| 摘要 |
A device for recording and/or reproducing an optical record carrier ( 1 ), comprises an optical system for projecting a first, a second and a third optical beam at a first ( 11 ), a second ( 12 ) and a third spot ( 13 ) at the record carrier ( 1 ). The device further comprises detection elements primary position signals (D 5 , C, D 1 ) which is indicative for an amount of radiation reflected by the record carrier at said thoses spots ( 11 ). The device further comprises signal processing means ( 34.1, . . . 34.4; 35.1, . . . 35.4 ) for generating a plurality of secondary position signals (S 1 , S 2 , S 3 , S 4 ) in response to the primary position signals (D 5 , C, D 1 ). A selection element ( 36 ) selects one of the position signals (S 1 , S 2 , D 1 , S 3 , S 4 ) as an output signal (WRE) in response to a selection signal (SEL). The selection signal (SEL) is derived from the output signal (WRE) of the selection element ( 36 ).
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