| 摘要 |
The invention relates to an apparatus for reproducing information from a record carrier. The apparatus comprises a read head (6) for reading marks representing the information from a track on the disc shaped record carrier (4). Further, an A/D converter (12, 34) is available for A/D converting the read signal with a specific clock frequency (fs), in response to a control signal (cs1). A bit recovery unit (130) is provided having an input coupled to the A/D conversion means, which bit recovery unit is adapted to retrieve a sequence of bits from the signal applied to its input, with a specific bit frequency (fb). A generator unit for deriving said control signal, as well as a generator for deriving said specific bit frequency is available. The generator unit for deriving said control signal comprises means (132; 134, 84) for deriving from the read signal the control signal which is indicative of the relative velocity of the read head with reference to the marks, so as to generate such specific clock frequency (fs) that roughly N samples per bit are supplied by the A/D conversion means (12, 34), irrespective of the relative velocity of the said at least one read head with reference to said marks. |
