Wei Liang, Hsueh-Wu Kao
Life of this patent
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Abstract
A method for dynamically adjusting a header region RF gain of a variable gain amplifier while accessing header regions of a DVD-RAM disc, and apparatus thereof. The method includes the following steps: irradiating a light spot on the DVD-RAM disc with a pickup head; detecting a 4T peak-to-peak level of a RF signal generated by the variable gain amplifier while the light spot is moving within a VFO1 column of a header region of the DVD-RAM disc; comparing the 4T peak-to-peak level with a target level; adjusting a header region RF gain of the variable gain amplifier according to a result of the comparing step.
Claims13
A method for accessing header regions of a DVD-RAM disc, comprising:
- irradiating a light spot on the DVD-RAM disc with a pick up head;
- detecting a peak-to-peak level of a 4T RF signal generated by a variable gain amplifier when the light spot is moving within a VFO1 column of a header region of the DVD-RAM disc;
- comparing the detected peak-to-peak level with a target level;
- and
- adjusting a RF gain of the variable gain amplifier according to a result of the comparing step;
- wherein the variable gain amplifier is electrically connected to the pickup head for amplifying a RF signal outputted by the pickup head with the RF gain and generating the 4T RF signal accordingly.
A RF gain adjusting apparatus of an optical disc drive, the optical disc drive comprising a pickup head for irradiating a light spot onto a DVD-RAM disc, the RF gain adjusting apparatus comprising:
- a variable gain amplifier electrically connected to the pickup head, for amplifying a RF signal received from the pickup head with a RF gain when the light spot is moving within header regions of the DVD-RAM disc;
- a header region peak-to-peak detector electrically connected to the variable gain amplifier, for detecting a header region peak-to-peak level of an amplified RF signal generated by the variable gain amplifier when the light spot is moving within a VFO1 column of a header region of the DVD-RAM disc;
- and
- a feedback circuit electrically connected to the header region peak-to-peak detector and the variable gain amplifier, for comparing the header region peak-to-peak level with a header region target level and adjusting the RF gain accordingly.
A RF gain adjusting apparatus of an optical disc drive, the optical disc drive comprising a pickup head for irradiating a light spot onto a DVD-RAM disc, the RF gain adjusting apparatus comprising:
- a variable gain amplifier electrically connected to the pickup head, for amplifying a header region RF signal received from the pickup head with a header region RF gain when the light spot is moving within a header region of the DVD-RAM disc, and for amplifying a recording region RF signal received from the pickup head with a recording region RF gain when the light spot is moving within a recording region of the DVD-RAM disc;
- a header region 4T peak-to-peak detector electrically connected to the variable gain amplifier, for detecting a header region peak-to-peak level of an amplified header region RF signal generated by the variable gain amplifier when the light spot is moving within a VFO1 column of the header region;
- a recording region long-T peak-to-peak detector electrically connected to the variable gain amplifier, for detecting a recording region peak-to-peak level of an amplified recording region RF signal generated by the variable gain amplifier when the light spot is moving within the recording region;
- and
- a feedback circuit electrically connected to the header region 4T peak-to-peak detector, the recording region long-T peak-to-peak detector, and the variable gain amplifier, for comparing the header region peak-to-peak level with a header region target level and adjusting the header region RF gain accordingly, and for comparing the recording region peak-to-peak level with a recording region target level and adjusting the recording region RF gain accordingly.
Dependencies are inferred from the claim text.