Reproduction of an information signal from a record carrier

Details Reproduction of an information signal from a record carrier Reproduction of an information signal from a record carrier

1998-04-24

2000-08-22

Kim, W. Chris

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data clocking

360 65, G11B 509, G11B 5035

Patent

active

06108154&

ABSTRACT:
An apparatus for reproducing an information signal from a record carrier includes at least one read head (6,8) for reading the information signal from a track on the record carrier (4). Further, an A/D converter (12,34) is available for A/D converting the information signal read from the record carrier with a specific clock frequency (f.sub.s) in response to a first control signal (cs1). A bit detector unit (24) is provided having an input coupled to the A/D converter for retrieving a sequence of bits from the signal applied to its input, with a specific bit frequency (f.sub.b). A generator unit, for deriving the first control signal, as well as a generator for deriving the specific bit frequency, is available. The generator unit for deriving the first control signal includes a coarse control signal generator (48,60) for deriving a coarse control signal so as to generate such specific clock frequency (f.sub.s) that, roughly, N samples per bit are supplied by the A/D converter (12,34), irrespective of the relative velocity of the said at least one read head with reference to the said track, and a fine control signal generator (30,70,72) for deriving a fine control signal (cs3) so as to correct for the deviation of the specific clock frequency, expressed in number of samples per bit, from the value of N samples per bit, where N is a positive constant value.

REFERENCES:
patent: 5786853 (1998-07-01), Kalfs
patent: 5905601 (1999-05-01), Tsunoda
patent: 5909332 (1999-06-01), Spurbeck et al.
patent: 5978426 (1999-11-01), Glover et al.

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