Automatic gain control apparatus for optical disc player
First Claim
1. An automatic gain control apparatus for an optical disc player, equipped in a servo loop to perform a servo control by use of an error signal in the optical disc player, said apparatus comprising:
- a gain control means for controlling a gain of the servo loop to have a controlled gain value corresponding to a signal level of the error signal in one series of automatic gain controlling operation;
a memory for storing the controlled gain value as a previously controlled gain value in said one series of automatic gain controlling operation;
a comparison means for comparing the previously controlled gain value, which is stored in said memory, with a presently controlled gain value of the gain of the servo loop, which is presently controlled by said gain control means in another series of automatic gain controlling operation after said one series of automatic gain controlling operation; and
a controller for instructing said gain control means to control the gain of the servo loop again if a difference between the previously controlled gain value and the presently controlled gain value is not less than a predetermined value according to a comparison result of said comparison means in said another series of automatic gain controlling operation.
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Accused Products
Abstract
An automatic gain control apparatus for an optical disc player is equipped in a servo loop to perform a servo control by use of an error signal in the optical disc player. The apparatus is provided with: a gain control device for controlling a gain of the servo loop to have a controlled gain value corresponding to a signal level of the error signal in one series of automatic gain controlling operation; a memory for storing the controlled gain value as a previously controlled gain value in said one series of automatic gain controlling operation; a comparison device for comparing the previously controlled gain value, which is stored in the memory, with a presently controlled gain value of the gain of the servo loop, which is presently controlled by the gain control device in another series of automatic gain controlling operation after said one series of automatic gain controlling operation; and a controller for instructing the gain control device to control the gain of the servo loop again if a difference between the previously controlled gain value and the presently controlled gain value is not less than a predetermined value according to a comparison result of the comparison device in said another series of automatic gain controlling operation.
37 Citations
11 Claims
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1. An automatic gain control apparatus for an optical disc player, equipped in a servo loop to perform a servo control by use of an error signal in the optical disc player, said apparatus comprising:
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a gain control means for controlling a gain of the servo loop to have a controlled gain value corresponding to a signal level of the error signal in one series of automatic gain controlling operation; a memory for storing the controlled gain value as a previously controlled gain value in said one series of automatic gain controlling operation; a comparison means for comparing the previously controlled gain value, which is stored in said memory, with a presently controlled gain value of the gain of the servo loop, which is presently controlled by said gain control means in another series of automatic gain controlling operation after said one series of automatic gain controlling operation; and a controller for instructing said gain control means to control the gain of the servo loop again if a difference between the previously controlled gain value and the presently controlled gain value is not less than a predetermined value according to a comparison result of said comparison means in said another series of automatic gain controlling operation. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An automatic gain control apparatus for an optical disc player, equipped in servo loops to perform servo controls by use of at least two error signals in the optical disc player, said apparatus comprising:
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a gain control means for controlling gains of the servo loops to have controlled gain values corresponding to signal levels of the error signals respectively in one series of automatic gain controlling operation; a memory for storing the controlled gain values as previously controlled gain values respectively in said one series of automatic gain controlling operation; a comparison means for comparing a first difference between the previously controlled gain values, which are stored in said memory, with a second difference between presently controlled gain values of the gains of the servo loops, which are presently controlled by said gain control means in another series of automatic gain controlling operation after said one series of automatic gain controlling operation; and a controller for instructing said gain control means to control the gains of the servo loops again if a difference between the first difference and the second difference is not less than a predetermined value according to a comparison result of said comparison means in said another series of automatic gain controlling operation. - View Dependent Claims (9)
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10. An automatic gain control apparatus for an optical disc player, equipped in servo loops to perform servo controls by use of at least two error signals in the optical disc player, said apparatus comprising:
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a gain control means for controlling gains of the servo loops to have controlled gain values corresponding to signal levels of the error signals respectively in one series of automatic gain controlling operation; a comparison means for comparing the controlled gain values with each other in said one series of automatic gain controlling operation; and a controller for instructing said gain control means to control the gains of the servo loops again if a difference between the controlled gain values is not less than a predetermined value according to a comparison result of said comparison means in said one series of automatic gain controlling operation. - View Dependent Claims (11)
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Specification