| 摘要 |
A method is described for controlling an optical disc drive apparatus ( 1 ) of a type comprising: scanning means ( 30 ) for scanning a record track of an optical disc ( 2 ), said scanning means ( 30 ) comprising at least one read/write element ( 34 ) to be positioned with respect to the disc ( 2 ), and at least one optical detector ( 35 ) for generating a read signal (S<SUB>R</SUB>); actuator means ( 50 ) for controlling the positioning of said at least one read/write element ( 34 ); a control circuit ( 290 ) for receiving said read signal (S<SUB>R</SUB>) and generating at least one actuator control signal (S<SUB>CR</SUB>) on the basis of at least one signal component of said read signal (S<SUB>R</SUB>), the control circuit ( 290 ) having at least one variable gain (gamma); said control circuit ( 290 ), said actuator means ( 50 ), said read/write element ( 34 ), and said optical detector ( 35 ) defining a control loop ( 200 ) having a critical frequency (omega<SUB>CP</SUB>); the method comprises the steps of: selectively setting the gain (gamma), for signal components having a frequency in a predefined range corresponding to said critical frequency (omega<SUB>CP</SUB>), to a value lower than a value for signal components having a frequency outside said range.
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